// "Build Engine & Tools" Copyright (c) 1993-1997 Ken Silverman
// Ken Silverman's official web site: "http://www.advsys.net/ken"
// See the included license file "BUILDLIC.TXT" for license info.
//
// This file has been modified from Ken Silverman's original release
// by Jonathon Fowler (jf@jonof.id.au)


#define ENGINE

#if (PNG_LIBPNG_VER > 10599)
# include <string.h>
#endif
#include "compat.h"
#include "build.h"
#include "pragmas.h"
#include "cache1d.h"
#include "a.h"
#include "osd.h"
#include "crc32.h"
#include "quicklz.h"

#include "baselayer.h"
#include "scriptfile.h"

#ifdef USE_OPENGL
# include "glbuild.h"
# include "mdsprite.h"
# ifdef POLYMER
#  include "polymer.h"
# endif
# include "hightile.h"
# include "polymost.h"
# ifdef _WIN32
#  define WIN32_LEAN_AND_MEAN
#  include <windows.h>
# endif
#endif

#ifdef USE_LIBPNG
//# include <setjmp.h>
# include <png.h>
#endif

#include <math.h>  // pow

#include "engine_priv.h"

#ifdef LUNATIC
# include "lunatic.h"
L_State g_engState;
#endif

#define CACHEAGETIME 16
#define CLASSIC_NONPOW2_YSIZE_SPRITES

#ifdef LUNATIC
# define CLASSIC_NONPOW2_YSIZE_WALLS
#endif

#define HIGH_PRECISION_SPRITE
#define MULTI_COLUMN_VLINE
//#define DEBUG_TILESIZY_512
//#define DEBUG_TILEOFFSETS

#ifdef LUNATIC
# if !defined DEBUG_MAIN_ARRAYS
LUNATIC_EXTERN const int32_t engine_main_arrays_are_static = 0;  // for Lunatic
# else
LUNATIC_EXTERN const int32_t engine_main_arrays_are_static = 1;
# endif
#endif

#if MAXSECTORS==MAXSECTORSV8
LUNATIC_EXTERN const int32_t engine_v8 = 1;
#else
LUNATIC_EXTERN const int32_t engine_v8 = 0;
#endif

#ifdef DEBUGGINGAIDS
float debug1, debug2;
#endif

int32_t mapversion=7; // JBF 20040211: default mapversion to 7
int32_t g_loadedMapVersion = -1;  // -1: none (e.g. started new)

static int32_t get_mapversion(void);

// Handle nonpow2-ysize walls the old way?
static inline int32_t oldnonpow2(void)
{
#if !defined CLASSIC_NONPOW2_YSIZE_WALLS
    return 1;
#else
    return (g_loadedMapVersion < 10);
#endif
}

static void drawpixel_safe(void *s, char a)
{
#if defined __GNUC__
    if (__builtin_expect((intptr_t)s >= frameplace && (intptr_t)s < frameplace+bytesperline*ydim, 1))
#else
    if ((intptr_t)s >= frameplace && (intptr_t)s < frameplace+bytesperline*ydim)
#endif
        drawpixel(s, a);
#ifdef DEBUGGINGAIDS
    else
    {
        const char c = editorcolors[15];

        drawpixel((intptr_t *)frameplace, c);
        drawpixel((intptr_t *)frameplace+1, c);
        drawpixel((intptr_t *)frameplace+2, c);
        drawpixel((intptr_t *)frameplace+bytesperline, c);
        drawpixel((intptr_t *)frameplace+bytesperline+1, c);
        drawpixel((intptr_t *)frameplace+bytesperline+2, c);
        drawpixel((intptr_t *)frameplace+2*bytesperline, c);
        drawpixel((intptr_t *)frameplace+2*bytesperline+1, c);
        drawpixel((intptr_t *)frameplace+2*bytesperline+2, c);
    }
#endif
}

//void loadvoxel(int32_t voxindex) { UNREFERENCED_PARAMATER(voxindex); }
int16_t tiletovox[MAXTILES];
int32_t usevoxels = 1;
//#define kloadvoxel loadvoxel

int32_t novoxmips = 1;
int32_t editorgridextent = 131072;

//These variables need to be copied into BUILD
#define MAXXSIZ 256
#define MAXYSIZ 256
#define MAXZSIZ 255
#define MAXVOXMIPS 5
static intptr_t voxoff[MAXVOXELS][MAXVOXMIPS];
static char voxlock[MAXVOXELS][MAXVOXMIPS];
int32_t voxscale[MAXVOXELS];

static int32_t ggxinc[MAXXSIZ+1], ggyinc[MAXXSIZ+1];
static int32_t lowrecip[1024], nytooclose, nytoofar;
static uint32_t distrecip[65536+256];

static int32_t *lookups = NULL;
static int32_t dommxoverlay = 1, beforedrawrooms = 1;
int32_t indrawroomsandmasks = 0;

static int32_t oxdimen = -1, oviewingrange = -1, oxyaspect = -1;

// r_usenewaspect is the cvar, newaspect_enable to trigger the new behaviour in the code
int32_t r_usenewaspect = 1, newaspect_enable=0;
uint32_t r_screenxy = 0;

int32_t curbrightness = 0, gammabrightness = 0;

double vid_gamma = DEFAULT_GAMMA;
double vid_contrast = DEFAULT_CONTRAST;
double vid_brightness = DEFAULT_BRIGHTNESS;

//Textured Map variables
static char globalpolytype;
static int16_t *dotp1[MAXYDIM], *dotp2[MAXYDIM];

static int8_t tempbuf[MAXWALLS];

// referenced from asm
#ifdef __cplusplus
extern "C" {
#endif
int32_t ebpbak, espbak;
int32_t reciptable[2048], fpuasm;
intptr_t asm1, asm2, asm3, asm4, palookupoffse[4];
uint32_t vplce[4];
int32_t vince[4];
intptr_t bufplce[4];
int32_t globaltilesizy;
int32_t globalx1, globaly2, globalx3, globaly3;
#ifdef __cplusplus
};
#endif

static intptr_t slopalookup[16384];    // was 2048
#if defined(USE_OPENGL)
palette_t palookupfog[MAXPALOOKUPS];
#endif

static int32_t artversion;
static void *pic = NULL;
static char tilefilenum[MAXTILES];
static int32_t tilefileoffs[MAXTILES];
static int32_t lastageclock;

static int32_t artsize = 0, cachesize = 0;

// Whole ART file contents loaded from ZIPs in memory.
static char *artptrs[MAXTILEFILES];

static int32_t no_radarang2 = 0;
static int16_t radarang[1280], radarang2[MAXXDIM];

uint16_t ATTRIBUTE((used)) sqrtable[4096], ATTRIBUTE((used)) shlookup[4096+256];
const char pow2char[8] = {1,2,4,8,16,32,64,128};
const int32_t pow2long[32] =
{
    1, 2, 4, 8,
    16, 32, 64, 128,
    256, 512, 1024, 2048,
    4096, 8192, 16384, 32768,
    65536, 131072, 262144, 524288,
    1048576, 2097152, 4194304, 8388608,
    16777216, 33554432, 67108864, 134217728,
    268435456, 536870912, 1073741824, 2147483647
};

char britable[16][256]; // JBF 20040207: full 8bit precision

extern char textfont[2048], smalltextfont[2048];

static char kensmessage[128];
const char *engineerrstr = "No error";

int32_t showfirstwall=0;
int32_t showheightindicators=1;
int32_t circlewall=-1;

//char cachedebug = 0;

qlz_state_compress *state_compress = NULL;
qlz_state_decompress *state_decompress = NULL;

int32_t whitecol;

#ifdef POLYMER
static int16_t maphacklightcnt=0;
static int16_t maphacklight[PR_MAXLIGHTS];
#endif

// forward refs
int32_t getscreenvdisp(int32_t bz, int32_t zoome);
void screencoords(int32_t *xres, int32_t *yres, int32_t x, int32_t y, int32_t zoome);

static void scansector(int16_t sectnum);
static void draw_rainbow_background(void);

int16_t editstatus = 0;
static int32_t global100horiz;  // (-100..300)-scale horiz (the one passed to drawrooms)


////////// YAX //////////

int32_t numgraysects = 0;
uint8_t graysectbitmap[MAXSECTORS>>3];
uint8_t graywallbitmap[MAXWALLS>>3];
int32_t autogray = 0, showinnergray = 1;

//#define YAX_DEBUG_YMOSTS

#ifdef YAX_DEBUG
// XXX: This could be replaced with the use of gethiticks().
double u64tickspersec;
#endif
#ifdef ENGINE_SCREENSHOT_DEBUG
int32_t engine_screenshot = 0;
#endif

int32_t get_alwaysshowgray(void)
{
    return showinnergray || !(editorzrange[0]==INT32_MIN && editorzrange[1]==INT32_MAX);
}

void yax_updategrays(int32_t posze)
{
    int32_t i, j, k=1;
#ifdef YAX_ENABLE
    int32_t mingoodz=INT32_MAX, maxgoodz=INT32_MIN;
#else
    UNREFERENCED_PARAMETER(posze);
#endif

    Bmemset(graysectbitmap, 0, sizeof(graysectbitmap));
    Bmemset(graywallbitmap, 0, sizeof(graywallbitmap));

    for (i=0; i<numsectors; i++)
    {
#ifdef YAX_ENABLE
        int16_t cb, fb;

        yax_getbunches(i, &cb, &fb);
        // update grayouts due to yax  --v-- has to be half-open  --v--
        // because only one level should v  be ever active          v
        k = ((cb<0 || sector[i].ceilingz < posze) && (fb<0 || posze <= sector[i].floorz));
        if (autogray && (cb>=0 || fb>=0) && (sector[i].ceilingz <= posze && posze <= sector[i].floorz))
        {
            mingoodz = min(mingoodz, sector[i].ceilingz);
            maxgoodz = max(maxgoodz, sector[i].floorz);
        }
#endif
        // update grayouts due to editorzrange
        k &= (sector[i].ceilingz >= editorzrange[0] && sector[i].floorz <= editorzrange[1]);

        if (!k)  // outside bounds, gray out!
            graysectbitmap[i>>3] |= (1<<(i&7));
    }

#ifdef YAX_ENABLE
    if (autogray && mingoodz<=maxgoodz)
    {
        for (i=0; i<numsectors; i++)
            if (!(mingoodz <= sector[i].ceilingz && sector[i].floorz <= maxgoodz))
                graysectbitmap[i>>3] |= (1<<(i&7));
    }
#endif

    numgraysects = 0;
    for (i=0; i<numsectors; i++)
    {
        if (graysectbitmap[i>>3]&(1<<(i&7)))
        {
            numgraysects++;
            for (j=sector[i].wallptr; j<sector[i].wallptr+sector[i].wallnum; j++)
                graywallbitmap[j>>3] |= (1<<(j&7));
        }
    }
}


#if !defined YAX_ENABLE
# warning Non-TROR builds are supported only for debugging. Expect savegame breakage etc...
#endif

#ifdef YAX_ENABLE
// all references to floor/ceiling bunchnums should be through the
// get/set functions!

int32_t g_nodraw = 0;
int32_t scansector_retfast = 0;
static int32_t scansector_collectsprites = 1;
int32_t yax_globalcf = -1, yax_nomaskpass=0, yax_nomaskdidit;  // engine internal
int32_t r_tror_nomaskpass = 1;  // cvar
int32_t yax_globallev = YAX_MAXDRAWS;
int32_t yax_globalbunch = -1;

// duplicated tsprites
//  [i]:
//   i==MAXDRAWS: base level
//   i<MAXDRAWS: MAXDRAWS-i-1 is level towards ceiling
//   i>MAXDRAWS: i-MAXDRAWS-1 is level towards floor
static int16_t yax_spritesortcnt[1 + 2*YAX_MAXDRAWS];
static uint16_t yax_tsprite[1 + 2*YAX_MAXDRAWS][MAXSPRITESONSCREEN];
static uint8_t yax_tsprfrombunch[1 + 2*YAX_MAXDRAWS][MAXSPRITESONSCREEN];

// drawn sectors
uint8_t yax_gotsector[MAXSECTORS>>3];  // engine internal

# if !defined NEW_MAP_FORMAT
// Game-time YAX data structures, V7-V9 map formats.
int16_t yax_bunchnum[MAXSECTORS][2];
int16_t yax_nextwall[MAXWALLS][2];

static int32_t yax_islockededge(int32_t line, int32_t cf)
{
    return !!(wall[line].cstat&(YAX_NEXTWALLBIT(cf)));
}

#define YAX_PTRBUNCHNUM(Ptr, Sect, Cf) (*(&Ptr[Sect].ceilingxpanning + 8*Cf))
#define YAX_BUNCHNUM(Sect, Cf) YAX_PTRBUNCHNUM(sector, Sect, Cf)

//// bunch getters/setters
int16_t yax_getbunch(int16_t i, int16_t cf)
{
    if (editstatus==0)
        return yax_bunchnum[i][cf];

    if (((*(&sector[i].ceilingstat + cf))&YAX_BIT)==0)
        return -1;

    return YAX_BUNCHNUM(i, cf);
}

void yax_getbunches(int16_t i, int16_t *cb, int16_t *fb)
{
    *cb = yax_getbunch(i, YAX_CEILING);
    *fb = yax_getbunch(i, YAX_FLOOR);
}
# else
#  define YAX_PTRBUNCHNUM(Ptr, Sect, Cf) (*((Cf) ? &(Ptr)[Sect].floorbunch : &(Ptr)[Sect].ceilingbunch))
#  define YAX_BUNCHNUM(Sect, Cf) YAX_PTRBUNCHNUM(sector, Sect, Cf)

#  if !defined NEW_MAP_FORMAT
static int32_t yax_islockededge(int32_t line, int32_t cf)
{
    return (yax_getnextwall(line, cf) >= 0);
}
#  endif
# endif

// bunchnum: -1: also clear yax-nextwalls (forward and reverse)
//           -2: don't clear reverse yax-nextwalls
//           -3: don't clear either forward or reverse yax-nextwalls
void yax_setbunch(int16_t i, int16_t cf, int16_t bunchnum)
{
    if (editstatus==0)
    {
#ifdef NEW_MAP_FORMAT
        YAX_BUNCHNUM(i, cf) = bunchnum;
#else
        yax_bunchnum[i][cf] = bunchnum;
#endif
        return;
    }

    if (bunchnum < 0)
    {
        int32_t j;
        int16_t ynw;

        if (bunchnum > -3)
        {
            // TODO: for in-game too?
            for (j=sector[i].wallptr; j<sector[i].wallptr+sector[i].wallnum; j++)
            {
                ynw = yax_getnextwall(j, cf);
                if (ynw >= 0)
                {
                    if (bunchnum > -2)
                        yax_setnextwall(ynw, !cf, -1);
                    yax_setnextwall(j, cf, -1);
                }
            }
        }

#if !defined NEW_MAP_FORMAT
        *(&sector[i].ceilingstat + cf) &= ~YAX_BIT;
        YAX_BUNCHNUM(i, cf) = 0;
#else
        YAX_BUNCHNUM(i, cf) = -1;
#endif
        return;
    }

#if !defined NEW_MAP_FORMAT
    *(&sector[i].ceilingstat + cf) |= YAX_BIT;
#endif
    YAX_BUNCHNUM(i, cf) = bunchnum;
}

void yax_setbunches(int16_t i, int16_t cb, int16_t fb)
{
    yax_setbunch(i, YAX_CEILING, cb);
    yax_setbunch(i, YAX_FLOOR, fb);
}

# if !defined NEW_MAP_FORMAT
//// nextwall getters/setters
int16_t yax_getnextwall(int16_t wal, int16_t cf)
{
    if (editstatus==0)
        return yax_nextwall[wal][cf];

    if (!yax_islockededge(wal, cf))
        return -1;

    return YAX_NEXTWALL(wal, cf);
}

// unchecked!
void yax_setnextwall(int16_t wal, int16_t cf, int16_t thenextwall)
{
    if (editstatus==0)
    {
        yax_nextwall[wal][cf] = thenextwall;
        return;
    }

    if (thenextwall >= 0)
    {
        wall[wal].cstat |= YAX_NEXTWALLBIT(cf);
        YAX_NEXTWALL(wal, cf) = thenextwall;
    }
    else
    {
        wall[wal].cstat &= ~YAX_NEXTWALLBIT(cf);
        YAX_NEXTWALL(wal, cf) = YAX_NEXTWALLDEFAULT(cf);
    }
}
# endif

// make one step in the vertical direction, and if the wall we arrive at
// is red, return its nextsector.
int16_t yax_vnextsec(int16_t line, int16_t cf)
{
    int16_t ynw = yax_getnextwall(line, cf);

    if (ynw < 0)
        return -1;

    return wall[ynw].nextsector;
}


//// in-struct --> array transfer (only resetstat==0); list construction
// resetstat:  0: reset and read data from structs and construct linked lists etc.
//             1: only reset
//             2: read data from game-time arrays and construct linked lists etc.
void yax_update(int32_t resetstat)
{
    int32_t i;
#if !defined NEW_MAP_FORMAT
    int32_t j;
    const int32_t oeditstatus=editstatus;
#endif
    int16_t cb, fb;

    if (resetstat != 2)
        numyaxbunches = 0;

    for (i=0; i<MAXSECTORS; i++)
    {
#if !defined NEW_MAP_FORMAT
        if (resetstat != 2 || i>=numsectors)
            yax_bunchnum[i][0] = yax_bunchnum[i][1] = -1;
#endif
        nextsectbunch[0][i] = nextsectbunch[1][i] = -1;
    }
    for (i=0; i<YAX_MAXBUNCHES; i++)
        headsectbunch[0][i] = headsectbunch[1][i] = -1;
#if !defined NEW_MAP_FORMAT
    for (i=0; i<MAXWALLS; i++)
        if (resetstat != 2 || i>=numwalls)
            yax_nextwall[i][0] = yax_nextwall[i][1] = -1;
#endif

    if (resetstat==1)
        return;

    // Constuct singly linked list of sectors-of-bunch.

#if !defined NEW_MAP_FORMAT
    // Read bunchnums directly from the sector struct in yax_[gs]etbunch{es}!
    editstatus = (resetstat==0);
    // NOTE: Use oeditstatus to check for in-gamedness from here on!
#endif

    if (resetstat==0)
    {
        // make bunchnums consecutive
        uint8_t *const havebunch = (uint8_t *)tempbuf;
        uint8_t *const bunchmap = havebunch + (YAX_MAXBUNCHES>>3);
        int32_t dasub = 0;

        Bmemset(havebunch, 0, YAX_MAXBUNCHES>>3);
        for (i=0; i<numsectors; i++)
        {
            yax_getbunches(i, &cb, &fb);
            if (cb>=0)
                havebunch[cb>>3] |= (1<<(cb&7));
            if (fb>=0)
                havebunch[fb>>3] |= (1<<(fb&7));
        }

        for (i=0; i<YAX_MAXBUNCHES; i++)
        {
            if ((havebunch[i>>3]&(1<<(i&7)))==0)
            {
                bunchmap[i] = 255;
                dasub++;
                continue;
            }

            bunchmap[i] = i-dasub;
        }

        for (i=0; i<numsectors; i++)
        {
            yax_getbunches(i, &cb, &fb);
            if (cb>=0)
                yax_setbunch(i, YAX_CEILING, bunchmap[cb]);
            if (fb>=0)
                yax_setbunch(i, YAX_FLOOR, bunchmap[fb]);
        }
    }

    // In-struct --> array transfer (resetstat==0 and !defined NEW_MAP_FORMAT)
    // and list construction.
    for (i=numsectors-1; i>=0; i--)
    {
        yax_getbunches(i, &cb, &fb);
#if !defined NEW_MAP_FORMAT
        if (resetstat==0)
        {
            yax_bunchnum[i][0] = cb;
            yax_bunchnum[i][1] = fb;
        }
#endif

        if (cb >= 0)
        {
#if !defined NEW_MAP_FORMAT
            if (resetstat==0)
                for (j=sector[i].wallptr; j<sector[i].wallptr+sector[i].wallnum; j++)
                {
                    if (yax_islockededge(j,YAX_CEILING))
                    {
                        yax_nextwall[j][0] = YAX_NEXTWALL(j,0);
                        if (oeditstatus==0)
                            YAX_NEXTWALL(j,0) = 0;  // reset lotag!
                    }
                }
#endif
            if (headsectbunch[0][cb] == -1)
            {
                headsectbunch[0][cb] = i;
                // not duplicated in floors, since every extended ceiling
                // must have a corresponding floor:
                if (resetstat==0)
                    numyaxbunches++;
            }
            else
            {
                int32_t tmpsect = headsectbunch[0][cb];
                headsectbunch[0][cb] = i;
                nextsectbunch[0][i] = tmpsect;
            }
        }

        if (fb >= 0)
        {
#if !defined NEW_MAP_FORMAT
            if (resetstat==0)
                for (j=sector[i].wallptr; j<sector[i].wallptr+sector[i].wallnum; j++)
                {
                    if (yax_islockededge(j,YAX_FLOOR))
                    {
                        yax_nextwall[j][1] = YAX_NEXTWALL(j,1);
                        if (oeditstatus==0)
                            YAX_NEXTWALL(j,1) = -1;  // reset extra!
                    }
                }
#endif
            if (headsectbunch[1][fb] == -1)
                headsectbunch[1][fb] = i;
            else
            {
                int32_t tmpsect = headsectbunch[1][fb];
                headsectbunch[1][fb] = i;
                nextsectbunch[1][i] = tmpsect;
            }
        }
    }

#if !defined NEW_MAP_FORMAT
    editstatus = oeditstatus;
#else
    mapversion = (numyaxbunches>0) ? 10 : get_mapversion();
#endif
}

int32_t yax_getneighborsect(int32_t x, int32_t y, int32_t sectnum, int32_t cf)
{
    int16_t bunchnum = yax_getbunch(sectnum, cf);
    int32_t i;

    if (bunchnum < 0)
        return -1;

    for (SECTORS_OF_BUNCH(bunchnum, !cf, i))
        if (inside(x, y, i)==1)
            return i;

    return -1;
}

// indexed as a list:
static int16_t bunches[2][YAX_MAXBUNCHES];
// indexed with bunchnums directly:
static int16_t bunchsec[YAX_MAXBUNCHES], bunchdist[YAX_MAXBUNCHES];

static int32_t ymostallocsize = 0;  // numyaxbunches*xdimen (no sizeof(int16_t) here!)
static int16_t *yumost=NULL, *ydmost=NULL;  // used as if [numyaxbunches][xdimen]
uint8_t haveymost[YAX_MAXBUNCHES>>3];

// adapted from build.c
static void yax_getclosestpointonwall(int32_t dawall, int32_t *closestx, int32_t *closesty)
{
    int64_t i, j, wx,wy, wx2,wy2, dx, dy;

    wx = wall[dawall].x;
    wy = wall[dawall].y;
    wx2 = wall[wall[dawall].point2].x;
    wy2 = wall[wall[dawall].point2].y;

    dx = wx2 - wx;
    dy = wy2 - wy;
    i = dx*(globalposx-wx) + dy*(globalposy-wy);
    if (i <= 0) { *closestx = wx; *closesty = wy; return; }
    j = dx*dx + dy*dy;
    if (i >= j) { *closestx = wx2; *closesty = wy2; return; }
    i=((i<<15)/j)<<15;
    *closestx = wx + ((dx*i)>>30);
    *closesty = wy + ((dy*i)>>30);
}

static inline int32_t yax_walldist(int32_t w)
{
    int32_t closestx, closesty;

    yax_getclosestpointonwall(w, &closestx, &closesty);
    return klabs(closestx-globalposx) + klabs(closesty-globalposy);

//    return klabs(wall[w].x-globalposx) + klabs(wall[w].y-globalposy);
}

// calculate distances to bunches and best start-drawing sectors
static void yax_scanbunches(int32_t bbeg, int32_t numhere, const uint8_t *lastgotsector)
{
    int32_t bnchcnt, bunchnum, j, k;
    int32_t startwall, endwall;

    UNREFERENCED_PARAMETER(lastgotsector);

    scansector_retfast = 1;
    scansector_collectsprites = 0;

    for (bnchcnt=bbeg; bnchcnt<bbeg+numhere; bnchcnt++)
    {
        int32_t walldist, bestsec=-1;
        int32_t bestwalldist=INT32_MAX, bestbestdist=INT32_MAX;

        bunchnum = bunches[yax_globalcf][bnchcnt];

        for (SECTORS_OF_BUNCH(bunchnum,!yax_globalcf, k))
        {
            int32_t checkthisec = 0;

            if (inside(globalposx, globalposy, k)==1)
            {
                bestsec = k;
                bestbestdist = 0;
                break;
            }

            startwall = sector[k].wallptr;
            endwall = startwall+sector[k].wallnum;

            for (j=startwall; j<endwall; j++)
            {
/*
                if ((w=yax_getnextwall(j,!yax_globalcf))>=0)
                    if ((ns=wall[w].nextsector)>=0)
                        if ((lastgotsector[ns>>3]&(1<<(ns&7)))==0)
                            continue;
*/
                walldist = yax_walldist(j);
                if (walldist < bestwalldist)
                {
                    checkthisec = 1;
                    bestwalldist = walldist;
                }
            }

            if (checkthisec)
            {
                numscans = numbunches = 0;
                if (getrendermode() == REND_CLASSIC)
                    scansector(k);
#ifdef USE_OPENGL
                else
                    polymost_scansector(k);
#endif
                if (numbunches > 0)
                {
                    bestsec = k;
                    bestbestdist = bestwalldist;
                }
            }
        }

        bunchsec[bunchnum] = bestsec;
        bunchdist[bunchnum] = bestbestdist;
    }

    scansector_collectsprites = 1;
    scansector_retfast = 0;
}

static int yax_cmpbunches(const void *b1, const void *b2)
{
    return (bunchdist[*(int16_t *)b2] - bunchdist[*(int16_t *)b1]);
}


void yax_tweakpicnums(int32_t bunchnum, int32_t cf, int32_t restore)
{
    // for polymer, this is called before polymer_drawrooms() with restore==0
    // and after polymer_drawmasks() with restore==1

    int32_t i, dastat;
    static int16_t opicnum[2][MAXSECTORS];
#ifdef DEBUGGINGAIDS
    static uint8_t expect_restore[2][YAX_MAXBUNCHES];

    // must call this with restore == 0, 1,  0, 1,  0, 1,  ...
    Bassert(expect_restore[cf][bunchnum] == restore);
    expect_restore[cf][bunchnum] = !expect_restore[cf][bunchnum];
#endif

    for (SECTORS_OF_BUNCH(bunchnum, cf, i))
    {
        dastat = (SECTORFLD(i,stat, cf)&(128+256));

        // only consider non-masked ceilings/floors
        if (dastat==0 || (restore==1 && opicnum[cf][i]&0x8000))
        {
            if (!restore)
            {
                opicnum[cf][i] = SECTORFLD(i,picnum, cf);
                if (editstatus && showinvisibility)
                    SECTORFLD(i,picnum, cf) = MAXTILES-1;
                else //if ((dastat&(128+256))==0)
                    SECTORFLD(i,picnum, cf) = 13; //FOF;
            }
            else
            {
                SECTORFLD(i,picnum, cf) = opicnum[cf][i];
            }
#ifdef POLYMER
            // will be called only in editor
            if (getrendermode() == REND_POLYMER)
            {
                if (!restore)
                {
                    SECTORFLD(i,stat, cf) |= 128;
                    opicnum[cf][i] |= 0x8000;
                }
                else
                {
                    SECTORFLD(i,stat, cf) &= ~128;
                    SECTORFLD(i,picnum, cf) &= 0x7fff;
                    opicnum[cf][i] = 0;
                }
            }
#endif
        }
    }
}

static void yax_copytsprites()
{
    int32_t i, spritenum, gotthrough, sectnum;
    int32_t sortcnt = yax_spritesortcnt[yax_globallev];
    const spritetype *spr;

    for (i=0; i<sortcnt; i++)
    {
        spritenum = yax_tsprite[yax_globallev][i];

        gotthrough = spritenum&(MAXSPRITES|(MAXSPRITES<<1));

        spritenum &= MAXSPRITES-1;
        spr = &sprite[spritenum];
        sectnum = spr->sectnum;

        if (gotthrough == (MAXSPRITES|(MAXSPRITES<<1)))
        {
            if (yax_globalbunch != yax_tsprfrombunch[yax_globallev][i])
                continue;
        }
        else
        {
            int32_t cf = -1;

            if (gotthrough == MAXSPRITES)
                cf = YAX_CEILING;  // sprite got here through the ceiling of lower sector
            else if (gotthrough == (MAXSPRITES<<1))
                cf = YAX_FLOOR;  // sprite got here through the floor of upper sector

            if (cf != -1)
            {
                if ((yax_globallev-YAX_MAXDRAWS)*(-1 + 2*cf) > 0)
                    if (yax_getbunch(sectnum, cf) != yax_globalbunch)
                        continue;

                sectnum = yax_getneighborsect(spr->x, spr->y, sectnum, cf);
                if (sectnum < 0)
                    continue;
            }
        }

        if (spritesortcnt >= MAXSPRITESONSCREEN)
            break;

        Bmemcpy(&tsprite[spritesortcnt], spr, sizeof(spritetype));
        tsprite[spritesortcnt].owner = spritenum;

        tsprite[spritesortcnt].sectnum = sectnum;  // potentially tweak sectnum!
        spritesortcnt++;
    }
}


void yax_preparedrawrooms(void)
{
    if (getrendermode() == REND_POLYMER || numyaxbunches==0)
        return;

    g_nodraw = 1;
    Bmemset(yax_spritesortcnt, 0, sizeof(yax_spritesortcnt));
    Bmemset(haveymost, 0, (numyaxbunches+7)>>3);

    if (getrendermode() == REND_CLASSIC && ymostallocsize < xdimen*numyaxbunches)
    {
        ymostallocsize = xdimen*numyaxbunches;
        yumost = (int16_t *)Brealloc(yumost, ymostallocsize*sizeof(int16_t));
        ydmost = (int16_t *)Brealloc(ydmost, ymostallocsize*sizeof(int16_t));

        if (!yumost || !ydmost)
        {
            initprintf("OUT OF MEMORY in yax_preparedrawrooms!\n");
            uninitengine();
            exit(10);
        }
    }
}

void yax_drawrooms(void (*SpriteAnimFunc)(int32_t,int32_t,int32_t,int32_t),
                   int16_t sectnum, int32_t didmirror, int32_t smoothr)
{
    static uint8_t havebunch[YAX_MAXBUNCHES>>3];

    const int32_t horiz = global100horiz;

    int32_t i, j, k, lev, cf, nmp;
    int32_t bnchcnt, bnchnum[2] = {0,0}, maxlev[2];
    int16_t ourbunch[2] = {-1,-1}, osectnum=sectnum;
    int32_t bnchbeg[YAX_MAXDRAWS][2], bnchend[YAX_MAXDRAWS][2];
    int32_t bbeg, numhere;

    // original (1st-draw) and accumulated ('per-level') gotsector bitmaps
    static uint8_t ogotsector[MAXSECTORS>>3], lgotsector[MAXSECTORS>>3];
#ifdef YAX_DEBUG
    uint64_t t;
#endif

    if (getrendermode() == REND_POLYMER || numyaxbunches==0)
    {
#ifdef ENGINE_SCREENSHOT_DEBUG
        engine_screenshot = 0;
#endif
        return;
    }

    // if we're here, there was just a drawrooms() call with g_nodraw=1

    Bmemcpy(ogotsector, gotsector, (numsectors+7)>>3);

    if (sectnum >= 0)
        yax_getbunches(sectnum, &ourbunch[0], &ourbunch[1]);
    Bmemset(&havebunch, 0, (numyaxbunches+7)>>3);

    // first scan all bunches above, then all below...
    for (cf=0; cf<2; cf++)
    {
        yax_globalcf = cf;

        if (cf==1)
        {
            sectnum = osectnum;
            Bmemcpy(gotsector, ogotsector, (numsectors+7)>>3);
        }

        for (lev=0; /*lev<YAX_MAXDRAWS*/; lev++)
        {
            yax_globallev = YAX_MAXDRAWS + (-1 + 2*cf)*(lev+1);

            bbeg = bnchbeg[lev][cf] = bnchend[lev][cf] = bnchnum[cf];
            numhere = 0;

            for (i=0; i<numsectors; i++)
            {
                if (!(gotsector[i>>3]&(1<<(i&7))))
                    continue;

                j = yax_getbunch(i, cf);
                if (j >= 0 && !(havebunch[j>>3]&(1<<(j&7))))
                {
                    if (getrendermode() == REND_CLASSIC && (haveymost[j>>3]&(1<<(j&7)))==0)
                    {
                        yaxdebug("%s, l %d: skipped bunch %d (no *most)", cf?"v":"^", lev, j);
                        continue;
                    }

                    if ((SECTORFLD(i,stat, cf)&2) ||
                            (cf==0 && globalposz > sector[i].ceilingz) ||
                            (cf==1 && globalposz < sector[i].floorz))
                    {
                        havebunch[j>>3] |= (1<<(j&7));
                        bunches[cf][bnchnum[cf]++] = j;
                        bnchend[lev][cf]++;
                        numhere++;
                    }
                }
            }

            if (numhere > 0)
            {
                // found bunches -- need to fake-draw

                yax_scanbunches(bbeg, numhere, (uint8_t *)gotsector);

                qsort(&bunches[cf][bbeg], numhere, sizeof(int16_t), &yax_cmpbunches);

                if (numhere > 1 && lev != YAX_MAXDRAWS-1)
                    Bmemset(lgotsector, 0, (numsectors+7)>>3);

                for (bnchcnt=bbeg; bnchcnt < bbeg+numhere; bnchcnt++)
                {
                    j = bunches[cf][bnchcnt];  // the actual bunchnum...
                    yax_globalbunch = j;
#ifdef YAX_DEBUG
                    t=getu64ticks();
#endif
                    k = bunchsec[j];

                    if (k < 0)
                    {
                        yaxprintf("%s, l %d: skipped bunch %d\n", cf?"v":"^", lev, j);
                        continue;
                    }

                    if (lev != YAX_MAXDRAWS-1)
                    {
#ifdef YAX_DEBUG
                        int32_t odsprcnt = yax_spritesortcnt[yax_globallev];
#endif
                        // +MAXSECTORS: force
                        drawrooms(globalposx,globalposy,globalposz,globalang,horiz,k+MAXSECTORS);
                        if (numhere > 1)
                            for (i=0; i<(numsectors+7)>>3; i++)
                                lgotsector[i] |= gotsector[i];

                        yaxdebug("l%d: faked (bn %2d) sec %4d,%3d dspr, ob=[%2d,%2d], sn=%4d, %.3f ms",
                                 yax_globallev-YAX_MAXDRAWS, j, k, yax_spritesortcnt[yax_globallev]-odsprcnt,
                                 ourbunch[0],ourbunch[1],sectnum,
                                 (double)(1000*(getu64ticks()-t))/u64tickspersec);
                    }

                    if (ourbunch[cf]==j)
                    {
                        ourbunch[cf] = yax_getbunch(k, cf);
                        sectnum = k;
                    }
                }

                if (numhere > 1 && lev != YAX_MAXDRAWS-1)
                    Bmemcpy(gotsector, lgotsector, (numsectors+7)>>3);
            }

            if (numhere==0 || lev==YAX_MAXDRAWS-1)
            {
                // no new bunches or max level reached
                maxlev[cf] = lev - (numhere==0);
                break;
            }
        }
    }

//    yax_globalcf = -1;

    // now comes the real drawing!
    g_nodraw = 0;
    scansector_collectsprites = 0;

    if (editstatus==1)
    {
        if (getrendermode() == REND_CLASSIC)
        {
            begindrawing();
            draw_rainbow_background();
            enddrawing();
        }
#ifdef USE_OPENGL
        else
        {
            bglClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
        }
#endif
    }

    for (cf=0; cf<2; cf++)
    {
        yax_globalcf = cf;

        for (lev=maxlev[cf]; lev>=0; lev--)
        {
            yax_globallev = YAX_MAXDRAWS + (-1 + 2*cf)*(lev+1);
            scansector_collectsprites = (lev == YAX_MAXDRAWS-1);

            for (bnchcnt=bnchbeg[lev][cf]; bnchcnt<bnchend[lev][cf]; bnchcnt++)
            {
                j = bunches[cf][bnchcnt];  // the actual bunchnum...
                k = bunchsec[j];  // best start-drawing sector
                yax_globalbunch = j;
#ifdef YAX_DEBUG
                t=getu64ticks();
#endif
                yax_tweakpicnums(j, cf, 0);
                if (k < 0)
                    continue;

                yax_nomaskdidit = 0;
                for (nmp=r_tror_nomaskpass; nmp>=0; nmp--)
                {
                    yax_nomaskpass = nmp;
                    drawrooms(globalposx,globalposy,globalposz,globalang,horiz,k+MAXSECTORS);  // +MAXSECTORS: force

                    if (nmp==1)
                    {
                        yaxdebug("nm1 l%d: DRAWN (bn %2d) sec %4d,          %.3f ms",
                                 yax_globallev-YAX_MAXDRAWS, j, k,
                                 (double)(1000*(getu64ticks()-t))/u64tickspersec);

                        if (!yax_nomaskdidit)
                        {
                            yax_nomaskpass = 0;
                            break;  // no need to draw the same stuff twice
                        }
                        Bmemcpy(yax_gotsector, gotsector, (numsectors+7)>>3);
                    }
                }

                if (!scansector_collectsprites)
                    spritesortcnt = 0;
                yax_copytsprites();
                yaxdebug("nm0 l%d: DRAWN (bn %2d) sec %4d,%3d tspr, %.3f ms",
                         yax_globallev-YAX_MAXDRAWS, j, k, spritesortcnt,
                         (double)(1000*(getu64ticks()-t))/u64tickspersec);

                SpriteAnimFunc(globalposx, globalposy, globalang, smoothr);
                drawmasks();
            }

            if (lev < maxlev[cf])
                for (bnchcnt=bnchbeg[lev+1][cf]; bnchcnt<bnchend[lev+1][cf]; bnchcnt++)
                    yax_tweakpicnums(bunches[cf][bnchcnt], cf, 1);  // restore picnums
        }
    }

#ifdef YAX_DEBUG
    t=getu64ticks();
#endif
    yax_globalcf = -1;
    yax_globalbunch = -1;
    yax_globallev = YAX_MAXDRAWS;
    scansector_collectsprites = 0;

    // draw base level
    drawrooms(globalposx,globalposy,globalposz,globalang,horiz,
              osectnum + MAXSECTORS*didmirror);
//    if (scansector_collectsprites)
//        spritesortcnt = 0;
    yax_copytsprites();
    yaxdebug("DRAWN base level sec %d,%3d tspr, %.3f ms", osectnum,
             spritesortcnt, (double)(1000*(getu64ticks()-t))/u64tickspersec);
    scansector_collectsprites = 1;

    for (cf=0; cf<2; cf++)
        if (maxlev[cf] >= 0)
            for (bnchcnt=bnchbeg[0][cf]; bnchcnt<bnchend[0][cf]; bnchcnt++)
                yax_tweakpicnums(bunches[cf][bnchcnt], cf, 1);  // restore picnums

#ifdef ENGINE_SCREENSHOT_DEBUG
    engine_screenshot = 0;
#endif

#ifdef YAX_DEBUG_YMOSTS
    if (getrendermode() == REND_CLASSIC && numyaxbunches>0)
    {
        char purple = getclosestcol(63, 0, 63);
        char yellow = getclosestcol(63, 63, 0);

        begindrawing();
        for (i=0; i<numyaxbunches; i++)
        {
            int32_t x, x1;

            if ((haveymost[i>>3]&(1<<i&7))==0)
                continue;

            x1 = i*xdimen;

            for (x=x1; x<x1+xdimen; x++)
            {
                if (yumost[x] >= 0 && yumost[x] < ydim && (x&1))
                    *((char *)frameplace + yumost[x]*bytesperline + x-x1) = purple;

                if (ydmost[x]-1 >= 0 && ydmost[x]-1 < ydim && !(x&1))
                    *((char *)frameplace + (ydmost[x]-1)*bytesperline + x-x1) = yellow;
            }
        }
        enddrawing();
    }
#endif
}

#endif  // defined YAX_ENABLE

// must have writable frame buffer, i.e. done begindrawing()
static void draw_rainbow_background(void)
{
    int32_t y, i;
    const int32_t N = 240;  // don't use fullbright colors
    const int32_t numfull=bytesperline/N, numrest=bytesperline%N;

    const char *const src = palookup[0] + 256*18;
    char *dst = (char *)frameplace;

    for (y=0; y<ydim; y++)
    {
        for (i=0; i<numfull; i++)
            Bmemcpy(&dst[N*i], src, N);
        if (numrest > 0)
            Bmemcpy(&dst[N*i], src, numrest);

        dst += bytesperline;
    }
}

//
// setslope
//
void setslope(int32_t sectnum, int32_t cf, int16_t slope)
{
    if (slope==0)
    {
        SECTORFLD(sectnum,stat, cf) &= ~2;
        SECTORFLD(sectnum,heinum, cf) = 0;
    }
    else
    {
        SECTORFLD(sectnum,stat, cf) |= 2;
        SECTORFLD(sectnum,heinum, cf) = slope;
    }
}

////////// editor side view //////////
int32_t m32_sideview = 0;
int32_t m32_sideelev = 256;  // elevation in BUILD degrees, 0..512
int16_t m32_sideang = 200;  // azimuth, 0..2047

int32_t m32_sidecos, m32_sidesin;
int32_t m32_swcnt;
int32_t m32_wallscreenxy[MAXWALLS][2];
int16_t m32_wallsprite[MAXWALLS+MAXSPRITES];
static int32_t m32_sidedist[MAXWALLS+MAXSPRITES];
static vec3_t m32_viewplane;


////// sector-like clipping for sprites //////
#ifdef HAVE_CLIPSHAPE_FEATURE
typedef struct
{
    int16_t numsectors, numwalls;
    sectortype *sector;
    walltype *wall;
} mapinfo_t;

static void mapinfo_set(mapinfo_t *bak, mapinfo_t *newmap)
{
    if (bak)
    {
        bak->numsectors = numsectors;
        bak->numwalls = numwalls;
        bak->sector = sector;
        bak->wall = wall;
    }

    if (newmap)
    {
        numsectors = newmap->numsectors;
        numwalls = newmap->numwalls;
        sector = newmap->sector;
        wall = newmap->wall;
    }
}

static mapinfo_t origmapinfo, clipmapinfo;
static int32_t quickloadboard=0;


#define CM_MAX 256  // must be a power of 2

typedef struct
{
    int16_t qbeg, qend;  // indices into sectq
    int16_t picnum, next;
    int32_t maxdist;
} clipinfo_t;

static int32_t numclipmaps;
static clipinfo_t clipinfo[CM_MAX];

static int32_t numclipsects;  // number in sectq[]
static int16_t *sectoidx, *sectq;  // [numsectors]
static int16_t pictoidx[MAXTILES];  // maps tile num to clipinfo[] index
static int16_t *tempictoidx;

static sectortype *loadsector;
static walltype *loadwall, *loadwallinv;
static spritetype *loadsprite;

// sectoidx bits
#undef CM_NONE
#define CM_NONE (CM_MAX<<1)
#define CM_SOME (CM_NONE-1)
#define CM_OUTER (CM_MAX)   // sector surrounds clipping sector

// sprite -> sector tag mappings
#define CM_XREPEAT floorpal
#define CM_YREPEAT floorxpanning
#define CM_XOFFSET ceilingshade
#define CM_YOFFSET floorshade
#define CM_CSTAT hitag
#define CM_ANG extra
#define CM_FLOORZ(Sec) (*(int32_t *)&sector[Sec].ceilingxpanning)  // ceilingxpanning,ceilingypanning,floorpicnum
#define CM_CEILINGZ(Sec) (*(int32_t *)&sector[Sec].visibility)  // visibility,filler,lotag

// backup of original normalized coordinates
#define CM_WALL_X(Wal) (*(int32_t *)&wall[Wal].picnum)  // picnum, overpicnum
#define CM_WALL_Y(Wal) (*(int32_t *)&wall[Wal].lotag)  // lotag, hitag

// don't rotate when applying clipping, for models with rotational symmetry
#define CM_NOROT(Spri) (sprite[Spri].cstat&2)
#define CM_NOROTS(Sect) (sector[Sect].CM_CSTAT&2)


static void clipmapinfo_init()
{
    int32_t i;

    numclipmaps = 0;
    numclipsects = 0;

    if (sectq) { Bfree(sectq); sectq=NULL; }
    if (sectoidx) { Bfree(sectoidx); sectoidx=NULL; }
    if (tempictoidx) { Bfree(tempictoidx); tempictoidx=NULL; }

    for (i=0; i<MAXTILES; i++)
        pictoidx[i]=-1;

    if (loadsector) { Bfree(loadsector); loadsector=NULL; }
    if (loadwall) { Bfree(loadwall); loadwall=NULL; }
    if (loadwallinv) { Bfree(loadwallinv); loadwallinv=NULL; }
    if (loadsprite) { Bfree(loadsprite); loadsprite=NULL; }

    clipmapinfo.numsectors = clipmapinfo.numwalls = 0;
    clipmapinfo.sector=NULL;
    clipmapinfo.wall=NULL;

    numsectors = 0;
    numwalls = 0;
}

// loads the clip maps.
// this should be called before any real map is loaded.
int32_t clipmapinfo_load(void)
{
    int32_t i,k,w;

    int32_t lwcp = 0;
    int32_t fi;

    int32_t *fisec = NULL;
    int32_t *fispr = NULL;

    int32_t ournumsectors=0, ournumwalls=0, ournumsprites=0;

    clipmapinfo_init();

    loadsector = (sectortype *)Bmalloc(MAXSECTORS * sizeof(sectortype));
    loadwall = (walltype *)Bmalloc(MAXWALLS * sizeof(walltype));
    loadsprite = (spritetype *)Bmalloc(MAXSPRITES * sizeof(spritetype));

    if (!loadsector || !loadwall || !loadsprite)
    {
        clipmapinfo_init();
        return 1;
    }

    if (g_clipMapFilesNum)
        fisec = (int32_t *) Bcalloc(g_clipMapFilesNum, sizeof (int32_t));
    if (g_clipMapFilesNum)
        fispr = (int32_t *) Bcalloc(g_clipMapFilesNum, sizeof (int32_t));

    quickloadboard = 1;
    for (fi = 0; fi < g_clipMapFilesNum; ++fi)
    {
        int16_t ang,cs;
        vec3_t tmppos;

        fisec[fi] = ournumsectors;
        fispr[fi] = ournumsprites;

        i = loadboard(g_clipMapFiles[fi], 0, &tmppos, &ang, &cs);
        if (i<0)
            continue;
        // Numsprites will now be set!

        initprintf("Loading clip map: %s\n", g_clipMapFiles[fi]);

        if (ournumsectors+numsectors>MAXSECTORS ||
                ournumwalls+numwalls>MAXWALLS ||
                ournumsprites+Numsprites>MAXSPRITES)
        {
            initprintf("clip map: warning: exceeded limits when loading %s, aborting.\n", g_clipMapFiles[fi]);
            break;
        }

        Bmemcpy(loadsector+ournumsectors, sector, numsectors*sizeof(sectortype));
        Bmemcpy(loadwall+ournumwalls, wall, numwalls*sizeof(walltype));
        Bmemcpy(loadsprite+ournumsprites, sprite, Numsprites*sizeof(spritetype));
        for (i=ournumsectors; i<ournumsectors+numsectors; i++)
            loadsector[i].wallptr += ournumwalls;
        for (i=ournumwalls; i<ournumwalls+numwalls; i++)
        {
            if (loadwall[i].point2>=0)
                loadwall[i].point2 += ournumwalls;
            if (loadwall[i].nextwall>=0)
            {
                loadwall[i].nextwall += ournumwalls;
                loadwall[i].nextsector += ournumsectors;
            }
        }
        for (i=ournumsprites; i<ournumsprites+Numsprites; i++)
            if (loadsprite[i].sectnum>=0)
                loadsprite[i].sectnum += ournumsectors;
        ournumsectors += numsectors;
        ournumwalls += numwalls;
        ournumsprites += Numsprites;

        ++lwcp;
    }
    quickloadboard = 0;

    if (ournumsectors==0 || ournumwalls==0 || ournumsprites==0)  // nothing loaded
    {
        clipmapinfo_init();

        Bfree(fisec);
        Bfree(fispr);

        return -1;
    }

    // shrink
    loadsector = (sectortype *)Brealloc(loadsector, ournumsectors*sizeof(sectortype));
    loadwall = (walltype *)Brealloc(loadwall, ournumwalls*sizeof(walltype));

    Bmemcpy(sector, loadsector, ournumsectors*sizeof(sectortype));
    Bmemcpy(wall, loadwall, ournumwalls*sizeof(walltype));
    Bmemcpy(sprite, loadsprite, ournumsprites*sizeof(spritetype));
    numsectors = ournumsectors;
    numwalls = ournumwalls;

    //  vvvv    don't use headsprite[sect,stat]!   vvvv

    sectoidx = (int16_t *)Bmalloc(numsectors*sizeof(sectoidx[0]));
    if (!sectoidx || !sector || !wall)
    {
        clipmapinfo_init();

        Bfree(fisec);
        Bfree(fispr);

        return 1;
    }
    for (i=0; i<numsectors; i++)
        sectoidx[i] = CM_NONE;

    // determine outer sectors
    for (i=0; i<numsectors; i++)
    {
        for (w=sector[i].wallptr; w<sector[i].wallptr+sector[i].wallnum; w++)
            if (wall[w].nextsector<0)
            {
                sectoidx[i] = CM_OUTER;
                break;
            }
    }
    // break connections between outer sectors
    for (i=0; i<numsectors; i++)
    {
        if (sectoidx[i] == CM_OUTER)
            for (w=sector[i].wallptr; w<sector[i].wallptr+sector[i].wallnum; w++)
            {
                k = wall[w].nextwall;
                if (k>=0 && sectoidx[wall[w].nextsector]==CM_OUTER)
                {
                    wall[k].nextwall = wall[k].nextsector = -1;
                    wall[w].nextwall = wall[w].nextsector = -1;
                }
            }
    }

    {
        int16_t ns, outersect;
        int32_t pn,scnt, x,y,z, maxdist;

        sectq = (int16_t *)Bmalloc(numsectors*sizeof(sectq[0]));
        tempictoidx = (int16_t *)Bmalloc(MAXTILES*sizeof(tempictoidx[0]));
        if (!sectq || !tempictoidx)
        {
            clipmapinfo_init();

            Bfree(fisec);
            Bfree(fispr);

            return 1;
        }
        for (i=0; i<MAXTILES; i++)
            tempictoidx[i]=-1;

        // collect sprite picnums
        for (i=0; i<MAXSPRITES && sprite[i].statnum<MAXSTATUS; i++)
        {
            pn = sprite[i].picnum;
            k = sprite[i].sectnum;
            //    -v-  note the <=                         ignore sprites in outer sectors
            if (pn<=0 || pn>=MAXTILES || k<0 || k>=numsectors || (sectoidx[k]&CM_OUTER))
                continue;

            if (numclipmaps >= CM_MAX)
            {
                initprintf("warning: reached max clip map number %d, not processing any more\n", CM_MAX);
                break;
            }

            // chain
            if (pictoidx[pn]>=0)
            {
                if (sectoidx[k]&CM_SOME)
                {
                    for (fi = 0; fi < g_clipMapFilesNum; ++fi)
                        if (k>=fisec[fi])
                            break;
                    initprintf("clip map \"%s\": error: tried to chain picnum %d (sprite %d) in sector %d which"
                               " already belongs to picnum %d.\n", g_clipMapFiles[fi], pn, i-fispr[fi], k-fisec[fi],
                               clipinfo[sectoidx[k]].picnum);
                    clipmapinfo_init();

                    Bfree(fisec);
                    Bfree(fispr);

                    return 2;
                }

                // new one is front
                clipinfo[numclipmaps].next = pictoidx[pn];
                pictoidx[pn] = numclipmaps;
            }
            else
            {
                clipinfo[numclipmaps].next = -1;
                pictoidx[pn] = numclipmaps;
            }

            if (!CM_NOROT(i))
            {
                if (sprite[i].ang!=1536 && sprite[i].ang!=512)
                {
                    for (fi = 0; fi < g_clipMapFilesNum; ++fi)
                        if (i>=fispr[fi])
                            break;
                    initprintf("clip map \"%s\": warning: sprite %d pointing neither northward nor southward. %s will be wrong.\n",
                               g_clipMapFiles[fi], i-fispr[fi], (sprite[i].cstat&48)==32 ? "Scaling and flipping" : "X-flipping");
                }
            }

            clipinfo[numclipmaps].picnum = pn;

            // collect sectors
            scnt = numclipsects;
            sectq[numclipsects++] = k;
            sectoidx[k] = numclipmaps;

            clipinfo[numclipmaps].qbeg = scnt;

            outersect = -1;

            do
            {
                k = sectq[scnt];

                for (w=sector[k].wallptr; w<sector[k].wallptr+sector[k].wallnum; w++)
                {
                    ns = wall[w].nextsector;
                    if (ns>=0)
                    {
                        if (sectoidx[ns]==CM_NONE)
                        {
                            sectoidx[ns] = numclipmaps;
                            sectq[numclipsects++] = ns;
                        }
                        else if (sectoidx[ns]&CM_OUTER)
                        {
                            if (outersect>=0 && ns!=outersect)
                            {
                                for (fi = 0; fi < g_clipMapFilesNum; ++fi)
                                    if (ns>=fisec[fi])
                                        break;
                                initprintf("clip map \"%s\": error: encountered more than one outer sector (%d and %d)"
                                           " for sprite %d.\n", g_clipMapFiles[fi], outersect-fisec[fi], ns-fisec[fi], i-fispr[fi]);
                                clipmapinfo_init();

                                Bfree(fisec);
                                Bfree(fispr);

                                return 3;
                            }

                            outersect = ns;
                            sectoidx[outersect] |= numclipmaps;
                        }
                        else if (sectoidx[ns]!=numclipmaps)
                        {
                            for (fi = 0; fi < g_clipMapFilesNum; ++fi)
                                if (ns>=fisec[fi])
                                    break;
                            initprintf("clip map \"%s\": error: encountered sector %d belonging to index %d"
                                       " while collecting sectors for sprite %d (index %d).\n",
                                       g_clipMapFiles[fi], ns-fisec[fi], sectoidx[ns], i-fispr[fi], numclipmaps);
                            clipmapinfo_init();

                            Bfree(fisec);
                            Bfree(fispr);

                            return 4;
                        }
                    }
                }
            }
            while (++scnt < numclipsects);

            if (outersect==-1)
            {
                initprintf("clip map: INTERNAL ERROR: outersect==-1!\n");
                clipmapinfo_init();

                Bfree(fisec);
                Bfree(fispr);

                return 5;
            }

            sectq[numclipsects++] = outersect;  // last is outer
            clipinfo[numclipmaps].qend = numclipsects-1;

            // normalize
            maxdist = 0;

            for (scnt=clipinfo[numclipmaps].qbeg; scnt<=clipinfo[numclipmaps].qend; scnt++)
            {
                k = sectq[scnt];

                x = sprite[i].x;
                y = sprite[i].y;
                z = sprite[i].z;

                sector[k].floorz -= z;
                sector[k].ceilingz -= z;

                if (scnt==clipinfo[numclipmaps].qbeg)
                {
                    // backup sprite tags since we'll discard sprites later
                    sector[k].CM_XREPEAT = sprite[i].xrepeat;
                    sector[k].CM_YREPEAT = sprite[i].yrepeat;
                    sector[k].CM_XOFFSET = sprite[i].xoffset;
                    sector[k].CM_YOFFSET = sprite[i].yoffset;
                    sector[k].CM_CSTAT = sprite[i].cstat;
                    sector[k].CM_ANG = sprite[i].ang;
                }

                // backup floor and ceiling z
                CM_FLOORZ(k) = sector[k].floorz;
                CM_CEILINGZ(k) = sector[k].ceilingz;

                for (w=sector[k].wallptr; w<sector[k].wallptr+sector[k].wallnum; w++)
                {
                    wall[w].x -= x;
                    wall[w].y -= y;

                    if (scnt!=clipinfo[numclipmaps].qend)
                    {
                        if (CM_NOROT(i))
                        {
                            if (klabs(wall[w].x) > maxdist)
                                maxdist = klabs(wall[w].x);
                            if (klabs(wall[w].y) > maxdist)
                                maxdist = klabs(wall[w].y);
                        }
                        else
                        {
                            int32_t tmp = ksqrt(uhypsq(wall[w].x, wall[w].y));
                            if (tmp > maxdist)
                                maxdist = tmp;
                        }
                    }

                    // aliasing
                    if (wall[w].lotag>0 || wall[w].hitag>0)
                    {
                        int32_t ii;

                        if (wall[w].lotag>0 && wall[w].hitag>0)
                        {
                            if (wall[w].lotag > wall[w].hitag)
                                swapshort(&wall[w].lotag, &wall[w].hitag);

                            for (ii=wall[w].lotag; ii<wall[w].hitag; ii++)
                                tempictoidx[ii] = numclipmaps;
                        }
                        else if (wall[w].lotag>0)
                        {
                            if (wall[w].lotag<MAXTILES)
                                tempictoidx[wall[w].lotag] = numclipmaps;
                        }
                        else
                        {
                            if (wall[w].hitag<MAXTILES)
                                tempictoidx[wall[w].hitag] = numclipmaps;
                        }
                    }

                    CM_WALL_X(w) = wall[w].x;
                    CM_WALL_Y(w) = wall[w].y;
                }
            }

            clipinfo[numclipmaps].maxdist = maxdist;
            numclipmaps++;
        }
    }

    // yes, too much copying, but better than ugly code
    Bmemcpy(loadsector, sector, ournumsectors*sizeof(sectortype));
    Bmemcpy(loadwall, wall, ournumwalls*sizeof(walltype));

    // loadwallinv will contain all walls with inverted orientation for x/y-flip handling
    loadwallinv = (walltype *)Bmalloc(ournumwalls*sizeof(walltype));
    if (!loadwallinv)
    {
        clipmapinfo_init();

        Bfree(fisec);
        Bfree(fispr);

        return 1;
    }

    {
        int32_t j, loopstart, loopend, numloopwalls;

        // invert walls!
        loopstart = 0;
        for (j=0; j<ournumwalls; j++)
        {
            wall[j].nextsector = wall[j].nextwall = -1;

            if (wall[j].point2 < j)
            {
                loopend = j+1;
                numloopwalls = loopend-loopstart;

                if (numloopwalls<3)
                {
                    loopstart = loopend;
                    continue;
                }

                for (k=0; k<numloopwalls; k++)
                {
                    wall[loopstart+k].x = loadwall[loopstart + (numloopwalls+1-k)%numloopwalls].x;
                    wall[loopstart+k].y = loadwall[loopstart + (numloopwalls+1-k)%numloopwalls].y;

                    CM_WALL_X(loopstart+k) = wall[loopstart+k].x;
                    CM_WALL_Y(loopstart+k) = wall[loopstart+k].y;
                }

                loopstart = loopend;
            }
        }

        // reconstruct wall connections
        for (i=0; i<ournumsectors; i++)
        {
            for (j=sector[i].wallptr; j<sector[i].wallptr+sector[i].wallnum; j++)
                checksectorpointer(j, i);
        }
    }
    Bmemcpy(loadwallinv, wall, ournumwalls*sizeof(walltype));

    clipmapinfo.numsectors = numsectors;
    clipmapinfo.sector = loadsector;
    clipmapinfo.numwalls = numwalls;
    clipmapinfo.wall = loadwall;

    for (i=0; i<MAXTILES; i++)
    {
        if (pictoidx[i]==-1 && tempictoidx[i]>=0)
            pictoidx[i]=tempictoidx[i];
    }

    Bfree(loadsprite); loadsprite=NULL;
    Bfree(tempictoidx); tempictoidx=NULL;

    // don't let other code be distracted by the temporary map we constructed
    numsectors = 0;
    numwalls = 0;
    initspritelists();

    if (lwcp > 0)
        initprintf("Loaded clip map%s.\n", lwcp==1?"":"s");

    Bfree(fisec);
    Bfree(fispr);

    return 0;
}
#endif
////// //////

#define WALLS_ARE_CONSISTENT(k) ((wall[k].x == x2 && wall[k].y == y2)   \
                                 && ((wall[wall[k].point2]).x == x1 && (wall[wall[k].point2]).y == y1))

static int32_t getscore(int32_t w1c, int32_t w1f, int32_t w2c, int32_t w2f)
{
    int32_t minflor, maxceil;

    if (w1c > w1f)
        swaplong(&w1c, &w1f);
    if (w2c > w2f)
        swaplong(&w2c, &w2f);

    // now: c <= f for each "wall-vline"

    maxceil = max(w1c, w2c);
    minflor = min(w1f, w2f);

    return minflor-maxceil;
}

const int16_t *chsecptr_onextwall = NULL;

int32_t checksectorpointer(int16_t i, int16_t sectnum)
{
    int32_t startsec, endsec;
    int32_t j, k, startwall, endwall, x1, y1, x2, y2, numnewwalls=0;
    int32_t bestnextwall=-1, bestnextsec=-1, bestwallscore=INT32_MIN;
    int32_t cz[4], fz[4], tmp[2], tmpscore=0;
#ifdef YAX_ENABLE
    int16_t cb[2], fb[2];
#endif

#if 0
    if (checksectorpointer_warn && (i<0 || i>=max(numwalls,newnumwalls)))
    {
        char buf[128];
        Bsprintf(buf, "WARN: checksectorpointer called with i=%d but (new)numwalls=%d", i, max(numwalls,newnumwalls));
        OSD_Printf("%s\n", buf);
        printmessage16("%s", buf);
        return 0;
    }
#endif

    x1 = wall[i].x;
    y1 = wall[i].y;
    x2 = (wall[wall[i].point2]).x;
    y2 = (wall[wall[i].point2]).y;

    k = wall[i].nextwall;
    if (k >= 0)          //Check for early exit
    {
        if (WALLS_ARE_CONSISTENT(k))
            return 0;

        wall[k].nextwall = wall[k].nextsector = -1;
    }

    if ((unsigned)wall[i].nextsector < (unsigned)numsectors && wall[i].nextwall < 0)
    {
        // if we have a nextsector but no nextwall, take this as a hint
        // to search only the walls of that sector
        startsec = wall[i].nextsector;
        endsec = startsec+1;
    }
    else
    {
        startsec = 0;
        endsec = numsectors;
    }

    wall[i].nextsector = wall[i].nextwall = -1;

    if (chsecptr_onextwall && (k=chsecptr_onextwall[i])>=0 && wall[k].nextwall<0)
    {
        // old next wall found
        if (WALLS_ARE_CONSISTENT(k))
        {
            j = sectorofwall(k);

            wall[i].nextsector = j;
            wall[i].nextwall = k;
            wall[k].nextsector = sectnum;
            wall[k].nextwall = i;

            return 1;
        }
    }

    for (j=startsec; j<endsec; j++)
    {
        if (j == sectnum)
            continue;

        YAX_SKIPSECTOR(j);

        startwall = sector[j].wallptr;
        endwall = startwall + sector[j].wallnum;
        for (k=startwall; k<endwall; k++)
        {
            if (!WALLS_ARE_CONSISTENT(k))
                continue;

            // Don't create link if the other side is connected to another wall.
            // The nextwall relation should be definitely one-to-one at all times!
            if (wall[k].nextwall>=0 && wall[k].nextwall != i)
                continue;
#ifdef YAX_ENABLE
            yax_getbunches(sectnum, &cb[0], &fb[0]);
            yax_getbunches(j, &cb[1], &fb[1]);

            if ((cb[0]>=0 && cb[0]==cb[1]) || (fb[0]>=0 && fb[0]==fb[1]))
            {
                tmpscore = INT32_MAX;
            }
            else
#endif
            {
                getzsofslope(sectnum, x1,y1, &cz[0],&fz[0]);
                getzsofslope(sectnum, x2,y2, &cz[1],&fz[1]);
                getzsofslope(j, x1,y1, &cz[2],&fz[2]);
                getzsofslope(j, x2,y2, &cz[3],&fz[3]);

                tmp[0] = getscore(cz[0],fz[0], cz[2],fz[2]);
                tmp[1] = getscore(cz[1],fz[1], cz[3],fz[3]);

                if ((tmp[0]^tmp[1]) >= 0)
                    tmpscore = tmp[0]+tmp[1];
                else
                    tmpscore = max(tmp[0], tmp[1]);
            }

            if (bestnextwall == -1 || tmpscore > bestwallscore)
            {
                bestwallscore = tmpscore;
                bestnextwall = k;
                bestnextsec = j;
            }

            numnewwalls++;
        }
    }

    // sectnum -2 means dry run
    if (bestnextwall >= 0 && sectnum!=-2)
#ifdef YAX_ENABLE
        // for walls with TROR neighbors, be conservative in case if score <=0
        // (meaning that no wall area is mutually visible) -- it could be that
        // another sector is a better candidate later on
        if ((yax_getnextwall(i, 0)<0 && yax_getnextwall(i, 1)<0) || bestwallscore>0)
#endif
        {
//    initprintf("w%d new nw=%d (score %d)\n", i, bestnextwall, bestwallscore)
            wall[i].nextsector = bestnextsec;
            wall[i].nextwall = bestnextwall;
            wall[bestnextwall].nextsector = sectnum;
            wall[bestnextwall].nextwall = i;
        }

    return numnewwalls;
}

#undef WALLS_ARE_CONSISTENT


#if defined(_MSC_VER) && !defined(NOASM)

//
// Microsoft C Inline Assembly Routines
//

static inline int32_t nsqrtasm(int32_t a)
{
    _asm
    {
        push ebx
        mov eax, a
        test eax, 0xff000000
        mov ebx, eax
        jnz short over24
        shr ebx, 12
        mov cx, word ptr shlookup[ebx*2]
        jmp short under24
        over24:
        shr ebx, 24
        mov cx, word ptr shlookup[ebx*2+8192]
        under24:
        shr eax, cl
        mov cl, ch
        mov ax, word ptr sqrtable[eax*2]
        shr eax, cl
        pop ebx
    }
}

static inline int32_t msqrtasm(int32_t c)
{
    _asm
    {
        push ebx
        mov ecx, c
        mov eax, 0x40000000
        mov ebx, 0x20000000
        begit:
        cmp ecx, eax
        jl skip
        sub ecx, eax
        lea eax, [eax+ebx*4]
        skip:
        sub eax, ebx
        shr eax, 1
        shr ebx, 2
        jnz begit
        cmp ecx, eax
        sbb eax, -1
        shr eax, 1
        pop ebx
    }
}

//0x007ff000 is (11<<13), 0x3f800000 is (127<<23)
static inline int32_t krecipasm(int32_t a)
{
    _asm
    {
        push ebx
        mov eax, a
        mov fpuasm, eax
        fild dword ptr fpuasm
        add eax, eax
        fstp dword ptr fpuasm
        sbb ebx, ebx
        mov eax, fpuasm
        mov ecx, eax
        and eax, 0x007ff000
        shr eax, 10
        sub ecx, 0x3f800000
        shr ecx, 23
        mov eax, dword ptr reciptable[eax]
        sar eax, cl
        xor eax, ebx
        pop ebx
    }
}

static inline int32_t getclipmask(int32_t a, int32_t b, int32_t c, int32_t d)
{
    _asm
    {
        push ebx
        mov eax, a
        mov ebx, b
        mov ecx, c
        mov edx, d
        sar eax, 31
        add ebx, ebx
        adc eax, eax
        add ecx, ecx
        adc eax, eax
        add edx, edx
        adc eax, eax
        mov ebx, eax
        shl ebx, 4
        or al, 0xf0
        xor eax, ebx
        pop ebx
    }
}

static inline int32_t getkensmessagecrc(void *b)
{
    _asm
    {
        push ebx
        mov ebx, b
        xor eax, eax
        mov ecx, 32
        beg:
        mov edx, dword ptr [ebx+ecx*4-4]
        ror edx, cl
        adc eax, edx
        bswap eax
        loop short beg
        pop ebx
    }
}

#elif defined(__GNUC__) && defined(__i386__) && !defined(NOASM)	// _MSC_VER

//
// GCC "Inline" Assembly Routines
//

#define nsqrtasm(a) \
    ({ int32_t __r, __a=(a); \
       __asm__ __volatile__ ( \
        "testl $0xff000000, %%eax\n\t" \
        "movl %%eax, %%ebx\n\t" \
        "jnz 0f\n\t" \
        "shrl $12, %%ebx\n\t" \
        "movw "ASMSYM("shlookup")"(,%%ebx,2), %%cx\n\t" \
        "jmp 1f\n\t" \
        "0:\n\t" \
        "shrl $24, %%ebx\n\t" \
        "movw ("ASMSYM("shlookup")"+8192)(,%%ebx,2), %%cx\n\t" \
        "1:\n\t" \
        "shrl %%cl, %%eax\n\t" \
        "movb %%ch, %%cl\n\t" \
        "movw "ASMSYM("sqrtable")"(,%%eax,2), %%ax\n\t" \
        "shrl %%cl, %%eax" \
        : "=a" (__r) : "a" (__a) : "ebx", "ecx", "cc"); \
     __r; })

// edx is blown by this code somehow?!
#define msqrtasm(c) \
    ({ int32_t __r, __c=(c); \
       __asm__ __volatile__ ( \
        "movl $0x40000000, %%eax\n\t" \
        "movl $0x20000000, %%ebx\n\t" \
        "0:\n\t" \
        "cmpl %%eax, %%ecx\n\t" \
        "jl 1f\n\t" \
        "subl %%eax, %%ecx\n\t" \
        "leal (%%eax,%%ebx,4), %%eax\n\t" \
        "1:\n\t" \
        "subl %%ebx, %%eax\n\t" \
        "shrl $1, %%eax\n\t" \
        "shrl $2, %%ebx\n\t" \
        "jnz 0b\n\t" \
        "cmpl %%eax, %%ecx\n\t" \
        "sbbl $-1, %%eax\n\t" \
        "shrl $1, %%eax" \
        : "=a" (__r) : "c" (__c) : "edx","ebx", "cc"); \
     __r; })

#define krecipasm(a) \
    ({ int32_t __a=(a); \
       __asm__ __volatile__ ( \
            "movl %%eax, ("ASMSYM("fpuasm")"); fildl ("ASMSYM("fpuasm")"); " \
            "addl %%eax, %%eax; fstps ("ASMSYM("fpuasm")"); sbbl %%ebx, %%ebx; " \
            "movl ("ASMSYM("fpuasm")"), %%eax; movl %%eax, %%ecx; " \
            "andl $0x007ff000, %%eax; shrl $10, %%eax; subl $0x3f800000, %%ecx; " \
            "shrl $23, %%ecx; movl "ASMSYM("reciptable")"(%%eax), %%eax; " \
            "sarl %%cl, %%eax; xorl %%ebx, %%eax" \
        : "=a" (__a) : "a" (__a) : "ebx", "ecx", "memory", "cc"); \
     __a; })

#define getclipmask(a,b,c,d) \
    ({ int32_t __a=(a), __b=(b), __c=(c), __d=(d); \
       __asm__ __volatile__ ("sarl $31, %%eax; addl %%ebx, %%ebx; adcl %%eax, %%eax; " \
                "addl %%ecx, %%ecx; adcl %%eax, %%eax; addl %%edx, %%edx; " \
                "adcl %%eax, %%eax; movl %%eax, %%ebx; shl $4, %%ebx; " \
                "orb $0xf0, %%al; xorl %%ebx, %%eax" \
        : "=a" (__a), "=b" (__b), "=c" (__c), "=d" (__d) \
        : "a" (__a), "b" (__b), "c" (__c), "d" (__d) : "cc"); \
     __a; })


#define getkensmessagecrc(b) \
    ({ int32_t __a, __b=(b); \
       __asm__ __volatile__ ( \
        "xorl %%eax, %%eax\n\t" \
        "movl $32, %%ecx\n\t" \
        "0:\n\t" \
        "movl -4(%%ebx,%%ecx,4), %%edx\n\t" \
        "rorl %%cl, %%edx\n\t" \
        "adcl %%edx, %%eax\n\t" \
        "bswapl %%eax\n\t" \
        "loop 0b" \
        : "=a" (__a) : "b" (__b) : "ecx", "edx" \
     __a; })

#else   // __GNUC__ && __i386__

static inline int32_t nsqrtasm(uint32_t a)
{
    // JBF 20030901: This was a damn lot simpler to reverse engineer than
    // msqrtasm was. Really, it was just like simplifying an algebra equation.
    uint16_t c;

    if (a & 0xff000000)  			// test eax, 0xff000000  /  jnz short over24
    {
        c = shlookup[(a >> 24) + 4096];	// mov ebx, eax
        // over24: shr ebx, 24
        // mov cx, word ptr shlookup[ebx*2+8192]
    }
    else
    {
        c = shlookup[a >> 12];		// mov ebx, eax
        // shr ebx, 12
        // mov cx, word ptr shlookup[ebx*2]
        // jmp short under24
    }
    a >>= c&0xff;				// under24: shr eax, cl
    a = (a&0xffff0000)|(sqrtable[a]);	// mov ax, word ptr sqrtable[eax*2]
    a >>= ((c&0xff00) >> 8);		// mov cl, ch
    // shr eax, cl
    return a;
}

static inline int32_t msqrtasm(uint32_t c)
{
    uint32_t a,b;

    a = 0x40000000l;		// mov eax, 0x40000000
    b = 0x20000000l;		// mov ebx, 0x20000000
    do  				// begit:
    {
        if (c >= a)  		// cmp ecx, eax	 /  jl skip
        {
            c -= a;		// sub ecx, eax
            a += b*4;	// lea eax, [eax+ebx*4]
        }			// skip:
        a -= b;			// sub eax, ebx
        a >>= 1;		// shr eax, 1
        b >>= 2;		// shr ebx, 2
    }
    while (b);			// jnz begit
    if (c >= a)			// cmp ecx, eax
        a++;			// sbb eax, -1
    a >>= 1;			// shr eax, 1
    return a;
}

static inline int32_t krecipasm(int32_t i)
{
    // Ken did this
    float f = (float)i; i = *(int32_t *)&f;
    return((reciptable[(i>>12)&2047]>>(((i-0x3f800000)>>23)&31))^(i>>31));
}


static inline int32_t getclipmask(int32_t a, int32_t b, int32_t c, int32_t d)
{
    // Ken did this
    d = ((a<0)*8) + ((b<0)*4) + ((c<0)*2) + (d<0);
    return(((d<<4)^0xf0)|d);
}

inline int32_t getkensmessagecrc(int32_t b)
{
    UNREFERENCED_PARAMETER(b);
    return 0x56c764d4l;
}

#endif


int32_t xb1[MAXWALLSB];  // Polymost uses this as a temp array
static int32_t yb1[MAXWALLSB], xb2[MAXWALLSB], yb2[MAXWALLSB];
int32_t rx1[MAXWALLSB], ry1[MAXWALLSB];
static int32_t rx2[MAXWALLSB], ry2[MAXWALLSB];
int16_t p2[MAXWALLSB], thesector[MAXWALLSB];

int16_t bunchfirst[MAXWALLSB], bunchlast[MAXWALLSB];

static int32_t smostcnt;
static int16_t smost[MAXYSAVES];
static int32_t smoststart[MAXWALLSB];
static char smostwalltype[MAXWALLSB];
static int32_t smostwall[MAXWALLSB], smostwallcnt = -1;

static int32_t spritesx[MAXSPRITESONSCREEN];
static int32_t spritesy[MAXSPRITESONSCREEN+1];
static int32_t spritesz[MAXSPRITESONSCREEN];

static int16_t umost[MAXXDIM], dmost[MAXXDIM];
static int16_t bakumost[MAXXDIM], bakdmost[MAXXDIM];
static int16_t uplc[MAXXDIM], dplc[MAXXDIM];
static int16_t uwall[MAXXDIM], dwall[MAXXDIM];
static int32_t swplc[MAXXDIM], lplc[MAXXDIM];
static int32_t swall[MAXXDIM], lwall[MAXXDIM+4];
#ifdef HIGH_PRECISION_SPRITE
static float swallf[MAXXDIM];
#endif
int32_t xdimen = -1, xdimenrecip, halfxdimen, xdimenscale, xdimscale;
int32_t ydimen;
static int32_t wx1, wy1, wx2, wy2;
intptr_t frameoffset;

static int32_t nrx1[8], nry1[8], nrx2[8], nry2[8]; // JBF 20031206: Thanks Ken

static int32_t rxi[8], ryi[8], rzi[8], rxi2[8], ryi2[8], rzi2[8];
static int32_t xsi[8], ysi[8], horizycent;
static int32_t *horizlookup=0, *horizlookup2=0;

int32_t globalposx, globalposy, globalposz, globalhoriz;
int16_t globalang, globalcursectnum;
int32_t globalpal, cosglobalang, singlobalang;
int32_t cosviewingrangeglobalang, sinviewingrangeglobalang;
static char *globalpalwritten;
static int32_t globaluclip, globaldclip;
int32_t globvis, globalvisibility;
int32_t globalhisibility, globalpisibility, globalcisibility;
//char globparaceilclip, globparaflorclip;

int32_t xyaspect;
static int32_t viewingrangerecip;

static char globalxshift, globalyshift;
static int32_t globalxpanning, globalypanning;
int32_t globalshade, globalorientation;
int16_t globalpicnum;
static int16_t globalshiftval;
#ifdef HIGH_PRECISION_SPRITE
static int64_t globalzd;
#else
static int32_t globalzd;
#endif
static int32_t globalyscale;
static int32_t globalxspan, globalyspan, globalispow2=1;  // true if texture has power-of-two x and y size
static intptr_t globalbufplc;

static int32_t globaly1, globalx2, globalzx;
static int32_t globalx, globaly, globalz;

int16_t sectorborder[256], sectorbordercnt;
int32_t ydim16, qsetmode = 0;
int16_t pointhighlight=-1, linehighlight=-1, highlightcnt=0;
static int32_t lastx[MAXYDIM];
static char *transluc;

static char paletteloaded = 0;

int32_t halfxdim16, midydim16;

#define FASTPALGRIDSIZ 8
static int32_t rdist[129], gdist[129], bdist[129];
static char colhere[((FASTPALGRIDSIZ+2)*(FASTPALGRIDSIZ+2)*(FASTPALGRIDSIZ+2))>>3];
static char colhead[(FASTPALGRIDSIZ+2)*(FASTPALGRIDSIZ+2)*(FASTPALGRIDSIZ+2)];
static int32_t colnext[256];
static char coldist[8] = {0,1,2,3,4,3,2,1};
static int32_t colscan[27];

static int16_t clipnum, hitwalls[4];
const int32_t hitscangoalx = (1<<29)-1, hitscangoaly = (1<<29)-1;
#ifdef USE_OPENGL
int32_t hitallsprites = 0;
#endif

typedef struct { int32_t x1, y1, x2, y2; } linetype;
static linetype clipit[MAXCLIPNUM];
static int32_t clipsectnum, origclipsectnum, clipspritenum;
static int16_t clipsectorlist[MAXCLIPNUM], origclipsectorlist[MAXCLIPNUM];
#ifdef HAVE_CLIPSHAPE_FEATURE
static int16_t clipspritelist[MAXCLIPNUM];  // sector-like sprite clipping
#endif
static int16_t clipobjectval[MAXCLIPNUM];

typedef struct
{
    int32_t sx, sy, z;
    int16_t a, picnum;
    int8_t dashade;
    char dapalnum, dastat;
    uint8_t daalpha;
    char pagesleft;
    int32_t cx1, cy1, cx2, cy2;
    int32_t uniqid;    //JF extension
} permfifotype;
static permfifotype permfifo[MAXPERMS];
static int32_t permhead = 0, permtail = 0;

int16_t numscans, numbunches;
static int16_t numhits;
int16_t capturecount = 0;

char vgapal16[4*256] =
{
    00,00,00,00, 42,00,00,00, 00,42,00,00, 42,42,00,00, 00,00,42,00,
    42,00,42,00, 00,21,42,00, 42,42,42,00, 21,21,21,00, 63,21,21,00,
    21,63,21,00, 63,63,21,00, 21,21,63,00, 63,21,63,00, 21,63,63,00,
    63,63,63,00
};

int16_t searchit;
int32_t searchx = -1, searchy;                          //search input
int16_t searchsector, searchwall, searchstat;     //search output

// SEARCHBOTTOMWALL:
//   When aiming at a the bottom part of a 2-sided wall whose bottom part
//   is swapped (.cstat&2), searchbottomwall equals that wall's .nextwall. In all
//   other cases (when aiming at a wall), searchbottomwall equals searchwall.
//
// SEARCHISBOTTOM:
//  When aiming at a 2-sided wall, 1 if aiming at the bottom part, 0 else
int16_t searchbottomwall, searchisbottom;

double msens = 1.0;

static char artfilename[20];
static int32_t artfil = -1, artfilnum, artfilplc;

char inpreparemirror = 0;
static int32_t mirrorsx1, mirrorsy1, mirrorsx2, mirrorsy2;

static int32_t setviewcnt = 0; // interface layers use this now
static int32_t bakframeplace[4], bakxsiz[4], bakysiz[4];
static int32_t bakwindowx1[4], bakwindowy1[4];
static int32_t bakwindowx2[4], bakwindowy2[4];
#ifdef USE_OPENGL
static int32_t bakrendmode,baktile;
#endif

int32_t totalclocklock;

char apptitle[256] = "Build Engine";

static uint8_t basepalreset=1;
uint8_t basepalcount;
uint8_t curbasepal;

static uint32_t g_lastpalettesum = 0;
palette_t curpalette[256];			// the current palette, unadjusted for brightness or tint
palette_t curpalettefaded[256];		// the current palette, adjusted for brightness and tint (ie. what gets sent to the card)
palette_t palfadergb = { 0,0,0,0 };
char palfadedelta = 0;



//
// Internal Engine Functions
//
//int32_t cacheresets = 0,cacheinvalidates = 0;

static void setpalettefade_calc(uint8_t offset);

void fade_screen_black(int32_t moreopaquep)
{
#ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST)
    {
        fullscreen_tint_gl(0,0,0, moreopaquep ? 168 : 84);
    }
    else
#endif
    {
        Bassert(!offscreenrendering);

        begindrawing();
        {
            char *const p = (char *)frameplace;
            const char *const trans = transluc;
            const int32_t shiftamnt = ((!!moreopaquep)*8);
            const int32_t dimprod = xdim*ydim;

            int32_t i;

            for (i=0; i<dimprod; i++)
                p[i] = trans[p[i]<<shiftamnt];
        }
        enddrawing();
    }
}


// returns: 0=continue sprite collecting;
//          1=break out of sprite collecting;
int32_t engine_addtsprite(int16_t z, int16_t sectnum)
{
    spritetype *spr = &sprite[z];
#ifdef YAX_ENABLE
    int16_t cb, fb, *sortcnt;
    int32_t spheight, spzofs;

    if (g_nodraw==0)
    {
        if (numyaxbunches==0)
        {
#endif
            if (spritesortcnt >= MAXSPRITESONSCREEN)
                return 1;

            Bmemcpy(&tsprite[spritesortcnt], spr, sizeof(spritetype));
            tsprite[spritesortcnt++].owner = z;

#ifdef YAX_ENABLE
        }
    }
    else
#ifdef YAX_ENABLE
        if (yax_nomaskpass==0)
#endif
    {
        sortcnt = &yax_spritesortcnt[yax_globallev];
        if (*sortcnt >= MAXSPRITESONSCREEN)
            return 1;

        yax_tsprite[yax_globallev][*sortcnt] = z;
        if (yax_globalbunch >= 0)
        {
            yax_tsprite[yax_globallev][*sortcnt] |= (MAXSPRITES|(MAXSPRITES<<1));
            yax_tsprfrombunch[yax_globallev][*sortcnt] = yax_globalbunch;
        }
        (*sortcnt)++;

        // now check whether the tsprite needs duplication into another level
        if ((spr->cstat&48)==32)
            return 0;

        yax_getbunches(sectnum, &cb, &fb);
        if (cb < 0 && fb < 0)
            return 0;

        spzofs = spriteheightofs(z, &spheight, 1);

        // TODO: get*zofslope?
        if (cb>=0 && spr->z+spzofs-spheight < sector[sectnum].ceilingz)
        {
            sortcnt = &yax_spritesortcnt[yax_globallev-1];
            if (*sortcnt < MAXSPRITESONSCREEN)
            {
                yax_tsprite[yax_globallev-1][*sortcnt] = z|MAXSPRITES;
                (*sortcnt)++;
            }
        }
        if (fb>=0 && spr->z+spzofs > sector[sectnum].floorz)
        {
            sortcnt = &yax_spritesortcnt[yax_globallev+1];
            if (*sortcnt < MAXSPRITESONSCREEN)
            {
                yax_tsprite[yax_globallev+1][*sortcnt] = z|(MAXSPRITES<<1);
                (*sortcnt)++;
            }
        }
    }
#endif

    return 0;
}

//
// scansector (internal)
//
static void scansector(int16_t sectnum)
{
    walltype *wal, *wal2;
    spritetype *spr;
    int32_t xs, ys, x1, y1, x2, y2, xp1, yp1, xp2=0, yp2=0, tempint;
    int16_t z, zz, startwall, endwall, numscansbefore, scanfirst, bunchfrst;
    int16_t nextsectnum;

    if (sectnum < 0) return;

    sectorborder[0] = sectnum, sectorbordercnt = 1;
    do
    {
        sectnum = sectorborder[--sectorbordercnt];
#ifdef YAX_ENABLE
        if (scansector_collectsprites)
#endif
        for (z=headspritesect[sectnum]; z>=0; z=nextspritesect[z])
        {
            spr = &sprite[z];
            if ((((spr->cstat&0x8000) == 0) || (showinvisibility)) &&
                    (spr->xrepeat > 0) && (spr->yrepeat > 0))
            {
                xs = spr->x-globalposx; ys = spr->y-globalposy;
                if ((spr->cstat&48) || ((int64_t)xs*cosglobalang+(int64_t)ys*singlobalang > 0))
                    if ((spr->cstat&(64+48))!=(64+16) || dmulscale6(sintable[(spr->ang+512)&2047],-xs, sintable[spr->ang&2047],-ys) > 0)
                        if (engine_addtsprite(z, sectnum))
                            break;
            }
        }

        gotsector[sectnum>>3] |= pow2char[sectnum&7];

        bunchfrst = numbunches;
        numscansbefore = numscans;

        startwall = sector[sectnum].wallptr;
        endwall = startwall + sector[sectnum].wallnum;
        scanfirst = numscans;
        for (z=startwall,wal=&wall[z]; z<endwall; z++,wal++)
        {
            nextsectnum = wal->nextsector;

            wal2 = &wall[wal->point2];
            x1 = wal->x-globalposx; y1 = wal->y-globalposy;
            x2 = wal2->x-globalposx; y2 = wal2->y-globalposy;

            if ((nextsectnum >= 0) && ((wal->cstat&32) == 0))
#ifdef YAX_ENABLE
                if (yax_nomaskpass==0 || !yax_isislandwall(z, !yax_globalcf) || (yax_nomaskdidit=1, 0))
#endif
                if ((gotsector[nextsectnum>>3]&pow2char[nextsectnum&7]) == 0)
                {
                    // OV: E2L10
                    int64_t temp = (int64_t)x1*y2-(int64_t)x2*y1;
                    tempint = temp;
                    if (((uint64_t)tempint+262144) < 524288)  // BXY_MAX?
                        if (mulscale5(tempint,tempint) <= (x2-x1)*(x2-x1)+(y2-y1)*(y2-y1))
                            sectorborder[sectorbordercnt++] = nextsectnum;
                }

            if ((z == startwall) || (wall[z-1].point2 != z))
            {
                xp1 = dmulscale6(y1,cosglobalang,-x1,singlobalang);
                yp1 = dmulscale6(x1,cosviewingrangeglobalang,y1,sinviewingrangeglobalang);
            }
            else
            {
                xp1 = xp2;
                yp1 = yp2;
            }
            xp2 = dmulscale6(y2,cosglobalang,-x2,singlobalang);
            yp2 = dmulscale6(x2,cosviewingrangeglobalang,y2,sinviewingrangeglobalang);
            if ((yp1 < 256) && (yp2 < 256)) goto skipitaddwall;

            //If wall's NOT facing you
            if (dmulscale32(xp1,yp2,-xp2,yp1) >= 0) goto skipitaddwall;

            if (xp1 >= -yp1)
            {
                if ((xp1 > yp1) || (yp1 == 0)) goto skipitaddwall;
                xb1[numscans] = halfxdimen + scale(xp1,halfxdimen,yp1);
                if (xp1 >= 0) xb1[numscans]++;   //Fix for SIGNED divide
                if (xb1[numscans] >= xdimen) xb1[numscans] = xdimen-1;
                yb1[numscans] = yp1;
            }
            else
            {
                if (xp2 < -yp2) goto skipitaddwall;
                xb1[numscans] = 0;
                tempint = yp1-yp2+xp1-xp2;
                if (tempint == 0) goto skipitaddwall;
                yb1[numscans] = yp1 + scale(yp2-yp1,xp1+yp1,tempint);
            }
            if (yb1[numscans] < 256) goto skipitaddwall;

            if (xp2 <= yp2)
            {
                if ((xp2 < -yp2) || (yp2 == 0)) goto skipitaddwall;
                xb2[numscans] = halfxdimen + scale(xp2,halfxdimen,yp2) - 1;
                if (xp2 >= 0) xb2[numscans]++;   //Fix for SIGNED divide
                if (xb2[numscans] >= xdimen) xb2[numscans] = xdimen-1;
                yb2[numscans] = yp2;
            }
            else
            {
                if (xp1 > yp1) goto skipitaddwall;
                xb2[numscans] = xdimen-1;
                tempint = xp2-xp1+yp1-yp2;
                if (tempint == 0) goto skipitaddwall;
                yb2[numscans] = yp1 + scale(yp2-yp1,yp1-xp1,tempint);
            }
            if ((yb2[numscans] < 256) || (xb1[numscans] > xb2[numscans])) goto skipitaddwall;

            //Made it all the way!
            thesector[numscans] = sectnum; thewall[numscans] = z;
            rx1[numscans] = xp1; ry1[numscans] = yp1;
            rx2[numscans] = xp2; ry2[numscans] = yp2;
            p2[numscans] = numscans+1;
            numscans++;
skipitaddwall:

            if ((wall[z].point2 < z) && (scanfirst < numscans))
                p2[numscans-1] = scanfirst, scanfirst = numscans;
        }

        for (z=numscansbefore; z<numscans; z++)
            if ((wall[thewall[z]].point2 != thewall[p2[z]]) || (xb2[z] >= xb1[p2[z]]))
            {
                bunchfirst[numbunches++] = p2[z], p2[z] = -1;
#ifdef YAX_ENABLE
                if (scansector_retfast)
                    return;
#endif
            }

        for (z=bunchfrst; z<numbunches; z++)
        {
            for (zz=bunchfirst[z]; p2[zz]>=0; zz=p2[zz]);
            bunchlast[z] = zz;
        }
    }
    while (sectorbordercnt > 0);
}


////////// *WALLSCAN HELPERS //////////

#define WSHELPER_DECL inline //ATTRIBUTE((always_inline))

static WSHELPER_DECL void tweak_tsizes(int32_t *tsizx, int32_t *tsizy)
{
    if (pow2long[picsiz[globalpicnum]&15] == *tsizx)
        *tsizx = *tsizx-1;
    else
        *tsizx = -*tsizx;

    if (pow2long[picsiz[globalpicnum]>>4] == *tsizy)
        *tsizy = (picsiz[globalpicnum]>>4);
    else
        *tsizy = -*tsizy;
}

static WSHELPER_DECL void calc_bufplc(intptr_t *bufplc, int32_t lw, int32_t tsizx, int32_t tsizy)
{
    int32_t i = lw + globalxpanning;

    if (i >= tsizx)
    {
        if (tsizx < 0)
            i %= tsizx;
        else
            i &= tsizx;
    }

    if (tsizy < 0)
        i *= -tsizy;
    else
        i <<= tsizy;

    // Address is at the first row of tile storage (which is column-major).
    *bufplc = waloff[globalpicnum] + i;
}

static WSHELPER_DECL void calc_vplcinc_wall(uint32_t *vplc, int32_t *vinc, int64_t sw, int32_t y1v)
{
    *vinc = sw*globalyscale;
    *vplc = globalzd + (uint32_t)(*vinc)*(y1v-globalhoriz+1);
}

#ifdef HIGH_PRECISION_SPRITE
static WSHELPER_DECL void calc_vplcinc_sprite(uint32_t *vplc, int32_t *vinc, int32_t x, int32_t y1v)
{
    int64_t tmpvinc = swallf[x];
    int64_t tmpvplc = globalzd + tmpvinc*(y1v-globalhoriz+1);

    *vinc = tmpvinc;
    // Clamp the vertical texture coordinate!
    *vplc = min(max(0, tmpvplc), UINT32_MAX);
}
#endif

static int32_t drawing_sprite = 0;

static WSHELPER_DECL void calc_vplcinc(uint32_t *vplc, int32_t *vinc, const int32_t *swal, int32_t x, int32_t y1v)
{
#if !defined HIGH_PRECISION_SPRITE
    (void)drawing_sprite;
#else
    if (drawing_sprite)
        calc_vplcinc_sprite(vplc, vinc, x, y1v);
    else
#endif
        calc_vplcinc_wall(vplc, vinc, swal[x], y1v);
}

#undef NONPOW2_YSIZE_ASM
#if !defined ENGINE_USING_A_C
# if defined CLASSIC_NONPOW2_YSIZE_WALLS || defined CLASSIC_NONPOW2_YSIZE_SPRITES
#  define NONPOW2_YSIZE_ASM
# endif
#endif


//
// maskwallscan (internal)
//
static void maskwallscan(int32_t x1, int32_t x2, int32_t saturatevplc)
{
    int32_t x;
    intptr_t p, fpalookup;
    int32_t y1ve[4], y2ve[4], tsizx, tsizy;
#ifdef MULTI_COLUMN_VLINE
    char bad;
    int32_t u4, d4, dax, z;
#endif
    setgotpic(globalpicnum);
    if (globalshiftval < 0)
        return;

    tsizx = tilesizx[globalpicnum];
    tsizy = tilesizy[globalpicnum];
    if ((tsizx <= 0) || (tsizy <= 0)) return;
    if ((uwall[x1] > ydimen) && (uwall[x2] > ydimen)) return;
    if ((dwall[x1] < 0) && (dwall[x2] < 0)) return;

    if (waloff[globalpicnum] == 0) loadtile(globalpicnum);

    tweak_tsizes(&tsizx, &tsizy);

    if (palookup[globalpal] == NULL)
        globalpal = 0;

    fpalookup = FP_OFF(palookup[globalpal]);

    setupmvlineasm(globalshiftval, saturatevplc);


    x = x1;
    while ((startumost[x+windowx1] > startdmost[x+windowx1]) && (x <= x2))
        x++;

    p = x+frameoffset;

#ifdef NONPOW2_YSIZE_ASM
    if (globalshiftval==0)
        goto do_mvlineasm1;
#endif

#ifdef MULTI_COLUMN_VLINE
    for (; (x<=x2)&&(p&3); x++,p++)
    {
        y1ve[0] = max(uwall[x],startumost[x+windowx1]-windowy1);
        y2ve[0] = min(dwall[x],startdmost[x+windowx1]-windowy1);
        if (y2ve[0] <= y1ve[0]) continue;

        palookupoffse[0] = fpalookup + getpalookupsh(mulscale16(swall[x],globvis));

        calc_bufplc(&bufplce[0], lwall[x], tsizx, tsizy);
        calc_vplcinc(&vplce[0], &vince[0], swall, x, y1ve[0]);

        mvlineasm1(vince[0],palookupoffse[0],y2ve[0]-y1ve[0]-1,vplce[0],bufplce[0],p+ylookup[y1ve[0]]);
    }
    for (; x<=x2-3; x+=4,p+=4)
    {
        intptr_t pp;

        bad = 0;
        for (z=3,dax=x+3; z>=0; z--,dax--)
        {
            y1ve[z] = max(uwall[dax],startumost[dax+windowx1]-windowy1);
            y2ve[z] = min(dwall[dax],startdmost[dax+windowx1]-windowy1)-1;
            if (y2ve[z] < y1ve[z]) { bad += pow2char[z]; continue; }

            calc_bufplc(&bufplce[z], lwall[dax], tsizx, tsizy);
            calc_vplcinc(&vplce[z], &vince[z], swall, dax, y1ve[z]);
        }
        if (bad == 15) continue;

        palookupoffse[0] = fpalookup + getpalookupsh(mulscale16(swall[x],globvis));
        palookupoffse[3] = fpalookup + getpalookupsh(mulscale16(swall[x+3],globvis));

        if ((palookupoffse[0] == palookupoffse[3]) && ((bad&0x9) == 0))
        {
            palookupoffse[1] = palookupoffse[0];
            palookupoffse[2] = palookupoffse[0];
        }
        else
        {
            palookupoffse[1] = fpalookup + getpalookupsh(mulscale16(swall[x+1],globvis));
            palookupoffse[2] = fpalookup + getpalookupsh(mulscale16(swall[x+2],globvis));
        }

        u4 = max(max(y1ve[0],y1ve[1]),max(y1ve[2],y1ve[3]));
        d4 = min(min(y2ve[0],y2ve[1]),min(y2ve[2],y2ve[3]));

        if ((bad > 0) || (u4 >= d4))
        {
            if (!(bad&1)) mvlineasm1(vince[0],palookupoffse[0],y2ve[0]-y1ve[0],vplce[0],bufplce[0],ylookup[y1ve[0]]+p+0);
            if (!(bad&2)) mvlineasm1(vince[1],palookupoffse[1],y2ve[1]-y1ve[1],vplce[1],bufplce[1],ylookup[y1ve[1]]+p+1);
            if (!(bad&4)) mvlineasm1(vince[2],palookupoffse[2],y2ve[2]-y1ve[2],vplce[2],bufplce[2],ylookup[y1ve[2]]+p+2);
            if (!(bad&8)) mvlineasm1(vince[3],palookupoffse[3],y2ve[3]-y1ve[3],vplce[3],bufplce[3],ylookup[y1ve[3]]+p+3);
            continue;
        }

        if (u4 > y1ve[0]) vplce[0] = mvlineasm1(vince[0],palookupoffse[0],u4-y1ve[0]-1,vplce[0],bufplce[0],ylookup[y1ve[0]]+p+0);
        if (u4 > y1ve[1]) vplce[1] = mvlineasm1(vince[1],palookupoffse[1],u4-y1ve[1]-1,vplce[1],bufplce[1],ylookup[y1ve[1]]+p+1);
        if (u4 > y1ve[2]) vplce[2] = mvlineasm1(vince[2],palookupoffse[2],u4-y1ve[2]-1,vplce[2],bufplce[2],ylookup[y1ve[2]]+p+2);
        if (u4 > y1ve[3]) vplce[3] = mvlineasm1(vince[3],palookupoffse[3],u4-y1ve[3]-1,vplce[3],bufplce[3],ylookup[y1ve[3]]+p+3);

        if (d4 >= u4) mvlineasm4(d4-u4+1, (char *)(ylookup[u4]+p));

        pp = p+ylookup[d4+1];
        if (y2ve[0] > d4) mvlineasm1(vince[0],palookupoffse[0],y2ve[0]-d4-1,vplce[0],bufplce[0],pp+0);
        if (y2ve[1] > d4) mvlineasm1(vince[1],palookupoffse[1],y2ve[1]-d4-1,vplce[1],bufplce[1],pp+1);
        if (y2ve[2] > d4) mvlineasm1(vince[2],palookupoffse[2],y2ve[2]-d4-1,vplce[2],bufplce[2],pp+2);
        if (y2ve[3] > d4) mvlineasm1(vince[3],palookupoffse[3],y2ve[3]-d4-1,vplce[3],bufplce[3],pp+3);
    }
#endif

#ifdef NONPOW2_YSIZE_ASM
do_mvlineasm1:
#endif
    for (; x<=x2; x++,p++)
    {
        y1ve[0] = max(uwall[x],startumost[x+windowx1]-windowy1);
        y2ve[0] = min(dwall[x],startdmost[x+windowx1]-windowy1);
        if (y2ve[0] <= y1ve[0]) continue;

        palookupoffse[0] = fpalookup + getpalookupsh(mulscale16(swall[x],globvis));

        calc_bufplc(&bufplce[0], lwall[x], tsizx, tsizy);
        calc_vplcinc(&vplce[0], &vince[0], swall, x, y1ve[0]);

#ifdef NONPOW2_YSIZE_ASM
        if (globalshiftval==0)
            mvlineasm1nonpow2(vince[0],palookupoffse[0],y2ve[0]-y1ve[0]-1,vplce[0],bufplce[0],p+ylookup[y1ve[0]]);
        else
#endif
        mvlineasm1(vince[0],palookupoffse[0],y2ve[0]-y1ve[0]-1,vplce[0],bufplce[0],p+ylookup[y1ve[0]]);
    }

    faketimerhandler();
}


//
// wallfront (internal)
//
int32_t wallfront(int32_t l1, int32_t l2)
{
    walltype *wal;
    int32_t x11, y11, x21, y21, x12, y12, x22, y22, dx, dy, t1, t2;

    wal = &wall[thewall[l1]]; x11 = wal->x; y11 = wal->y;
    wal = &wall[wal->point2]; x21 = wal->x; y21 = wal->y;
    wal = &wall[thewall[l2]]; x12 = wal->x; y12 = wal->y;
    wal = &wall[wal->point2]; x22 = wal->x; y22 = wal->y;

    dx = x21-x11; dy = y21-y11;
    t1 = dmulscale2(x12-x11,dy,-dx,y12-y11); //p1(l2) vs. l1
    t2 = dmulscale2(x22-x11,dy,-dx,y22-y11); //p2(l2) vs. l1
    if (t1 == 0) { t1 = t2; if (t1 == 0) return(-1); }
    if (t2 == 0) t2 = t1;
    if ((t1^t2) >= 0)
    {
        t2 = dmulscale2(globalposx-x11,dy,-dx,globalposy-y11); //pos vs. l1
        return((t2^t1) >= 0);
    }

    dx = x22-x12; dy = y22-y12;
    t1 = dmulscale2(x11-x12,dy,-dx,y11-y12); //p1(l1) vs. l2
    t2 = dmulscale2(x21-x12,dy,-dx,y21-y12); //p2(l1) vs. l2
    if (t1 == 0) { t1 = t2; if (t1 == 0) return(-1); }
    if (t2 == 0) t2 = t1;
    if ((t1^t2) >= 0)
    {
        t2 = dmulscale2(globalposx-x12,dy,-dx,globalposy-y12); //pos vs. l2
        return((t2^t1) < 0);
    }
    return(-2);
}


//
// spritewallfront (internal)
//
static inline int32_t spritewallfront(const spritetype *s, int32_t w)
{
    const walltype *const wal = &wall[w];
    const walltype *wal2 = &wall[wal->point2];
    const int32_t x1 = wal->x, y1 = wal->y;

    return (dmulscale32(wal2->x-x1, s->y-y1, -(s->x-x1), wal2->y-y1) >= 0);
}

//
//  spritebehindwall(internal)
//
#if 0
static int32_t spriteobstructswall(spritetype *s, int32_t w)
{
    walltype *wal;
    int32_t x, y;
    int32_t x1, y1;
    int32_t x2, y2;
    double a1, b1, c1;
    double a2, b2, c2;
    double d1, d2;

    // wall line equation
    wal = &wall[w]; x1 = wal->x - globalposx; y1 = wal->y - globalposy;
    wal = &wall[wal->point2]; x2 = wal->x - globalposx; y2 = wal->y - globalposy;
    if ((x2 - x1) != 0)
        a1 = (float)(y2 - y1)/(x2 - x1);
    else
        a1 = 1e+37; // not infinite, but almost ;)
    b1 = -1;
    c1 = (y1 - (a1 * x1));

    // player to sprite line equation
    if ((s->x - globalposx) != 0)
        a2 = (float)(s->y - globalposy)/(s->x - globalposx);
    else
        a2 = 1e+37;
    b2 = -1;
    c2 = 0;

    // intersection point
    d1 = (float)(1) / (a1*b2 - a2*b1);
    x = ((b1*c2 - b2*c1) * d1);
    y = ((a2*c1 - a1*c2) * d1);

    // distance between the sprite and the player
    a1 = s->x - globalposx;
    b1 = s->y - globalposy;
    d1 = (a1 * a1 + b1 * b1);

    // distance between the intersection point and the player
    d2 = (x * x + y * y);

    // check if the sprite obstructs the wall
    if ((d1 < d2) && (min(x1, x2) <= x) && (x <= max(x1, x2)) && (min(y1, y2) <= y) && (y <= max(y1, y2)))
        return (1);
    else
        return (0);
}
#endif
//
// bunchfront (internal)
//
static inline int32_t bunchfront(int32_t b1, int32_t b2)
{
    int32_t x1b1, x2b1, x1b2, x2b2, b1f, b2f, i;

    b1f = bunchfirst[b1]; x1b1 = xb1[b1f]; x2b2 = xb2[bunchlast[b2]]+1;
    if (x1b1 >= x2b2) return(-1);
    b2f = bunchfirst[b2]; x1b2 = xb1[b2f]; x2b1 = xb2[bunchlast[b1]]+1;
    if (x1b2 >= x2b1) return(-1);

    if (x1b1 >= x1b2)
    {
        for (i=b2f; xb2[i]<x1b1; i=p2[i]);
        return(wallfront(b1f,i));
    }
    for (i=b1f; xb2[i]<x1b2; i=p2[i]);
    return(wallfront(i,b2f));
}


//
// hline (internal)
//
static inline void hline(int32_t xr, int32_t yp)
{
    int32_t xl, r, s;

    xl = lastx[yp]; if (xl > xr) return;
    r = horizlookup2[yp-globalhoriz+horizycent];
    asm1 = (int64_t)globalx1*r;
    asm2 = (int64_t)globaly2*r;
    s = getpalookupsh(mulscale16(r,globvis));

    hlineasm4(xr-xl,0,s,(uint32_t)globalx2*r+globalypanning,(uint32_t)globaly1*r+globalxpanning,
              ylookup[yp]+xr+frameoffset);
}


//
// slowhline (internal)
//
static inline void slowhline(int32_t xr, int32_t yp)
{
    int32_t xl, r;

    xl = lastx[yp]; if (xl > xr) return;
    r = horizlookup2[yp-globalhoriz+horizycent];
    asm1 = (int64_t)globalx1*r;
    asm2 = (int64_t)globaly2*r;

    asm3 = (intptr_t)globalpalwritten + getpalookupsh(mulscale16(r,globvis));
    if (!(globalorientation&256))
    {
        mhline(globalbufplc,(uint32_t)globaly1*r+globalxpanning-asm1*(xr-xl),(xr-xl)<<16,0L,
               (uint32_t)globalx2*r+globalypanning-asm2*(xr-xl),ylookup[yp]+xl+frameoffset);
        return;
    }
    thline(globalbufplc,(uint32_t)globaly1*r+globalxpanning-asm1*(xr-xl),(xr-xl)<<16,0L,
           (uint32_t)globalx2*r+globalypanning-asm2*(xr-xl),ylookup[yp]+xl+frameoffset);
}


//
// prepwall (internal)
//
static void prepwall(int32_t z, const walltype *wal)
{
    int32_t l=0, ol=0, x;

    int32_t walxrepeat = (wal->xrepeat<<3);

    //lwall calculation
    int32_t tmpx = xb1[z]-halfxdimen;

    const int32_t topinc = -(ry1[z]>>2);
    const int32_t botinc = (ry2[z]-ry1[z])>>8;
    int32_t top = mulscale5(rx1[z],xdimen) + mulscale2(topinc,tmpx);
    int32_t bot = mulscale11(rx1[z]-rx2[z],xdimen) + mulscale2(botinc,tmpx);

    const int32_t splc = mulscale19(ry1[z],xdimscale);
    const int32_t sinc = mulscale16(ry2[z]-ry1[z],xdimscale);

    x = xb1[z];
    if (bot != 0)
    {
        l = divscale12(top,bot);
        swall[x] = mulscale21(l,sinc)+splc;
        l *= walxrepeat;
        lwall[x] = (l>>18);
    }
    while (x+4 <= xb2[z])
    {
        int32_t i;

        top += topinc; bot += botinc;
        if (bot != 0)
        {
            ol = l; l = divscale12(top,bot);
            swall[x+4] = mulscale21(l,sinc)+splc;
            l *= walxrepeat;
            lwall[x+4] = (l>>18);
        }

        i = (ol+l)>>1;

        lwall[x+2] = i>>18;
        lwall[x+1] = (ol+i)>>19;
        lwall[x+3] = (l+i)>>19;

        swall[x+2] = (swall[x]+swall[x+4])>>1;
        swall[x+1] = (swall[x]+swall[x+2])>>1;
        swall[x+3] = (swall[x+4]+swall[x+2])>>1;

        x += 4;
    }
    if (x+2 <= xb2[z])
    {
        top += (topinc>>1); bot += (botinc>>1);
        if (bot != 0)
        {
            ol = l; l = divscale12(top,bot);
            swall[x+2] = mulscale21(l,sinc)+splc;
            l *= walxrepeat;
            lwall[x+2] = (l>>18);
        }
        lwall[x+1] = (l+ol)>>19;
        swall[x+1] = (swall[x]+swall[x+2])>>1;
        x += 2;
    }
    if (x+1 <= xb2[z])
    {
        bot += (botinc>>2);
        if (bot != 0)
        {
            l = divscale12(top+(topinc>>2),bot);
            swall[x+1] = mulscale21(l,sinc)+splc;
            lwall[x+1] = mulscale18(l,walxrepeat);
        }
    }

    if (lwall[xb1[z]] < 0)
        lwall[xb1[z]] = 0;
    if (lwall[xb2[z]] >= walxrepeat && walxrepeat)
        lwall[xb2[z]] = walxrepeat-1;

    if (wal->cstat&8)
    {
        walxrepeat--;
        for (x=xb1[z]; x<=xb2[z]; x++)
            lwall[x] = walxrepeat-lwall[x];
    }
}


//
// animateoffs (internal)
//
int32_t animateoffs(int16_t tilenum, int16_t fakevar)
{
    int32_t i, k, offs=0, animnum=picanm[tilenum].num;

    UNREFERENCED_PARAMETER(fakevar);

    i = totalclocklock>>(picanm[tilenum].sf&PICANM_ANIMSPEED_MASK);

    if (picanm[tilenum].num > 0)
    {
        switch (picanm[tilenum].sf&PICANM_ANIMTYPE_MASK)
        {
        case PICANM_ANIMTYPE_OSC:
            k = (i%(animnum<<1));
            if (k < animnum)
                offs = k;
            else
                offs = (animnum<<1)-k;
            break;
        case PICANM_ANIMTYPE_FWD:
            offs = i%(animnum+1);
            break;
        case PICANM_ANIMTYPE_BACK:
            offs = -(i%(animnum+1));
            break;
        }
    }

    return(offs);
}


//
// owallmost (internal)
//
static int32_t owallmost(int16_t *mostbuf, int32_t w, int32_t z)
{
    int32_t bad, inty, xcross, y, yinc;
    int32_t s1, s2, s3, s4, ix1, ix2, iy1, iy2, t;
    int32_t i, tmp;

    z <<= 7;
    s1 = mulscale20(globaluclip,yb1[w]); s2 = mulscale20(globaluclip,yb2[w]);
    s3 = mulscale20(globaldclip,yb1[w]); s4 = mulscale20(globaldclip,yb2[w]);
    bad = (z<s1)+((z<s2)<<1)+((z>s3)<<2)+((z>s4)<<3);

    ix1 = xb1[w]; iy1 = yb1[w];
    ix2 = xb2[w]; iy2 = yb2[w];

    if ((bad&3) == 3)
    {
        //clearbufbyte(&mostbuf[ix1],(ix2-ix1+1)*sizeof(mostbuf[0]),0L);
        for (i=ix1; i<=ix2; i++) mostbuf[i] = 0;
        return(bad);
    }

    if ((bad&12) == 12)
    {
        //clearbufbyte(&mostbuf[ix1],(ix2-ix1+1)*sizeof(mostbuf[0]),ydimen+(ydimen<<16));
        for (i=ix1; i<=ix2; i++) mostbuf[i] = ydimen;
        return(bad);
    }

    if (bad&3)
    {
        t = divscale30(z-s1,s2-s1);
        inty = yb1[w] + mulscale30(yb2[w]-yb1[w],t);
        xcross = xb1[w] + scale(mulscale30(yb2[w],t),xb2[w]-xb1[w],inty);

        if ((bad&3) == 2)
        {
            if (xb1[w] <= xcross) { iy2 = inty; ix2 = xcross; }
            //clearbufbyte(&mostbuf[xcross+1],(xb2[w]-xcross)*sizeof(mostbuf[0]),0L);
            for (i=xcross+1; i<=xb2[w]; i++) mostbuf[i] = 0;
        }
        else
        {
            if (xcross <= xb2[w]) { iy1 = inty; ix1 = xcross; }
            //clearbufbyte(&mostbuf[xb1[w]],(xcross-xb1[w]+1)*sizeof(mostbuf[0]),0L);
            for (i=xb1[w]; i<=xcross; i++) mostbuf[i] = 0;
        }
    }

    if (bad&12)
    {
        t = divscale30(z-s3,s4-s3);
        inty = yb1[w] + mulscale30(yb2[w]-yb1[w],t);
        xcross = xb1[w] + scale(mulscale30(yb2[w],t),xb2[w]-xb1[w],inty);

        if ((bad&12) == 8)
        {
            if (xb1[w] <= xcross) { iy2 = inty; ix2 = xcross; }
            //clearbufbyte(&mostbuf[xcross+1],(xb2[w]-xcross)*sizeof(mostbuf[0]),ydimen+(ydimen<<16));
            for (i=xcross+1; i<=xb2[w]; i++) mostbuf[i] = ydimen;
        }
        else
        {
            if (xcross <= xb2[w]) { iy1 = inty; ix1 = xcross; }
            //clearbufbyte(&mostbuf[xb1[w]],(xcross-xb1[w]+1)*sizeof(mostbuf[0]),ydimen+(ydimen<<16));
            for (i=xb1[w]; i<=xcross; i++) mostbuf[i] = ydimen;
        }
    }

    y = (scale(z,xdimenscale,iy1)<<4);

//// enable for paranoia:
//    ix1 = clamp(ix1, 0, xres-1);
//    ix2 = clamp(ix2, 0, xres-1);
//    if (ix2-ix1 < 0)
//        swaplong(&ix1, &ix2);

    // PK 20110423: a bit consistency checking is a good thing:
    tmp = (ix2-ix1 >= 0) ? (ix2-ix1+1) : 1;
    yinc = ((scale(z,xdimenscale,iy2)<<4)-y) / tmp;
    qinterpolatedown16short((intptr_t)&mostbuf[ix1],tmp,y+(globalhoriz<<16),yinc);

    if (mostbuf[ix1] < 0) mostbuf[ix1] = 0;
    if (mostbuf[ix1] > ydimen) mostbuf[ix1] = ydimen;
    if (mostbuf[ix2] < 0) mostbuf[ix2] = 0;
    if (mostbuf[ix2] > ydimen) mostbuf[ix2] = ydimen;

    return(bad);
}


//
// wallmost (internal)
//
static int32_t wallmost(int16_t *mostbuf, int32_t w, int32_t sectnum, char dastat)
{
    int32_t bad, i, j, t, y, z, inty, intz, xcross, yinc, fw;
    int32_t x1, y1, z1, x2, y2, z2, xv, yv, dx, dy, dasqr, oz1, oz2;
    int32_t s1, s2, s3, s4, ix1, ix2, iy1, iy2;
    int32_t tmp;
    //char datempbuf[256];

    if (dastat == 0)
    {
        z = sector[sectnum].ceilingz-globalposz;
        if ((sector[sectnum].ceilingstat&2) == 0) return(owallmost(mostbuf,w,z));
    }
    else
    {
        z = sector[sectnum].floorz-globalposz;
        if ((sector[sectnum].floorstat&2) == 0) return(owallmost(mostbuf,w,z));
    }

    i = thewall[w];
    if (i == sector[sectnum].wallptr) return(owallmost(mostbuf,w,z));

    x1 = wall[i].x; x2 = wall[wall[i].point2].x-x1;
    y1 = wall[i].y; y2 = wall[wall[i].point2].y-y1;

    fw = sector[sectnum].wallptr; i = wall[fw].point2;
    dx = wall[i].x-wall[fw].x; dy = wall[i].y-wall[fw].y;
    dasqr = krecipasm(nsqrtasm(uhypsq(dx,dy)));

    if (xb1[w] == 0)
        { xv = cosglobalang+sinviewingrangeglobalang; yv = singlobalang-cosviewingrangeglobalang; }
    else
        { xv = x1-globalposx; yv = y1-globalposy; }
    i = xv*(y1-globalposy)-yv*(x1-globalposx); j = yv*x2-xv*y2;
    if (klabs(j) > klabs(i>>3)) i = divscale28(i,j);
    if (dastat == 0)
    {
        t = mulscale15(sector[sectnum].ceilingheinum,dasqr);
        z1 = sector[sectnum].ceilingz;
    }
    else
    {
        t = mulscale15(sector[sectnum].floorheinum,dasqr);
        z1 = sector[sectnum].floorz;
    }
    z1 = dmulscale24(dx*t,mulscale20(y2,i)+((y1-wall[fw].y)<<8),
                     -dy*t,mulscale20(x2,i)+((x1-wall[fw].x)<<8))+((z1-globalposz)<<7);


    if (xb2[w] == xdimen-1)
        { xv = cosglobalang-sinviewingrangeglobalang; yv = singlobalang+cosviewingrangeglobalang; }
    else
        { xv = (x2+x1)-globalposx; yv = (y2+y1)-globalposy; }
    // XXX: OVERFLOW with huge sectors and sloped ceilngs/floors!
    i = xv*(y1-globalposy)-yv*(x1-globalposx); j = yv*x2-xv*y2;
    if (klabs(j) > klabs(i>>3)) i = divscale28(i,j);
    if (dastat == 0)
    {
        t = mulscale15(sector[sectnum].ceilingheinum,dasqr);
        z2 = sector[sectnum].ceilingz;
    }
    else
    {
        t = mulscale15(sector[sectnum].floorheinum,dasqr);
        z2 = sector[sectnum].floorz;
    }
    z2 = dmulscale24(dx*t,mulscale20(y2,i)+((y1-wall[fw].y)<<8),
                     -dy*t,mulscale20(x2,i)+((x1-wall[fw].x)<<8))+((z2-globalposz)<<7);


    s1 = mulscale20(globaluclip,yb1[w]); s2 = mulscale20(globaluclip,yb2[w]);
    s3 = mulscale20(globaldclip,yb1[w]); s4 = mulscale20(globaldclip,yb2[w]);
    bad = (z1<s1)+((z2<s2)<<1)+((z1>s3)<<2)+((z2>s4)<<3);

    ix1 = xb1[w]; ix2 = xb2[w];
    iy1 = yb1[w]; iy2 = yb2[w];
    oz1 = z1; oz2 = z2;

    if ((bad&3) == 3)
    {
        //clearbufbyte(&mostbuf[ix1],(ix2-ix1+1)*sizeof(mostbuf[0]),0L);
        for (i=ix1; i<=ix2; i++) mostbuf[i] = 0;
        return(bad);
    }

    if ((bad&12) == 12)
    {
        //clearbufbyte(&mostbuf[ix1],(ix2-ix1+1)*sizeof(mostbuf[0]),ydimen+(ydimen<<16));
        for (i=ix1; i<=ix2; i++) mostbuf[i] = ydimen;
        return(bad);
    }

    if (bad&3)
    {
        //inty = intz / (globaluclip>>16)
        t = divscale30(oz1-s1,s2-s1+oz1-oz2);
        inty = yb1[w] + mulscale30(yb2[w]-yb1[w],t);
        intz = oz1 + mulscale30(oz2-oz1,t);
        xcross = xb1[w] + scale(mulscale30(yb2[w],t),xb2[w]-xb1[w],inty);

        //t = divscale30((x1<<4)-xcross*yb1[w],xcross*(yb2[w]-yb1[w])-((x2-x1)<<4));
        //inty = yb1[w] + mulscale30(yb2[w]-yb1[w],t);
        //intz = z1 + mulscale30(z2-z1,t);

        if ((bad&3) == 2)
        {
            if (xb1[w] <= xcross) { z2 = intz; iy2 = inty; ix2 = xcross; }
            //clearbufbyte(&mostbuf[xcross+1],(xb2[w]-xcross)*sizeof(mostbuf[0]),0L);
            for (i=xcross+1; i<=xb2[w]; i++) mostbuf[i] = 0;
        }
        else
        {
            if (xcross <= xb2[w]) { z1 = intz; iy1 = inty; ix1 = xcross; }
            //clearbufbyte(&mostbuf[xb1[w]],(xcross-xb1[w]+1)*sizeof(mostbuf[0]),0L);
            for (i=xb1[w]; i<=xcross; i++) mostbuf[i] = 0;
        }
    }

    if (bad&12)
    {
        //inty = intz / (globaldclip>>16)
        t = divscale30(oz1-s3,s4-s3+oz1-oz2);
        inty = yb1[w] + mulscale30(yb2[w]-yb1[w],t);
        intz = oz1 + mulscale30(oz2-oz1,t);
        xcross = xb1[w] + scale(mulscale30(yb2[w],t),xb2[w]-xb1[w],inty);

        //t = divscale30((x1<<4)-xcross*yb1[w],xcross*(yb2[w]-yb1[w])-((x2-x1)<<4));
        //inty = yb1[w] + mulscale30(yb2[w]-yb1[w],t);
        //intz = z1 + mulscale30(z2-z1,t);

        if ((bad&12) == 8)
        {
            if (xb1[w] <= xcross) { z2 = intz; iy2 = inty; ix2 = xcross; }
            //clearbufbyte(&mostbuf[xcross+1],(xb2[w]-xcross)*sizeof(mostbuf[0]),ydimen+(ydimen<<16));
            for (i=xcross+1; i<=xb2[w]; i++) mostbuf[i] = ydimen;
        }
        else
        {
            if (xcross <= xb2[w]) { z1 = intz; iy1 = inty; ix1 = xcross; }
            //clearbufbyte(&mostbuf[xb1[w]],(xcross-xb1[w]+1)*sizeof(mostbuf[0]),ydimen+(ydimen<<16));
            for (i=xb1[w]; i<=xcross; i++) mostbuf[i] = ydimen;
        }
    }

    y = (scale(z1,xdimenscale,iy1)<<4);

//// enable for paranoia:
//    ix1 = clamp(ix1, 0, xres-1);
//    ix2 = clamp(ix2, 0, xres-1);
//    if (ix2-ix1 < 0)
//        swaplong(&ix1, &ix2);

    // PK 20110423: a bit consistency checking is a good thing:
    tmp = (ix2-ix1 >= 0) ? (ix2-ix1+1) : 1;
    yinc = ((scale(z2,xdimenscale,iy2)<<4)-y) / tmp;
    qinterpolatedown16short((intptr_t)&mostbuf[ix1],tmp,y+(globalhoriz<<16),yinc);

    if (mostbuf[ix1] < 0) mostbuf[ix1] = 0;
    if (mostbuf[ix1] > ydimen) mostbuf[ix1] = ydimen;
    if (mostbuf[ix2] < 0) mostbuf[ix2] = 0;
    if (mostbuf[ix2] > ydimen) mostbuf[ix2] = ydimen;

    return(bad);
}

// globalpicnum --> globalxshift, globalyshift
static void calc_globalshifts(void)
{
    globalxshift = (8-(picsiz[globalpicnum]&15));
    globalyshift = (8-(picsiz[globalpicnum]>>4));
    if (globalorientation&8) { globalxshift++; globalyshift++; }
    // PK: the following can happen for large (>= 512) tile sizes.
    // NOTE that global[xy]shift are unsigned chars.
    if (globalxshift > 31) globalxshift=0;
    if (globalyshift > 31) globalyshift=0;
}

static int32_t setup_globals_cf1(const sectortype *sec, int32_t pal, int32_t zd,
                                 int32_t picnum, int32_t shade, int32_t stat,
                                 int32_t xpanning, int32_t ypanning, int32_t x1)
{
    int32_t i, j, ox, oy;

    if (palookup[pal] != globalpalwritten)
    {
        globalpalwritten = palookup[pal];
        if (!globalpalwritten) globalpalwritten = palookup[globalpal];  // JBF: fixes null-pointer crash
        setpalookupaddress(globalpalwritten);
    }

    globalzd = zd;
    if (globalzd > 0) return 1;

    globalpicnum = picnum;
    if ((unsigned)globalpicnum >= MAXTILES) globalpicnum = 0;
    setgotpic(globalpicnum);
    if ((tilesizx[globalpicnum] <= 0) || (tilesizy[globalpicnum] <= 0)) return 1;
    DO_TILE_ANIM(globalpicnum, 0);

    if (waloff[globalpicnum] == 0) loadtile(globalpicnum);
    globalbufplc = waloff[globalpicnum];

    globalshade = shade;
    globvis = globalcisibility;
    if (sec->visibility != 0) globvis = mulscale4(globvis, (uint8_t)(sec->visibility+16));
    globalorientation = stat;

    if ((globalorientation&64) == 0)
    {
        globalx1 = singlobalang; globalx2 = singlobalang;
        globaly1 = cosglobalang; globaly2 = cosglobalang;
        globalxpanning = ((int64_t)globalposx<<20);
        globalypanning = -((int64_t)globalposy<<20);
    }
    else
    {
        j = sec->wallptr;
        ox = wall[wall[j].point2].x - wall[j].x;
        oy = wall[wall[j].point2].y - wall[j].y;
        i = nsqrtasm(uhypsq(ox,oy)); if (i == 0) i = 1024; else i = 1048576/i;
        globalx1 = mulscale10(dmulscale10(ox,singlobalang,-oy,cosglobalang),i);
        globaly1 = mulscale10(dmulscale10(ox,cosglobalang,oy,singlobalang),i);
        globalx2 = -globalx1;
        globaly2 = -globaly1;

        ox = ((wall[j].x-globalposx)<<6); oy = ((wall[j].y-globalposy)<<6);
        i = dmulscale14(oy,cosglobalang,-ox,singlobalang);
        j = dmulscale14(ox,cosglobalang,oy,singlobalang);
        ox = i; oy = j;
        globalxpanning = (int64_t)globalx1*ox - (int64_t)globaly1*oy;
        globalypanning = (int64_t)globaly2*ox + (int64_t)globalx2*oy;
    }
    globalx2 = mulscale16(globalx2,viewingrangerecip);
    globaly1 = mulscale16(globaly1,viewingrangerecip);

    calc_globalshifts();

    if ((globalorientation&0x4) > 0)
    {
        i = globalxpanning; globalxpanning = globalypanning; globalypanning = i;
        i = globalx2; globalx2 = -globaly1; globaly1 = -i;
        i = globalx1; globalx1 = globaly2; globaly2 = i;
    }
    if ((globalorientation&0x10) > 0) globalx1 = -globalx1, globaly1 = -globaly1, globalxpanning = -(int64_t)globalxpanning;
    if ((globalorientation&0x20) > 0) globalx2 = -globalx2, globaly2 = -globaly2, globalypanning = -(int64_t)globalypanning;
    globalx1 <<= globalxshift; globaly1 <<= globalxshift;
    globalx2 <<= globalyshift;  globaly2 <<= globalyshift;
    globalxpanning <<= globalxshift; globalypanning <<= globalyshift;
    globalxpanning = (uint32_t)globalxpanning + (xpanning<<24);
    globalypanning = (uint32_t)globalypanning + (ypanning<<24);
    globaly1 = (-globalx1-globaly1)*halfxdimen;
    globalx2 = (globalx2-globaly2)*halfxdimen;

    sethlinesizes(picsiz[globalpicnum]&15,picsiz[globalpicnum]>>4,globalbufplc);

    globalx2 += globaly2*(x1-1);
    globaly1 += globalx1*(x1-1);
    globalx1 = mulscale16(globalx1,globalzd);
    globalx2 = mulscale16(globalx2,globalzd);
    globaly1 = mulscale16(globaly1,globalzd);
    globaly2 = mulscale16(globaly2,globalzd);
    globvis = klabs(mulscale10(globvis,globalzd));

    return 0;
}

//
// ceilscan (internal)
//
static void ceilscan(int32_t x1, int32_t x2, int32_t sectnum)
{
    int32_t x, y1, y2;
    int32_t twall, bwall;
    const sectortype *sec = &sector[sectnum];

    if (setup_globals_cf1(sec, sec->ceilingpal, sec->ceilingz-globalposz,
                          sec->ceilingpicnum, sec->ceilingshade, sec->ceilingstat,
                          sec->ceilingxpanning, sec->ceilingypanning, x1))
        return;

    if (!(globalorientation&0x180))
    {
        y1 = umost[x1]; y2 = y1;
        for (x=x1; x<=x2; x++)
        {
            twall = umost[x]-1; bwall = min(uplc[x],dmost[x]);
            if (twall < bwall-1)
            {
                if (twall >= y2)
                {
                    while (y1 < y2-1) hline(x-1,++y1);
                    y1 = twall;
                }
                else
                {
                    while (y1 < twall) hline(x-1,++y1);
                    while (y1 > twall) lastx[y1--] = x;
                }
                while (y2 > bwall) hline(x-1,--y2);
                while (y2 < bwall) lastx[y2++] = x;
            }
            else
            {
                while (y1 < y2-1) hline(x-1,++y1);
                if (x == x2) { globalx2 += globaly2; globaly1 += globalx1; break; }
                y1 = umost[x+1]; y2 = y1;
            }
            globalx2 += globaly2; globaly1 += globalx1;
        }
        while (y1 < y2-1) hline(x2,++y1);
        faketimerhandler();
        return;
    }

    switch (globalorientation&0x180)
    {
    case 128:
        msethlineshift(picsiz[globalpicnum]&15,picsiz[globalpicnum]>>4);
        break;
    case 256:
        settransnormal();
        tsethlineshift(picsiz[globalpicnum]&15,picsiz[globalpicnum]>>4);
        break;
    case 384:
        settransreverse();
        tsethlineshift(picsiz[globalpicnum]&15,picsiz[globalpicnum]>>4);
        break;
    }

    y1 = umost[x1]; y2 = y1;
    for (x=x1; x<=x2; x++)
    {
        twall = umost[x]-1; bwall = min(uplc[x],dmost[x]);
        if (twall < bwall-1)
        {
            if (twall >= y2)
            {
                while (y1 < y2-1) slowhline(x-1,++y1);
                y1 = twall;
            }
            else
            {
                while (y1 < twall) slowhline(x-1,++y1);
                while (y1 > twall) lastx[y1--] = x;
            }
            while (y2 > bwall) slowhline(x-1,--y2);
            while (y2 < bwall) lastx[y2++] = x;
        }
        else
        {
            while (y1 < y2-1) slowhline(x-1,++y1);
            if (x == x2) { globalx2 += globaly2; globaly1 += globalx1; break; }
            y1 = umost[x+1]; y2 = y1;
        }
        globalx2 += globaly2; globaly1 += globalx1;
    }
    while (y1 < y2-1) slowhline(x2,++y1);
    faketimerhandler();
}


//
// florscan (internal)
//
static void florscan(int32_t x1, int32_t x2, int32_t sectnum)
{
     int32_t x, y1, y2;
     int32_t twall, bwall;
     const sectortype *sec = &sector[sectnum];

     if (setup_globals_cf1(sec, sec->floorpal, globalposz-sec->floorz,
                           sec->floorpicnum, sec->floorshade, sec->floorstat,
                           sec->floorxpanning, sec->floorypanning, x1))
         return;

    if (!(globalorientation&0x180))
    {
        y1 = max(dplc[x1],umost[x1]); y2 = y1;
        for (x=x1; x<=x2; x++)
        {
            twall = max(dplc[x],umost[x])-1; bwall = dmost[x];
            if (twall < bwall-1)
            {
                if (twall >= y2)
                {
                    while (y1 < y2-1) hline(x-1,++y1);
                    y1 = twall;
                }
                else
                {
                    while (y1 < twall) hline(x-1,++y1);
                    while (y1 > twall) lastx[y1--] = x;
                }
                while (y2 > bwall) hline(x-1,--y2);
                while (y2 < bwall) lastx[y2++] = x;
            }
            else
            {
                while (y1 < y2-1) hline(x-1,++y1);
                if (x == x2) { globalx2 += globaly2; globaly1 += globalx1; break; }
                y1 = max(dplc[x+1],umost[x+1]); y2 = y1;
            }
            globalx2 += globaly2; globaly1 += globalx1;
        }
        while (y1 < y2-1) hline(x2,++y1);
        faketimerhandler();
        return;
    }

    switch (globalorientation&0x180)
    {
    case 128:
        msethlineshift(picsiz[globalpicnum]&15,picsiz[globalpicnum]>>4);
        break;
    case 256:
        settransnormal();
        tsethlineshift(picsiz[globalpicnum]&15,picsiz[globalpicnum]>>4);
        break;
    case 384:
        settransreverse();
        tsethlineshift(picsiz[globalpicnum]&15,picsiz[globalpicnum]>>4);
        break;
    }

    y1 = max(dplc[x1],umost[x1]); y2 = y1;
    for (x=x1; x<=x2; x++)
    {
        twall = max(dplc[x],umost[x])-1; bwall = dmost[x];
        if (twall < bwall-1)
        {
            if (twall >= y2)
            {
                while (y1 < y2-1) slowhline(x-1,++y1);
                y1 = twall;
            }
            else
            {
                while (y1 < twall) slowhline(x-1,++y1);
                while (y1 > twall) lastx[y1--] = x;
            }
            while (y2 > bwall) slowhline(x-1,--y2);
            while (y2 < bwall) lastx[y2++] = x;
        }
        else
        {
            while (y1 < y2-1) slowhline(x-1,++y1);
            if (x == x2) { globalx2 += globaly2; globaly1 += globalx1; break; }
            y1 = max(dplc[x+1],umost[x+1]); y2 = y1;
        }
        globalx2 += globaly2; globaly1 += globalx1;
    }
    while (y1 < y2-1) slowhline(x2,++y1);
    faketimerhandler();
}


//
// wallscan (internal)
//
static void wallscan(int32_t x1, int32_t x2,
                     const int16_t *uwal, const int16_t *dwal,
                     const int32_t *swal, const int32_t *lwal)
{
    int32_t x;
    intptr_t fpalookup;
    int32_t y1ve[4], y2ve[4], tsizx, tsizy;
#ifdef MULTI_COLUMN_VLINE
    char bad;
    int32_t u4, d4, z;
    uintptr_t p;
#endif

#ifdef YAX_ENABLE
    if (g_nodraw)
        return;
#endif
    setgotpic(globalpicnum);
    if (globalshiftval < 0)
        return;

    if (x2 >= xdim) x2 = xdim-1;

    tsizx = tilesizx[globalpicnum];
    tsizy = tilesizy[globalpicnum];
    if ((tsizx <= 0) || (tsizy <= 0)) return;
    if ((uwal[x1] > ydimen) && (uwal[x2] > ydimen)) return;
    if ((dwal[x1] < 0) && (dwal[x2] < 0)) return;

    if (waloff[globalpicnum] == 0) loadtile(globalpicnum);

    tweak_tsizes(&tsizx, &tsizy);

    fpalookup = FP_OFF(palookup[globalpal]);

    setupvlineasm(globalshiftval);


    x = x1;
    while ((umost[x] > dmost[x]) && (x <= x2)) x++;

#ifdef NONPOW2_YSIZE_ASM
    if (globalshiftval==0)
        goto do_vlineasm1;
#endif

#ifdef MULTI_COLUMN_VLINE
    for (; (x<=x2)&&((x+frameoffset)&3); x++)
    {
        y1ve[0] = max(uwal[x],umost[x]);
        y2ve[0] = min(dwal[x],dmost[x]);
        if (y2ve[0] <= y1ve[0]) continue;

        palookupoffse[0] = fpalookup + getpalookupsh(mulscale16(swal[x],globvis));

        calc_bufplc(&bufplce[0], lwal[x], tsizx, tsizy);
        calc_vplcinc(&vplce[0], &vince[0], swal, x, y1ve[0]);

        vlineasm1(vince[0],palookupoffse[0],y2ve[0]-y1ve[0]-1,vplce[0],bufplce[0],x+frameoffset+ylookup[y1ve[0]]);
    }
    for (; x<=x2-3; x+=4)
    {
        bad = 0;
        for (z=3; z>=0; z--)
        {
            y1ve[z] = max(uwal[x+z],umost[x+z]);
            y2ve[z] = min(dwal[x+z],dmost[x+z])-1;
            if (y2ve[z] < y1ve[z]) { bad += pow2char[z]; continue; }

            calc_bufplc(&bufplce[z], lwal[x+z], tsizx, tsizy);
            calc_vplcinc(&vplce[z], &vince[z], swal, x+z, y1ve[z]);
        }
        if (bad == 15) continue;

        palookupoffse[0] = fpalookup + getpalookupsh(mulscale16(swal[x],globvis));
        palookupoffse[3] = fpalookup + getpalookupsh(mulscale16(swal[x+3],globvis));

        if ((palookupoffse[0] == palookupoffse[3]) && ((bad&0x9) == 0))
        {
            palookupoffse[1] = palookupoffse[0];
            palookupoffse[2] = palookupoffse[0];
        }
        else
        {
            palookupoffse[1] = fpalookup + getpalookupsh(mulscale16(swal[x+1],globvis));
            palookupoffse[2] = fpalookup + getpalookupsh(mulscale16(swal[x+2],globvis));
        }

        u4 = max(max(y1ve[0],y1ve[1]),max(y1ve[2],y1ve[3]));
        d4 = min(min(y2ve[0],y2ve[1]),min(y2ve[2],y2ve[3]));

        if ((bad != 0) || (u4 >= d4))
        {
            if (!(bad&1)) prevlineasm1(vince[0],palookupoffse[0],y2ve[0]-y1ve[0],vplce[0],bufplce[0],ylookup[y1ve[0]]+x+frameoffset+0);
            if (!(bad&2)) prevlineasm1(vince[1],palookupoffse[1],y2ve[1]-y1ve[1],vplce[1],bufplce[1],ylookup[y1ve[1]]+x+frameoffset+1);
            if (!(bad&4)) prevlineasm1(vince[2],palookupoffse[2],y2ve[2]-y1ve[2],vplce[2],bufplce[2],ylookup[y1ve[2]]+x+frameoffset+2);
            if (!(bad&8)) prevlineasm1(vince[3],palookupoffse[3],y2ve[3]-y1ve[3],vplce[3],bufplce[3],ylookup[y1ve[3]]+x+frameoffset+3);
            continue;
        }

        if (u4 > y1ve[0]) vplce[0] = prevlineasm1(vince[0],palookupoffse[0],u4-y1ve[0]-1,vplce[0],bufplce[0],ylookup[y1ve[0]]+x+frameoffset+0);
        if (u4 > y1ve[1]) vplce[1] = prevlineasm1(vince[1],palookupoffse[1],u4-y1ve[1]-1,vplce[1],bufplce[1],ylookup[y1ve[1]]+x+frameoffset+1);
        if (u4 > y1ve[2]) vplce[2] = prevlineasm1(vince[2],palookupoffse[2],u4-y1ve[2]-1,vplce[2],bufplce[2],ylookup[y1ve[2]]+x+frameoffset+2);
        if (u4 > y1ve[3]) vplce[3] = prevlineasm1(vince[3],palookupoffse[3],u4-y1ve[3]-1,vplce[3],bufplce[3],ylookup[y1ve[3]]+x+frameoffset+3);

        if (d4 >= u4) vlineasm4(d4-u4+1, (char *)(ylookup[u4]+x+frameoffset));

        p = x+frameoffset+ylookup[d4+1];
        if (y2ve[0] > d4) prevlineasm1(vince[0],palookupoffse[0],y2ve[0]-d4-1,vplce[0],bufplce[0],p+0);
        if (y2ve[1] > d4) prevlineasm1(vince[1],palookupoffse[1],y2ve[1]-d4-1,vplce[1],bufplce[1],p+1);
        if (y2ve[2] > d4) prevlineasm1(vince[2],palookupoffse[2],y2ve[2]-d4-1,vplce[2],bufplce[2],p+2);
        if (y2ve[3] > d4) prevlineasm1(vince[3],palookupoffse[3],y2ve[3]-d4-1,vplce[3],bufplce[3],p+3);
    }
#endif

#ifdef NONPOW2_YSIZE_ASM
do_vlineasm1:
#endif
    for (; x<=x2; x++)
    {
        y1ve[0] = max(uwal[x],umost[x]);
        y2ve[0] = min(dwal[x],dmost[x]);
        if (y2ve[0] <= y1ve[0]) continue;

        palookupoffse[0] = fpalookup + getpalookupsh(mulscale16(swal[x],globvis));

        calc_bufplc(&bufplce[0], lwal[x], tsizx, tsizy);
        calc_vplcinc(&vplce[0], &vince[0], swal, x, y1ve[0]);

#ifdef NONPOW2_YSIZE_ASM
        if (globalshiftval==0)
            vlineasm1nonpow2(vince[0],palookupoffse[0],y2ve[0]-y1ve[0]-1,vplce[0],bufplce[0],x+frameoffset+ylookup[y1ve[0]]);
        else
#endif
        vlineasm1(vince[0],palookupoffse[0],y2ve[0]-y1ve[0]-1,vplce[0],bufplce[0],x+frameoffset+ylookup[y1ve[0]]);
    }

    faketimerhandler();
}

//
// transmaskvline (internal)
//
static void transmaskvline(int32_t x)
{
    uint32_t vplc;
    int32_t vinc;
    intptr_t palookupoffs;
    intptr_t bufplc,p;
    int32_t y1v, y2v;

    if ((x < 0) || (x >= xdimen)) return;

    y1v = max(uwall[x],startumost[x+windowx1]-windowy1);
    y2v = min(dwall[x],startdmost[x+windowx1]-windowy1);
    y2v--;
    if (y2v < y1v) return;

    palookupoffs = FP_OFF(palookup[globalpal]) + getpalookupsh(mulscale16(swall[x],globvis));

    calc_bufplc(&bufplc, lwall[x], -tilesizx[globalpicnum], -tilesizy[globalpicnum]);
    calc_vplcinc(&vplc, &vinc, swall, x, y1v);

    p = ylookup[y1v]+x+frameoffset;

#ifdef NONPOW2_YSIZE_ASM
    if (globalshiftval==0)
        tvlineasm1nonpow2(vinc,palookupoffs,y2v-y1v,vplc,bufplc,p);
    else
#endif
    tvlineasm1(vinc,palookupoffs,y2v-y1v,vplc,bufplc,p);
}


//
// transmaskvline2 (internal)
//
#ifdef MULTI_COLUMN_VLINE
static void transmaskvline2(int32_t x)
{
    int32_t y1, y2, x2;
    int32_t y1ve[2], y2ve[2];

    uintptr_t p;

    if ((x < 0) || (x >= xdimen)) return;
    if (x == xdimen-1) { transmaskvline(x); return; }

    x2 = x+1;

    y1ve[0] = max(uwall[x],startumost[x+windowx1]-windowy1);
    y2ve[0] = min(dwall[x],startdmost[x+windowx1]-windowy1)-1;
    if (y2ve[0] < y1ve[0]) { transmaskvline(x2); return; }
    y1ve[1] = max(uwall[x2],startumost[x2+windowx1]-windowy1);
    y2ve[1] = min(dwall[x2],startdmost[x2+windowx1]-windowy1)-1;
    if (y2ve[1] < y1ve[1]) { transmaskvline(x); return; }

    palookupoffse[0] = FP_OFF(palookup[globalpal]) + getpalookupsh(mulscale16(swall[x],globvis));
    palookupoffse[1] = FP_OFF(palookup[globalpal]) + getpalookupsh(mulscale16(swall[x2],globvis));

    setuptvlineasm2(globalshiftval,palookupoffse[0],palookupoffse[1]);

    calc_bufplc(&bufplce[0], lwall[x], -tilesizx[globalpicnum], -tilesizy[globalpicnum]);
    calc_bufplc(&bufplce[1], lwall[x2], -tilesizx[globalpicnum], -tilesizy[globalpicnum]);
    calc_vplcinc(&vplce[0], &vince[0], swall, x, y1ve[0]);
    calc_vplcinc(&vplce[1], &vince[1], swall, x2, y1ve[1]);

    y1 = max(y1ve[0],y1ve[1]);
    y2 = min(y2ve[0],y2ve[1]);

    p = x+frameoffset;

    if (y1ve[0] != y1ve[1])
    {
        if (y1ve[0] < y1)
            vplce[0] = tvlineasm1(vince[0],palookupoffse[0],y1-y1ve[0]-1,vplce[0],bufplce[0],ylookup[y1ve[0]]+p);
        else
            vplce[1] = tvlineasm1(vince[1],palookupoffse[1],y1-y1ve[1]-1,vplce[1],bufplce[1],ylookup[y1ve[1]]+p+1);
    }

    if (y2 > y1)
    {
        asm1 = vince[1];
        asm2 = ylookup[y2]+p+1;
        tvlineasm2(vplce[1],vince[0],bufplce[0],bufplce[1],vplce[0],ylookup[y1]+p);
    }
    else
    {
        asm1 = vplce[0];
        asm2 = vplce[1];
    }

    if (y2ve[0] > y2ve[1])
        tvlineasm1(vince[0],palookupoffse[0],y2ve[0]-y2-1,asm1,bufplce[0],ylookup[y2+1]+p);
    else if (y2ve[0] < y2ve[1])
        tvlineasm1(vince[1],palookupoffse[1],y2ve[1]-y2-1,asm2,bufplce[1],ylookup[y2+1]+p+1);

    faketimerhandler();
}
#endif

//
// transmaskwallscan (internal)
//
static void transmaskwallscan(int32_t x1, int32_t x2, int32_t saturatevplc)
{
    int32_t x;

    setgotpic(globalpicnum);

    Bassert(globalshiftval>=0 || ((tilesizx[globalpicnum] <= 0) || (tilesizy[globalpicnum] <= 0)));
    // globalshiftval<0 implies following condition
    if ((tilesizx[globalpicnum] <= 0) || (tilesizy[globalpicnum] <= 0))
        return;

    if (waloff[globalpicnum] == 0) loadtile(globalpicnum);

    setuptvlineasm(globalshiftval, saturatevplc);

    x = x1;
    while ((startumost[x+windowx1] > startdmost[x+windowx1]) && (x <= x2)) x++;

#ifndef ENGINE_USING_A_C
    if (globalshiftval==0)
    {
        while (x <= x2) transmaskvline(x), x++;
    }
    else
#endif
    {
#ifdef MULTI_COLUMN_VLINE
        if ((x <= x2) && (x&1)) transmaskvline(x), x++;
        while (x < x2) transmaskvline2(x), x += 2;
#endif
        while (x <= x2) transmaskvline(x), x++;
    }

    faketimerhandler();
}


////////// NON-power-of-two replacements for mhline/thline, adapted from a.c //////////
#if defined(__GNUC__) && defined(__i386__) && !defined(NOASM)
// from pragmas.h
# define ourdivscale32(d,b) \
	({ int32_t __d=(d), __b=(b), __r; \
	   __asm__ __volatile__ ("xorl %%eax, %%eax; divl %%ebx" \
		: "=a" (__r), "=d" (__d) : "d" (__d), "b" (__b) : "cc"); \
	 __r; })
#else
# define ourdivscale32(d,b) divscale32(d,b)
#endif

// cntup16>>16 iterations
static void nonpow2_mhline(intptr_t bufplc, uint32_t bx, int32_t cntup16, int32_t junk, uint32_t by, char *p)
{
    char ch;

    const char *const buf = (char *)bufplc;
    const char *const pal = (char *)asm3;

    const uint32_t xdiv = globalxspan > 1 ? (uint32_t)ourdivscale32(1, globalxspan) : UINT32_MAX;
    const uint32_t ydiv = globalyspan > 1 ? (uint32_t)ourdivscale32(1, globalyspan) : UINT32_MAX;
    const uint32_t yspan = globalyspan;
    const int32_t xinc = asm1, yinc = asm2;

    UNREFERENCED_PARAMETER(junk);

    for (cntup16>>=16; cntup16>0; cntup16--)
    {
        ch = buf[(bx/xdiv)*yspan + by/ydiv];

        if (ch != 255) *p = pal[ch];
        bx += xinc;
        by += yinc;
        p++;
    }
}

// cntup16>>16 iterations
static void nonpow2_thline(intptr_t bufplc, uint32_t bx, int32_t cntup16, int32_t junk, uint32_t by, char *p)
{
    char ch;

    const char *const buf = (char *)bufplc;
    const char *const pal = (char *)asm3;
    const char *const trans = transluc;

    const uint32_t xdiv = globalxspan > 1 ? (uint32_t)ourdivscale32(1, globalxspan) : UINT32_MAX;
    const uint32_t ydiv = globalyspan > 1 ? (uint32_t)ourdivscale32(1, globalyspan) : UINT32_MAX;
    const uint32_t yspan = globalyspan;
    const int32_t xinc = asm1, yinc = asm2;

    UNREFERENCED_PARAMETER(junk);

    if (globalorientation&512)
    {
        for (cntup16>>=16; cntup16>0; cntup16--)
        {
            ch = buf[(bx/xdiv)*yspan + by/ydiv];
            if (ch != 255) *p = trans[(*p)|(pal[ch]<<8)];
            bx += xinc;
            by += yinc;
            p++;
        }
    }
    else
    {
        for (cntup16>>=16; cntup16>0; cntup16--)
        {
            ch = buf[(bx/xdiv)*yspan + by/ydiv];
            if (ch != 255) *p = trans[((*p)<<8)|pal[ch]];
            bx += xinc;
            by += yinc;
            p++;
        }
    }
}
////////// END non-power-of-two replacements //////////

//
// ceilspritehline (internal)
//
static inline void ceilspritehline(int32_t x2, int32_t y)
{
    int32_t x1, v, bx, by;

    //x = x1 + (x2-x1)t + (y1-y2)u  ~  x = 160v
    //y = y1 + (y2-y1)t + (x2-x1)u  ~  y = (scrx-160)v
    //z = z1 = z2                   ~  z = posz + (scry-horiz)v

    x1 = lastx[y]; if (x2 < x1) return;

    v = mulscale20(globalzd,horizlookup[y-globalhoriz+horizycent]);
    bx = (uint32_t)mulscale14(globalx2*x1+globalx1,v) + globalxpanning;
    by = (uint32_t)mulscale14(globaly2*x1+globaly1,v) + globalypanning;
    asm1 = mulscale14(globalx2,v);
    asm2 = mulscale14(globaly2,v);

    asm3 = FP_OFF(palookup[globalpal]) + getpalookupsh(mulscale28(klabs(v),globvis));

    if (globalispow2)
    {
        if ((globalorientation&2) == 0)
            mhline(globalbufplc,bx,(x2-x1)<<16,0L,by,ylookup[y]+x1+frameoffset);
        else
            thline(globalbufplc,bx,(x2-x1)<<16,0L,by,ylookup[y]+x1+frameoffset);
    }
    else
    {
        if ((globalorientation&2) == 0)
            nonpow2_mhline(globalbufplc,bx,(x2-x1)<<16,0L,by,(char *)(ylookup[y]+x1+frameoffset));
        else
            nonpow2_thline(globalbufplc,bx,(x2-x1)<<16,0L,by,(char *)(ylookup[y]+x1+frameoffset));
    }
}


//
// ceilspritescan (internal)
//
static inline void ceilspritescan(int32_t x1, int32_t x2)
{
    int32_t x, y1, y2, twall, bwall;

    y1 = uwall[x1]; y2 = y1;
    for (x=x1; x<=x2; x++)
    {
        twall = uwall[x]-1; bwall = dwall[x];
        if (twall < bwall-1)
        {
            if (twall >= y2)
            {
                while (y1 < y2-1) ceilspritehline(x-1,++y1);
                y1 = twall;
            }
            else
            {
                while (y1 < twall) ceilspritehline(x-1,++y1);
                while (y1 > twall) lastx[y1--] = x;
            }
            while (y2 > bwall) ceilspritehline(x-1,--y2);
            while (y2 < bwall) lastx[y2++] = x;
        }
        else
        {
            while (y1 < y2-1) ceilspritehline(x-1,++y1);
            if (x == x2) break;
            y1 = uwall[x+1]; y2 = y1;
        }
    }
    while (y1 < y2-1) ceilspritehline(x2,++y1);
    faketimerhandler();
}

////////// translucent slope vline, based on a-c.c's slopevlin //////////
static int32_t gglogx, gglogy, ggpinc;
static char *ggbuf, *ggpal;

static void setupslopevlin_alsotrans(int32_t logylogx, intptr_t bufplc, int32_t pinc)
{
    setupslopevlin(logylogx, bufplc, pinc);
    gglogx = (logylogx&255); gglogy = (logylogx>>8);
    ggbuf = (char *)bufplc; ggpinc = pinc;
    ggpal = palookup[globalpal] + getpalookupsh(0);
}

// cnt iterations
static void tslopevlin(uint8_t *p, int32_t i, const intptr_t *slopalptr, int32_t cnt, int32_t bx, int32_t by)
{
    const char *const buf = ggbuf;
    const char *const pal = ggpal;
    const char *const trans = transluc;
    const int32_t bzinc = (asm1>>3), pinc = ggpinc;

    const int32_t transmode = (globalorientation&128);
    const uint32_t xtou = globalx3, ytov = globaly3;
    const int32_t logx = gglogx, logy = gglogy;

    int32_t bz = asm3;

    do
    {
        uint8_t ch;
        uint32_t u, v;

        i = krecipasm(bz>>6); bz += bzinc;
        u = bx + xtou*i;
        v = by + ytov*i;
        ch = *(uint8_t *)(slopalptr[0] + buf[((u>>(32-logx))<<logy)+(v>>(32-logy))]);

        if (transmode)
        {
            if (ch != 255) *p = trans[*p|(pal[ch]<<8)];
        }
        else
        {
            if (ch != 255) *p = trans[(*p<<8)|pal[ch]];
        }

        slopalptr--;
        p += pinc;
    }
    while (--cnt);
}

//
// grouscan (internal)
//
#define BITSOFPRECISION 3  //Don't forget to change this in A.ASM also!
static void grouscan(int32_t dax1, int32_t dax2, int32_t sectnum, char dastat)
{
    int32_t i, l, x, y, dx, dy, wx, wy, y1, y2, daz;
    int32_t daslope, dasqr;
    int32_t shoffs, shinc, m1, m2;
    intptr_t *mptr1, *mptr2, *nptr1, *nptr2,j;
    walltype *wal;
    sectortype *sec;

    sec = &sector[sectnum];

    if (dastat == 0)
    {
        if (globalposz <= getceilzofslope(sectnum,globalposx,globalposy))
            return;  //Back-face culling
        globalorientation = sec->ceilingstat;
        globalpicnum = sec->ceilingpicnum;
        globalshade = sec->ceilingshade;
        globalpal = sec->ceilingpal;
        daslope = sec->ceilingheinum;
        daz = sec->ceilingz;
    }
    else
    {
        if (globalposz >= getflorzofslope(sectnum,globalposx,globalposy))
            return;  //Back-face culling
        globalorientation = sec->floorstat;
        globalpicnum = sec->floorpicnum;
        globalshade = sec->floorshade;
        globalpal = sec->floorpal;
        daslope = sec->floorheinum;
        daz = sec->floorz;
    }

    DO_TILE_ANIM(globalpicnum, sectnum);
    setgotpic(globalpicnum);
    if ((tilesizx[globalpicnum] <= 0) || (tilesizy[globalpicnum] <= 0)) return;
    if (waloff[globalpicnum] == 0) loadtile(globalpicnum);

    wal = &wall[sec->wallptr];
    wx = wall[wal->point2].x - wal->x;
    wy = wall[wal->point2].y - wal->y;
    dasqr = krecipasm(nsqrtasm(uhypsq(wx,wy)));
    i = mulscale21(daslope,dasqr);
    wx *= i; wy *= i;

    globalx = -mulscale19(singlobalang,xdimenrecip);
    globaly = mulscale19(cosglobalang,xdimenrecip);
    globalx1 = (globalposx<<8);
    globaly1 = -(globalposy<<8);
    i = (dax1-halfxdimen)*xdimenrecip;
    globalx2 = mulscale16(cosglobalang<<4,viewingrangerecip) - mulscale27(singlobalang,i);
    globaly2 = mulscale16(singlobalang<<4,viewingrangerecip) + mulscale27(cosglobalang,i);
    globalzd = (xdimscale<<9);
    globalzx = -dmulscale17(wx,globaly2,-wy,globalx2) + mulscale10(1-globalhoriz,globalzd);
    globalz = -dmulscale25(wx,globaly,-wy,globalx);

    if (globalorientation&64)  //Relative alignment
    {
        dx = mulscale14(wall[wal->point2].x-wal->x,dasqr);
        dy = mulscale14(wall[wal->point2].y-wal->y,dasqr);

        i = nsqrtasm(daslope*daslope+16777216);

        x = globalx; y = globaly;
        globalx = dmulscale16(x,dx,y,dy);
        globaly = mulscale12(dmulscale16(-y,dx,x,dy),i);

        x = ((wal->x-globalposx)<<8); y = ((wal->y-globalposy)<<8);
        globalx1 = dmulscale16(-x,dx,-y,dy);
        globaly1 = mulscale12(dmulscale16(-y,dx,x,dy),i);

        x = globalx2; y = globaly2;
        globalx2 = dmulscale16(x,dx,y,dy);
        globaly2 = mulscale12(dmulscale16(-y,dx,x,dy),i);
    }
    if (globalorientation&0x4)
    {
        i = globalx; globalx = -globaly; globaly = -i;
        i = globalx1; globalx1 = globaly1; globaly1 = i;
        i = globalx2; globalx2 = -globaly2; globaly2 = -i;
    }
    if (globalorientation&0x10) { globalx1 = -globalx1, globalx2 = -globalx2, globalx = -globalx; }
    if (globalorientation&0x20) { globaly1 = -globaly1, globaly2 = -globaly2, globaly = -globaly; }

    daz = dmulscale9(wx,globalposy-wal->y,-wy,globalposx-wal->x) + ((daz-globalposz)<<8);
    globalx2 = mulscale20(globalx2,daz); globalx = mulscale28(globalx,daz);
    globaly2 = mulscale20(globaly2,-daz); globaly = mulscale28(globaly,-daz);

    i = 8-(picsiz[globalpicnum]&15); j = 8-(picsiz[globalpicnum]>>4);
    if (globalorientation&8) { i++; j++; }
    globalx1 <<= (i+12); globalx2 <<= i; globalx <<= i;
    globaly1 <<= (j+12); globaly2 <<= j; globaly <<= j;

    if (dastat == 0)
    {
        globalx1 += (uint32_t)sec->ceilingxpanning<<24;
        globaly1 += (uint32_t)sec->ceilingypanning<<24;
    }
    else
    {
        globalx1 += (uint32_t)sec->floorxpanning<<24;
        globaly1 += (uint32_t)sec->floorypanning<<24;
    }

    asm1 = -(globalzd>>(16-BITSOFPRECISION));

    globvis = globalvisibility;
    if (sec->visibility != 0) globvis = mulscale4(globvis, (uint8_t)(sec->visibility+16));
    globvis = mulscale13(globvis,daz);
    globvis = mulscale16(globvis,xdimscale);
    j = FP_OFF(palookup[globalpal]);

    setupslopevlin_alsotrans((picsiz[globalpicnum]&15) + ((picsiz[globalpicnum]>>4)<<8),
                             waloff[globalpicnum],-ylookup[1]);

    l = (globalzd>>16);

    shinc = mulscale16(globalz,xdimenscale);
    if (shinc > 0) shoffs = (4<<15); else shoffs = ((16380-ydimen)<<15);    // JBF: was 2044
    if (dastat == 0) y1 = umost[dax1]; else y1 = max(umost[dax1],dplc[dax1]);
    m1 = mulscale16(y1,globalzd) + (globalzx>>6);
    //Avoid visibility overflow by crossing horizon
    if (globalzd > 0) m1 += (globalzd>>16); else m1 -= (globalzd>>16);
    m2 = m1+l;
    mptr1 = (intptr_t *)&slopalookup[y1+(shoffs>>15)]; mptr2 = mptr1+1;

    for (x=dax1; x<=dax2; x++)
    {
        if (dastat == 0) { y1 = umost[x]; y2 = min(dmost[x],uplc[x])-1; }
        else { y1 = max(umost[x],dplc[x]); y2 = dmost[x]-1; }
        if (y1 <= y2)
        {
            nptr1 = &slopalookup[y1+(shoffs>>15)];
            nptr2 = &slopalookup[y2+(shoffs>>15)];
            while (nptr1 <= mptr1)
            {
                *mptr1-- = j + getpalookupsh(mulscale24(krecipasm(m1),globvis));
                m1 -= l;
            }
            while (nptr2 >= mptr2)
            {
                *mptr2++ = j + getpalookupsh(mulscale24(krecipasm(m2),globvis));
                m2 += l;
            }

            globalx3 = (globalx2>>10);
            globaly3 = (globaly2>>10);
            asm3 = mulscale16(y2,globalzd) + (globalzx>>6);
            if ((globalorientation&256)==0)
                slopevlin(ylookup[y2]+x+frameoffset,krecipasm(asm3>>3),(intptr_t)nptr2,y2-y1+1,globalx1,globaly1);
            else
                tslopevlin((uint8_t *)(ylookup[y2]+x+frameoffset),0,nptr2,y2-y1+1,globalx1,globaly1);

            if ((x&15) == 0) faketimerhandler();
        }
        globalx2 += globalx;
        globaly2 += globaly;
        globalzx += globalz;
        shoffs += shinc;
    }
}


//
// parascan (internal)
//
static void parascan(int32_t dax1, int32_t dax2, int32_t sectnum, char dastat, int32_t bunch)
{
    sectortype *sec;
    int32_t j, k, l, m, n, x, z, wallnum, nextsectnum, globalhorizbak;
    int16_t *topptr, *botptr;

    int32_t dapyscale, dapskybits;
    const int8_t *dapskyoff;

    int32_t logtilesizy, tsizy;

    UNREFERENCED_PARAMETER(dax1);
    UNREFERENCED_PARAMETER(dax2);

    sectnum = thesector[bunchfirst[bunch]]; sec = &sector[sectnum];

    globalhorizbak = globalhoriz;
    globvis = globalpisibility;
    //globalorientation = 0L;
    if (sec->visibility != 0)
        globvis = mulscale4(globvis, (uint8_t)(sec->visibility+16));

    if (dastat == 0)
    {
        globalpal = sec->ceilingpal;
        globalpicnum = sec->ceilingpicnum;
        globalshade = (int32_t)sec->ceilingshade;
        globalxpanning = (int32_t)sec->ceilingxpanning;
        globalypanning = (int32_t)sec->ceilingypanning;
        topptr = umost;
        botptr = uplc;
    }
    else
    {
        globalpal = sec->floorpal;
        globalpicnum = sec->floorpicnum;
        globalshade = (int32_t)sec->floorshade;
        globalxpanning = (int32_t)sec->floorxpanning;
        globalypanning = (int32_t)sec->floorypanning;
        topptr = dplc;
        botptr = dmost;
    }

    if ((unsigned)globalpicnum >= MAXTILES) globalpicnum = 0;
    DO_TILE_ANIM(globalpicnum, sectnum);

    logtilesizy = (picsiz[globalpicnum]>>4);
    tsizy = tilesizy[globalpicnum];

    if (tsizy==0)
        return;

    dapskyoff = getpsky(globalpicnum, &dapyscale, &dapskybits);

    globalshiftval = logtilesizy;

    // before proper non-power-of-two tilesizy drawing
    if (oldnonpow2() && pow2long[logtilesizy] != tsizy)
        globalshiftval++;
#ifdef CLASSIC_NONPOW2_YSIZE_WALLS
    // non power-of-two y size textures!
    if ((!oldnonpow2() && pow2long[logtilesizy] != tsizy) || tsizy >= 512)
    {
        globaltilesizy = tsizy;
        globalyscale = 65536 / tsizy;
        globalshiftval = 0;
        globalzd = divscale32(((tsizy>>1)/*+g_psky.yoffs*/), tsizy) + ((uint32_t)globalypanning<<24);
    }
    else
#endif
    {
        globalshiftval = 32-globalshiftval;
        globalyscale = (8<<(globalshiftval-19));
        globalzd = (((tsizy>>1)/*+g_psky.yoffs*/)<<globalshiftval) + ((uint32_t)globalypanning<<24);
    }

    //if (globalorientation&256) globalyscale = -globalyscale, globalzd = -globalzd;

    if (dapyscale != 65536)
        globalhoriz = mulscale16(globalhoriz-(ydimen>>1),dapyscale) + (ydimen>>1);

    k = 11 - (picsiz[globalpicnum]&15) - dapskybits;

    // WGR2 SVN: select new episode after playing wgmicky1 with Polymer
    //  (maybe switched to classic earlier).
    //  --> rendmode==0, glrendermode == REND_POLYMER, we end up with globalpicnum==266,
    //      picsiz...==9 and dapskybits==3
    // FIXME ?
    if (k < 0)
        k = 0;

    x = -1;

    for (z=bunchfirst[bunch]; z>=0; z=p2[z])
    {
        wallnum = thewall[z]; nextsectnum = wall[wallnum].nextsector;

        if (nextsectnum >= 0)  //else negative array access
        {
            if (dastat == 0) j = sector[nextsectnum].ceilingstat;
            else j = sector[nextsectnum].floorstat;
        }

        if ((nextsectnum < 0) || (wall[wallnum].cstat&32) || ((j&1) == 0))
        {
            if (x == -1) x = xb1[z];

            if (parallaxtype == 0 || no_radarang2)
            {
                n = mulscale16(xdimenrecip,viewingrange);
                for (j=xb1[z]; j<=xb2[z]; j++)
                    lplc[j] = ((mulscale23(j-halfxdimen,n)+globalang)&2047)>>k;
            }
            else
            {
                for (j=xb1[z]; j<=xb2[z]; j++)
                    lplc[j] = ((radarang2[j]+globalang)&2047)>>k;
            }

            if (parallaxtype == 2 && !no_radarang2)
            {
                n = mulscale16(xdimscale,viewingrange);
                for (j=xb1[z]; j<=xb2[z]; j++)
                    swplc[j] = mulscale14(sintable[(radarang2[j]+512)&2047],n);
            }
            else
                clearbuf(&swplc[xb1[z]],xb2[z]-xb1[z]+1,mulscale16(xdimscale,viewingrange));
        }
        else if (x >= 0)
        {
            l = globalpicnum; m = (picsiz[globalpicnum]&15);
            globalpicnum = l + dapskyoff[lplc[x]>>m];

            if (((lplc[x]^lplc[xb1[z]-1])>>m) == 0)
                wallscan(x,xb1[z]-1,topptr,botptr,swplc,lplc);
            else
            {
                j = x;
                while (x < xb1[z])
                {
                    n = l + dapskyoff[lplc[x]>>m];
                    if (n != globalpicnum)
                    {
                        wallscan(j,x-1,topptr,botptr,swplc,lplc);
                        j = x;
                        globalpicnum = n;
                    }
                    x++;
                }
                if (j < x)
                    wallscan(j,x-1,topptr,botptr,swplc,lplc);
            }

            globalpicnum = l;
            x = -1;
        }
    }

    if (x >= 0)
    {
        l = globalpicnum; m = (picsiz[globalpicnum]&15);
        globalpicnum = l + dapskyoff[lplc[x]>>m];

        if (((lplc[x]^lplc[xb2[bunchlast[bunch]]])>>m) == 0)
            wallscan(x,xb2[bunchlast[bunch]],topptr,botptr,swplc,lplc);
        else
        {
            j = x;
            while (x <= xb2[bunchlast[bunch]])
            {
                n = l + dapskyoff[lplc[x]>>m];
                if (n != globalpicnum)
                {
                    wallscan(j,x-1,topptr,botptr,swplc,lplc);
                    j = x;
                    globalpicnum = n;
                }
                x++;
            }
            if (j <= x)
                wallscan(j,x-1,topptr,botptr,swplc,lplc);
        }
        globalpicnum = l;
    }
    globalhoriz = globalhorizbak;
}


// set orientation, panning, shade, pal; picnum
static void setup_globals_wall1(const walltype *wal, int32_t dapicnum)
{
    globalorientation = wal->cstat;

    globalpicnum = dapicnum;
    if ((unsigned)globalpicnum >= MAXTILES) globalpicnum = 0;
    DO_TILE_ANIM(globalpicnum, 0);

    globalxpanning = wal->xpanning;
    globalypanning = wal->ypanning;

    globalshade = wal->shade;
    globalpal = wal->pal;
    if (palookup[globalpal] == NULL) globalpal = 0;    // JBF: fixes crash
}

static void setup_globals_wall2(const walltype *wal, uint8_t secvisibility, int32_t topzref, int32_t botzref)
{
    const int32_t logtilesizy = (picsiz[globalpicnum]>>4);
    const int32_t tsizy = tilesizy[globalpicnum];

    if (tsizy==0)
    {
        globalshiftval = -1;
        return;
    }

    globvis = globalvisibility;
    if (secvisibility != 0)
        globvis = mulscale4(globvis, (uint8_t)(secvisibility+16));

    globalshiftval = logtilesizy;

    // before proper non-power-of-two tilesizy drawing
    if (oldnonpow2() && pow2long[logtilesizy] != tsizy)
        globalshiftval++;
#ifdef CLASSIC_NONPOW2_YSIZE_WALLS
    // non power-of-two y size textures!
    if ((!oldnonpow2() && pow2long[logtilesizy] != tsizy) || tsizy >= 512)
    {
        globaltilesizy = tsizy;
        globalyscale = divscale13(wal->yrepeat, tsizy);
        globalshiftval = 0;
    }
    else
#endif
    {
        // globalshiftval==13 --> globalshiftval==19
        //  ==> upper texture y size limit *here* = 8192
        globalshiftval = 32-globalshiftval;
        globalyscale = wal->yrepeat<<(globalshiftval-19);
    }

    if ((globalorientation&4) == 0)
        globalzd = (((int64_t)(globalposz-topzref)*globalyscale)<<8);
    else  // bottom-aligned
        globalzd = (((int64_t)(globalposz-botzref)*globalyscale)<<8);
    globalzd = (uint32_t)globalzd + (globalypanning<<24);

    if (globalorientation&256)  // y-flipped
        globalyscale = -globalyscale, globalzd = -(int64_t)globalzd;
}


/* _______________
 * X umost #######
 * ###### ________
 * ______/
 * X dwall
 *
 * ________
 * X uwall \______
 * ///////////////
 * _______________
 * X dmost
 */

#ifdef YAX_ENABLE
// returns: should dmost be raised when drawing a "ceiling wall"?
static int32_t should_clip_cwall(int32_t x1, int32_t x2)
{
    int32_t x;

    if (yax_globallev <= YAX_MAXDRAWS)
        return 1;

    for (x=x1; x<=x2; x++)
        if (dwall[x] < dmost[x] || uplc[x] < dmost[x])
            return 1;

    return 0;
}

// returns: should umost be lowered when drawing a "floor wall"?
static int32_t should_clip_fwall(int32_t x1, int32_t x2)
{
    int32_t x;

    if (yax_globallev >= YAX_MAXDRAWS)
        return 1;

    for (x=x1; x<=x2; x++)
        if (uwall[x] > umost[x] || dplc[x] > umost[x])
            return 1;

    return 0;
}
#endif

//
// drawalls (internal)
//
static void drawalls(int32_t bunch)
{
    sectortype *sec, *nextsec;
    walltype *wal;
    int32_t i, x, x1, x2, cz[5], fz[5];
    int32_t z, wallnum, sectnum, nextsectnum;
    int32_t startsmostwallcnt, startsmostcnt, gotswall;
    char andwstat1, andwstat2;

    z = bunchfirst[bunch];
    sectnum = thesector[z]; sec = &sector[sectnum];

    andwstat1 = 0xff; andwstat2 = 0xff;
    for (; z>=0; z=p2[z]) //uplc/dplc calculation
    {
        andwstat1 &= wallmost(uplc,z,sectnum,(uint8_t)0);
        andwstat2 &= wallmost(dplc,z,sectnum,(uint8_t)1);
    }

#ifdef YAX_ENABLE
    if (g_nodraw)
    {
        int32_t baselevp, checkcf;
        int16_t bn[2];
# if 0
        int32_t obunchchk = (1 && yax_globalbunch>=0 &&
                             haveymost[yax_globalbunch>>3]&(1<<(yax_globalbunch&7)));

        // if (obunchchk)
        x2 = yax_globalbunch*xdimen;
# endif
        baselevp = (yax_globallev == YAX_MAXDRAWS);

        yax_getbunches(sectnum, &bn[0], &bn[1]);
        checkcf = (bn[0]>=0) + ((bn[1]>=0)<<1);
        if (!baselevp)
            checkcf &= (1<<yax_globalcf);

        if ((andwstat1&3) == 3)  // ceilings clipped
            checkcf &= ~1;
        if ((andwstat2&12) == 12)  // floors clipped
            checkcf &= ~2;

        for (i=0; i<2; i++)
            if (checkcf&(1<<i))
            {
                if ((haveymost[bn[i]>>3]&(1<<(bn[i]&7)))==0)
                {
                    // init yax *most arrays for that bunch
                    haveymost[bn[i]>>3] |= (1<<(bn[i]&7));
                    for (x=xdimen*bn[i]; x<xdimen*(bn[i]+1); x++)
                    {
                        yumost[x] = ydimen;
                        ydmost[x] = 0;
                    }
                }

                x1 = bn[i]*xdimen;
                for (x=x1+xb1[bunchfirst[bunch]]; x<=x1+xb2[bunchlast[bunch]]; x++)
                {
                    if (i==YAX_CEILING)
                    {
                        yumost[x] = min(yumost[x], umost[x-x1]);
                        ydmost[x] = max(ydmost[x], min(dmost[x-x1], uplc[x-x1]));
                    }
                    else
                    {
                        yumost[x] = min(yumost[x], max(umost[x-x1], dplc[x-x1]));
                        ydmost[x] = max(ydmost[x], dmost[x-x1]);
                    }
# if 0
                    if (obunchchk)
                    {
                        yumost[x] = max(yumost[x], yumost[x-x1+x2]);
                        ydmost[x] = min(ydmost[x], ydmost[x-x1+x2]);
                    }
# endif
                }
            }
    }
    else
#endif
    {
        if ((andwstat1&3) != 3)     //draw ceilings
#ifdef YAX_ENABLE
            // this is to prevent double-drawing of translucent masked ceilings
            if (r_tror_nomaskpass==0 || yax_globallev==YAX_MAXDRAWS || (sec->ceilingstat&256)==0 ||
                yax_nomaskpass==1 || !(yax_gotsector[sectnum>>3]&(1<<(sectnum&7))))
#endif
        {
            if ((sec->ceilingstat&3) == 2)
                grouscan(xb1[bunchfirst[bunch]],xb2[bunchlast[bunch]],sectnum,0);
            else if ((sec->ceilingstat&1) == 0)
                ceilscan(xb1[bunchfirst[bunch]],xb2[bunchlast[bunch]],sectnum);
            else
                parascan(xb1[bunchfirst[bunch]],xb2[bunchlast[bunch]],sectnum,0,bunch);
        }

        if ((andwstat2&12) != 12)   //draw floors
#ifdef YAX_ENABLE
            // this is to prevent double-drawing of translucent masked floors
            if (r_tror_nomaskpass==0 || yax_globallev==YAX_MAXDRAWS || (sec->floorstat&256)==0 ||
                yax_nomaskpass==1 || !(yax_gotsector[sectnum>>3]&(1<<(sectnum&7))))
#endif
        {
            if ((sec->floorstat&3) == 2)
                grouscan(xb1[bunchfirst[bunch]],xb2[bunchlast[bunch]],sectnum,1);
            else if ((sec->floorstat&1) == 0)
                florscan(xb1[bunchfirst[bunch]],xb2[bunchlast[bunch]],sectnum);
            else
                parascan(xb1[bunchfirst[bunch]],xb2[bunchlast[bunch]],sectnum,1,bunch);
        }
    }


    //DRAW WALLS SECTION!
    for (z=bunchfirst[bunch]; z>=0; z=p2[z])
    {
        x1 = xb1[z]; x2 = xb2[z];
        if (umost[x2] >= dmost[x2])
        {
            for (x=x1; x<x2; x++)
                if (umost[x] < dmost[x]) break;
            if (x >= x2)
            {
                smostwall[smostwallcnt] = z;
                smostwalltype[smostwallcnt] = 0;
                smostwallcnt++;
                continue;
            }
        }

        wallnum = thewall[z]; wal = &wall[wallnum];
        nextsectnum = wal->nextsector;
        nextsec = nextsectnum>=0 ? &sector[nextsectnum] : NULL;

        gotswall = 0;

        startsmostwallcnt = smostwallcnt;
        startsmostcnt = smostcnt;

        if ((searchit == 2) && (searchx >= x1) && (searchx <= x2))
        {
            if (searchy <= uplc[searchx]
#ifdef YAX_ENABLE
                && umost[searchx] <= searchy && getceilzofslope(sectnum, globalposx, globalposy) <= globalposz
                && (yax_getbunch(sectnum, YAX_CEILING) < 0 || showinvisibility || (sec->ceilingstat&(256+128)) || klabs(yax_globallev-YAX_MAXDRAWS)==YAX_MAXDRAWS)
#endif
                ) //ceiling
            {
                searchsector = sectnum; searchwall = wallnum;
                searchstat = 1; searchit = 1;
            }
            else if (dplc[searchx] <= searchy
#ifdef YAX_ENABLE
                     && searchy < dmost[searchx] && getflorzofslope(sectnum, globalposx, globalposy) >= globalposz
                     && (yax_getbunch(sectnum, YAX_FLOOR) < 0 || showinvisibility || (sec->floorstat&(256+128)) || klabs(yax_globallev-YAX_MAXDRAWS)==YAX_MAXDRAWS)
#endif
                ) //floor
            {
                searchsector = sectnum; searchwall = wallnum;
                searchstat = 2; searchit = 1;
            }
        }

#ifdef YAX_ENABLE
        if (yax_nomaskpass==0 || !yax_isislandwall(wallnum, !yax_globalcf) || (yax_nomaskdidit=1, 0))
#endif
        if (nextsectnum >= 0)
        {
            // 2       <---       3
            // x------------------x
            // 0       --->       1
            //
            //     4 (our pos, z wrt the nextsector!)

            getzsofslope((int16_t)sectnum,wal->x,wal->y,&cz[0],&fz[0]);
            getzsofslope((int16_t)sectnum,wall[wal->point2].x,wall[wal->point2].y,&cz[1],&fz[1]);
            getzsofslope((int16_t)nextsectnum,wal->x,wal->y,&cz[2],&fz[2]);
            getzsofslope((int16_t)nextsectnum,wall[wal->point2].x,wall[wal->point2].y,&cz[3],&fz[3]);
            getzsofslope((int16_t)nextsectnum,globalposx,globalposy,&cz[4],&fz[4]);

            if ((wal->cstat&48) == 16) maskwall[maskwallcnt++] = z;

            if (((sec->ceilingstat&1) == 0) || ((nextsec->ceilingstat&1) == 0))
            {
                if ((cz[2] <= cz[0]) && (cz[3] <= cz[1]))
                {
//                    if (globparaceilclip)
                    if (getceilzofslope(sectnum, globalposx, globalposy) <= globalposz)
                        for (x=x1; x<=x2; x++)
                            if (uplc[x] > umost[x])
                                if (umost[x] <= dmost[x])
                                {
                                    umost[x] = uplc[x];
                                    if (umost[x] > dmost[x]) numhits--;
                                }
                }
                else
                {
                    wallmost(dwall,z,nextsectnum,(uint8_t)0);

                    if ((cz[2] > fz[0]) || (cz[3] > fz[1]))
                        for (i=x1; i<=x2; i++) if (dwall[i] > dplc[i]) dwall[i] = dplc[i];

                    if ((searchit == 2) && (searchx >= x1) && (searchx <= x2))
#ifdef YAX_ENABLE
                        if (uplc[searchx] <= searchy)
#endif
                        if (searchy <= dwall[searchx]) //wall
                        {
                            searchsector = sectnum; searchbottomwall = searchwall = wallnum;
                            searchisbottom = 0;
                            searchstat = 0; searchit = 1;
                        }

                    setup_globals_wall1(wal, wal->picnum);
                    setup_globals_wall2(wal, sec->visibility, nextsec->ceilingz, sec->ceilingz);

                    if (gotswall == 0) { gotswall = 1; prepwall(z,wal); }
                    wallscan(x1,x2,uplc,dwall,swall,lwall);

                    if ((cz[2] >= cz[0]) && (cz[3] >= cz[1]))
                    {
#ifdef YAX_ENABLE
                        if (should_clip_cwall(x1, x2))
#endif
                        for (x=x1; x<=x2; x++)
                            if (dwall[x] > umost[x])
                                if (umost[x] <= dmost[x])
                                {
                                    umost[x] = dwall[x];
                                    if (umost[x] > dmost[x]) numhits--;
                                }
                    }
                    else
                    {
#ifdef YAX_ENABLE
                        if (should_clip_cwall(x1, x2))
#endif
                        for (x=x1; x<=x2; x++)
                            if (umost[x] <= dmost[x])
                            {
                                i = max(uplc[x],dwall[x]);
                                if (i > umost[x])
                                {
                                    umost[x] = i;
                                    if (umost[x] > dmost[x]) numhits--;
                                }
                            }
                    }
                }

                if ((cz[2] < cz[0]) || (cz[3] < cz[1]) || (globalposz < cz[4]))
                {
                    i = x2-x1+1;
                    if (smostcnt+i < MAXYSAVES)
                    {
                        smoststart[smostwallcnt] = smostcnt;
                        smostwall[smostwallcnt] = z;
                        smostwalltype[smostwallcnt] = 1;   //1 for umost
                        smostwallcnt++;
                        copybufbyte(&umost[x1],&smost[smostcnt],i*sizeof(smost[0]));
                        smostcnt += i;
                    }
                }
            }

            if (((sec->floorstat&1) == 0) || ((nextsec->floorstat&1) == 0))
            {
                if ((fz[2] >= fz[0]) && (fz[3] >= fz[1]))
                {
//                    if (globparaflorclip)
                    if (getflorzofslope(sectnum, globalposx, globalposy) >= globalposz)
                        for (x=x1; x<=x2; x++)
                            if (dplc[x] < dmost[x])
                                if (umost[x] <= dmost[x])
                                {
                                    dmost[x] = dplc[x];
                                    if (umost[x] > dmost[x]) numhits--;
                                }
                }
                else
                {
                    wallmost(uwall,z,nextsectnum,(uint8_t)1);

                    if ((fz[2] < cz[0]) || (fz[3] < cz[1]))
                        for (i=x1; i<=x2; i++) if (uwall[i] < uplc[i]) uwall[i] = uplc[i];

                    if ((searchit == 2) && (searchx >= x1) && (searchx <= x2))
#ifdef YAX_ENABLE
                        if (dplc[searchx] >= searchy)
#endif
                        if (searchy >= uwall[searchx]) //wall
                        {
                            searchsector = sectnum; searchbottomwall = searchwall = wallnum;
                            if ((wal->cstat&2) > 0) searchbottomwall = wal->nextwall;
                            searchisbottom = 1;
                            searchstat = 0; searchit = 1;
                        }

                    {
                        const walltype *twal = (wal->cstat&2) ? &wall[wal->nextwall] : wal;
                        setup_globals_wall1(twal, twal->picnum);
                    }

                    setup_globals_wall2(wal, sec->visibility, nextsec->floorz, sec->ceilingz);

                    if (gotswall == 0) { gotswall = 1; prepwall(z,wal); }
                    wallscan(x1,x2,uwall,dplc,swall,lwall);

                    if ((fz[2] <= fz[0]) && (fz[3] <= fz[1]))
                    {
#ifdef YAX_ENABLE
                        if (should_clip_fwall(x1, x2))
#endif
                        for (x=x1; x<=x2; x++)
                            if (uwall[x] < dmost[x])
                                if (umost[x] <= dmost[x])
                                {
                                    dmost[x] = uwall[x];
                                    if (umost[x] > dmost[x]) numhits--;
                                }
                    }
                    else
                    {
#ifdef YAX_ENABLE
                        if (should_clip_fwall(x1, x2))
#endif
                        for (x=x1; x<=x2; x++)
                            if (umost[x] <= dmost[x])
                            {
                                i = min(dplc[x],uwall[x]);
                                if (i < dmost[x])
                                {
                                    dmost[x] = i;
                                    if (umost[x] > dmost[x]) numhits--;
                                }
                            }
                    }
                }

                if ((fz[2] > fz[0]) || (fz[3] > fz[1]) || (globalposz > fz[4]))
                {
                    i = x2-x1+1;
                    if (smostcnt+i < MAXYSAVES)
                    {
                        smoststart[smostwallcnt] = smostcnt;
                        smostwall[smostwallcnt] = z;
                        smostwalltype[smostwallcnt] = 2;   //2 for dmost
                        smostwallcnt++;
                        copybufbyte(&dmost[x1],&smost[smostcnt],i*sizeof(smost[0]));
                        smostcnt += i;
                    }
                }
            }

            if (numhits < 0) return;
            if ((!(wal->cstat&32)) && ((gotsector[nextsectnum>>3]&pow2char[nextsectnum&7]) == 0))
            {
                if (umost[x2] < dmost[x2])
                    scansector(nextsectnum);
                else
                {
                    for (x=x1; x<x2; x++)
                        if (umost[x] < dmost[x])
                            { scansector(nextsectnum); break; }

                    //If can't see sector beyond, then cancel smost array and just
                    //store wall!
                    if (x == x2)
                    {
                        smostwallcnt = startsmostwallcnt;
                        smostcnt = startsmostcnt;
                        smostwall[smostwallcnt] = z;
                        smostwalltype[smostwallcnt] = 0;
                        smostwallcnt++;
                    }
                }
            }
        }

        if ((nextsectnum < 0) || (wal->cstat&32))   //White/1-way wall
        {
            setup_globals_wall1(wal, (nextsectnum < 0) ? wal->picnum : wal->overpicnum);
            setup_globals_wall2(wal, sec->visibility,
                                (nextsectnum >= 0) ? nextsec->ceilingz : sec->ceilingz,
                                (nextsectnum >= 0) ? sec->ceilingz : sec->floorz);

            if (gotswall == 0) { gotswall = 1; prepwall(z,wal); }
            wallscan(x1,x2,uplc,dplc,swall,lwall);

#ifdef YAX_ENABLE
            // TODO: slopes?

            if (globalposz > sec->floorz && yax_isislandwall(wallnum, YAX_FLOOR))
            {
                for (x=x1; x<=x2; x++)
                    if (dplc[x] > umost[x] && umost[x] <= dmost[x])
                    {
                        umost[x] = dplc[x];
                        if (umost[x] > dmost[x]) numhits--;
                    }
            }
            else if (globalposz < sec->ceilingz && yax_isislandwall(wallnum, YAX_CEILING))
            {
                for (x=x1; x<=x2; x++)
                    if (uplc[x] < dmost[x] && umost[x] <= dmost[x])
                    {
                        dmost[x] = uplc[x];
                        if (umost[x] > dmost[x]) numhits--;
                    }
            }
            else
#endif
            for (x=x1; x<=x2; x++)
                if (umost[x] <= dmost[x])
                    { umost[x] = 1; dmost[x] = 0; numhits--; }
            smostwall[smostwallcnt] = z;
            smostwalltype[smostwallcnt] = 0;
            smostwallcnt++;

            if ((searchit == 2) && (x1 <= searchx) && (searchx <= x2))
#ifdef YAX_ENABLE
                if (uplc[searchx] <= searchy && searchy < dplc[searchx])
#endif
            {
                searchit = 1; searchsector = sectnum; searchbottomwall = searchwall = wallnum;
                if (nextsectnum < 0) searchstat = 0; else searchstat = 4;
            }
        }

#ifdef ENGINE_SCREENSHOT_DEBUG
        if (engine_screenshot)
# ifdef YAX_ENABLE
        if (!g_nodraw)
# endif
        {
            static char fn[32], tmpbuf[80];
            static char bakframe[MAXXDIM*MAXYDIM];

            char purple = getclosestcol(63, 0, 63);
            char yellow = getclosestcol(63, 63, 0);

            begindrawing();  //{{{
            Bmemcpy(bakframe, (char *)frameplace, xdim*ydim);
            for (x=0; x<xdim; x++)
            {
                if (umost[x] > dmost[x])
                {
                    *((char *)frameplace + (ydim/2)*bytesperline + x) = yellow;
                    *((char *)frameplace + (ydim/2+1)*bytesperline + x) = purple;
                    continue;
                }

                if (umost[x] >= 0 && umost[x] < ydim)
                    *((char *)frameplace + umost[x]*bytesperline + x) = purple;

                if (dmost[x]-1 >= 0 && dmost[x]-1 < ydim)
                    *((char *)frameplace + (dmost[x]-1)*bytesperline + x) = yellow;
            }

            Bsprintf(tmpbuf, "nmp%d l%d b%d s%d w%d", yax_nomaskpass, yax_globallev-YAX_MAXDRAWS,
                     yax_globalbunch, sectnum, wallnum);
            printext256(8,8, whitecol,0, tmpbuf, 0);

            Bsprintf(fn, "engshot%04d.png", engine_screenshot);
            screencapture(fn, 0, "BUILD engine");
            engine_screenshot++;

            Bmemcpy((char *)frameplace, bakframe, xdim*ydim);
            enddrawing();  //}}}
        }
#endif
    }
}


//
// drawvox
//
static void drawvox(int32_t dasprx, int32_t daspry, int32_t dasprz, int32_t dasprang,
                    int32_t daxscale, int32_t dayscale, char daindex,
                    int8_t dashade, char dapal, const int32_t *daumost, const int32_t *dadmost)
{
    int32_t i, j, k, x, y, syoff, ggxstart, ggystart, nxoff;
    int32_t cosang, sinang, sprcosang, sprsinang, backx, backy, gxinc, gyinc;
    int32_t daxsiz, daysiz, /*dazsiz,*/ daxpivot, daypivot, dazpivot;
    int32_t daxscalerecip, dayscalerecip, cnt, gxstart, gystart, odayscale;
    int32_t l1, l2, /*slabxoffs,*/ xyvoxoffs, *longptr;
    intptr_t slabxoffs;
    int32_t lx, rx, nx, ny, x1=0, y1=0, z1, x2=0, y2=0, z2, yplc, yinc=0;
    int32_t yoff, xs=0, ys=0, xe, ye, xi=0, yi=0, cbackx, cbacky, dagxinc, dagyinc;
    int16_t *shortptr;
    char *voxptr, *voxend, *davoxptr, oand, oand16, oand32;

    cosang = sintable[(globalang+512)&2047];
    sinang = sintable[globalang&2047];
    sprcosang = sintable[(dasprang+512)&2047];
    sprsinang = sintable[dasprang&2047];

    i = klabs(dmulscale6(dasprx-globalposx,cosang,daspry-globalposy,sinang));
    j = getpalookup(mulscale21(globvis,i), dashade)<<8;
    setupdrawslab(ylookup[1],FP_OFF(palookup[dapal])+j);
    j = 1310720;
    j *= min(daxscale,dayscale); j >>= 6;  //New hacks (for sized-down voxels)
    for (k=0; k<MAXVOXMIPS; k++)
    {
        if (i < j) { i = k; break; }
        j <<= 1;
    }
    if (k >= MAXVOXMIPS) i = MAXVOXMIPS-1;

    if (novoxmips) i = 0;
    davoxptr = (char *)voxoff[daindex][i];
    if (!davoxptr && i > 0) { davoxptr = (char *)voxoff[daindex][0]; i = 0; }
    if (!davoxptr) return;

    if (voxscale[daindex] == 65536)
        { daxscale <<= (i+8); dayscale <<= (i+8); }
    else
    {
        daxscale = mulscale8(daxscale<<i,voxscale[daindex]);
        dayscale = mulscale8(dayscale<<i,voxscale[daindex]);
    }

    odayscale = dayscale;
    daxscale = mulscale16(daxscale,xyaspect);
    daxscale = scale(daxscale,xdimenscale,xdimen<<8);
    dayscale = scale(dayscale,mulscale16(xdimenscale,viewingrangerecip),xdimen<<8);

    daxscalerecip = (1<<30)/daxscale;
    dayscalerecip = (1<<30)/dayscale;

    longptr = (int32_t *)davoxptr;
    daxsiz = B_LITTLE32(longptr[0]); daysiz = B_LITTLE32(longptr[1]); //dazsiz = B_LITTLE32(longptr[2]);
    daxpivot = B_LITTLE32(longptr[3]); daypivot = B_LITTLE32(longptr[4]); dazpivot = B_LITTLE32(longptr[5]);
    davoxptr += (6<<2);

    x = mulscale16(globalposx-dasprx,daxscalerecip);
    y = mulscale16(globalposy-daspry,daxscalerecip);
    backx = ((dmulscale10(x,sprcosang,y,sprsinang)+daxpivot)>>8);
    backy = ((dmulscale10(y,sprcosang,x,-sprsinang)+daypivot)>>8);
    cbackx = min(max(backx,0),daxsiz-1);
    cbacky = min(max(backy,0),daysiz-1);

    sprcosang = mulscale14(daxscale,sprcosang);
    sprsinang = mulscale14(daxscale,sprsinang);

    x = (dasprx-globalposx) - dmulscale18(daxpivot,sprcosang,daypivot,-sprsinang);
    y = (daspry-globalposy) - dmulscale18(daypivot,sprcosang,daxpivot,sprsinang);

    cosang = mulscale16(cosang,dayscalerecip);
    sinang = mulscale16(sinang,dayscalerecip);

    gxstart = y*cosang - x*sinang;
    gystart = x*cosang + y*sinang;
    gxinc = dmulscale10(sprsinang,cosang,sprcosang,-sinang);
    gyinc = dmulscale10(sprcosang,cosang,sprsinang,sinang);

    x = 0; y = 0; j = max(daxsiz,daysiz);
    for (i=0; i<=j; i++)
    {
        ggxinc[i] = x; x += gxinc;
        ggyinc[i] = y; y += gyinc;
    }

    if ((klabs(globalposz-dasprz)>>10) >= klabs(odayscale)) return;
    syoff = divscale21(globalposz-dasprz,odayscale) + (dazpivot<<7);
    yoff = ((klabs(gxinc)+klabs(gyinc))>>1);
    longptr = (int32_t *)davoxptr;
    xyvoxoffs = ((daxsiz+1)<<2);

    begindrawing(); //{{{

    for (cnt=0; cnt<8; cnt++)
    {
        switch (cnt)
        {
        case 0:
            xs = 0;        ys = 0;        xi = 1;  yi = 1;  break;
        case 1:
            xs = daxsiz-1; ys = 0;        xi = -1; yi = 1;  break;
        case 2:
            xs = 0;        ys = daysiz-1; xi = 1;  yi = -1; break;
        case 3:
            xs = daxsiz-1; ys = daysiz-1; xi = -1; yi = -1; break;
        case 4:
            xs = 0;        ys = cbacky;   xi = 1;  yi = 2;  break;
        case 5:
            xs = daxsiz-1; ys = cbacky;   xi = -1; yi = 2;  break;
        case 6:
            xs = cbackx;   ys = 0;        xi = 2;  yi = 1;  break;
        case 7:
            xs = cbackx;   ys = daysiz-1; xi = 2;  yi = -1; break;
        }
        xe = cbackx; ye = cbacky;
        if (cnt < 4)
        {
            if ((xi < 0) && (xe >= xs)) continue;
            if ((xi > 0) && (xe <= xs)) continue;
            if ((yi < 0) && (ye >= ys)) continue;
            if ((yi > 0) && (ye <= ys)) continue;
        }
        else
        {
            if ((xi < 0) && (xe > xs)) continue;
            if ((xi > 0) && (xe < xs)) continue;
            if ((yi < 0) && (ye > ys)) continue;
            if ((yi > 0) && (ye < ys)) continue;
            xe += xi; ye += yi;
        }

        i = ksgn(ys-backy)+ksgn(xs-backx)*3+4;
        switch (i)
        {
        case 6:
        case 7:
            x1 = 0; y1 = 0; break;
        case 8:
        case 5:
            x1 = gxinc; y1 = gyinc; break;
        case 0:
        case 3:
            x1 = gyinc; y1 = -gxinc; break;
        case 2:
        case 1:
            x1 = gxinc+gyinc; y1 = gyinc-gxinc; break;
        }
        switch (i)
        {
        case 2:
        case 5:
            x2 = 0; y2 = 0; break;
        case 0:
        case 1:
            x2 = gxinc; y2 = gyinc; break;
        case 8:
        case 7:
            x2 = gyinc; y2 = -gxinc; break;
        case 6:
        case 3:
            x2 = gxinc+gyinc; y2 = gyinc-gxinc; break;
        }
        oand = pow2char[(xs<backx)+0]+pow2char[(ys<backy)+2];
        oand16 = oand+16;
        oand32 = oand+32;

        if (yi > 0) { dagxinc = gxinc; dagyinc = mulscale16(gyinc,viewingrangerecip); }
        else { dagxinc = -gxinc; dagyinc = -mulscale16(gyinc,viewingrangerecip); }

        //Fix for non 90 degree viewing ranges
        nxoff = mulscale16(x2-x1,viewingrangerecip);
        x1 = mulscale16(x1,viewingrangerecip);

        ggxstart = gxstart+ggyinc[ys];
        ggystart = gystart-ggxinc[ys];

        for (x=xs; x!=xe; x+=xi)
        {
            slabxoffs = (intptr_t)&davoxptr[B_LITTLE32(longptr[x])];
            shortptr = (int16_t *)&davoxptr[((x*(daysiz+1))<<1)+xyvoxoffs];

            nx = mulscale16(ggxstart+ggxinc[x],viewingrangerecip)+x1;
            ny = ggystart+ggyinc[x];
            for (y=ys; y!=ye; y+=yi,nx+=dagyinc,ny-=dagxinc)
            {
                if ((ny <= nytooclose) || (ny >= nytoofar)) continue;
                voxptr = (char *)(B_LITTLE16(shortptr[y])+slabxoffs);
                voxend = (char *)(B_LITTLE16(shortptr[y+1])+slabxoffs);
                if (voxptr == voxend) continue;

                // AMCTC V1 MEGABASE: (ny+y1)>>14 == 65547
                // (after long corridor with the blinds)
                lx = mulscale32(nx>>3,distrecip[(ny+y1)>>14])+halfxdimen;
                if (lx < 0) lx = 0;
                rx = mulscale32((nx+nxoff)>>3,distrecip[(ny+y2)>>14])+halfxdimen;
                if (rx > xdimen) rx = xdimen;
                if (rx <= lx) continue;
                rx -= lx;

                l1 = distrecip[(ny-yoff)>>14];
                // FIXME! AMCTC RC2/beta shotgun voxel
                // (e.g. training map right after M16 shooting):
                l2 = clamp((ny+yoff)>>14, 0, 65535);
                l2 = distrecip[l2];
                for (; voxptr<voxend; voxptr+=voxptr[1]+3)
                {
                    j = (voxptr[0]<<15)-syoff;
                    if (j < 0)
                    {
                        k = j+(voxptr[1]<<15);
                        if (k < 0)
                        {
                            if ((voxptr[2]&oand32) == 0) continue;
                            z2 = mulscale32(l2,k) + globalhoriz;     //Below slab
                        }
                        else
                        {
                            if ((voxptr[2]&oand) == 0) continue;    //Middle of slab
                            z2 = mulscale32(l1,k) + globalhoriz;
                        }
                        z1 = mulscale32(l1,j) + globalhoriz;
                    }
                    else
                    {
                        if ((voxptr[2]&oand16) == 0) continue;
                        z1 = mulscale32(l2,j) + globalhoriz;        //Above slab
                        z2 = mulscale32(l1,j+(voxptr[1]<<15)) + globalhoriz;
                    }

                    if (voxptr[1] == 1)
                    {
                        yplc = 0; yinc = 0;
                        if (z1 < daumost[lx]) z1 = daumost[lx];
                    }
                    else
                    {
                        if (z2-z1 >= 1024) yinc = divscale16(voxptr[1],z2-z1);
                        else if (z2 > z1) yinc = (lowrecip[z2-z1]*voxptr[1]>>8);
                        if (z1 < daumost[lx]) { yplc = yinc*(daumost[lx]-z1); z1 = daumost[lx]; }
                        else yplc = 0;
                    }
                    if (z2 > dadmost[lx]) z2 = dadmost[lx];
                    z2 -= z1; if (z2 <= 0) continue;

                    drawslab(rx,yplc,z2,yinc,(intptr_t)&voxptr[3],ylookup[z1]+lx+frameoffset);
                }
            }
        }
    }

#if 0
    for (x=0; x<xdimen; x++)
    {
        if (daumost[x]>=0 && daumost[x]<ydimen)
            *(char *)(frameplace + x + bytesperline*daumost[x]) = editorcolors[13];
        if (dadmost[x]>=0 && dadmost[x]<ydimen)
            *(char *)(frameplace + x + bytesperline*dadmost[x]) = editorcolors[14];
    }
#endif

    enddrawing();   //}}}
}


static void setup_globals_sprite1(const spritetype *tspr, const sectortype *sec,
                                     int32_t yspan, int32_t yoff, int32_t tilenum,
                                     int32_t cstat, int32_t *z1ptr, int32_t *z2ptr)
{
    int32_t logtilesizy, tsizy;
    int32_t z1, z2 = tspr->z - ((yoff*tspr->yrepeat)<<2);

    if (cstat&128)
    {
        z2 += ((yspan*tspr->yrepeat)<<1);
        if (yspan&1) z2 += (tspr->yrepeat<<1);        //Odd yspans
    }
    z1 = z2 - ((yspan*tspr->yrepeat)<<2);

    globalorientation = 0;
    globalpicnum = tilenum;
    if ((unsigned)globalpicnum >= MAXTILES) globalpicnum = 0;
    globalxpanning = 0;
    globalypanning = 0;

    globvis = globalvisibility;
    if (sec->visibility != 0) globvis = mulscale4(globvis, (uint8_t)(sec->visibility+16));

    logtilesizy = (picsiz[globalpicnum]>>4);
    tsizy = tilesizy[globalpicnum];

    globalshiftval = logtilesizy;
#if !defined CLASSIC_NONPOW2_YSIZE_SPRITES
    // before proper non-power-of-two tilesizy drawing
    if (pow2long[logtilesizy] != tsizy)
        globalshiftval++;
#else
    // non power-of-two y size textures!
    if (pow2long[logtilesizy] != tsizy || tsizy >= 512)
    {
        globaltilesizy = tsizy;
        globalyscale = (1<<22)/(tsizy*tspr->yrepeat);
        globalshiftval = 0;
    }
    else
#endif
    {
        globalshiftval = 32-globalshiftval;
        globalyscale = divscale(512,tspr->yrepeat,globalshiftval-19);
    }

    globalzd = ((int64_t)(globalposz-z1)*globalyscale)<<8;
    if ((cstat&8) > 0)
    {
        globalyscale = -globalyscale;
        globalzd = ((int64_t)(globalposz-z2)*globalyscale)<<8;
    }

    *z1ptr = z1;
    *z2ptr = z2;
}

//
// drawsprite (internal)
//
static void drawsprite_opengl(int32_t snum)
{
    //============================================================================= //POLYMOST BEGINS
#ifdef USE_OPENGL
    if (getrendermode() == REND_POLYMOST)
    {
        polymost_drawsprite(snum);
        bglDisable(GL_POLYGON_OFFSET_FILL);
    }
# ifdef POLYMER
    else if (getrendermode() == REND_POLYMER)
    {
        bglEnable(GL_ALPHA_TEST);
        bglEnable(GL_BLEND);

        polymer_drawsprite(snum);

        bglDisable(GL_BLEND);
        bglDisable(GL_ALPHA_TEST);
    }
# endif
#else
    UNREFERENCED_PARAMETER(snum);
#endif
    //============================================================================= //POLYMOST ENDS
}

static void drawsprite_classic(int32_t snum)
{
    int32_t xoff, yoff, xspan, yspan;
    int32_t x1, y1, x2, y2, lx, rx, dalx2, darx2, i, j, k, x;
    int32_t z, zz, z1, z2, xp1, yp1, xp2, yp2;
    int32_t dax, day, dax1, dax2, y;
    int32_t vtilenum = 0;

    spritetype *const tspr = tspriteptr[snum];

    const int32_t xb = spritesx[snum];
    const int32_t yp = spritesy[snum];
    const int32_t spritenum = tspr->owner;
    const int32_t sectnum = tspr->sectnum;
    const sectortype *const sec = (sectnum>=0) ? &sector[sectnum] : NULL;
    int32_t tilenum;
    int32_t cstat = tspr->cstat;

    if (sec == NULL)
        return;

    if (bad_tspr(tspr))
        return;

    DO_TILE_ANIM(tspr->picnum, spritenum+32768);

#ifdef USE_OPENGL
    {
        // hack pending proper alpha implentation
        // TODO: a real implementation
        float alpha = spriteext[spritenum].alpha;

        if (alpha >= 0.33f) // if alpha is 0 (which is the default) this structure should only necessitate one comparison
        {
            if ((cstat&2) && alpha >= 0.5f) // this covers the multiplicative aspect used in the Polymodes
                cstat |= 512;

            cstat |= 2;

            if (alpha >= 0.66f)
            {
                cstat |= 512;

                if (alpha >= 1.0f)
                    return;
            }

            tspr->cstat = cstat;
        }
    }
#endif

    tilenum = tspr->picnum;

    if ((cstat&48)==48)
        vtilenum = tilenum; // if the game wants voxels, it gets voxels
    else if (usevoxels && tiletovox[tilenum] != -1
#ifdef USE_OPENGL
             && (!(spriteext[spritenum].flags&SPREXT_NOTMD))
#endif
            )
    {
        vtilenum = tiletovox[tilenum];
        cstat |= 48;
    }

    if ((cstat&48) != 48)
    {
        if (spritenum < 0 || tilesizx[tilenum] <= 0 || tilesizy[tilenum] <= 0)
            return;
    }

    if (tspr->xrepeat <= 0 || tspr->yrepeat <= 0)
        return;

    globalpal = tspr->pal;
    if (palookup[globalpal] == NULL) globalpal = 0;    // JBF: fixes null-pointer crash
    globalshade = tspr->shade;

    if (cstat&2)
    {
        if (cstat&512) settransreverse(); else settransnormal();
    }

    xoff = picanm[tilenum].xofs + tspr->xoffset;
    yoff = picanm[tilenum].yofs + tspr->yoffset;

    if ((cstat&48) == 0)
    {
        int32_t daclip, startum, startdm, siz;
        int32_t xv, linum, linuminc;
        int32_t xsiz, ysiz;

draw_as_face_sprite:
        if (yp <= (4<<8)) return;

        siz = divscale19(xdimenscale,yp);

        xv = mulscale16(((int32_t)tspr->xrepeat)<<16,xyaspect);

        xspan = tilesizx[tilenum];
        yspan = tilesizy[tilenum];
        xsiz = mulscale30(siz,xv*xspan);
        ysiz = mulscale14(siz,tspr->yrepeat*yspan);

        if ((tilesizx[tilenum]>>11) >= xsiz || yspan >= (ysiz>>1))
            return;  //Watch out for divscale overflow

        x1 = xb-(xsiz>>1);
        if (xspan&1) x1 += mulscale31(siz,xv);  //Odd xspans
        i = mulscale30(siz,xv*xoff);
        if ((cstat&4) == 0) x1 -= i; else x1 += i;

        y1 = mulscale16(tspr->z-globalposz,siz);
        y1 -= mulscale14(siz,tspr->yrepeat*yoff);
        y1 += (globalhoriz<<8)-ysiz;
        if (cstat&128)
        {
            y1 += (ysiz>>1);
            if (yspan&1) y1 += mulscale15(siz,tspr->yrepeat);  //Odd yspans
        }

        x2 = x1+xsiz-1;
        y2 = y1+ysiz-1;
        if ((y1|255) >= (y2|255)) return;

        lx = (x1>>8)+1; if (lx < 0) lx = 0;
        rx = (x2>>8); if (rx >= xdimen) rx = xdimen-1;
        if (lx > rx) return;

        if ((sec->ceilingstat&3) == 0)
            startum = globalhoriz+mulscale24(siz,sec->ceilingz-globalposz)-1;
        else
            startum = 0;
        if ((sec->floorstat&3) == 0)
            startdm = globalhoriz+mulscale24(siz,sec->floorz-globalposz)+1;
        else
            startdm = INT32_MAX;
        if ((y1>>8) > startum) startum = (y1>>8);
        if ((y2>>8) < startdm) startdm = (y2>>8);

        if (startum < -32768) startum = -32768;
        if (startdm > 32767) startdm = 32767;
        if (startum >= startdm) return;

        if ((cstat&4) == 0)
        {
            linuminc = divscale24(xspan,xsiz);
            linum = mulscale8((lx<<8)-x1,linuminc);
        }
        else
        {
            linuminc = -divscale24(xspan,xsiz);
            linum = mulscale8((lx<<8)-x2,linuminc);
        }

        if ((cstat&8) > 0)
            swaplong(&y1, &y2);

        for (x=lx; x<=rx; x++)
        {
            uwall[x] = max(startumost[x+windowx1]-windowy1,(int16_t)startum);
            dwall[x] = min(startdmost[x+windowx1]-windowy1,(int16_t)startdm);
        }

        daclip = 0;
        for (i=smostwallcnt-1; i>=0; i--)
        {
            if (smostwalltype[i]&daclip) continue;
            j = smostwall[i];
            if ((xb1[j] > rx) || (xb2[j] < lx)) continue;
            if ((yp <= yb1[j]) && (yp <= yb2[j])) continue;
            if (spritewallfront(tspr,(int32_t)thewall[j]) && ((yp <= yb1[j]) || (yp <= yb2[j]))) continue;

            dalx2 = max(xb1[j],lx); darx2 = min(xb2[j],rx);

            switch (smostwalltype[i])
            {
            case 0:
                if (dalx2 <= darx2)
                {
                    if ((dalx2 == lx) && (darx2 == rx)) return;
                    //clearbufbyte(&dwall[dalx2],(darx2-dalx2+1)*sizeof(dwall[0]),0L);
                    for (k=dalx2; k<=darx2; k++) dwall[k] = 0;
                }
                break;
            case 1:
                k = smoststart[i] - xb1[j];
                for (x=dalx2; x<=darx2; x++)
                    if (smost[k+x] > uwall[x]) uwall[x] = smost[k+x];
                if ((dalx2 == lx) && (darx2 == rx)) daclip |= 1;
                break;
            case 2:
                k = smoststart[i] - xb1[j];
                for (x=dalx2; x<=darx2; x++)
                    if (smost[k+x] < dwall[x]) dwall[x] = smost[k+x];
                if ((dalx2 == lx) && (darx2 == rx)) daclip |= 2;
                break;
            }
        }

        if (uwall[rx] >= dwall[rx])
        {
            for (x=lx; x<rx; x++)
                if (uwall[x] < dwall[x]) break;
            if (x == rx) return;
        }

        //sprite
#ifdef YAX_ENABLE
        if (yax_globallev==YAX_MAXDRAWS || searchit==2)
#endif
        if ((searchit >= 1) && (searchx >= lx) && (searchx <= rx))
            if ((searchy >= uwall[searchx]) && (searchy < dwall[searchx]))
            {
                searchsector = sectnum; searchwall = spritenum;
                searchstat = 3; searchit = 1;
            }

        setup_globals_sprite1(tspr, sec, yspan, yoff, tilenum, cstat, &z1, &z2);

        qinterpolatedown16((intptr_t)&lwall[lx],rx-lx+1,linum,linuminc);
        clearbuf(&swall[lx],rx-lx+1,mulscale19(yp,xdimscale));

        {
#ifdef HIGH_PRECISION_SPRITE
            union { float f; int32_t i; } sw = {
                // initialize the float of the union
                ((cstat&8) ? -1 : 1)
                * (float)yp * xdimscale
                * (1<<(22-19)) / (yspan*tspr->yrepeat)
            };

            clearbuf(&swallf[lx], rx-lx+1, sw.i);
#endif
        }

        drawing_sprite = 1;

        if ((cstat&2) == 0)
            maskwallscan(lx,rx, (cstat&8)==0);
        else
            transmaskwallscan(lx,rx, (cstat&8)==0);

        drawing_sprite = 0;
    }
    else if ((cstat&48) == 16)
    {
        int32_t swapped, top, bot, topinc, botinc;
        int32_t xv, yv, sx1, sx2, sy1, sy2;

        if ((cstat&4) > 0) xoff = -xoff;
        if ((cstat&8) > 0) yoff = -yoff;

        xspan = tilesizx[tilenum]; yspan = tilesizy[tilenum];
        xv = tspr->xrepeat*sintable[(tspr->ang+2560+1536)&2047];
        yv = tspr->xrepeat*sintable[(tspr->ang+2048+1536)&2047];
        i = (xspan>>1)+xoff;
        x1 = tspr->x-globalposx-mulscale16(xv,i); x2 = x1+mulscale16(xv,xspan);
        y1 = tspr->y-globalposy-mulscale16(yv,i); y2 = y1+mulscale16(yv,xspan);

        yp1 = dmulscale6(x1,cosviewingrangeglobalang,y1,sinviewingrangeglobalang);
        yp2 = dmulscale6(x2,cosviewingrangeglobalang,y2,sinviewingrangeglobalang);
        if ((yp1 <= 0) && (yp2 <= 0)) return;
        xp1 = dmulscale6(y1,cosglobalang,-x1,singlobalang);
        xp2 = dmulscale6(y2,cosglobalang,-x2,singlobalang);

        x1 += globalposx; y1 += globalposy;
        x2 += globalposx; y2 += globalposy;

        swapped = 0;
        if (dmulscale32(xp1,yp2,-xp2,yp1) >= 0)  //If wall's NOT facing you
        {
            if ((cstat&64) != 0) return;
            i = xp1, xp1 = xp2, xp2 = i;
            i = yp1, yp1 = yp2, yp2 = i;
            i = x1, x1 = x2, x2 = i;
            i = y1, y1 = y2, y2 = i;
            swapped = 1;
        }

        if (xp1 >= -yp1)
        {
            if (xp1 > yp1) return;

            if (yp1 == 0) return;
            sx1 = halfxdimen + scale(xp1,halfxdimen,yp1);
            if (xp1 >= 0) sx1++;   //Fix for SIGNED divide
            if (sx1 >= xdimen) sx1 = xdimen-1;
            sy1 = yp1;
        }
        else
        {
            if (xp2 < -yp2) return;
            sx1 = 0;
            i = yp1-yp2+xp1-xp2;
            if (i == 0) return;
            sy1 = yp1 + scale(yp2-yp1,xp1+yp1,i);
        }
        if (xp2 <= yp2)
        {
            if (xp2 < -yp2) return;

            if (yp2 == 0) return;
            sx2 = halfxdimen + scale(xp2,halfxdimen,yp2) - 1;
            if (xp2 >= 0) sx2++;   //Fix for SIGNED divide
            if (sx2 >= xdimen) sx2 = xdimen-1;
            sy2 = yp2;
        }
        else
        {
            if (xp1 > yp1) return;

            sx2 = xdimen-1;
            i = xp2-xp1+yp1-yp2;
            if (i == 0) return;
            sy2 = yp1 + scale(yp2-yp1,yp1-xp1,i);
        }

        if ((sy1 < 256) || (sy2 < 256) || (sx1 > sx2))
            return;

        topinc = -mulscale10(yp1,xspan);
        top = (((mulscale10(xp1,xdimen) - mulscale9(sx1-halfxdimen,yp1))*xspan)>>3);
        botinc = ((yp2-yp1)>>8);
        bot = mulscale11(xp1-xp2,xdimen) + mulscale2(sx1-halfxdimen,botinc);

        j = sx2+3;
        z = mulscale20(top,krecipasm(bot));
        lwall[sx1] = (z>>8);
        for (x=sx1+4; x<=j; x+=4)
        {
            top += topinc; bot += botinc;
            zz = z; z = mulscale20(top,krecipasm(bot));
            lwall[x] = (z>>8);
            i = ((z+zz)>>1);
            lwall[x-2] = (i>>8);
            lwall[x-3] = ((i+zz)>>9);
            lwall[x-1] = ((i+z)>>9);
        }

        if (lwall[sx1] < 0) lwall[sx1] = 0;
        if (lwall[sx2] >= xspan) lwall[sx2] = xspan-1;

        if ((swapped^((cstat&4)>0)) > 0)
        {
            j = xspan-1;
            for (x=sx1; x<=sx2; x++)
                lwall[x] = j-lwall[x];
        }

        // XXX: UNUSED?
        rx1[MAXWALLSB-1] = xp1; ry1[MAXWALLSB-1] = yp1;
        rx2[MAXWALLSB-1] = xp2; ry2[MAXWALLSB-1] = yp2;

        setup_globals_sprite1(tspr, sec, yspan, yoff, tilenum, cstat, &z1, &z2);

        if (((sec->ceilingstat&1) == 0) && (z1 < sec->ceilingz))
            z1 = sec->ceilingz;
        if (((sec->floorstat&1) == 0) && (z2 > sec->floorz))
            z2 = sec->floorz;

        xb1[MAXWALLSB-1] = sx1;
        xb2[MAXWALLSB-1] = sx2;
        yb1[MAXWALLSB-1] = sy1;
        yb2[MAXWALLSB-1] = sy2;
        owallmost(uwall, MAXWALLSB-1, z1-globalposz);
        owallmost(dwall, MAXWALLSB-1, z2-globalposz);

        {
            int32_t hplc = divscale19(xdimenscale,sy1);
            const int32_t hplc2 = divscale19(xdimenscale,sy2);
            int32_t hinc = sx2-sx1 ? (hplc2-hplc)/(sx2-sx1) : 0;

#ifdef HIGH_PRECISION_SPRITE
            const float cc = ((1<<19)*(float)xdimen*yxaspect)/320.f;
            float hplcf = cc/sy1;
            const float hincf = sx2-sx1 ? (cc/sy2 - hplcf)/(sx2-sx1) : 0;
            const float loopcc = ((cstat&8) ? -1 : 1)*((float)(1<<30)*(1<<24))
                / (yspan*tspr->yrepeat);
#endif
            for (i=sx1; i<=sx2; i++)
            {
                swall[i] = (krecipasm(hplc)<<2);
                hplc += hinc;
#ifdef HIGH_PRECISION_SPRITE
                swallf[i] = loopcc/hplcf;
                hplcf += hincf;
#endif
            }
        }

        for (i=smostwallcnt-1; i>=0; i--)
        {
            j = smostwall[i];

            if ((xb1[j] > sx2) || (xb2[j] < sx1)) continue;

            dalx2 = xb1[j]; darx2 = xb2[j];
            if (max(sy1,sy2) > min(yb1[j],yb2[j]))
            {
                if (min(sy1,sy2) > max(yb1[j],yb2[j]))
                {
                    x = INT32_MIN;
                }
                else
                {
                    x = thewall[j]; xp1 = wall[x].x; yp1 = wall[x].y;
                    x = wall[x].point2; xp2 = wall[x].x; yp2 = wall[x].y;

                    z1 = (xp2-xp1)*(y1-yp1) - (yp2-yp1)*(x1-xp1);
                    z2 = (xp2-xp1)*(y2-yp1) - (yp2-yp1)*(x2-xp1);
                    if ((z1^z2) >= 0)
                        x = (z1+z2);
                    else
                    {
                        z1 = (x2-x1)*(yp1-y1) - (y2-y1)*(xp1-x1);
                        z2 = (x2-x1)*(yp2-y1) - (y2-y1)*(xp2-x1);

                        if ((z1^z2) >= 0)
                            x = -(z1+z2);
                        else
                        {
                            if ((xp2-xp1)*(tspr->y-yp1) == (tspr->x-xp1)*(yp2-yp1))
                            {
                                if (wall[thewall[j]].nextsector == tspr->sectnum)
                                    x = INT32_MIN;
                                else
                                    x = INT32_MAX;
                            }
                            else
                            {
                                //INTERSECTION!
                                x = (xp1-globalposx) + scale(xp2-xp1,z1,z1-z2);
                                y = (yp1-globalposy) + scale(yp2-yp1,z1,z1-z2);

                                yp1 = dmulscale14(x,cosviewingrangeglobalang,y,sinviewingrangeglobalang);

                                if (yp1 > 0)
                                {
                                    xp1 = dmulscale14(y,cosglobalang,-x,singlobalang);

                                    x = halfxdimen + scale(xp1,halfxdimen,yp1);
                                    if (xp1 >= 0) x++;   //Fix for SIGNED divide

                                    if (z1 < 0)
                                        { if (dalx2 < x) dalx2 = x; }
                                    else
                                        { if (darx2 > x) darx2 = x; }
                                    x = INT32_MIN+1;
                                }
                                else
                                    x = INT32_MAX;
                            }
                        }
                    }
                }

                if (x < 0)
                {
                    if (dalx2 < sx1) dalx2 = sx1;
                    if (darx2 > sx2) darx2 = sx2;

                    switch (smostwalltype[i])
                    {
                    case 0:
                        if (dalx2 <= darx2)
                        {
                            if ((dalx2 == sx1) && (darx2 == sx2)) return;
                            //clearbufbyte(&dwall[dalx2],(darx2-dalx2+1)*sizeof(dwall[0]),0L);
                            for (k=dalx2; k<=darx2; k++) dwall[k] = 0;
                        }
                        break;
                    case 1:
                        k = smoststart[i] - xb1[j];
                        for (x=dalx2; x<=darx2; x++)
                            if (smost[k+x] > uwall[x]) uwall[x] = smost[k+x];
                        break;
                    case 2:
                        k = smoststart[i] - xb1[j];
                        for (x=dalx2; x<=darx2; x++)
                            if (smost[k+x] < dwall[x]) dwall[x] = smost[k+x];
                        break;
                    }
                }
            }
        }

        //sprite
#ifdef YAX_ENABLE
        if (yax_globallev==YAX_MAXDRAWS || searchit==2)
#endif
        if ((searchit >= 1) && (searchx >= sx1) && (searchx <= sx2))
            if ((searchy >= uwall[searchx]) && (searchy <= dwall[searchx]))
            {
                searchsector = sectnum; searchwall = spritenum;
                searchstat = 3; searchit = 1;
            }

        drawing_sprite = 1;

        if ((cstat&2) == 0)
            maskwallscan(sx1,sx2, (cstat&8)==0);
        else
            transmaskwallscan(sx1,sx2, (cstat&8)==0);

        drawing_sprite = 0;
    }
    else if ((cstat&48) == 32)
    {
        int32_t npoints, npoints2;
        int32_t zsgn, zzsgn, bot;
        int32_t cosang, sinang, lpoint, lmax, rpoint, rmax;

        if ((cstat&64) != 0)
            if ((globalposz > tspr->z) == ((cstat&8)==0))
                return;

        if ((cstat&4) > 0) xoff = -xoff;
        if ((cstat&8) > 0) yoff = -yoff;
        xspan = tilesizx[tilenum];
        yspan = tilesizy[tilenum];

        //Rotate center point
        dax = tspr->x-globalposx;
        day = tspr->y-globalposy;
        rzi[0] = dmulscale10(cosglobalang,dax,singlobalang,day);
        rxi[0] = dmulscale10(cosglobalang,day,-singlobalang,dax);

        //Get top-left corner
        i = ((tspr->ang+2048-globalang)&2047);
        cosang = sintable[(i+512)&2047]; sinang = sintable[i];
        dax = ((xspan>>1)+xoff)*tspr->xrepeat;
        day = ((yspan>>1)+yoff)*tspr->yrepeat;
        rzi[0] += dmulscale12(sinang,dax,cosang,day);
        rxi[0] += dmulscale12(sinang,day,-cosang,dax);

        //Get other 3 corners
        dax = xspan*tspr->xrepeat;
        day = yspan*tspr->yrepeat;
        rzi[1] = rzi[0]-mulscale12(sinang,dax);
        rxi[1] = rxi[0]+mulscale12(cosang,dax);
        dax = -mulscale12(cosang,day);
        day = -mulscale12(sinang,day);
        rzi[2] = rzi[1]+dax; rxi[2] = rxi[1]+day;
        rzi[3] = rzi[0]+dax; rxi[3] = rxi[0]+day;

        //Put all points on same z
        ryi[0] = scale((tspr->z-globalposz),yxaspect,320<<8);
        if (ryi[0] == 0) return;
        ryi[1] = ryi[2] = ryi[3] = ryi[0];

        if ((cstat&4) == 0)
            { z = 0; z1 = 1; z2 = 3; }
        else
            { z = 1; z1 = 0; z2 = 2; }

        dax = rzi[z1]-rzi[z]; day = rxi[z1]-rxi[z];
        bot = dmulscale8(dax,dax,day,day);
        if ((klabs(dax)>>13) >= bot || (klabs(day)>>13) >= bot)
            return;
        globalx1 = divscale18(dax,bot);
        globalx2 = divscale18(day,bot);

        dax = rzi[z2]-rzi[z]; day = rxi[z2]-rxi[z];
        bot = dmulscale8(dax,dax,day,day);
        if ((klabs(dax)>>13) >= bot || (klabs(day)>>13) >= bot)
            return;
        globaly1 = divscale18(dax,bot);
        globaly2 = divscale18(day,bot);

        //Calculate globals for hline texture mapping function
        globalxpanning = (rxi[z]<<12);
        globalypanning = (rzi[z]<<12);
        globalzd = (ryi[z]<<12);

        rzi[0] = mulscale16(rzi[0],viewingrange);
        rzi[1] = mulscale16(rzi[1],viewingrange);
        rzi[2] = mulscale16(rzi[2],viewingrange);
        rzi[3] = mulscale16(rzi[3],viewingrange);

        if (ryi[0] < 0)   //If ceilsprite is above you, reverse order of points
        {
            i = rxi[1]; rxi[1] = rxi[3]; rxi[3] = i;
            i = rzi[1]; rzi[1] = rzi[3]; rzi[3] = i;
        }


        //Clip polygon in 3-space
        npoints = 4;

        //Clip edge 1
        npoints2 = 0;
        zzsgn = rxi[0]+rzi[0];
        for (z=0; z<npoints; z++)
        {
            zz = z+1; if (zz == npoints) zz = 0;
            zsgn = zzsgn; zzsgn = rxi[zz]+rzi[zz];
            if (zsgn >= 0)
            {
                rxi2[npoints2] = rxi[z]; ryi2[npoints2] = ryi[z]; rzi2[npoints2] = rzi[z];
                npoints2++;
            }
            if ((zsgn^zzsgn) < 0)
            {
                int32_t t = divscale30(zsgn,zsgn-zzsgn);
                rxi2[npoints2] = rxi[z] + mulscale30(t,rxi[zz]-rxi[z]);
                ryi2[npoints2] = ryi[z] + mulscale30(t,ryi[zz]-ryi[z]);
                rzi2[npoints2] = rzi[z] + mulscale30(t,rzi[zz]-rzi[z]);
                npoints2++;
            }
        }
        if (npoints2 <= 2) return;

        //Clip edge 2
        npoints = 0;
        zzsgn = rxi2[0]-rzi2[0];
        for (z=0; z<npoints2; z++)
        {
            zz = z+1; if (zz == npoints2) zz = 0;
            zsgn = zzsgn; zzsgn = rxi2[zz]-rzi2[zz];
            if (zsgn <= 0)
            {
                rxi[npoints] = rxi2[z]; ryi[npoints] = ryi2[z]; rzi[npoints] = rzi2[z];
                npoints++;
            }
            if ((zsgn^zzsgn) < 0)
            {
                int32_t t = divscale30(zsgn,zsgn-zzsgn);
                rxi[npoints] = rxi2[z] + mulscale30(t,rxi2[zz]-rxi2[z]);
                ryi[npoints] = ryi2[z] + mulscale30(t,ryi2[zz]-ryi2[z]);
                rzi[npoints] = rzi2[z] + mulscale30(t,rzi2[zz]-rzi2[z]);
                npoints++;
            }
        }
        if (npoints <= 2) return;

        //Clip edge 3
        npoints2 = 0;
        zzsgn = ryi[0]*halfxdimen + (rzi[0]*(globalhoriz-0));
        for (z=0; z<npoints; z++)
        {
            zz = z+1; if (zz == npoints) zz = 0;
            zsgn = zzsgn; zzsgn = ryi[zz]*halfxdimen + (rzi[zz]*(globalhoriz-0));
            if (zsgn >= 0)
            {
                rxi2[npoints2] = rxi[z];
                ryi2[npoints2] = ryi[z];
                rzi2[npoints2] = rzi[z];
                npoints2++;
            }
            if ((zsgn^zzsgn) < 0)
            {
                int32_t t = divscale30(zsgn,zsgn-zzsgn);
                rxi2[npoints2] = rxi[z] + mulscale30(t,rxi[zz]-rxi[z]);
                ryi2[npoints2] = ryi[z] + mulscale30(t,ryi[zz]-ryi[z]);
                rzi2[npoints2] = rzi[z] + mulscale30(t,rzi[zz]-rzi[z]);
                npoints2++;
            }
        }
        if (npoints2 <= 2) return;

        //Clip edge 4
        npoints = 0;
        zzsgn = ryi2[0]*halfxdimen + (rzi2[0]*(globalhoriz-ydimen));
        for (z=0; z<npoints2; z++)
        {
            zz = z+1; if (zz == npoints2) zz = 0;
            zsgn = zzsgn; zzsgn = ryi2[zz]*halfxdimen + (rzi2[zz]*(globalhoriz-ydimen));
            if (zsgn <= 0)
            {
                rxi[npoints] = rxi2[z];
                ryi[npoints] = ryi2[z];
                rzi[npoints] = rzi2[z];
                npoints++;
            }
            if ((zsgn^zzsgn) < 0)
            {
                int32_t t = divscale30(zsgn,zsgn-zzsgn);
                rxi[npoints] = rxi2[z] + mulscale30(t,rxi2[zz]-rxi2[z]);
                ryi[npoints] = ryi2[z] + mulscale30(t,ryi2[zz]-ryi2[z]);
                rzi[npoints] = rzi2[z] + mulscale30(t,rzi2[zz]-rzi2[z]);
                npoints++;
            }
        }
        if (npoints <= 2) return;

        //Project onto screen
        lpoint = -1; lmax = INT32_MAX;
        rpoint = -1; rmax = INT32_MIN;
        for (z=0; z<npoints; z++)
        {
            xsi[z] = scale(rxi[z],xdimen<<15,rzi[z]) + (xdimen<<15);
            ysi[z] = scale(ryi[z],xdimen<<15,rzi[z]) + (globalhoriz<<16);
            if (xsi[z] < 0) xsi[z] = 0;
            if (xsi[z] > (xdimen<<16)) xsi[z] = (xdimen<<16);
            if (ysi[z] < ((int32_t)0<<16)) ysi[z] = ((int32_t)0<<16);
            if (ysi[z] > ((int32_t)ydimen<<16)) ysi[z] = ((int32_t)ydimen<<16);
            if (xsi[z] < lmax) lmax = xsi[z], lpoint = z;
            if (xsi[z] > rmax) rmax = xsi[z], rpoint = z;
        }

        //Get uwall arrays
        for (z=lpoint; z!=rpoint; z=zz)
        {
            zz = z+1; if (zz == npoints) zz = 0;

            dax1 = ((xsi[z]+65535)>>16);
            dax2 = ((xsi[zz]+65535)>>16);
            if (dax2 > dax1)
            {
                int32_t yinc = divscale16(ysi[zz]-ysi[z],xsi[zz]-xsi[z]);
                y = ysi[z] + mulscale16((dax1<<16)-xsi[z],yinc);
                qinterpolatedown16short((intptr_t)(&uwall[dax1]),dax2-dax1,y,yinc);
            }
        }

        //Get dwall arrays
        for (; z!=lpoint; z=zz)
        {
            zz = z+1; if (zz == npoints) zz = 0;

            dax1 = ((xsi[zz]+65535)>>16);
            dax2 = ((xsi[z]+65535)>>16);
            if (dax2 > dax1)
            {
                int32_t yinc = divscale16(ysi[zz]-ysi[z],xsi[zz]-xsi[z]);
                y = ysi[zz] + mulscale16((dax1<<16)-xsi[zz],yinc);
                qinterpolatedown16short((intptr_t)(&dwall[dax1]),dax2-dax1,y,yinc);
            }
        }


        lx = ((lmax+65535)>>16);
        rx = ((rmax+65535)>>16);
        for (x=lx; x<=rx; x++)
        {
            uwall[x] = max(uwall[x],startumost[x+windowx1]-windowy1);
            dwall[x] = min(dwall[x],startdmost[x+windowx1]-windowy1);
        }

        //Additional uwall/dwall clipping goes here
        for (i=smostwallcnt-1; i>=0; i--)
        {
            j = smostwall[i];
            if ((xb1[j] > rx) || (xb2[j] < lx)) continue;
            if ((yp <= yb1[j]) && (yp <= yb2[j])) continue;

            //if (spritewallfront(tspr,thewall[j]) == 0)
            x = thewall[j]; xp1 = wall[x].x; yp1 = wall[x].y;
            x = wall[x].point2; xp2 = wall[x].x; yp2 = wall[x].y;
            x = (xp2-xp1)*(tspr->y-yp1)-(tspr->x-xp1)*(yp2-yp1);
            if ((yp > yb1[j]) && (yp > yb2[j])) x = -1;
            if ((x >= 0) && ((x != 0) || (wall[thewall[j]].nextsector != tspr->sectnum))) continue;

            dalx2 = max(xb1[j],lx); darx2 = min(xb2[j],rx);

            switch (smostwalltype[i])
            {
            case 0:
                if (dalx2 <= darx2)
                {
                    if ((dalx2 == lx) && (darx2 == rx)) return;
                    //clearbufbyte(&dwall[dalx2],(darx2-dalx2+1)*sizeof(dwall[0]),0L);
                    for (x=dalx2; x<=darx2; x++) dwall[x] = 0;
                }
                break;
            case 1:
                k = smoststart[i] - xb1[j];
                for (x=dalx2; x<=darx2; x++)
                    if (smost[k+x] > uwall[x]) uwall[x] = smost[k+x];
                break;
            case 2:
                k = smoststart[i] - xb1[j];
                for (x=dalx2; x<=darx2; x++)
                    if (smost[k+x] < dwall[x]) dwall[x] = smost[k+x];
                break;
            }
        }

        //sprite
#ifdef YAX_ENABLE
        if (yax_globallev==YAX_MAXDRAWS || searchit==2)
#endif
        if ((searchit >= 1) && (searchx >= lx) && (searchx <= rx))
            if ((searchy >= uwall[searchx]) && (searchy <= dwall[searchx]))
            {
                searchsector = sectnum; searchwall = spritenum;
                searchstat = 3; searchit = 1;
            }

        globalorientation = cstat;
        globalpicnum = tilenum;
        if ((unsigned)globalpicnum >= (unsigned)MAXTILES) globalpicnum = 0;

        if (waloff[globalpicnum] == 0) loadtile(globalpicnum);
        setgotpic(globalpicnum);
        globalbufplc = waloff[globalpicnum];

        globvis = mulscale16(globalhisibility,viewingrange);
        if (sec->visibility != 0) globvis = mulscale4(globvis, (uint8_t)(sec->visibility+16));

        x = picsiz[globalpicnum]; y = ((x>>4)&15); x &= 15;
#if 0
        if (pow2long[x] != xspan)
        {
            x++;
            globalx1 = mulscale(globalx1,xspan,x);
            globalx2 = mulscale(globalx2,xspan,x);
        }
#endif
        dax = globalxpanning; day = globalypanning;
        globalxpanning = -dmulscale6(globalx1,day,globalx2,dax);
        globalypanning = -dmulscale6(globaly1,day,globaly2,dax);

        globalx2 = mulscale16(globalx2,viewingrange);
        globaly2 = mulscale16(globaly2,viewingrange);
        globalzd = mulscale16(globalzd,viewingrangerecip);

        globalx1 = (globalx1-globalx2)*halfxdimen;
        globaly1 = (globaly1-globaly2)*halfxdimen;

        if ((cstat&2) == 0)
            msethlineshift(x,y);
        else
            tsethlineshift(x,y);

        globalispow2 = (pow2long[x]==xspan && pow2long[y]==yspan);
        globalxspan = xspan;
        globalyspan = yspan;

        //Draw it!
        ceilspritescan(lx,rx-1);
        globalispow2 = 1;
    }
    else if ((cstat&48) == 48)
    {
        int32_t nxrepeat, nyrepeat;
        int32_t daxrepeat = tspr->xrepeat;
        const int32_t *longptr;

        if ((sprite[spritenum].cstat&48)==16)
            daxrepeat = (daxrepeat*5)/4;

        lx = 0; rx = xdim-1;
        for (x=lx; x<=rx; x++)
        {
            lwall[x] = startumost[x+windowx1]-windowy1;
            swall[x] = startdmost[x+windowx1]-windowy1;
        }
        for (i=smostwallcnt-1; i>=0; i--)
        {
            j = smostwall[i];
            if ((xb1[j] > rx) || (xb2[j] < lx)) continue;
            if ((yp <= yb1[j]) && (yp <= yb2[j])) continue;
            if (spritewallfront(tspr,(int32_t)thewall[j]) && ((yp <= yb1[j]) || (yp <= yb2[j]))) continue;

            dalx2 = max(xb1[j],lx); darx2 = min(xb2[j],rx);

            switch (smostwalltype[i])
            {
            case 0:
                if (dalx2 <= darx2)
                {
                    if ((dalx2 == lx) && (darx2 == rx)) return;
                    //clearbufbyte(&swall[dalx2],(darx2-dalx2+1)*sizeof(swall[0]),0L);
                    for (x=dalx2; x<=darx2; x++) swall[x] = 0;
                }
                break;
            case 1:
                k = smoststart[i] - xb1[j];
                for (x=dalx2; x<=darx2; x++)
                    if (smost[k+x] > lwall[x]) lwall[x] = smost[k+x];
                break;
            case 2:
                k = smoststart[i] - xb1[j];
                for (x=dalx2; x<=darx2; x++)
                    if (smost[k+x] < swall[x]) swall[x] = smost[k+x];
                break;
            }
        }

        if (lwall[rx] >= swall[rx])
        {
            for (x=lx; x<rx; x++)
                if (lwall[x] < swall[x]) break;
            if (x == rx) return;
        }
/*
        for (i=0; i<MAXVOXMIPS; i++)
            if (!voxoff[vtilenum][i])
            {
                kloadvoxel(vtilenum);
                break;
            }
*/
        longptr = (const int32_t *)voxoff[vtilenum][0];
        if (longptr == NULL)
        {
            globalshade = 32;
            tspr->xrepeat = tspr->yrepeat = 255;
            goto draw_as_face_sprite;
        }

        if (voxscale[vtilenum] == 65536)
        {
            nxrepeat = (daxrepeat<<16);
            nyrepeat = (((int32_t)tspr->yrepeat)<<16);
        }
        else
        {
            nxrepeat = daxrepeat*voxscale[vtilenum];
            nyrepeat = ((int32_t)tspr->yrepeat)*voxscale[vtilenum];
        }

        if (!(cstat&128)) tspr->z -= mulscale22(B_LITTLE32(longptr[5]),nyrepeat);
        yoff = /*picanm[sprite[tspr->owner].picnum].yofs +*/ tspr->yoffset;
        tspr->z -= mulscale14(yoff,nyrepeat);

        globvis = globalvisibility;
        if (sec->visibility != 0) globvis = mulscale4(globvis, (uint8_t)(sec->visibility+16));

#ifdef YAX_ENABLE
        if (yax_globallev==YAX_MAXDRAWS || searchit==2)
#endif
        if ((searchit >= 1) && (yp > (4<<8)) && (searchy >= lwall[searchx]) && (searchy < swall[searchx]))
        {
            const int32_t siz = divscale19(xdimenscale,yp);
            const int32_t xv = mulscale16(nxrepeat,xyaspect);
            int32_t xsiz, ysiz;

            xspan = ((B_LITTLE32(longptr[0])+B_LITTLE32(longptr[1]))>>1);
            yspan = B_LITTLE32(longptr[2]);
            xsiz = mulscale30(siz,xv*xspan);
            ysiz = mulscale30(siz,nyrepeat*yspan);

            //Watch out for divscale overflow
            if (((xspan>>11) < xsiz) && (yspan < (ysiz>>1)))
            {
                x1 = xb-(xsiz>>1);
                if (xspan&1) x1 += mulscale31(siz,xv);  //Odd xspans
                i = mulscale30(siz,xv*xoff);
                if ((cstat&4) == 0) x1 -= i; else x1 += i;

                y1 = mulscale16(tspr->z-globalposz,siz);
                //y1 -= mulscale30(siz,nyrepeat*yoff);
                y1 += (globalhoriz<<8)-ysiz;
                //if (cstat&128)  //Already fixed up above
                y1 += (ysiz>>1);

                x2 = x1+xsiz-1;
                y2 = y1+ysiz-1;
                if ((y1|255) < (y2|255) && searchx >= (x1>>8)+1 && searchx <= (x2>>8))
                {
                    int32_t startum, startdm;

                    if ((sec->ceilingstat&3) == 0)
                        startum = globalhoriz+mulscale24(siz,sec->ceilingz-globalposz)-1;
                    else
                        startum = 0;

                    if ((sec->floorstat&3) == 0)
                        startdm = globalhoriz+mulscale24(siz,sec->floorz-globalposz)+1;
                    else
                        startdm = INT32_MAX;

                    //sprite
                    if (searchy >= max(startum,(y1>>8)) && searchy < min(startdm,(y2>>8)))
                    {
                        searchsector = sectnum; searchwall = spritenum;
                        searchstat = 3; searchit = 1;
                    }
                }
            }
        }

        i = (int32_t)tspr->ang+1536;
#ifdef USE_OPENGL
        i += spriteext[spritenum].angoff;
#endif
        drawvox(tspr->x,tspr->y,tspr->z,i,daxrepeat,(int32_t)tspr->yrepeat,vtilenum,tspr->shade,tspr->pal,lwall,swall);
    }
}

static void drawsprite(int32_t snum)
{
    if (getrendermode() >= REND_POLYMOST)
        drawsprite_opengl(snum);
    else
        drawsprite_classic(snum);
}


//
// drawmaskwall (internal)
//
static void drawmaskwall(int16_t damaskwallcnt)
{
    int32_t i, j, k, x, z, sectnum, z1, z2, lx, rx;
    sectortype *sec, *nsec;
    walltype *wal;

    //============================================================================= //POLYMOST BEGINS
#ifdef USE_OPENGL
    if (getrendermode() == REND_POLYMOST) { polymost_drawmaskwall(damaskwallcnt); return; }
# ifdef POLYMER
    if (getrendermode() == REND_POLYMER)
    {
        bglEnable(GL_ALPHA_TEST);
        bglEnable(GL_BLEND);

        polymer_drawmaskwall(damaskwallcnt);

        bglDisable(GL_BLEND);
        bglDisable(GL_ALPHA_TEST);

        return;
    }
#endif
#endif
    //============================================================================= //POLYMOST ENDS

    z = maskwall[damaskwallcnt];
    wal = &wall[thewall[z]];
    sectnum = thesector[z]; sec = &sector[sectnum];
    nsec = &sector[wal->nextsector];
    z1 = max(nsec->ceilingz,sec->ceilingz);
    z2 = min(nsec->floorz,sec->floorz);

    wallmost(uwall,z,sectnum,(uint8_t)0);
    wallmost(uplc,z,(int32_t)wal->nextsector,(uint8_t)0);
    for (x=xb1[z]; x<=xb2[z]; x++)
        if (uplc[x] > uwall[x])
            uwall[x] = uplc[x];
    wallmost(dwall,z,sectnum,(uint8_t)1);
    wallmost(dplc,z,(int32_t)wal->nextsector,(uint8_t)1);
    for (x=xb1[z]; x<=xb2[z]; x++)
        if (dplc[x] < dwall[x])
            dwall[x] = dplc[x];
    prepwall(z,wal);

    setup_globals_wall1(wal, wal->overpicnum);
    setup_globals_wall2(wal, sec->visibility, z1, z2);

    for (i=smostwallcnt-1; i>=0; i--)
    {
        j = smostwall[i];
        if ((xb1[j] > xb2[z]) || (xb2[j] < xb1[z])) continue;
        if (wallfront(j,z)) continue;

        lx = max(xb1[j],xb1[z]); rx = min(xb2[j],xb2[z]);

        switch (smostwalltype[i])
        {
        case 0:
            if (lx <= rx)
            {
                if ((lx == xb1[z]) && (rx == xb2[z])) return;
                //clearbufbyte(&dwall[lx],(rx-lx+1)*sizeof(dwall[0]),0L);
                for (x=lx; x<=rx; x++) dwall[x] = 0;
            }
            break;
        case 1:
            k = smoststart[i] - xb1[j];
            for (x=lx; x<=rx; x++)
                if (smost[k+x] > uwall[x]) uwall[x] = smost[k+x];
            break;
        case 2:
            k = smoststart[i] - xb1[j];
            for (x=lx; x<=rx; x++)
                if (smost[k+x] < dwall[x]) dwall[x] = smost[k+x];
            break;
        }
    }

    //maskwall
    if ((searchit >= 1) && (searchx >= xb1[z]) && (searchx <= xb2[z]))
        if ((searchy >= uwall[searchx]) && (searchy <= dwall[searchx]))
        {
            searchsector = sectnum; searchbottomwall = searchwall = thewall[z];
            searchstat = 4; searchit = 1;
        }

    if ((globalorientation&128) == 0)
    {
        maskwallscan(xb1[z],xb2[z], 0);
    }
    else
    {
        if (globalorientation&128)
        {
            if (globalorientation&512) settransreverse(); else settransnormal();
        }

        transmaskwallscan(xb1[z],xb2[z], 0);
    }
}


//
// fillpolygon (internal)
//
static void fillpolygon(int32_t npoints)
{
    int32_t i, z, y, miny, maxy;

    // fix for bad next-point (xb1) values...
    for (z=0; z<npoints; z++)
        if ((unsigned)xb1[z] >= (unsigned)npoints)
            xb1[z] = 0;

#ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST && in3dmode())
    {
        polymost_fillpolygon(npoints);
        return;
    }
#endif

    // 1. Calculate y bounds.
    miny = INT32_MAX; maxy = INT32_MIN;
    for (z=npoints-1; z>=0; z--)
    {
        y = ry1[z];
        miny = min(miny,y);
        maxy = max(maxy,y);
    }

    miny >>= 12;
    maxy >>= 12;

    if (miny < 0)
        miny = 0;
    if (maxy >= ydim)
        maxy = ydim-1;

    for (i=0, y=miny; y<=maxy; y++, i++)
    {
        //They're pointers! - watch how you optimize this thing
        dotp1[y] = &smost[i*MAXNODESPERLINE];
        dotp2[y] = &smost[i*MAXNODESPERLINE + (MAXNODESPERLINE>>1)];
    }

    for (z=npoints-1; z>=0; z--)
    {
        const int32_t zz=xb1[z];

        // NOTE: clamp for crash prevention... :-/
        // r1874 says: "Fix more overheadmap crashes, this time with 'Last
        // Pissed Time'"
        const int32_t y1 = clamp(ry1[z], 0, (ydim<<12)-1);
        const int32_t y2 = clamp(ry1[zz], 0, (ydim<<12)-1);

        const int32_t day1 = y1>>12;
        const int32_t day2 = y2>>12;

        if (day1 != day2)
        {
            int32_t x1=rx1[z], x2=rx1[zz];
            const int32_t xinc = divscale12(x2-x1, y2-y1);

            if (day2 > day1)
            {
                x1 += mulscale12((day1<<12)+4095-y1, xinc);
                for (y=day1; y<day2; y++)
                {
                    if (dotp2[y])
                        *(dotp2[y]++) = x1>>12;
                    x1 += xinc;
                }
            }
            else
            {
                x2 += mulscale12((day2<<12)+4095-y2, xinc);
                for (y=day2; y<day1; y++)
                {
                    if (dotp1[y])
                        *(dotp1[y]++) = x2>>12;
                    x2 += xinc;
                }
            }
        }
    }

    globalx1 = mulscale16(globalx1,xyaspect);
    globaly2 = mulscale16(globaly2,xyaspect);

    {
        const int32_t oy = miny+1-(ydim>>1);
        globalposx += oy*(int64_t)globalx1;
        globalposy += oy*(int64_t)globaly2;
    }

    setuphlineasm4(asm1,asm2);

    for (i=0, y=miny; y<=maxy; y++, i++)
    {
        int16_t *const xptr = &smost[i*MAXNODESPERLINE];
        int16_t *const xptr2 = &smost[i*MAXNODESPERLINE + (MAXNODESPERLINE>>1)];

        const int32_t cnt = dotp1[y]-xptr;

        for (z=cnt-1; z>=0; z--)
        {
            int32_t x1, x2;
            int32_t zz, i1=0, i2=0;  // point indices (like loop z)

            for (zz=z; zz>0; zz--)
            {
                if (xptr[zz] < xptr[i1])
                    i1 = zz;
                if (xptr2[zz] < xptr2[i2])
                    i2 = zz;
            }

            x1 = xptr[i1];
            xptr[i1] = xptr[z];

            x2 = xptr2[i2]-1;
            xptr2[i2] = xptr2[z];

            if (x1 > x2)
                continue;

            if ((unsigned)x1 >= xdim+0u || (unsigned)x2 >= xdim+0u)
                continue;

            if (globalpolytype < 1)
            {
                //maphline
                const int32_t ox = x2+1-(xdim>>1);
                const int32_t bx = ox*asm1 + globalposx;
                const int32_t by = ox*asm2 - globalposy;

                const intptr_t p = ylookup[y]+x2+frameplace;

                hlineasm4(x2-x1,-1L,globalshade<<8,by,bx,p);
            }
            else
            {
                //maphline
                const int32_t ox = x1+1-(xdim>>1);
                const int32_t bx = ox*asm1 + globalposx;
                const int32_t by = ox*asm2 - globalposy;

                const intptr_t p = ylookup[y]+x1+frameplace;

                if (globalpolytype == 1)
                    mhline(globalbufplc,bx,(x2-x1)<<16,0L,by,p);
                else
                    thline(globalbufplc,bx,(x2-x1)<<16,0L,by,p);
            }
        }

        globalposx += (int64_t)globalx1;
        globalposy += (int64_t)globaly2;
    }

    faketimerhandler();
}

static inline int32_t addscaleclamp(int32_t a, int32_t b, int32_t s1, int32_t s2)
{
    // a + scale(b, s1, s1-s2), but without arithmetic exception when the
    // scale() expression overflows

    double tmp = (double)a + ((double)b*s1)/(s1-s2);

    if (tmp <= INT32_MIN+1)
        return INT32_MIN+1;
    if (tmp >= INT32_MAX)
        return INT32_MAX;
    return tmp;
}

//
// clippoly (internal)
//
static int32_t clippoly(int32_t npoints, int32_t clipstat)
{
    int32_t z, zz, s1, s2, t, npoints2, start2, z1, z2, z3, z4, splitcnt;
    int32_t cx1, cy1, cx2, cy2;

    cx1 = windowx1;
    cy1 = windowy1;
    cx2 = windowx2+1;
    cy2 = windowy2+1;
    cx1 <<= 12; cy1 <<= 12; cx2 <<= 12; cy2 <<= 12;

    if (clipstat&0xa)   //Need to clip top or left
    {
        npoints2 = 0; start2 = 0; z = 0; splitcnt = 0;
        do
        {
            s2 = cx1-rx1[z];
            do
            {
                zz = xb1[z]; xb1[z] = -1;
                s1 = s2; s2 = cx1-rx1[zz];
                if (s1 < 0)
                {
                    rx2[npoints2] = rx1[z]; ry2[npoints2] = ry1[z];
                    xb2[npoints2] = npoints2+1; npoints2++;
                }
                if ((s1^s2) < 0)
                {
                    rx2[npoints2] = addscaleclamp(rx1[z], rx1[zz]-rx1[z], s1, s2);
                    ry2[npoints2] = addscaleclamp(ry1[z], ry1[zz]-ry1[z], s1, s2);
                    if (s1 < 0) p2[splitcnt++] = npoints2;
                    xb2[npoints2] = npoints2+1;
                    npoints2++;
                }
                z = zz;
            }
            while (xb1[z] >= 0);

            if (npoints2 >= start2+3)
                xb2[npoints2-1] = start2, start2 = npoints2;
            else
                npoints2 = start2;

            z = 1;
            while ((z < npoints) && (xb1[z] < 0)) z++;
        }
        while (z < npoints);
        if (npoints2 <= 2) return(0);

        for (z=1; z<splitcnt; z++)
            for (zz=0; zz<z; zz++)
            {
                z1 = p2[z]; z2 = xb2[z1]; z3 = p2[zz]; z4 = xb2[z3];
                s1  = klabs(rx2[z1]-rx2[z2])+klabs(ry2[z1]-ry2[z2]);
                s1 += klabs(rx2[z3]-rx2[z4])+klabs(ry2[z3]-ry2[z4]);
                s2  = klabs(rx2[z1]-rx2[z4])+klabs(ry2[z1]-ry2[z4]);
                s2 += klabs(rx2[z3]-rx2[z2])+klabs(ry2[z3]-ry2[z2]);
                if (s2 < s1)
                    { t = xb2[p2[z]]; xb2[p2[z]] = xb2[p2[zz]]; xb2[p2[zz]] = t; }
            }


        npoints = 0; start2 = 0; z = 0; splitcnt = 0;
        do
        {
            s2 = cy1-ry2[z];
            do
            {
                zz = xb2[z]; xb2[z] = -1;
                s1 = s2; s2 = cy1-ry2[zz];
                if (s1 < 0)
                {
                    rx1[npoints] = rx2[z]; ry1[npoints] = ry2[z];
                    xb1[npoints] = npoints+1; npoints++;
                }
                if ((s1^s2) < 0)
                {
                    rx1[npoints] = addscaleclamp(rx2[z], rx2[zz]-rx2[z], s1, s2);
                    ry1[npoints] = addscaleclamp(ry2[z], ry2[zz]-ry2[z], s1, s2);
                    if (s1 < 0) p2[splitcnt++] = npoints;
                    xb1[npoints] = npoints+1;
                    npoints++;
                }
                z = zz;
            }
            while (xb2[z] >= 0);

            if (npoints >= start2+3)
                xb1[npoints-1] = start2, start2 = npoints;
            else
                npoints = start2;

            z = 1;
            while ((z < npoints2) && (xb2[z] < 0)) z++;
        }
        while (z < npoints2);
        if (npoints <= 2) return(0);

        for (z=1; z<splitcnt; z++)
            for (zz=0; zz<z; zz++)
            {
                z1 = p2[z]; z2 = xb1[z1]; z3 = p2[zz]; z4 = xb1[z3];
                s1  = klabs(rx1[z1]-rx1[z2])+klabs(ry1[z1]-ry1[z2]);
                s1 += klabs(rx1[z3]-rx1[z4])+klabs(ry1[z3]-ry1[z4]);
                s2  = klabs(rx1[z1]-rx1[z4])+klabs(ry1[z1]-ry1[z4]);
                s2 += klabs(rx1[z3]-rx1[z2])+klabs(ry1[z3]-ry1[z2]);
                if (s2 < s1)
                    { t = xb1[p2[z]]; xb1[p2[z]] = xb1[p2[zz]]; xb1[p2[zz]] = t; }
            }
    }
    if (clipstat&0x5)   //Need to clip bottom or right
    {
        npoints2 = 0; start2 = 0; z = 0; splitcnt = 0;
        do
        {
            s2 = rx1[z]-cx2;
            do
            {
                zz = xb1[z]; xb1[z] = -1;
                s1 = s2; s2 = rx1[zz]-cx2;
                if (s1 < 0)
                {
                    rx2[npoints2] = rx1[z]; ry2[npoints2] = ry1[z];
                    xb2[npoints2] = npoints2+1; npoints2++;
                }
                if ((s1^s2) < 0)
                {
                    rx2[npoints2] = addscaleclamp(rx1[z], rx1[zz]-rx1[z], s1, s2);
                    ry2[npoints2] = addscaleclamp(ry1[z], ry1[zz]-ry1[z], s1, s2);
                    if (s1 < 0) p2[splitcnt++] = npoints2;
                    xb2[npoints2] = npoints2+1;
                    npoints2++;
                }
                z = zz;
            }
            while (xb1[z] >= 0);

            if (npoints2 >= start2+3)
                xb2[npoints2-1] = start2, start2 = npoints2;
            else
                npoints2 = start2;

            z = 1;
            while ((z < npoints) && (xb1[z] < 0)) z++;
        }
        while (z < npoints);
        if (npoints2 <= 2) return(0);

        for (z=1; z<splitcnt; z++)
            for (zz=0; zz<z; zz++)
            {
                z1 = p2[z]; z2 = xb2[z1]; z3 = p2[zz]; z4 = xb2[z3];
                s1  = klabs(rx2[z1]-rx2[z2])+klabs(ry2[z1]-ry2[z2]);
                s1 += klabs(rx2[z3]-rx2[z4])+klabs(ry2[z3]-ry2[z4]);
                s2  = klabs(rx2[z1]-rx2[z4])+klabs(ry2[z1]-ry2[z4]);
                s2 += klabs(rx2[z3]-rx2[z2])+klabs(ry2[z3]-ry2[z2]);
                if (s2 < s1)
                    { t = xb2[p2[z]]; xb2[p2[z]] = xb2[p2[zz]]; xb2[p2[zz]] = t; }
            }


        npoints = 0; start2 = 0; z = 0; splitcnt = 0;
        do
        {
            s2 = ry2[z]-cy2;
            do
            {
                zz = xb2[z]; xb2[z] = -1;
                s1 = s2; s2 = ry2[zz]-cy2;
                if (s1 < 0)
                {
                    rx1[npoints] = rx2[z]; ry1[npoints] = ry2[z];
                    xb1[npoints] = npoints+1; npoints++;
                }
                if ((s1^s2) < 0)
                {
                    rx1[npoints] = addscaleclamp(rx2[z], rx2[zz]-rx2[z], s1, s2);
                    ry1[npoints] = addscaleclamp(ry2[z], ry2[zz]-ry2[z], s1, s2);
                    if (s1 < 0) p2[splitcnt++] = npoints;
                    xb1[npoints] = npoints+1;
                    npoints++;
                }
                z = zz;
            }
            while (xb2[z] >= 0);

            if (npoints >= start2+3)
                xb1[npoints-1] = start2, start2 = npoints;
            else
                npoints = start2;

            z = 1;
            while ((z < npoints2) && (xb2[z] < 0)) z++;
        }
        while (z < npoints2);
        if (npoints <= 2) return(0);

        for (z=1; z<splitcnt; z++)
            for (zz=0; zz<z; zz++)
            {
                z1 = p2[z]; z2 = xb1[z1]; z3 = p2[zz]; z4 = xb1[z3];
                s1  = klabs(rx1[z1]-rx1[z2])+klabs(ry1[z1]-ry1[z2]);
                s1 += klabs(rx1[z3]-rx1[z4])+klabs(ry1[z3]-ry1[z4]);
                s2  = klabs(rx1[z1]-rx1[z4])+klabs(ry1[z1]-ry1[z4]);
                s2 += klabs(rx1[z3]-rx1[z2])+klabs(ry1[z3]-ry1[z2]);
                if (s2 < s1)
                    { t = xb1[p2[z]]; xb1[p2[z]] = xb1[p2[zz]]; xb1[p2[zz]] = t; }
            }
    }
    return(npoints);
}


//
// clippoly4 (internal)
//
//Assume npoints=4 with polygon on &nrx1,&nry1
//JBF 20031206: Thanks to Ken's hunting, s/(rx1|ry1|rx2|ry2)/n\1/ in this function
static int32_t clippoly4(int32_t cx1, int32_t cy1, int32_t cx2, int32_t cy2)
{
    int32_t n, nn, z, zz, x, x1, x2, y, y1, y2, t;

    nn = 0; z = 0;
    do
    {
        zz = ((z+1)&3);
        x1 = nrx1[z]; x2 = nrx1[zz]-x1;

        if ((cx1 <= x1) && (x1 <= cx2))
            nrx2[nn] = x1, nry2[nn] = nry1[z], nn++;

        if (x2 <= 0) x = cx2; else x = cx1;
        t = x-x1;
        if (((t-x2)^t) < 0)
            nrx2[nn] = x, nry2[nn] = nry1[z]+scale(t,nry1[zz]-nry1[z],x2), nn++;

        if (x2 <= 0) x = cx1; else x = cx2;
        t = x-x1;
        if (((t-x2)^t) < 0)
            nrx2[nn] = x, nry2[nn] = nry1[z]+scale(t,nry1[zz]-nry1[z],x2), nn++;

        z = zz;
    }
    while (z != 0);
    if (nn < 3) return(0);

    n = 0; z = 0;
    do
    {
        zz = z+1; if (zz == nn) zz = 0;
        y1 = nry2[z]; y2 = nry2[zz]-y1;

        if ((cy1 <= y1) && (y1 <= cy2))
            nry1[n] = y1, nrx1[n] = nrx2[z], n++;

        if (y2 <= 0) y = cy2; else y = cy1;
        t = y-y1;
        if (((t-y2)^t) < 0)
            nry1[n] = y, nrx1[n] = nrx2[z]+scale(t,nrx2[zz]-nrx2[z],y2), n++;

        if (y2 <= 0) y = cy1; else y = cy2;
        t = y-y1;
        if (((t-y2)^t) < 0)
            nry1[n] = y, nrx1[n] = nrx2[z]+scale(t,nrx2[zz]-nrx2[z],y2), n++;

        z = zz;
    }
    while (z != 0);
    return(n);
}


// INTERNAL helper function for classic/polymost dorotatesprite
//  sxptr, sxptr, z: in/out
//  ret_yxaspect, ret_xyaspect: out
void dorotspr_handle_bit2(int32_t *sxptr, int32_t *syptr, int32_t *z, int32_t dastat,
                          int32_t cx1_plus_cx2, int32_t cy1_plus_cy2,
                          int32_t *ret_yxaspect, int32_t *ret_xyaspect)
{
    if ((dastat&2) == 0)
    {
        if (!(dastat & 1024) && 4*ydim <= 3*xdim)
        {
            *ret_yxaspect = (12<<16)/10;
            *ret_xyaspect = (10<<16)/12;
        }
        else
        {
            *ret_yxaspect = yxaspect;
            *ret_xyaspect = xyaspect;
        }

        // *sxptr and *syptr and *z are left unchanged

        return;
    }
    else
    {
        // dastat&2: Auto window size scaling
        const int32_t oxdim = xdim;
        int32_t xdim = oxdim;  // SHADOWS global

        int32_t zoomsc, sx=*sxptr, sy=*syptr;
        int32_t ouryxaspect = yxaspect, ourxyaspect = xyaspect;

        // screen center to s[xy], 320<<16 coords.
        const int32_t normxofs = sx-(320<<15), normyofs = sy-(200<<15);

        if (!(dastat & 1024) && 4*ydim <= 3*xdim)
        {
            xdim = (4*ydim)/3;

            ouryxaspect = (12<<16)/10;
            ourxyaspect = (10<<16)/12;
        }

        // nasty hacks go here
        if (!(dastat&8))
        {
            const int32_t twice_midcx = cx1_plus_cx2+2;

            // screen x center to sx1, scaled to viewport
            const int32_t scaledxofs = scale(normxofs, scale(xdimen, xdim, oxdim), 320);

            int32_t xbord = 0;

            if (dastat & (256|512))
            {
                xbord = scale(oxdim-xdim, twice_midcx, oxdim);

                if ((dastat & 512)==0)
                    xbord = -xbord;
            }

            sx = ((twice_midcx+xbord)<<15) + scaledxofs;

            zoomsc = xdimenscale;   //= scale(xdimen,yxaspect,320);
            sy = ((cy1_plus_cy2+2)<<15) + mulscale16(normyofs, zoomsc);
        }
        else
        {
            //If not clipping to startmosts, & auto-scaling on, as a
            //hard-coded bonus, scale to full screen instead

            sx = (xdim<<15)+32768 + scale(normxofs,xdim,320);

            if (dastat & 512)
                sx += (oxdim-xdim)<<16;
            else if ((dastat & 256) == 0)
                sx += (oxdim-xdim)<<15;

            if (dastat&RS_CENTERORIGIN)
                sx += oxdim<<15;

            zoomsc = scale(xdim, ouryxaspect, 320);
            sy = (ydim<<15)+32768 + mulscale16(normyofs, zoomsc);
        }

        *sxptr = sx;
        *syptr = sy;
        *z = mulscale16(*z, zoomsc);

        *ret_yxaspect = ouryxaspect;
        *ret_xyaspect = ourxyaspect;
    }
}


//
// dorotatesprite (internal)
//
//JBF 20031206: Thanks to Ken's hunting, s/(rx1|ry1|rx2|ry2)/n\1/ in this function
static void dorotatesprite(int32_t sx, int32_t sy, int32_t z, int16_t a, int16_t picnum,
                           int8_t dashade, char dapalnum, int32_t dastat, uint8_t daalpha,
                           int32_t cx1, int32_t cy1, int32_t cx2, int32_t cy2,
                           int32_t uniqid)
{
    // NOTE: if these are made unsigned (for safety), angled tiles may draw
    // incorrectly, showing vertical seams at intervals.
    int32_t bx, by;

    int32_t cosang, sinang, v, nextv, dax1, dax2, oy;
    int32_t i, x, y, x1, y1, x2, y2, gx1, gy1;
    intptr_t p, bufplc, palookupoffs;
    int32_t xsiz, ysiz, xoff, yoff, npoints, yplc, yinc, lx, rx;
    int32_t xv, yv, xv2, yv2;

    int32_t ouryxaspect, ourxyaspect;

    UNREFERENCED_PARAMETER(uniqid);

    if (g_rotatespriteNoWidescreen)
    {
        dastat |= 1024;
        dastat &= ~(512+256);
    }

    //============================================================================= //POLYMOST BEGINS
#ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST && in3dmode())
    {
        polymost_dorotatesprite(sx,sy,z,a,picnum,dashade,dapalnum,dastat,daalpha,cx1,cy1,cx2,cy2,uniqid);
        return;
    }
#endif
    //============================================================================= //POLYMOST ENDS

    // bound clipping rectangle to screen
    if (cx1 < 0) cx1 = 0;
    if (cy1 < 0) cy1 = 0;
    if (cx2 > xres-1) cx2 = xres-1;
    if (cy2 > yres-1) cy2 = yres-1;

    xsiz = tilesizx[picnum];
    ysiz = tilesizy[picnum];

    if (dastat&16)
    {
        // Bit 1<<4 set: origin is top left corner?
        xoff = 0;
        yoff = 0;
    }
    else
    {
        // Bit 1<<4 clear: origin is center of tile, and per-tile offset is applied.
        // TODO: split the two?
        xoff = picanm[picnum].xofs + (xsiz>>1);
        yoff = picanm[picnum].yofs + (ysiz>>1);
    }

    // Bit 1<<2: invert y
    if (dastat&4)
        yoff = ysiz-yoff;

    cosang = sintable[(a+512)&2047];
    sinang = sintable[a&2047];

    dorotspr_handle_bit2(&sx, &sy, &z, dastat, cx1+cx2, cy1+cy2, &ouryxaspect, &ourxyaspect);

    xv = mulscale14(cosang,z);
    yv = mulscale14(sinang,z);
    if ((dastat&2) || (dastat&8) == 0) //Don't aspect unscaled perms
    {
        xv2 = mulscale16(xv,ourxyaspect);
        yv2 = mulscale16(yv,ourxyaspect);
    }
    else
    {
        xv2 = xv;
        yv2 = yv;
    }

    nry1[0] = sy - (yv*xoff + xv*yoff);
    nry1[1] = nry1[0] + yv*xsiz;
    nry1[3] = nry1[0] + xv*ysiz;
    nry1[2] = nry1[1]+nry1[3]-nry1[0];
    i = (cy1<<16); if ((nry1[0]<i) && (nry1[1]<i) && (nry1[2]<i) && (nry1[3]<i)) return;
    i = (cy2<<16); if ((nry1[0]>i) && (nry1[1]>i) && (nry1[2]>i) && (nry1[3]>i)) return;

    nrx1[0] = sx - (xv2*xoff - yv2*yoff);
    nrx1[1] = nrx1[0] + xv2*xsiz;
    nrx1[3] = nrx1[0] - yv2*ysiz;
    nrx1[2] = nrx1[1]+nrx1[3]-nrx1[0];
    i = (cx1<<16); if ((nrx1[0]<i) && (nrx1[1]<i) && (nrx1[2]<i) && (nrx1[3]<i)) return;
    i = (cx2<<16); if ((nrx1[0]>i) && (nrx1[1]>i) && (nrx1[2]>i) && (nrx1[3]>i)) return;

    gx1 = nrx1[0]; gy1 = nry1[0];   //back up these before clipping

    npoints = clippoly4(cx1<<16,cy1<<16,(cx2+1)<<16,(cy2+1)<<16);
    if (npoints < 3) return;

    lx = nrx1[0]; rx = nrx1[0];

    nextv = 0;
    for (v=npoints-1; v>=0; v--)
    {
        x1 = nrx1[v]; x2 = nrx1[nextv];
        dax1 = (x1>>16); if (x1 < lx) lx = x1;
        dax2 = (x2>>16); if (x1 > rx) rx = x1;
        if (dax1 != dax2)
        {
            y1 = nry1[v]; y2 = nry1[nextv];
            yinc = divscale16(y2-y1,x2-x1);
            if (dax2 > dax1)
            {
                yplc = y1 + mulscale16((dax1<<16)+65535-x1,yinc);
                // Assertion fails with DNF mod: in mapster32,
                // set dt_t 3864  (bike HUD, 700x220)
                // set dt_a 100
                // set dt_z 1280000  <- CRASH!
                Bassert((unsigned)dax1 < MAXXDIM && (unsigned)dax2 < MAXXDIM+1);
                qinterpolatedown16short((intptr_t)&uplc[dax1], dax2-dax1, yplc, yinc);
            }
            else
            {
                yplc = y2 + mulscale16((dax2<<16)+65535-x2,yinc);
                Bassert((unsigned)dax2 < MAXXDIM && (unsigned)dax1 < MAXXDIM+1);
                qinterpolatedown16short((intptr_t)&dplc[dax2], dax1-dax2, yplc, yinc);
            }
        }
        nextv = v;
    }

    if (waloff[picnum] == 0) loadtile(picnum);
    setgotpic(picnum);
    bufplc = waloff[picnum];

    if (palookup[dapalnum] == NULL) dapalnum = 0;
    palookupoffs = FP_OFF(palookup[dapalnum]) + (getpalookup(0, dashade)<<8);

    // hack pending proper alpha implentation
    // TODO: a real implementation
    if (daalpha > 84) // if alpha is 0 (which is the default) this structure should only necessitate one comparison
    {
        if ((dastat&1) && daalpha > 127) // this covers the multiplicative aspect used in the Polymodes
            dastat |= 32;

        dastat |= 1;

        if (daalpha > 168)
        {
            dastat |= 32;

            if (daalpha == 255)
                return;
        }
    }

    i = divscale32(1L,z);
    xv = mulscale14(sinang,i);
    yv = mulscale14(cosang,i);
    if ((dastat&2) || (dastat&8)==0) //Don't aspect unscaled perms
    {
        yv2 = mulscale16(-xv,ouryxaspect);
        xv2 = mulscale16(yv,ouryxaspect);
    }
    else
    {
        yv2 = -xv;
        xv2 = yv;
    }

    x1 = (lx>>16);
    x2 = (rx>>16);

    oy = 0;
    x = (x1<<16)-1-gx1;
    y = (oy<<16)+65535-gy1;
    bx = dmulscale16(x,xv2,y,xv);
    by = dmulscale16(x,yv2,y,yv);

    if (dastat&4)
    {
        yv = -yv;
        yv2 = -yv2;
        by = (ysiz<<16)-1-by;
    }

#if defined ENGINE_USING_A_C
    if ((dastat&1)==0 && ((a&1023) == 0) && (ysiz <= 256))  //vlineasm4 has 256 high limit!
#else
    if ((dastat&1) == 0)
#endif
    {
        int32_t y1ve[4], y2ve[4], u4, d4;

        if (((a&1023) == 0) && (ysiz <= 256))  //vlineasm4 has 256 high limit!
        {
            if (dastat&64)
                setupvlineasm(24L);
            else
                setupmvlineasm(24L, 0);

            by <<= 8; yv <<= 8; yv2 <<= 8;

            palookupoffse[0] = palookupoffse[1] = palookupoffse[2] = palookupoffse[3] = palookupoffs;
            vince[0] = vince[1] = vince[2] = vince[3] = yv;

            for (x=x1; x<x2; x+=4)
            {
                char bad;
                int32_t xx, xend;

                bad = 15; xend = min(x2-x,4);
                for (xx=0; xx<xend; xx++)
                {
                    bx += xv2;

                    y1 = uplc[x+xx]; y2 = dplc[x+xx];
                    if ((dastat&8) == 0)
                    {
                        if (startumost[x+xx] > y1) y1 = startumost[x+xx];
                        if (startdmost[x+xx] < y2) y2 = startdmost[x+xx];
                    }
                    if (y2 <= y1) continue;

                    by += (uint32_t)yv*(y1-oy); oy = y1;

                    // Assertion would fail with DNF mod without (uint32_t) below: in mapster32,
                    // set dt_t 3864  (bike HUD, 700x220)
                    // set dt_z 16777216
                    // <Increase yxaspect by pressing [9]>  <-- CRASH!
                    // (It also fails when wrecking the bike in-game by driving into a wall.)
//                    Bassert(bx >= 0);

                    bufplce[xx] = ((uint32_t)bx>>16)*ysiz+bufplc;
                    vplce[xx] = by;
                    y1ve[xx] = y1;
                    y2ve[xx] = y2-1;
                    bad &= ~pow2char[xx];
                }

                p = x+frameplace;

                u4 = INT32_MIN;
                d4 = INT32_MAX;
                for (xx=0; xx<4; xx++)
                    if (!(bad&pow2char[xx]))
                    {
                        u4 = max(u4, y1ve[xx]);
                        d4 = min(d4, y2ve[xx]);
                    }
                // This version may access uninitialized y?ve[] values with
                // thin tiles, e.g. 3085 (MINIFONT period, 1x5):
//                u4 = max(max(y1ve[0],y1ve[1]),max(y1ve[2],y1ve[3]));
//                d4 = min(min(y2ve[0],y2ve[1]),min(y2ve[2],y2ve[3]));

                if (dastat&64)
                {
                    if ((bad != 0) || (u4 >= d4))
                    {
                        if (!(bad&1)) prevlineasm1(vince[0],palookupoffse[0],y2ve[0]-y1ve[0],vplce[0],bufplce[0],ylookup[y1ve[0]]+p+0);
                        if (!(bad&2)) prevlineasm1(vince[1],palookupoffse[1],y2ve[1]-y1ve[1],vplce[1],bufplce[1],ylookup[y1ve[1]]+p+1);
                        if (!(bad&4)) prevlineasm1(vince[2],palookupoffse[2],y2ve[2]-y1ve[2],vplce[2],bufplce[2],ylookup[y1ve[2]]+p+2);
                        if (!(bad&8)) prevlineasm1(vince[3],palookupoffse[3],y2ve[3]-y1ve[3],vplce[3],bufplce[3],ylookup[y1ve[3]]+p+3);
                        continue;
                    }

                    if (u4 > y1ve[0]) vplce[0] = prevlineasm1(vince[0],palookupoffse[0],u4-y1ve[0]-1,vplce[0],bufplce[0],ylookup[y1ve[0]]+p+0);
                    if (u4 > y1ve[1]) vplce[1] = prevlineasm1(vince[1],palookupoffse[1],u4-y1ve[1]-1,vplce[1],bufplce[1],ylookup[y1ve[1]]+p+1);
                    if (u4 > y1ve[2]) vplce[2] = prevlineasm1(vince[2],palookupoffse[2],u4-y1ve[2]-1,vplce[2],bufplce[2],ylookup[y1ve[2]]+p+2);
                    if (u4 > y1ve[3]) vplce[3] = prevlineasm1(vince[3],palookupoffse[3],u4-y1ve[3]-1,vplce[3],bufplce[3],ylookup[y1ve[3]]+p+3);

                    if (d4 >= u4) vlineasm4(d4-u4+1, (char *)(ylookup[u4]+p));

                    i = p+ylookup[d4+1];
                    if (y2ve[0] > d4) prevlineasm1(vince[0],palookupoffse[0],y2ve[0]-d4-1,vplce[0],bufplce[0],i+0);
                    if (y2ve[1] > d4) prevlineasm1(vince[1],palookupoffse[1],y2ve[1]-d4-1,vplce[1],bufplce[1],i+1);
                    if (y2ve[2] > d4) prevlineasm1(vince[2],palookupoffse[2],y2ve[2]-d4-1,vplce[2],bufplce[2],i+2);
                    if (y2ve[3] > d4) prevlineasm1(vince[3],palookupoffse[3],y2ve[3]-d4-1,vplce[3],bufplce[3],i+3);
                }
                else
                {
                    if ((bad != 0) || (u4 >= d4))
                    {
                        if (!(bad&1)) mvlineasm1(vince[0],palookupoffse[0],y2ve[0]-y1ve[0],vplce[0],bufplce[0],ylookup[y1ve[0]]+p+0);
                        if (!(bad&2)) mvlineasm1(vince[1],palookupoffse[1],y2ve[1]-y1ve[1],vplce[1],bufplce[1],ylookup[y1ve[1]]+p+1);
                        if (!(bad&4)) mvlineasm1(vince[2],palookupoffse[2],y2ve[2]-y1ve[2],vplce[2],bufplce[2],ylookup[y1ve[2]]+p+2);
                        if (!(bad&8)) mvlineasm1(vince[3],palookupoffse[3],y2ve[3]-y1ve[3],vplce[3],bufplce[3],ylookup[y1ve[3]]+p+3);
                        continue;
                    }

                    if (u4 > y1ve[0]) vplce[0] = mvlineasm1(vince[0],palookupoffse[0],u4-y1ve[0]-1,vplce[0],bufplce[0],ylookup[y1ve[0]]+p+0);
                    if (u4 > y1ve[1]) vplce[1] = mvlineasm1(vince[1],palookupoffse[1],u4-y1ve[1]-1,vplce[1],bufplce[1],ylookup[y1ve[1]]+p+1);
                    if (u4 > y1ve[2]) vplce[2] = mvlineasm1(vince[2],palookupoffse[2],u4-y1ve[2]-1,vplce[2],bufplce[2],ylookup[y1ve[2]]+p+2);
                    if (u4 > y1ve[3]) vplce[3] = mvlineasm1(vince[3],palookupoffse[3],u4-y1ve[3]-1,vplce[3],bufplce[3],ylookup[y1ve[3]]+p+3);

                    if (d4 >= u4) mvlineasm4(d4-u4+1, (char *)(ylookup[u4]+p));

                    i = p+ylookup[d4+1];
                    if (y2ve[0] > d4) mvlineasm1(vince[0],palookupoffse[0],y2ve[0]-d4-1,vplce[0],bufplce[0],i+0);
                    if (y2ve[1] > d4) mvlineasm1(vince[1],palookupoffse[1],y2ve[1]-d4-1,vplce[1],bufplce[1],i+1);
                    if (y2ve[2] > d4) mvlineasm1(vince[2],palookupoffse[2],y2ve[2]-d4-1,vplce[2],bufplce[2],i+2);
                    if (y2ve[3] > d4) mvlineasm1(vince[3],palookupoffse[3],y2ve[3]-d4-1,vplce[3],bufplce[3],i+3);
                }

                faketimerhandler();
            }
        }
#ifndef ENGINE_USING_A_C
        else
        {
            int32_t ny1, ny2;
            int32_t qlinemode = 0;

            if (dastat&64)
            {
                if ((xv2&0x0000ffff) == 0)
                {
                    qlinemode = 1;
                    setupqrhlineasm4(0L,yv2<<16,(xv2>>16)*ysiz+(yv2>>16),palookupoffs,0L,0L);
                }
                else
                {
                    qlinemode = 0;
                    setuprhlineasm4(xv2<<16,yv2<<16,(xv2>>16)*ysiz+(yv2>>16),palookupoffs,ysiz,0L);
                }
            }
            else
                setuprmhlineasm4(xv2<<16,yv2<<16,(xv2>>16)*ysiz+(yv2>>16),palookupoffs,ysiz,0L);

            y1 = uplc[x1];
            if (((dastat&8) == 0) && (startumost[x1] > y1)) y1 = startumost[x1];
            y2 = y1;
            for (x=x1; x<x2; x++)
            {
                ny1 = uplc[x]-1; ny2 = dplc[x];
                if ((dastat&8) == 0)
                {
                    if (startumost[x]-1 > ny1) ny1 = startumost[x]-1;
                    if (startdmost[x] < ny2) ny2 = startdmost[x];
                }

                if (ny1 < ny2-1)
                {
                    if (ny1 >= y2)
                    {
                        while (y1 < y2-1)
                        {
                            y1++; if ((y1&31) == 0) faketimerhandler();

                            //x,y1
                            bx += xv*(y1-oy); by += yv*(y1-oy); oy = y1;
                            if (dastat&64)
                            {
                                if (qlinemode) qrhlineasm4(x-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,0L    ,by<<16,ylookup[y1]+x+frameplace);
                                else rhlineasm4(x-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,bx<<16,by<<16,ylookup[y1]+x+frameplace);
                            }
                            else rmhlineasm4(x-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,bx<<16,by<<16,ylookup[y1]+x+frameplace);
                        }
                        y1 = ny1;
                    }
                    else
                    {
                        while (y1 < ny1)
                        {
                            y1++; if ((y1&31) == 0) faketimerhandler();

                            //x,y1
                            bx += xv*(y1-oy); by += yv*(y1-oy); oy = y1;
                            if (dastat&64)
                            {
                                if (qlinemode) qrhlineasm4(x-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,0L    ,by<<16,ylookup[y1]+x+frameplace);
                                else rhlineasm4(x-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,bx<<16,by<<16,ylookup[y1]+x+frameplace);
                            }
                            else rmhlineasm4(x-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,bx<<16,by<<16,ylookup[y1]+x+frameplace);
                        }

                        while (y1 > ny1) lastx[y1--] = x;
                    }

                    while (y2 > ny2)
                    {
                        y2--; if ((y2&31) == 0) faketimerhandler();

                        //x,y2
                        bx += xv*(y2-oy); by += yv*(y2-oy); oy = y2;
                        if (dastat&64)
                        {
                            if (qlinemode) qrhlineasm4(x-lastx[y2],(bx>>16)*ysiz+(by>>16)+bufplc,0L,0L    ,by<<16,ylookup[y2]+x+frameplace);
                            else rhlineasm4(x-lastx[y2],(bx>>16)*ysiz+(by>>16)+bufplc,0L,bx<<16,by<<16,ylookup[y2]+x+frameplace);
                        }
                        else rmhlineasm4(x-lastx[y2],(bx>>16)*ysiz+(by>>16)+bufplc,0L,bx<<16,by<<16,ylookup[y2]+x+frameplace);
                    }

                    while (y2 < ny2) lastx[y2++] = x;
                }
                else
                {
                    while (y1 < y2-1)
                    {
                        y1++; if ((y1&31) == 0) faketimerhandler();

                        //x,y1
                        bx += xv*(y1-oy); by += yv*(y1-oy); oy = y1;
                        if (dastat&64)
                        {
                            if (qlinemode) qrhlineasm4(x-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,0L    ,by<<16,ylookup[y1]+x+frameplace);
                            else rhlineasm4(x-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,bx<<16,by<<16,ylookup[y1]+x+frameplace);
                        }
                        else rmhlineasm4(x-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,bx<<16,by<<16,ylookup[y1]+x+frameplace);
                    }

                    if (x == x2-1) { bx += xv2; by += yv2; break; }
                    y1 = uplc[x+1];
                    if (((dastat&8) == 0) && (startumost[x+1] > y1)) y1 = startumost[x+1];
                    y2 = y1;
                }
                bx += xv2; by += yv2;
            }

            while (y1 < y2-1)
            {
                y1++; if ((y1&31) == 0) faketimerhandler();

                //x2,y1
                bx += xv*(y1-oy); by += yv*(y1-oy); oy = y1;
                if (dastat&64)
                {
                    if (qlinemode) qrhlineasm4(x2-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,0L,by<<16,ylookup[y1]+x2+frameplace);
                    else rhlineasm4(x2-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,bx<<16,by<<16,ylookup[y1]+x2+frameplace);
                }
                else rmhlineasm4(x2-lastx[y1],(bx>>16)*ysiz+(by>>16)+bufplc,0L,bx<<16,by<<16,ylookup[y1]+x2+frameplace);
            }
        }
#endif  // !defined ENGINE_USING_A_C
    }
    else
    {
        if ((dastat&1) == 0)
        {
#if !defined ENGINE_USING_A_C
            if (dastat&64)
                setupspritevline(palookupoffs,(xv>>16)*ysiz,xv<<16,ysiz,yv,0L);
            else
                msetupspritevline(palookupoffs,(xv>>16)*ysiz,xv<<16,ysiz,yv,0L);
#else
            if (dastat&64)
                setupspritevline(palookupoffs,xv,yv,ysiz);
            else
                msetupspritevline(palookupoffs,xv,yv,ysiz);
#endif
        }
        else
        {
#if !defined ENGINE_USING_A_C
            tsetupspritevline(palookupoffs,(xv>>16)*ysiz,xv<<16,ysiz,yv,0L);
#else
            tsetupspritevline(palookupoffs,xv,yv,ysiz);
#endif
            if (dastat&32) settransreverse(); else settransnormal();
        }

        for (x=x1; x<x2; x++)
        {
            bx += xv2; by += yv2;

            y1 = uplc[x]; y2 = dplc[x];
            if ((dastat&8) == 0)
            {
                if (startumost[x] > y1) y1 = startumost[x];
                if (startdmost[x] < y2) y2 = startdmost[x];
            }
            if (y2 <= y1) continue;

            switch (y1-oy)
            {
            case -1:
                bx -= xv; by -= yv; oy = y1; break;
            case 0:
                break;
            case 1:
                bx += xv; by += yv; oy = y1; break;
            default:
                bx += xv*(y1-oy); by += yv*(y1-oy); oy = y1; break;
            }

            p = ylookup[y1]+x+frameplace;

            if ((dastat&1) == 0)
            {
#if !defined ENGINE_USING_A_C
                if (dastat&64)
                    spritevline(0L,by<<16,y2-y1+1,bx<<16,(bx>>16)*ysiz+(by>>16)+bufplc,p);
                else
                    mspritevline(0L,by<<16,y2-y1+1,bx<<16,(bx>>16)*ysiz+(by>>16)+bufplc,p);
#else
                if (dastat&64)
                    spritevline(bx&65535,by&65535,y2-y1+1,(bx>>16)*ysiz+(by>>16)+bufplc,p);
                else
                    mspritevline(bx&65535,by&65535,y2-y1+1,(bx>>16)*ysiz+(by>>16)+bufplc,p);
#endif
            }
            else
            {
#if !defined ENGINE_USING_A_C
                tspritevline(0L,by<<16,y2-y1+1,bx<<16,(bx>>16)*ysiz+(by>>16)+bufplc,p);
#else
                tspritevline(bx&65535,by&65535,y2-y1+1,(bx>>16)*ysiz+(by>>16)+bufplc,p);
                //transarea += (y2-y1);
#endif
            }

            faketimerhandler();
        }
    }

    /*  if ((dastat&128) && (origbuffermode == 0))
        {
            buffermode = obuffermode;
            setactivepage(activepage);
        }*/
}


//
// initksqrt (internal)
//
static inline void initksqrt(void)
{
    int32_t i, j, k;

    j = 1; k = 0;
    for (i=0; i<4096; i++)
    {
        if (i >= j) { j <<= 2; k++; }
        sqrtable[i] = (uint16_t)(msqrtasm((i<<18)+131072)<<1);
        shlookup[i] = (k<<1)+((10-k)<<8);
        if (i < 256) shlookup[i+4096] = ((k+6)<<1)+((10-(k+6))<<8);
    }
}


//
// dosetaspect
//
static void dosetaspect(void)
{
    int32_t i, j;

    if (xyaspect != oxyaspect)
    {
        oxyaspect = xyaspect;
        j = xyaspect*320;
        horizlookup2[horizycent-1] = divscale26(131072,j);
        for (i=ydim*4-1; i>=0; i--)
            if (i != (horizycent-1))
            {
                horizlookup[i] = divscale28(1,i-(horizycent-1));
                horizlookup2[i] = divscale14(klabs(horizlookup[i]),j);
            }
    }

    if (xdimen != oxdimen || viewingrange != oviewingrange)
    {
        int32_t k, x, xinc;

        no_radarang2 = 0;
        oxdimen = xdimen;
        oviewingrange = viewingrange;

        xinc = mulscale32(viewingrange*320,xdimenrecip);
        x = (640<<16)-mulscale1(xinc,xdimen);

        for (i=0; i<xdimen; i++)
        {
            j = (x&65535); k = (x>>16); x += xinc;

            if (k < 0 || k >= (int32_t)(sizeof(radarang)/sizeof(radarang[0]))-1)
            {
                no_radarang2 = 1;
#ifdef DEBUGGINGAIDS
                if (editstatus)
                    initprintf("no rad2\n");
#endif
                break;
            }

            if (j != 0)
                j = mulscale16(radarang[k+1]-radarang[k], j);
            radarang2[i] = (int16_t)((radarang[k]+j)>>6);
        }

        for (i=1; i<(int32_t)(sizeof(distrecip)/sizeof(distrecip[0])); i++)
            distrecip[i] = divscale20(xdimen,i);

        nytooclose = xdimen*2100;
        nytoofar = 65536*16384-1048576;
    }
}


//
// loadtables (internal)
//
static inline void calcbritable(void)
{
    int32_t i,j;
    double a,b;
    for (i=0; i<16; i++)
    {
        a = (double)8 / ((double)i+8);
        b = (double)255 / pow((double)255,a);
        for (j=0; j<256; j++) // JBF 20040207: full 8bit precision
            britable[i][j] = (uint8_t)(pow((double)j,a)*b);
    }
}

#define BANG2RAD (PI/1024.0)

static int32_t loadtables(void)
{
    static char tablesloaded = 0;

    if (tablesloaded == 0)
    {
        int32_t i;

        initksqrt();

        for (i=0; i<2048; i++)
            reciptable[i] = divscale30(2048, i+2048);

        for (i=0; i<=512; i++)
            sintable[i] = (int16_t)(16384*sin(i*BANG2RAD));
        for (i=513; i<1024; i++)
            sintable[i] = sintable[1024-i];
        for (i=1024; i<2048; i++)
            sintable[i] = -sintable[i-1024];

        for (i=0; i<640; i++)
            radarang[i] = (int16_t)(-64*atan((640-0.5-i)/160)/BANG2RAD);
        for (i=0; i<640; i++)
            radarang[1279-i] = -radarang[i];

#ifdef B_LITTLE_ENDIAN
        i = 0;
        if (crc32once((uint8_t *)sintable, sizeof(sintable)) != 0xee1e7aba)
            i |= 1;
        if (crc32once((uint8_t *)radarang, 640*sizeof(radarang[0])) != 0xee893d92)
            i |= 2;

        if (i != 0)
        {
            static const char *str[3] = { "sine table", "arctangent table",
                                          "sine and arctangent tables" };
            initprintf("WARNING: Calculated %s differ%s from original!\n",
                       str[i-1], i==3 ? "" : "s");
        }
#endif
        // TABLES.DAT format:
        //kread(fil,sintable,2048*2);
        //kread(fil,radarang,640*2);
        //kread(fil,textfont,1024);
        //kread(fil,smalltextfont,1024);
        //kread(fil,britable,1024);

        calcbritable();

        tablesloaded = 1;
    }

    return 0;
}


//
// initfastcolorlookup (internal)
//
static void initfastcolorlookup(int32_t rscale, int32_t gscale, int32_t bscale)
{
    int32_t i, j, x, y, z;
    const char *pal1;

    j = 0;
    for (i=64; i>=0; i--)
    {
        //j = (i-64)*(i-64);
        rdist[i] = rdist[128-i] = j*rscale;
        gdist[i] = gdist[128-i] = j*gscale;
        bdist[i] = bdist[128-i] = j*bscale;
        j += 129-(i<<1);
    }

    Bmemset(colhere,0,sizeof(colhere));
    Bmemset(colhead,0,sizeof(colhead));

    pal1 = (char *)&palette[768-3];
    for (i=255; i>=0; i--,pal1-=3)
    {
        j = (pal1[0]>>3)*FASTPALGRIDSIZ*FASTPALGRIDSIZ
            + (pal1[1]>>3)*FASTPALGRIDSIZ + (pal1[2]>>3)
            + FASTPALGRIDSIZ*FASTPALGRIDSIZ + FASTPALGRIDSIZ+1;
        if (colhere[j>>3]&pow2char[j&7]) colnext[i] = colhead[j]; else colnext[i] = -1;
        colhead[j] = i;
        colhere[j>>3] |= pow2char[j&7];
    }

    i = 0;
    for (x=-FASTPALGRIDSIZ*FASTPALGRIDSIZ; x<=FASTPALGRIDSIZ*FASTPALGRIDSIZ; x+=FASTPALGRIDSIZ*FASTPALGRIDSIZ)
        for (y=-FASTPALGRIDSIZ; y<=FASTPALGRIDSIZ; y+=FASTPALGRIDSIZ)
            for (z=-1; z<=1; z++)
                colscan[i++] = x+y+z;
    i = colscan[13]; colscan[13] = colscan[26]; colscan[26] = i;
}


static void alloc_palookup(int32_t pal)
{
#if defined ENGINE_USING_A_C || (defined CLASSIC_NONPOW2_YSIZE_WALLS && defined CLASSIC_NONPOW2_YSIZE_SPRITES)
    palookup[pal] = (char *)Bmalloc(numshades*256);
#else
    // The asm functions vlineasm1, mvlineasm1 (maybe others?) access the next
    // palookup[...] shade entry for tilesizy==512 tiles.
    // See DEBUG_TILESIZY_512 and the comment in a.nasm: vlineasm1.
    palookup[pal] = (char *)Bcalloc(numshades+1, 256);
#endif
}

static int32_t loadpalette_err(const char *msg)
{
    engineerrstr = msg;
    initprintf("ERROR: %s\n", engineerrstr);
    return -1;
}

//
// loadpalette (internal)
//
static int32_t loadpalette(void)
{
    int32_t fil, lamedukep=0;

    if (paletteloaded != 0) return 0;
    if ((fil = kopen4load("palette.dat",0)) == -1)
        return loadpalette_err("Failed to load \"palette.dat\"!");

    kread(fil,palette,768);
    kread(fil,&numshades,2); numshades = B_LITTLE16(numshades);

    if (numshades <= 0)
        return loadpalette_err("Invalid number of shades in \"palette.dat\"!");

    alloc_palookup(0);

    transluc = (char *)Bcalloc(256, 256);
    if (palookup[0] == NULL || transluc == NULL)
        return loadpalette_err("Out of memory in loadpalette()!");

    globalpalwritten = palookup[0]; globalpal = 0;
    setpalookupaddress(globalpalwritten);

    fixtransluscence(FP_OFF(transluc));

    // Auto-detect LameDuke. Its PALETTE.DAT doesn't have a 'numshades' 16-bit
    // int after the base palette, but starts directly with the shade tables.
    // Thus, the first two bytes will be 00 01, which is 256 if read as
    // little-endian int16_t.
    if (numshades ==  256)
    {
        if (klseek(fil, -2, BSEEK_CUR) < 0)
            return loadpalette_err("klseek() failed in loadpalette()!");

        numshades = 32;
        lamedukep = 1;
    }

    // Read base shade table (palookup 0).
    kread(fil, palookup[globalpal], numshades<<8);

    // Read translucency (blending) table.
    if (lamedukep)
    {
        int32_t i, j;

        for (i=0; i<256; i++)
        {
            // LameDuke's table doesn't have the last row or column.
            if (i == 255)
                continue;

            // Read the entries above and on the diagonal, if the table is
            // thought as being row-major.
            if (kread(fil, &transluc[256*i + i], 256-i-1) < 0)
                return loadpalette_err("Failed reading LameDuke translucency table!");

            // Duplicate the entries below the diagonal.
            for (j=0; j<i; j++)
                transluc[256*i + j] = transluc[256*j + i];
        }
    }
    else
    {
        if (kread(fil, transluc, 65536) < 0)
            return loadpalette_err("Failed reading translucency table!");
    }

    kclose(fil);

#ifdef DEBUG_TILESIZY_512
    {
        int32_t i;
        // Bump shade 1 by 16.
        for (i=256; i<512; i++)
            palookup[0][i] = palookup[0][i+(16<<8)];
    }
#endif

    // If Duke3D 1.5 GRP or LameDuke, ...
    if (crc32once((uint8_t *)transluc, 65536)==0x94a1fac6 || lamedukep)
    {
        int32_t i;
        // ... fix up translucency table so that transluc(255,x)
        // and transluc(x,255) is black instead of purple.
        for (i=0; i<256; i++)
        {
            transluc[(255<<8) + i] = transluc[i];
            transluc[255 + (i<<8)] = transluc[i<<8];
        }
    }

    initfastcolorlookup(30, 59, 11);

    {
        int32_t i, j, k = 0;
        for (i=0; i<256; i++)
        {
            j = palette[i*3] + palette[i*3+1] + palette[i*3+2];
            if (j > k) { k = j; whitecol = i; }
        }
    }

    paletteloaded = 1;

    return 0;
}


//
// getclosestcol
//
int32_t getclosestcol(int32_t r, int32_t g, int32_t b)
{
    int32_t i, j, k, dist, mindist, retcol;
    const char *pal1;

    j = (r>>3)*FASTPALGRIDSIZ*FASTPALGRIDSIZ
        + (g>>3)*FASTPALGRIDSIZ + (b>>3)
        + FASTPALGRIDSIZ*FASTPALGRIDSIZ
        + FASTPALGRIDSIZ+1;
    mindist = min(rdist[coldist[r&7]+64+8],gdist[coldist[g&7]+64+8]);
    mindist = min(mindist,bdist[coldist[b&7]+64+8]);
    mindist++;

    r = 64-r; g = 64-g; b = 64-b;

    retcol = -1;
    for (k=26; k>=0; k--)
    {
        i = colscan[k]+j; if ((colhere[i>>3]&pow2char[i&7]) == 0) continue;
        i = colhead[i];
        do
        {
            pal1 = (char *)&palette[i*3];
            dist = gdist[pal1[1]+g];
            if (dist < mindist)
            {
                dist += rdist[pal1[0]+r];
                if (dist < mindist)
                {
                    dist += bdist[pal1[2]+b];
                    if (dist < mindist) { mindist = dist; retcol = i; }
                }
            }
            i = colnext[i];
        }
        while (i >= 0);
    }
    if (retcol >= 0) return(retcol);

    mindist = INT32_MAX;
    pal1 = (char *)&palette[768-3];
    for (i=255; i>=0; i--,pal1-=3)
    {
        dist = gdist[pal1[1]+g]; if (dist >= mindist) continue;
        dist += rdist[pal1[0]+r]; if (dist >= mindist) continue;
        dist += bdist[pal1[2]+b]; if (dist >= mindist) continue;
        mindist = dist; retcol = i;
    }
    return(retcol);
}


////////// SPRITE LIST MANIPULATION FUNCTIONS //////////

///// sector lists of sprites /////

// insert sprite at the head of sector list, change .sectnum
void do_insertsprite_at_headofsect(int16_t spritenum, int16_t sectnum)
{
    int16_t ohead = headspritesect[sectnum];

    prevspritesect[spritenum] = -1;
    nextspritesect[spritenum] = ohead;
    if (ohead >= 0)
        prevspritesect[ohead] = spritenum;
    headspritesect[sectnum] = spritenum;

    sprite[spritenum].sectnum = sectnum;
}

// remove sprite 'deleteme' from its sector list
void do_deletespritesect(int16_t deleteme)
{
    int32_t sectnum = sprite[deleteme].sectnum;
    int32_t prev = prevspritesect[deleteme], next = nextspritesect[deleteme];

    if (headspritesect[sectnum] == deleteme)
        headspritesect[sectnum] = next;
    if (prev >= 0)
        nextspritesect[prev] = next;
    if (next >= 0)
        prevspritesect[next] = prev;
}

///// now, status lists /////

// insert sprite at head of status list, change .statnum
void do_insertsprite_at_headofstat(int16_t spritenum, int16_t statnum)
{
    int16_t ohead = headspritestat[statnum];

    prevspritestat[spritenum] = -1;
    nextspritestat[spritenum] = ohead;
    if (ohead >= 0)
        prevspritestat[ohead] = spritenum;
    headspritestat[statnum] = spritenum;

    sprite[spritenum].statnum = statnum;
}

// insertspritestat (internal)
int32_t insertspritestat(int16_t statnum)
{
    int16_t blanktouse;

    if ((statnum >= MAXSTATUS) || (headspritestat[MAXSTATUS] == -1))
        return(-1);  //list full

    // remove one sprite from the statnum-freelist
    blanktouse = headspritestat[MAXSTATUS];
    headspritestat[MAXSTATUS] = nextspritestat[blanktouse];

    // make back-link of the new freelist head point to nil
    if (headspritestat[MAXSTATUS] >= 0)
        prevspritestat[headspritestat[MAXSTATUS]] = -1;
    else
        tailspritefree = -1;

    do_insertsprite_at_headofstat(blanktouse, statnum);

    return(blanktouse);
}

// remove sprite 'deleteme' from its status list
static void do_deletespritestat(int16_t deleteme)
{
    int32_t sectnum = sprite[deleteme].statnum;
    int32_t prev = prevspritestat[deleteme], next = nextspritestat[deleteme];

    if (headspritestat[sectnum] == deleteme)
        headspritestat[sectnum] = next;
    if (prev >= 0)
        nextspritestat[prev] = next;
    if (next >= 0)
        prevspritestat[next] = prev;
}


//
// insertsprite
//
int32_t insertsprite(int16_t sectnum, int16_t statnum)
{
    // TODO: guard against bad sectnum?
    int32_t newspritenum = insertspritestat(statnum);

    if (newspritenum >= 0)
    {
        Bassert((unsigned)sectnum < MAXSECTORS);

        do_insertsprite_at_headofsect(newspritenum, sectnum);
        Numsprites++;
    }

    return newspritenum;

}

//
// deletesprite
//
int32_t deletesprite(int16_t spritenum)
{
    Bassert((sprite[spritenum].statnum == MAXSTATUS)
            == (sprite[spritenum].sectnum == MAXSECTORS));

    if (sprite[spritenum].statnum == MAXSTATUS)
        return(-1);  // already not in the world

    do_deletespritestat(spritenum);
    do_deletespritesect(spritenum);

    // (dummy) insert at tail of sector freelist, compat
    // for code that checks .sectnum==MAXSECTOR
    sprite[spritenum].sectnum = MAXSECTORS;

    // insert at tail of status freelist
    prevspritestat[spritenum] = tailspritefree;
    nextspritestat[spritenum] = -1;
    if (tailspritefree >= 0)
        nextspritestat[tailspritefree] = spritenum;
    else
        headspritestat[MAXSTATUS] = spritenum;
    sprite[spritenum].statnum = MAXSTATUS;

    tailspritefree = spritenum;
    Numsprites--;

    return 0;
}

//
// changespritesect
//
int32_t changespritesect(int16_t spritenum, int16_t newsectnum)
{
    // XXX: NOTE: MAXSECTORS is allowed
    if (newsectnum < 0 || newsectnum > MAXSECTORS)
        return(-1);
    if (sprite[spritenum].sectnum == MAXSECTORS)
        return(-1);
    if (sprite[spritenum].sectnum == newsectnum)
        return(0);

    do_deletespritesect(spritenum);
    do_insertsprite_at_headofsect(spritenum, newsectnum);

    return(0);
}

//
// changespritestat
//
int32_t changespritestat(int16_t spritenum, int16_t newstatnum)
{
    // XXX: NOTE: MAXSTATUS is allowed
    if (newstatnum < 0 || newstatnum > MAXSTATUS)
        return(-1);
    if (sprite[spritenum].statnum == MAXSTATUS)
        return(-1);  // can't set the statnum of a sprite not in the world
    if (sprite[spritenum].statnum == newstatnum)
        return(0);  // sprite already has desired statnum

    do_deletespritestat(spritenum);
    do_insertsprite_at_headofstat(spritenum, newstatnum);

    return(0);
}


//
// lintersect (internal)
//
static int32_t lintersect(int32_t x1, int32_t y1, int32_t z1,
                          int32_t x2, int32_t y2, int32_t z2,
                          int32_t x3, int32_t y3, int32_t x4, int32_t y4,
                          int32_t *intx, int32_t *inty, int32_t *intz)
{
    //p1 to p2 is a line segment
    int32_t x21, y21, x34, y34, x31, y31, bot, topt, topu, t;

    x21 = x2-x1; x34 = x3-x4;
    y21 = y2-y1; y34 = y3-y4;
    bot = x21*y34 - y21*x34;
    if (bot >= 0)
    {
        if (bot == 0) return(0);
        x31 = x3-x1; y31 = y3-y1;
        topt = x31*y34 - y31*x34; if ((topt < 0) || (topt >= bot)) return(0);
        topu = x21*y31 - y21*x31; if ((topu < 0) || (topu >= bot)) return(0);
    }
    else
    {
        x31 = x3-x1; y31 = y3-y1;
        topt = x31*y34 - y31*x34; if ((topt > 0) || (topt <= bot)) return(0);
        topu = x21*y31 - y21*x31; if ((topu > 0) || (topu <= bot)) return(0);
    }
    t = divscale24(topt,bot);
    *intx = x1 + mulscale24(x21,t);
    *inty = y1 + mulscale24(y21,t);
    *intz = z1 + mulscale24(z2-z1,t);
    return(1);
}


int32_t lineintersect(int32_t x1, int32_t y1, int32_t z1, int32_t x2, int32_t y2, int32_t z2, int32_t x3,
                      int32_t y3, int32_t x4, int32_t y4, int32_t *intx, int32_t *inty, int32_t *intz)
{
    return lintersect(x1, y1, z1, x2, y2, z2, x3, y3, x4, y4, intx, inty, intz);
}

//
// rintersect (internal)
//
// returns: -1 if didn't intersect, coefficient (x3--x4 fraction)<<16 else
static int32_t rintersect(int32_t x1, int32_t y1, int32_t z1,
                          int32_t vx_, int32_t vy_, int32_t vz,
                          int32_t x3, int32_t y3, int32_t x4, int32_t y4,
                          int32_t *intx, int32_t *inty, int32_t *intz)
{
    //p1 towards p2 is a ray
    int64_t topt, topu, t;

    const int64_t vx=vx_, vy=vy_;
    const int64_t x34=x3-x4, y34=y3-y4;
    const int64_t bot = vx*y34 - vy*x34;

    if (bot == 0)
        return -1;

    if (bot >= 0)
    {
        int64_t x31=x3-x1, y31 = y3-y1;
        topt = x31*y34 - y31*x34; if (topt < 0) return -1;
        topu = vx*y31 - vy*x31; if (topu < 0 || topu >= bot) return -1;
    }
    else
    {
        int32_t x31=x3-x1, y31=y3-y1;
        topt = x31*y34 - y31*x34; if (topt > 0) return -1;
        topu = vx*y31 - vy*x31; if (topu > 0 || topu <= bot) return -1;
    }

    t = (topt<<16)/bot;
    *intx = x1 + ((vx*t)>>16);
    *inty = y1 + ((vy*t)>>16);
    *intz = z1 + ((vz*t)>>16);

    t = (topu<<16)/bot;
    Bassert((unsigned)t < 65536);

    return t;
}

int32_t rayintersect(int32_t x1, int32_t y1, int32_t z1, int32_t vx, int32_t vy, int32_t vz, int32_t x3,
                     int32_t y3, int32_t x4, int32_t y4, int32_t *intx, int32_t *inty, int32_t *intz)
{
    return (rintersect(x1, y1, z1, vx, vy, vz, x3, y3, x4, y4, intx, inty, intz) != -1);
}

//
// keepaway (internal)
//
static inline void keepaway(int32_t *x, int32_t *y, int32_t w)
{
    int32_t dx, dy, ox, oy, x1, y1;
    char first;

    x1 = clipit[w].x1; dx = clipit[w].x2-x1;
    y1 = clipit[w].y1; dy = clipit[w].y2-y1;
    ox = ksgn(-dy); oy = ksgn(dx);
    first = (klabs(dx) <= klabs(dy));

    while (1)
    {
        if (dx*(*y-y1) > (*x-x1)*dy) return;
        if (first == 0) *x += ox; else *y += oy;
        first ^= 1;
    }
}


//
// raytrace (internal)
//
static inline int32_t raytrace(int32_t x3, int32_t y3, int32_t *x4, int32_t *y4)
{
    int32_t x1, y1, x2, y2, bot, topu, nintx, ninty, cnt, z, hitwall;
    int32_t x21, y21, x43, y43;

    hitwall = -1;
    for (z=clipnum-1; z>=0; z--)
    {
        x1 = clipit[z].x1; x2 = clipit[z].x2; x21 = x2-x1;
        y1 = clipit[z].y1; y2 = clipit[z].y2; y21 = y2-y1;

        topu = x21*(y3-y1) - (x3-x1)*y21; if (topu <= 0) continue;
        if (x21*(*y4-y1) > (*x4-x1)*y21) continue;
        x43 = *x4-x3; y43 = *y4-y3;
        if (x43*(y1-y3) > (x1-x3)*y43) continue;
        if (x43*(y2-y3) <= (x2-x3)*y43) continue;
        bot = x43*y21 - x21*y43; if (bot == 0) continue;

        cnt = 256;
        do
        {
            cnt--; if (cnt < 0) { *x4 = x3; *y4 = y3; return(z); }
            nintx = x3 + scale(x43,topu,bot);
            ninty = y3 + scale(y43,topu,bot);
            topu--;
        }
        while (x21*(ninty-y1) <= (nintx-x1)*y21);

        if (klabs(x3-nintx)+klabs(y3-ninty) < klabs(x3-*x4)+klabs(y3-*y4))
            { *x4 = nintx; *y4 = ninty; hitwall = z; }
    }
    return(hitwall);
}



//
// Exported Engine Functions
//

#if !defined _WIN32 && defined DEBUGGINGAIDS && !defined GEKKO
#ifdef GEKKO
#define __rtems__
#define _POSIX_REALTIME_SIGNALS
#endif
#include <signal.h>
static void sighandler(int sig, siginfo_t *info, void *ctx)
{
    const char *s;
    UNREFERENCED_PARAMETER(ctx);
    switch (sig)
    {
    case SIGFPE:
        switch (info->si_code)
        {
        case FPE_INTDIV:
            s = "FPE_INTDIV (integer divide by zero)"; break;
        case FPE_INTOVF:
            s = "FPE_INTOVF (integer overflow)"; break;
        case FPE_FLTDIV:
            s = "FPE_FLTDIV (floating-point divide by zero)"; break;
        case FPE_FLTOVF:
            s = "FPE_FLTOVF (floating-point overflow)"; break;
        case FPE_FLTUND:
            s = "FPE_FLTUND (floating-point underflow)"; break;
        case FPE_FLTRES:
            s = "FPE_FLTRES (floating-point inexact result)"; break;
        case FPE_FLTINV:
            s = "FPE_FLTINV (floating-point invalid operation)"; break;
        case FPE_FLTSUB:
            s = "FPE_FLTSUB (floating-point subscript out of range)"; break;
        default:
            s = "?! (unknown)"; break;
        }
        ERRprintf("Caught SIGFPE at address %p, code %s. Aborting.\n", info->si_addr, s);
        break;
    default:
        break;
    }
    abort();
}
#endif

//
// preinitengine
//
static int32_t preinitcalled = 0;

// #define DYNALLOC_ARRAYS

#ifndef DYNALLOC_ARRAYS
# if !defined DEBUG_MAIN_ARRAYS
static spriteext_t spriteext_s[MAXSPRITES+MAXUNIQHUDID];
static spritesmooth_t spritesmooth_s[MAXSPRITES+MAXUNIQHUDID];
static sectortype sector_s[MAXSECTORS + M32_FIXME_SECTORS];
static walltype wall_s[MAXWALLS + M32_FIXME_WALLS];
static spritetype sprite_s[MAXSPRITES];
static spritetype tsprite_s[MAXSPRITESONSCREEN];
# endif
#else
void *blockptr = NULL;
#endif

int32_t preinitengine(void)
{
    char *e;
    if (initsystem()) exit(9);

    makeasmwriteable();

#ifdef DYNALLOC_ARRAYS
    {
        size_t i, size = 0;

        // allocate everything at once...  why not?  entries can just be added to this table
        // to allocate future arrays without further intervention
        struct
        {
            void **ptr;
            size_t size;
        }
        dynarray[] =
        {
            { (void **) &sector,           sizeof(sectortype)      *MAXSECTORS                },
            { (void **) &wall,             sizeof(walltype)        *MAXWALLS }, // +512: editor quirks. FIXME!
            { (void **) &sprite,           sizeof(spritetype)      *MAXSPRITES                },
            { (void **) &tsprite,          sizeof(spritetype)      *MAXSPRITESONSCREEN        },
            { (void **) &spriteext,        sizeof(spriteext_t)     *(MAXSPRITES+MAXUNIQHUDID) },
            { (void **) &spritesmooth,     sizeof(spritesmooth_t) *(MAXSPRITES+MAXUNIQHUDID) },
            { (void **) &state_compress,   sizeof(qlz_state_compress)                         },
            { (void **) &state_decompress, sizeof(qlz_state_decompress)                       }
        };

        if (editstatus)
        {
            dynarray[0].size += M32_FIXME_SECTORS*sizeof(sectortype);  // join sectors needs a temp. sector
            dynarray[1].size += M32_FIXME_WALLS*sizeof(walltype);
//            Bprintf("FIXME: Allocating additional space beyond wall[] for editor bugs.\n");
        }

        for (i=0; i<(signed)(sizeof(dynarray)/sizeof(dynarray[0])); i++)
            size += dynarray[i].size;

        if ((blockptr = Bcalloc(1, size)) == NULL)
            return 1;

        size = 0;

        for (i=0; i<(signed)(sizeof(dynarray)/sizeof(dynarray[0])); i++)
        {
            *dynarray[i].ptr = (int8_t *)blockptr + size;
            size += dynarray[i].size;
        }
    }

#else
# if !defined DEBUG_MAIN_ARRAYS
    sector = sector_s;
    wall = wall_s;
    sprite = sprite_s;
    tsprite = tsprite_s;
    spriteext = spriteext_s;
    spritesmooth = spritesmooth_s;
# endif
    state_compress = (qlz_state_compress *) Bcalloc(sizeof(qlz_state_compress) + sizeof(qlz_state_decompress), 1);
    state_decompress = (qlz_state_decompress *)((int8_t *)(state_compress) + sizeof(qlz_state_compress));
#endif

    if ((e = Bgetenv("BUILD_NOP6")) != NULL)
        if (!Bstrcasecmp(e, "TRUE"))
        {
            Bprintf("Disabling P6 optimizations.\n");
            dommxoverlay = 0;
        }
    if (dommxoverlay) mmxoverlay();

    validmodecnt = 0;
    getvalidmodes();

    initcrc32table();
#ifdef HAVE_CLIPSHAPE_FEATURE
    clipmapinfo_init();
#endif
    preinitcalled = 1;
    return 0;
}


//
// initengine
//
int32_t initengine(void)
{
    int32_t i, j;

#if !defined _WIN32 && defined DEBUGGINGAIDS && !defined GEKKO
    struct sigaction sigact, oldact;
    memset(&sigact, 0, sizeof(sigact));
    sigact.sa_sigaction = &sighandler;
    sigact.sa_flags = SA_SIGINFO;
    sigaction(SIGFPE, &sigact, &oldact);
#endif

    if (!preinitcalled)
    {
        i = preinitengine();
        if (i) return i;
    }

#ifdef YAX_DEBUG
    u64tickspersec = (double)getu64tickspersec();
    if (u64tickspersec==0.0)
        u64tickspersec = 1.0;
#endif

    if (loadtables())
        return 1;

    xyaspect = -1;

    showinvisibility = 0;

    for (i=1; i<1024; i++)
        lowrecip[i] = ((1<<24)-1)/i;

    for (i=0; i<MAXVOXELS; i++)
        for (j=0; j<MAXVOXMIPS; j++)
        {
            voxoff[i][j] = 0L;
            voxlock[i][j] = 200;
        }
    for (i=0; i<MAXTILES; i++)
        tiletovox[i] = -1;
    clearbuf(voxscale, sizeof(voxscale)>>2, 65536);

    paletteloaded = 0;

    searchit = 0; searchstat = -1;

    totalclock = 0;
    g_visibility = 512;
    parallaxvisibility = 512;

    if (loadpalette())
        return 1;

#ifdef USE_OPENGL
    if (!hicfirstinit) hicinit();
    if (!mdinited) mdinit();
#endif

#ifdef LUNATIC
    if (L_CreateState(&g_engState, "eng", NULL))
        return loadpalette_err("Failed creating engine Lua state!");

    {
        char *luastr = "_LUNATIC_AUX=true; decl=require('ffi').cdef; require'defs_common'";

        if (L_RunString(&g_engState, luastr, 0, -1, "eng"))
            return loadpalette_err("Failed setting up engine Lua state");
    }
#endif

    return 0;
}


#define DO_FREE_AND_NULL(var) do { \
    if (var != NULL) { Bfree(var); var = NULL; } \
} while (0)

//
// uninitengine
//
void uninitengine(void)
{
    int32_t i;

    //OSD_Printf("cacheresets = %d, cacheinvalidates = %d\n", cacheresets, cacheinvalidates);

#ifdef USE_OPENGL
    polymost_glreset();
    hicinit();
    freeallmodels();
# ifdef POLYMER
    polymer_uninit();
# endif
#endif

    if (artfil != -1)
        kclose(artfil);

    // this leaves a bunch of invalid pointers in waloff... fixme?
    for (i=0; i<MAXTILEFILES; i++)
        DO_FREE_AND_NULL(artptrs[i]);

    DO_FREE_AND_NULL(transluc);
    DO_FREE_AND_NULL(pic);
    DO_FREE_AND_NULL(lookups);

    for (i=0; i<MAXPALOOKUPS; i++)
        if (palookup[i] != NULL && (i==0 || palookup[i] != palookup[0]))
        {
            // Take care of handling aliased ^^^ cases!
            Bfree(palookup[i]);
        }

#ifdef DYNALLOC_ARRAYS
    DO_FREE_AND_NULL(blockptr);
#else
    DO_FREE_AND_NULL(state_compress);
#endif

    uninitsystem();
}


//
// initspritelists
//
void initspritelists(void)
{
    int32_t i;

    // initial list state for statnum lists:
    //
    //  statnum 0: nil
    //  statnum 1: nil
    //     . . .
    //  statnum MAXSTATUS-1: nil
    //  "statnum MAXSTATUS": nil <- 0 <-> 1 <-> 2 <-> ... <-> MAXSPRITES-1 -> nil
    //
    // That is, the dummy MAXSTATUS statnum has all sprites.

    for (i=0; i<MAXSECTORS; i++)   //Init doubly-linked sprite sector lists
        headspritesect[i] = -1;
    headspritesect[MAXSECTORS] = 0;

    for (i=0; i<MAXSPRITES; i++)
    {
        prevspritesect[i] = i-1;
        nextspritesect[i] = i+1;
        sprite[i].sectnum = MAXSECTORS;
    }
    prevspritesect[0] = -1;
    nextspritesect[MAXSPRITES-1] = -1;


    for (i=0; i<MAXSTATUS; i++)   //Init doubly-linked sprite status lists
        headspritestat[i] = -1;
    headspritestat[MAXSTATUS] = 0;

    for (i=0; i<MAXSPRITES; i++)
    {
        prevspritestat[i] = i-1;
        nextspritestat[i] = i+1;
        sprite[i].statnum = MAXSTATUS;
    }
    prevspritestat[0] = -1;
    nextspritestat[MAXSPRITES-1] = -1;

    tailspritefree = MAXSPRITES-1;
    Numsprites = 0;
}


void set_globalang(int16_t ang)
{
    globalang = ang&2047;
    cosglobalang = sintable[(globalang+512)&2047];
    singlobalang = sintable[globalang&2047];
    cosviewingrangeglobalang = mulscale16(cosglobalang,viewingrange);
    sinviewingrangeglobalang = mulscale16(singlobalang,viewingrange);
}

//
// drawrooms
//
int32_t drawrooms(int32_t daposx, int32_t daposy, int32_t daposz,
               int16_t daang, int32_t dahoriz, int16_t dacursectnum)
{
    int32_t i, j, /*cz, fz,*/ closest;
    int16_t *shortptr1, *shortptr2;

    int32_t didmirror = 0;

    beforedrawrooms = 0;
    indrawroomsandmasks = 1;

    globalposx = daposx; globalposy = daposy; globalposz = daposz;
    set_globalang(daang);

    global100horiz = dahoriz;

    // xdimenscale is scale(xdimen,yxaspect,320);
    // normalization by viewingrange so that center-of-aim doesn't depend on it
    globalhoriz = mulscale16(dahoriz-100,divscale16(xdimenscale,viewingrange))+(ydimen>>1);

    globaluclip = (0-globalhoriz)*xdimscale;
    globaldclip = (ydimen-globalhoriz)*xdimscale;

    i = mulscale16(xdimenscale,viewingrangerecip);
    globalpisibility = mulscale16(parallaxvisibility,i);
    switch (getrendermode())
    {
        // switch on renderers to make fog look almost the same everywhere

    case REND_CLASSIC:
        globalvisibility = mulscale16(g_visibility,i);
        break;
#ifdef USE_OPENGL
    case REND_POLYMOST:
        // NOTE: In Polymost, the fragment depth depends on the x screen size!
        if (r_usenewshading==2)
            globalvisibility = scale(g_visibility<<2, xdimen, 1680);
        else
            globalvisibility = scale(g_visibility<<2, xdimen, 1100);
        break;
# ifdef POLYMER
    case REND_POLYMER:
        globalvisibility = g_visibility<<2;
        break;
# endif
#endif
    }

    globalhisibility = mulscale16(globalvisibility,xyaspect);
    globalcisibility = mulscale8(globalhisibility,320);

    globalcursectnum = dacursectnum;
    totalclocklock = totalclock;

    if ((xyaspect != oxyaspect) || (xdimen != oxdimen) || (viewingrange != oviewingrange))
        dosetaspect();

    Bmemset(gotsector, 0, ((numsectors+7)>>3));

    if (getrendermode() != REND_CLASSIC
#ifdef YAX_ENABLE
        || yax_globallev==YAX_MAXDRAWS
#endif
        )
    {
        shortptr1 = (int16_t *)&startumost[windowx1];
        shortptr2 = (int16_t *)&startdmost[windowx1];
        i = xdimen-1;
        do
        {
            umost[i] = shortptr1[i]-windowy1;
            dmost[i] = shortptr2[i]-windowy1;
        }
        while (i--);  // xdimen == 1 is OK!
        umost[0] = shortptr1[0]-windowy1;
        dmost[0] = shortptr2[0]-windowy1;
    }

#ifdef USE_OPENGL
# ifdef POLYMER
    if (getrendermode() == REND_POLYMER)
    {
#  ifdef YAX_ENABLE
        // BEGIN_TWEAK ceiling/floor fake 'TROR' pics, see END_TWEAK in build.c
        if (editstatus && showinvisibility)
        {
            for (i=0; i<numyaxbunches; i++)
            {
                yax_tweakpicnums(i, YAX_CEILING, 0);
                yax_tweakpicnums(i, YAX_FLOOR, 0);
            }
        }
#  endif
        polymer_glinit();
        polymer_drawrooms(daposx, daposy, daposz, daang, dahoriz, dacursectnum);
        bglDisable(GL_CULL_FACE);
        gloy1 = 0;
        return 0;
    }
# endif

    //============================================================================= //POLYMOST BEGINS
    polymost_drawrooms();

    if (getrendermode() != REND_CLASSIC)
        return 0;
    //============================================================================= //POLYMOST ENDS
#endif

    begindrawing(); //{{{

#ifdef ENGINE_CLEAR_SCREEN
#ifdef YAX_ENABLE
    if (!g_nodraw)
#endif
    if (numyaxbunches==0)
        draw_rainbow_background();
#endif

    frameoffset = frameplace + windowy1*bytesperline + windowx1;

    //if (smostwallcnt < 0)
    //  if (getkensmessagecrc(FP_OFF(kensmessage)) != 0x56c764d4)
    //      { /* setvmode(0x3);*/ OSD_Printf("Nice try.\n"); exit(0); }

    numhits = xdimen; numscans = 0; numbunches = 0;
    maskwallcnt = 0; smostwallcnt = 0; smostcnt = 0; spritesortcnt = 0;

#ifdef YAX_ENABLE
    if (yax_globallev != YAX_MAXDRAWS)
    {
        j = yax_globalbunch*xdimen;

        Bmemcpy(umost, yumost+j, xdimen*sizeof(int16_t));
        Bmemcpy(dmost, ydmost+j, xdimen*sizeof(int16_t));

        for (i=0; i<xdimen; i++)
            if (umost[i] > dmost[i])
                numhits--;

//        yaxdebug("cf %d, tlev %d, bunch %d: numhits=%d", yax_globalcf, yax_globallev, yax_globalbunch, numhits);
    }
#endif

    if (globalcursectnum >= MAXSECTORS)
        globalcursectnum -= MAXSECTORS;
    else
    {
        i = globalcursectnum;
        updatesector(globalposx,globalposy,&globalcursectnum);
        if (globalcursectnum < 0) globalcursectnum = i;

        // PK 20110123: I'm not sure what the line above is supposed to do, but 'i'
        //              *can* be negative, so let's just quit here in that case...
        if (globalcursectnum<0)
        {
            enddrawing();  //!!!
            return 0;
        }
    }
/*
    globparaceilclip = 1;
    globparaflorclip = 1;
    getzsofslope(globalcursectnum,globalposx,globalposy,&cz,&fz);
    if (globalposz < cz) globparaceilclip = 0;
    if (globalposz > fz) globparaflorclip = 0;
*/
    scansector(globalcursectnum);

    if (inpreparemirror)
    {
        // INPREPAREMIRROR_NO_BUNCHES
        // numbunches==0 can happen if the mirror is far away... the game code decides
        // to draw it, but scansector gets zero bunches.  Result: big screwup!
        // Leave inpreparemirror as is, it's restored by completemirror.
        if (numbunches==0)
        {
            enddrawing();  //!!!
            return 0;
        }

        inpreparemirror = 0;
        didmirror = 1;

        mirrorsx1 = xdimen-1; mirrorsx2 = 0;
        for (i=numscans-1; i>=0; i--)
        {
            if (wall[thewall[i]].nextsector >= 0)
            {
                if (xb1[i] < mirrorsx1) mirrorsx1 = xb1[i];
                if (xb2[i] > mirrorsx2) mirrorsx2 = xb2[i];
            }
        }

        for (i=0; i<mirrorsx1; i++)
            if (umost[i] <= dmost[i])
                { umost[i] = 1; dmost[i] = 0; numhits--; }
        for (i=mirrorsx2+1; i<xdimen; i++)
            if (umost[i] <= dmost[i])
                { umost[i] = 1; dmost[i] = 0; numhits--; }

        drawalls(0L);
        numbunches--;
        bunchfirst[0] = bunchfirst[numbunches];
        bunchlast[0] = bunchlast[numbunches];

        mirrorsy1 = min(umost[mirrorsx1],umost[mirrorsx2]);
        mirrorsy2 = max(dmost[mirrorsx1],dmost[mirrorsx2]);
    }

    while ((numbunches > 0) && (numhits > 0))
    {
        Bmemset(tempbuf, 0, numbunches);
        tempbuf[0] = 1;

        closest = 0;              //Almost works, but not quite :(
        for (i=1; i<numbunches; i++)
        {
            if ((j = bunchfront(i,closest)) < 0) continue;
            tempbuf[i] = 1;
            if (j == 0) tempbuf[closest] = 1, closest = i;
        }
        for (i=0; i<numbunches; i++) //Double-check
        {
            if (tempbuf[i]) continue;
            if ((j = bunchfront(i,closest)) < 0) continue;
            tempbuf[i] = 1;
            if (j == 0) tempbuf[closest] = 1, closest = i, i = 0;
        }

        drawalls(closest);

        numbunches--;
        bunchfirst[closest] = bunchfirst[numbunches];
        bunchlast[closest] = bunchlast[numbunches];
    }

    enddrawing();   //}}}

    return didmirror;
}

// UTILITY TYPES AND FUNCTIONS FOR DRAWMASKS OCCLUSION TREE
// typedef struct          s_maskleaf
// {
//     int32_t                index;
//     _point2d            p1, p2;
//     _equation           maskeq, p1eq, p2eq;
//     struct s_maskleaf*  branch[MAXWALLSB];
//     int32_t                 drawing;
// }                       _maskleaf;
//
// _maskleaf               maskleaves[MAXWALLSB];

// returns equation of a line given two points
static inline _equation       equation(float x1, float y1, float x2, float y2)
{
    _equation   ret;

    if ((x2 - x1) != 0)
    {
        ret.a = (float)(y2 - y1)/(float)(x2 - x1);
        ret.b = -1;
        ret.c = (y1 - (ret.a * x1));
    }
    else // vertical
    {
        ret.a = 1;
        ret.b = 0;
        ret.c = -x1;
    }

    return (ret);
}

int32_t                 wallvisible(int32_t x, int32_t y, int16_t wallnum)
{
    // 1 if wall is in front of player 0 otherwise
    int32_t            a1, a2;
    walltype        *w1, *w2;

    w1 = &wall[wallnum];
    w2 = &wall[w1->point2];

    a1 = getangle(w1->x - x, w1->y - y);
    a2 = getangle(w2->x - x, w2->y - y);

    //if ((wallnum == 23) || (wallnum == 9))
    //    OSD_Printf("Wall %d : %d - sector %d - x %d - y %d.\n", wallnum, (a2 + (2048 - a1)) & 2047, globalcursectnum, globalposx, globalposy);

    if (((a2 + (2048 - a1)) & 2047) <= 1024)
        return (1);
    return (0);
}

#if 0
// returns the intersection point between two lines
_point2d        intersection(_equation eq1, _equation eq2)
{
    _point2d    ret;
    float       det;

    det = (float)(1) / (eq1.a*eq2.b - eq2.a*eq1.b);
    ret.x = ((eq1.b*eq2.c - eq2.b*eq1.c) * det);
    ret.y = ((eq2.a*eq1.c - eq1.a*eq2.c) * det);

    return (ret);
}

// check if a point that's on the line is within the segment boundaries
int32_t             pointonmask(_point2d point, _maskleaf* wall)
{
    if ((min(wall->p1.x, wall->p2.x) <= point.x) && (point.x <= max(wall->p1.x, wall->p2.x)) && (min(wall->p1.y, wall->p2.y) <= point.y) && (point.y <= max(wall->p1.y, wall->p2.y)))
        return (1);
    return (0);
}

// returns 1 if wall2 is hidden by wall1
int32_t             wallobstructswall(_maskleaf* wall1, _maskleaf* wall2)
{
    _point2d    cross;

    cross = intersection(wall2->p1eq, wall1->maskeq);
    if (pointonmask(cross, wall1))
        return (1);

    cross = intersection(wall2->p2eq, wall1->maskeq);
    if (pointonmask(cross, wall1))
        return (1);

    cross = intersection(wall1->p1eq, wall2->maskeq);
    if (pointonmask(cross, wall2))
        return (1);

    cross = intersection(wall1->p2eq, wall2->maskeq);
    if (pointonmask(cross, wall2))
        return (1);

    return (0);
}

// recursive mask drawing function
static inline void    drawmaskleaf(_maskleaf* wall)
{
    int32_t i;

    wall->drawing = 1;
    i = 0;
    while (wall->branch[i] != NULL)
    {
        if (wall->branch[i]->drawing == 0)
        {
            //OSD_Printf("Drawing parent of %i : mask %i\n", wall->index, wall->branch[i]->index);
            drawmaskleaf(wall->branch[i]);
        }
        i++;
    }

    //OSD_Printf("Drawing mask %i\n", wall->index);
    drawmaskwall(wall->index);
}
#endif

static inline int32_t         sameside(_equation *eq, _point2d *p1, _point2d *p2)
{
    float   sign1, sign2;

    sign1 = eq->a * p1->x + eq->b * p1->y + eq->c;
    sign2 = eq->a * p2->x + eq->b * p2->y + eq->c;

    sign1 = sign1 * sign2;
    if (sign1 > 0)
    {
        //OSD_Printf("SAME SIDE !\n");
        return (1);
    }
    //OSD_Printf("OPPOSITE SIDE !\n");
    return (0);
}


//
// drawmasks
//
void drawmasks(void)
{
    int32_t i, modelp=0;

    for (i=spritesortcnt-1; i>=0; i--)
        tspriteptr[i] = &tsprite[i];

    for (i=spritesortcnt-1; i>=0; i--)
    {
        const int32_t xs = tspriteptr[i]->x-globalposx, ys = tspriteptr[i]->y-globalposy;
        const int32_t yp = dmulscale6(xs,cosviewingrangeglobalang,ys,sinviewingrangeglobalang);
#ifdef USE_OPENGL
        modelp = (usemodels && tile2model[tspriteptr[i]->picnum].modelid >= 0);
#endif
        if (yp > (4<<8))
        {
            const int32_t xp = dmulscale6(ys,cosglobalang,-xs,singlobalang);

            if (mulscale24(labs(xp+yp),xdimen) >= yp)
                goto killsprite;

            spritesx[i] = scale(xp+yp,xdimen<<7,yp);
        }
        else if ((tspriteptr[i]->cstat&48) == 0)
        {
killsprite:
            if (!modelp)
            {
                spritesortcnt--;  //Delete face sprite if on wrong side!
                if (i != spritesortcnt)
                {
                    tspriteptr[i] = tspriteptr[spritesortcnt];
                    spritesx[i] = spritesx[spritesortcnt];
                    spritesy[i] = spritesy[spritesortcnt];
                }
                continue;
            }
        }
        spritesy[i] = yp;
    }

    {
        int32_t j, l, gap, ys;

        gap = 1; while (gap < spritesortcnt) gap = (gap<<1)+1;
        for (gap>>=1; gap>0; gap>>=1)   //Sort sprite list
            for (i=0; i<spritesortcnt-gap; i++)
                for (l=i; l>=0; l-=gap)
                {
                    if (spritesy[l] <= spritesy[l+gap]) break;
                    swaplong(&tspriteptr[l],&tspriteptr[l+gap]);
                    swaplong(&spritesx[l],&spritesx[l+gap]);
                    swaplong(&spritesy[l],&spritesy[l+gap]);
                }

        if (spritesortcnt > 0)
            spritesy[spritesortcnt] = (spritesy[spritesortcnt-1]^1);

        ys = spritesy[0]; i = 0;
        for (j=1; j<=spritesortcnt; j++)
        {
            int32_t k;

            if (spritesy[j] == ys)
                continue;

            ys = spritesy[j];

            if (j > i+1)
            {
                for (k=i; k<j; k++)
                {
                    const spritetype *const s = tspriteptr[k];

                    spritesz[k] = s->z;
                    if ((s->cstat&48) != 32)
                    {
                        int32_t yoff = picanm[s->picnum].yofs + s->yoffset;
                        int32_t yspan = (tilesizy[s->picnum]*s->yrepeat<<2);

                        spritesz[k] -= (yoff*s->yrepeat)<<2;

                        if (!(s->cstat&128))
                            spritesz[k] -= (yspan>>1);
                        if (klabs(spritesz[k]-globalposz) < (yspan>>1))
                            spritesz[k] = globalposz;
                    }
                }
                for (k=i+1; k<j; k++)
                    for (l=i; l<k; l++)
                        if (klabs(spritesz[k]-globalposz) < klabs(spritesz[l]-globalposz))
                        {
                            swaplong(&tspriteptr[k],&tspriteptr[l]);
                            swaplong(&spritesx[k],&spritesx[l]);
                            swaplong(&spritesy[k],&spritesy[l]);
                            swaplong(&spritesz[k],&spritesz[l]);
                        }
                for (k=i+1; k<j; k++)
                    for (l=i; l<k; l++)
                        if (tspriteptr[k]->statnum < tspriteptr[l]->statnum)
                        {
                            swaplong(&tspriteptr[k],&tspriteptr[l]);
                            swaplong(&spritesx[k],&spritesx[l]);
                            swaplong(&spritesy[k],&spritesy[l]);
                        }
            }
            i = j;
        }
    }

    begindrawing(); //{{{
#if 0
    for (i=spritesortcnt-1; i>=0; i--)
    {
        double xs = tspriteptr[i]->x-globalposx;
        double ys = tspriteptr[i]->y-globalposy;
        int32_t zs = tspriteptr[i]->z-globalposz;

        int32_t xp = ys*cosglobalang-xs*singlobalang;
        int32_t yp = (zs<<1);
        int32_t zp = xs*cosglobalang+ys*singlobalang;

        xs = ((double)xp*(halfxdimen<<12)/zp)+((halfxdimen+windowx1)<<12);
        ys = ((double)yp*(xdimenscale<<12)/zp)+((globalhoriz+windowy1)<<12);

        if (xs >= INT32_MIN && xs <= INT32_MAX && ys >= INT32_MIN && ys <= INT32_MAX)
        {
            drawline256(xs-65536,ys-65536,xs+65536,ys+65536,31);
            drawline256(xs+65536,ys-65536,xs-65536,ys+65536,31);
        }
    }
#endif
    {
        _point2d pos;

#ifdef USE_OPENGL
        curpolygonoffset = 0;
#endif
        pos.x = (float)globalposx;
        pos.y = (float)globalposy;

        // CAUTION: maskwallcnt and spritesortcnt may be zero!
        // Writing e.g. "while (maskwallcnt--)" is wrong!
        while (maskwallcnt)
        {
            _point2d dot, dot2, middle;
            // PLAG: sorting stuff
            _equation maskeq, p1eq, p2eq;

            const int32_t w = (getrendermode()==REND_POLYMER) ?
                maskwall[maskwallcnt-1] : thewall[maskwall[maskwallcnt-1]];

            const int32_t otherside_spr_first = (getrendermode() == REND_CLASSIC);

            maskwallcnt--;

            dot.x = (float)wall[w].x;
            dot.y = (float)wall[w].y;
            dot2.x = (float)wall[wall[w].point2].x;
            dot2.y = (float)wall[wall[w].point2].y;

            maskeq = equation(dot.x, dot.y, dot2.x, dot2.y);

            if (!otherside_spr_first)
            {
                p1eq = equation(pos.x, pos.y, dot.x, dot.y);
                p2eq = equation(pos.x, pos.y, dot2.x, dot2.y);

                middle.x = (dot.x + dot2.x) / 2;
                middle.y = (dot.y + dot2.y) / 2;
            }

            i = spritesortcnt;
            while (i)
            {
                i--;
                if (tspriteptr[i] != NULL)
                {
                    _point2d spr;

                    spr.x = (float)tspriteptr[i]->x;
                    spr.y = (float)tspriteptr[i]->y;

                    if (!sameside(&maskeq, &spr, &pos) &&
                        (otherside_spr_first ||
                         (sameside(&p1eq, &middle, &spr) &&
                          sameside(&p2eq, &middle, &spr))))
                    {
                        drawsprite(i);
                        tspriteptr[i] = NULL;
                    }
                }
            }

            drawmaskwall(maskwallcnt);
        }

        while (spritesortcnt)
        {
            spritesortcnt--;
            if (tspriteptr[spritesortcnt] != NULL)
                drawsprite(spritesortcnt);
        }
    }

#ifdef POLYMER
    if (getrendermode() == REND_POLYMER)
        polymer_drawmasks();
#endif

    indrawroomsandmasks = 0;
    enddrawing();   //}}}
}

static void get_floorspr_points(const spritetype *spr, int32_t px, int32_t py,
                               int32_t *x1, int32_t *x2, int32_t *x3, int32_t *x4,
                               int32_t *y1, int32_t *y2, int32_t *y3, int32_t *y4);

//
// drawmapview
//
void drawmapview(int32_t dax, int32_t day, int32_t zoome, int16_t ang)
{
    walltype *wal;
    sectortype *sec;
    spritetype *spr;
    int32_t i, j, k, l;
    int32_t x, y, x1, y1, x2, y2, x3, y3, x4, y4, bakx1, baky1;
    int32_t s, w, ox, oy, startwall, cx1, cy1, cx2, cy2;
    int32_t bakgxvect, bakgyvect, sortnum, gap, npoints;
    int32_t xvect, yvect, xvect2, yvect2, daslope;

    int32_t oyxaspect=yxaspect, oviewingrange=viewingrange;

    setaspect(65536, divscale16((320*5)/8, 200));

    beforedrawrooms = 0;

    Bmemset(gotsector, 0, (numsectors+7)>>3);

    cx1 = (windowx1<<12); cy1 = (windowy1<<12);
    cx2 = ((windowx2+1)<<12)-1; cy2 = ((windowy2+1)<<12)-1;

    zoome <<= 8;

    bakgxvect = divscale28(sintable[(1536-ang)&2047],zoome);
    bakgyvect = divscale28(sintable[(2048-ang)&2047],zoome);
    xvect = mulscale8(sintable[(2048-ang)&2047],zoome);
    yvect = mulscale8(sintable[(1536-ang)&2047],zoome);
    xvect2 = mulscale16(xvect,yxaspect);
    yvect2 = mulscale16(yvect,yxaspect);

    sortnum = 0;

    begindrawing(); //{{{

    for (s=0,sec=&sector[s]; s<numsectors; s++,sec++)
        if (show2dsector[s>>3]&pow2char[s&7])
        {
#ifdef YAX_ENABLE
            if (yax_getbunch(s, YAX_FLOOR) >= 0 && (sector[s].floorstat&(256+128))==0)
                continue;
#endif
            npoints = 0; i = 0;
            startwall = sec->wallptr;
#if 0
            for (w=sec->wallnum,wal=&wall[startwall]; w>0; w--,wal++)
            {
                ox = wal->x - dax; oy = wal->y - day;
                x = dmulscale16(ox,xvect,-oy,yvect) + (xdim<<11);
                y = dmulscale16(oy,xvect2,ox,yvect2) + (ydim<<11);
                i |= getclipmask(x-cx1,cx2-x,y-cy1,cy2-y);
                rx1[npoints] = x;
                ry1[npoints] = y;
                xb1[npoints] = wal->point2 - startwall;
                npoints++;
            }
#else
            j = startwall; l = 0;
            for (w=sec->wallnum,wal=&wall[startwall]; w>0; w--,wal++,j++)
            {
                k = lastwall(j);
                if ((k > j) && (npoints > 0)) { xb1[npoints-1] = l; l = npoints; } //overwrite point2
                //wall[k].x wal->x wall[wal->point2].x
                //wall[k].y wal->y wall[wal->point2].y
                if (!dmulscale1(wal->x-wall[k].x,wall[wal->point2].y-wal->y,-(wal->y-wall[k].y),wall[wal->point2].x-wal->x)) continue;
                ox = wal->x - dax; oy = wal->y - day;
                x = dmulscale16(ox,xvect,-oy,yvect) + (xdim<<11);
                y = dmulscale16(oy,xvect2,ox,yvect2) + (ydim<<11);
                i |= getclipmask(x-cx1,cx2-x,y-cy1,cy2-y);
                rx1[npoints] = x;
                ry1[npoints] = y;
                xb1[npoints] = npoints+1;
                npoints++;
            }
            if (npoints > 0) xb1[npoints-1] = l; //overwrite point2
#endif
            if ((i&0xf0) != 0xf0) continue;
            bakx1 = rx1[0]; baky1 = mulscale16(ry1[0]-(ydim<<11),xyaspect)+(ydim<<11);
            if (i&0x0f)
            {
                npoints = clippoly(npoints,i);
                if (npoints < 3) continue;
            }

            //Collect floor sprites to draw
            for (i=headspritesect[s]; i>=0; i=nextspritesect[i])
                if ((sprite[i].cstat&48) == 32)
                {
                    if ((sprite[i].cstat&(64+8)) == (64+8)) continue;
                    tsprite[sortnum++].owner = i;
                }

            gotsector[s>>3] |= pow2char[s&7];

            globalorientation = (int32_t)sec->floorstat;
            if ((globalorientation&1) != 0) continue;

            globalpal = sec->floorpal;

            if (palookup[sec->floorpal] != globalpalwritten)
            {
                globalpalwritten = palookup[sec->floorpal];
                if (!globalpalwritten) globalpalwritten = palookup[0];	// JBF: fixes null-pointer crash
                setpalookupaddress(globalpalwritten);
            }
            globalpicnum = sec->floorpicnum;
            if ((unsigned)globalpicnum >= (unsigned)MAXTILES) globalpicnum = 0;
            setgotpic(globalpicnum);
            if ((tilesizx[globalpicnum] <= 0) || (tilesizy[globalpicnum] <= 0)) continue;
            DO_TILE_ANIM(globalpicnum, s);
            if (waloff[globalpicnum] == 0) loadtile(globalpicnum);
            globalbufplc = waloff[globalpicnum];
            globalshade = max(min(sec->floorshade,numshades-1),0);
            globvis = globalhisibility;
            if (sec->visibility != 0) globvis = mulscale4(globvis, (uint8_t)(sec->visibility+16));
            globalpolytype = 0;
            if ((globalorientation&64) == 0)
            {
                globalposx = dax; globalx1 = bakgxvect; globaly1 = bakgyvect;
                globalposy = day; globalx2 = bakgxvect; globaly2 = bakgyvect;
            }
            else
            {
                ox = wall[wall[startwall].point2].x - wall[startwall].x;
                oy = wall[wall[startwall].point2].y - wall[startwall].y;
                i = nsqrtasm(uhypsq(ox,oy)); if (i == 0) continue;
                i = 1048576/i;
                globalx1 = mulscale10(dmulscale10(ox,bakgxvect,oy,bakgyvect),i);
                globaly1 = mulscale10(dmulscale10(ox,bakgyvect,-oy,bakgxvect),i);
                ox = (bakx1>>4)-(xdim<<7); oy = (baky1>>4)-(ydim<<7);
                globalposx = dmulscale28(-oy,globalx1,-ox,globaly1);
                globalposy = dmulscale28(-ox,globalx1,oy,globaly1);
                globalx2 = -globalx1;
                globaly2 = -globaly1;

                daslope = sector[s].floorheinum;
                i = nsqrtasm(daslope*daslope+16777216);
                globalposy = mulscale12(globalposy,i);
                globalx2 = mulscale12(globalx2,i);
                globaly2 = mulscale12(globaly2,i);
            }

            calc_globalshifts();

            sethlinesizes(picsiz[globalpicnum]&15,picsiz[globalpicnum]>>4,globalbufplc);

            if ((globalorientation&0x4) > 0)
            {
                i = globalposx; globalposx = -globalposy; globalposy = -i;
                i = globalx2; globalx2 = globaly1; globaly1 = i;
                i = globalx1; globalx1 = -globaly2; globaly2 = -i;
            }
            if ((globalorientation&0x10) > 0) globalx1 = -globalx1, globaly1 = -globaly1, globalposx = -globalposx;
            if ((globalorientation&0x20) > 0) globalx2 = -globalx2, globaly2 = -globaly2, globalposy = -globalposy;
            asm1 = (globaly1<<globalxshift);
            asm2 = (globalx2<<globalyshift);
            globalx1 <<= globalxshift;
            globaly2 <<= globalyshift;
            globalposx = ((int64_t)globalposx<<(20+globalxshift))+(((uint32_t)sec->floorxpanning)<<24);
            globalposy = ((int64_t)globalposy<<(20+globalyshift))-(((uint32_t)sec->floorypanning)<<24);

            fillpolygon(npoints);
        }

    //Sort sprite list
    gap = 1; while (gap < sortnum) gap = (gap<<1)+1;
    for (gap>>=1; gap>0; gap>>=1)
        for (i=0; i<sortnum-gap; i++)
            for (j=i; j>=0; j-=gap)
            {
                if (sprite[tsprite[j].owner].z <= sprite[tsprite[j+gap].owner].z) break;
                swapshort(&tsprite[j].owner,&tsprite[j+gap].owner);
            }

    for (s=sortnum-1; s>=0; s--)
    {
        spr = &sprite[tsprite[s].owner];
        if ((spr->cstat&48) == 32)
        {
            int32_t xspan;

            npoints = 0;

            x1 = spr->x;
            y1 = spr->y;
            get_floorspr_points(spr, 0, 0, &x1, &x2, &x3, &x4,
                               &y1, &y2, &y3, &y4);
            xspan = tilesizx[spr->picnum];

            xb1[0] = 1; xb1[1] = 2; xb1[2] = 3; xb1[3] = 0;
            npoints = 4;

            i = 0;

            ox = x1 - dax; oy = y1 - day;
            x = dmulscale16(ox,xvect,-oy,yvect) + (xdim<<11);
            y = dmulscale16(oy,xvect2,ox,yvect2) + (ydim<<11);
            i |= getclipmask(x-cx1,cx2-x,y-cy1,cy2-y);
            rx1[0] = x; ry1[0] = y;

            ox = x2 - dax; oy = y2 - day;
            x = dmulscale16(ox,xvect,-oy,yvect) + (xdim<<11);
            y = dmulscale16(oy,xvect2,ox,yvect2) + (ydim<<11);
            i |= getclipmask(x-cx1,cx2-x,y-cy1,cy2-y);
            rx1[1] = x; ry1[1] = y;

            ox = x3 - dax; oy = y3 - day;
            x = dmulscale16(ox,xvect,-oy,yvect) + (xdim<<11);
            y = dmulscale16(oy,xvect2,ox,yvect2) + (ydim<<11);
            i |= getclipmask(x-cx1,cx2-x,y-cy1,cy2-y);
            rx1[2] = x; ry1[2] = y;

            x = rx1[0]+rx1[2]-rx1[1];
            y = ry1[0]+ry1[2]-ry1[1];
            i |= getclipmask(x-cx1,cx2-x,y-cy1,cy2-y);
            rx1[3] = x; ry1[3] = y;

            if ((i&0xf0) != 0xf0) continue;
            bakx1 = rx1[0]; baky1 = mulscale16(ry1[0]-(ydim<<11),xyaspect)+(ydim<<11);
            if (i&0x0f)
            {
                npoints = clippoly(npoints,i);
                if (npoints < 3) continue;
            }

            globalpicnum = spr->picnum;
            globalpal = spr->pal; // GL needs this, software doesn't
            if ((unsigned)globalpicnum >= (unsigned)MAXTILES) globalpicnum = 0;
            setgotpic(globalpicnum);
            if ((tilesizx[globalpicnum] <= 0) || (tilesizy[globalpicnum] <= 0)) continue;
            DO_TILE_ANIM(globalpicnum, s);
            if (waloff[globalpicnum] == 0) loadtile(globalpicnum);
            globalbufplc = waloff[globalpicnum];

            // 'loading' the tile doesn't actually guarantee that it's there afterwards.
            // This can really happen when drawing the second frame of a floor-aligned
            // 'storm icon' sprite (4894+1)
            if (!globalbufplc)
                continue;

            if ((sector[spr->sectnum].ceilingstat&1) > 0)
                globalshade = ((int32_t)sector[spr->sectnum].ceilingshade);
            else
                globalshade = ((int32_t)sector[spr->sectnum].floorshade);
            globalshade = max(min(globalshade+spr->shade+6,numshades-1),0);
            asm3 = FP_OFF(palookup[spr->pal]+(globalshade<<8));
            globvis = globalhisibility;
            if (sec->visibility != 0) globvis = mulscale4(globvis, (uint8_t)(sec->visibility+16));
            globalpolytype = ((spr->cstat&2)>>1)+1;

            //relative alignment stuff
            ox = x2-x1; oy = y2-y1;
            i = ox*ox+oy*oy; if (i == 0) continue; i = (65536*16384)/i;
            globalx1 = mulscale10(dmulscale10(ox,bakgxvect,oy,bakgyvect),i);
            globaly1 = mulscale10(dmulscale10(ox,bakgyvect,-oy,bakgxvect),i);
            ox = y1-y4; oy = x4-x1;
            i = ox*ox+oy*oy; if (i == 0) continue; i = (65536*16384)/i;
            globalx2 = mulscale10(dmulscale10(ox,bakgxvect,oy,bakgyvect),i);
            globaly2 = mulscale10(dmulscale10(ox,bakgyvect,-oy,bakgxvect),i);

            ox = picsiz[globalpicnum]; oy = ((ox>>4)&15); ox &= 15;
            if (pow2long[ox] != xspan)
            {
                ox++;
                globalx1 = mulscale(globalx1,xspan,ox);
                globaly1 = mulscale(globaly1,xspan,ox);
            }

            bakx1 = (bakx1>>4)-(xdim<<7); baky1 = (baky1>>4)-(ydim<<7);
            globalposx = dmulscale28(-baky1,globalx1,-bakx1,globaly1);
            globalposy = dmulscale28(bakx1,globalx2,-baky1,globaly2);

            if ((spr->cstat&2) == 0)
                msethlineshift(ox,oy);
            else
            {
                if (spr->cstat&512) settransreverse(); else settransnormal();
                tsethlineshift(ox,oy);
            }

            if ((spr->cstat&0x4) > 0) globalx1 = -globalx1, globaly1 = -globaly1, globalposx = -globalposx;
            asm1 = (globaly1<<2); globalx1 <<= 2; globalposx <<= (20+2);
            asm2 = (globalx2<<2); globaly2 <<= 2; globalposy <<= (20+2);

            // so polymost can get the translucency. ignored in software mode:
            globalorientation = ((spr->cstat&2)<<7) | ((spr->cstat&512)>>2);
            fillpolygon(npoints);
        }
    }

    enddrawing();   //}}}

    if (r_usenewaspect)
        setaspect(oviewingrange, oyxaspect);
    else
        setaspect(65536, divscale16(ydim*320, xdim*200));
}


//////////////////// LOADING AND SAVING ROUTINES ////////////////////

static inline int32_t have_maptext(void)
{
    return (mapversion >= 10);
}

static void prepare_loadboard(int32_t fil, vec3_t *dapos, int16_t *daang, int16_t *dacursectnum)
{
    initspritelists();

    Bmemset(show2dsector, 0, sizeof(show2dsector));
    Bmemset(show2dsprite, 0, sizeof(show2dsprite));
    Bmemset(show2dwall, 0, sizeof(show2dwall));

    if (!have_maptext())
    {
        kread(fil,&dapos->x,4); dapos->x = B_LITTLE32(dapos->x);
        kread(fil,&dapos->y,4); dapos->y = B_LITTLE32(dapos->y);
        kread(fil,&dapos->z,4); dapos->z = B_LITTLE32(dapos->z);
        kread(fil,daang,2);  *daang  = B_LITTLE16(*daang) & 2047;
        kread(fil,dacursectnum,2); *dacursectnum = B_LITTLE16(*dacursectnum);
    }
}

static int32_t finish_loadboard(const vec3_t *dapos, int16_t *dacursectnum, int16_t numsprites, char myflags)
{
    int32_t i, realnumsprites=numsprites, numremoved;

#if !defined USE_OPENGL || !defined POLYMER
    UNREFERENCED_PARAMETER(myflags);
#endif

    for (i=0; i<numsprites; i++)
    {
        int32_t removeit = 0;

        if ((sprite[i].cstat & 48) == 48)
            sprite[i].cstat &= ~48;

        if (sprite[i].statnum == MAXSTATUS)
        {
            // Sprite was removed in loadboard() -> check_sprite(). Insert it
            // for now, because we must maintain the sprite numbering.
            sprite[i].statnum = sprite[i].sectnum = 0;
            removeit = 1;
        }

        insertsprite(sprite[i].sectnum, sprite[i].statnum);

        if (removeit)
        {
            // Flag .statnum==MAXSTATUS, temporarily creating an inconsistency
            // with sprite list.
            sprite[i].statnum = MAXSTATUS;
            realnumsprites--;
        }
    }

    if (numsprites != realnumsprites)
    {
        for (i=0; i<numsprites; i++)
            if (sprite[i].statnum == MAXSTATUS)
            {
                // Now remove it for real!
                sprite[i].statnum = 0;
                deletesprite(i);
            }
    }

    numremoved = (numsprites-realnumsprites);
    numsprites = realnumsprites;
    Bassert(numsprites == Numsprites);

    //Must be after loading sectors, etc!
    updatesector(dapos->x, dapos->y, dacursectnum);

#ifdef HAVE_CLIPSHAPE_FEATURE
    if (!quickloadboard)
#endif
    {
        Bmemset(spriteext, 0, sizeof(spriteext_t)*MAXSPRITES);

#ifdef USE_OPENGL
        Bmemset(spritesmooth, 0, sizeof(spritesmooth_t)*(MAXSPRITES+MAXUNIQHUDID));

# ifdef POLYMER
        if (getrendermode() == REND_POLYMER)
        {
            if ((myflags&4)==0)
                polymer_loadboard();
        }
# endif
#endif
    }

    guniqhudid = 0;

    return numremoved;
}


#define MYMAXSECTORS() (MAXSECTORS==MAXSECTORSV7 || mapversion <= 7 ? MAXSECTORSV7 : MAXSECTORSV8)
#define MYMAXWALLS()   (MAXSECTORS==MAXSECTORSV7 || mapversion <= 7 ? MAXWALLSV7 : MAXWALLSV8)
#define MYMAXSPRITES() (MAXSECTORS==MAXSECTORSV7 || mapversion <= 7 ? MAXSPRITESV7 : MAXSPRITESV8)

// Sprite checking

static void remove_sprite(int32_t i)
{
    Bmemset(&sprite[i], 0, sizeof(spritetype));
    sprite[i].statnum = MAXSTATUS;
    sprite[i].sectnum = MAXSECTORS;
}

// This is only to be run after reading the sprite array!
static void check_sprite(int32_t i)
{
    if ((unsigned)sprite[i].statnum >= MAXSTATUS)
    {
        initprintf_nowarn(OSD_ERROR "Map error: sprite #%d (%d,%d) with illegal statnum (%d) REMOVED.\n",
                   i, TrackerCast(sprite[i].x), TrackerCast(sprite[i].y), TrackerCast(sprite[i].statnum));
        remove_sprite(i);
    }
    else if ((unsigned)sprite[i].picnum >= MAXTILES)
    {
        initprintf_nowarn(OSD_ERROR "Map error: sprite #%d (%d,%d) with illegal picnum (%d) REMOVED.\n",
                   i, TrackerCast(sprite[i].x), TrackerCast(sprite[i].y), TrackerCast(sprite[i].sectnum));
        remove_sprite(i);
    }
    else if ((unsigned)sprite[i].sectnum >= (unsigned)numsectors)
    {
        const int32_t osectnum = sprite[i].sectnum;

        sprite[i].sectnum = -1;
        updatesector(sprite[i].x, sprite[i].y, &sprite[i].sectnum);

        if (sprite[i].sectnum < 0)
            remove_sprite(i);

        initprintf_nowarn(OSD_ERROR "Map error: sprite #%d (%d,%d) with illegal sector (%d) ",
                   i, TrackerCast(sprite[i].x), TrackerCast(sprite[i].y), osectnum);

        if (sprite[i].statnum != MAXSTATUS)
            initprintf_nowarn("changed to sector %d.\n", TrackerCast(sprite[i].sectnum));
        else
            initprintf_nowarn("REMOVED.\n");
    }
}

#ifdef NEW_MAP_FORMAT
// Returns the number of sprites, or <0 on error.
LUNATIC_CB int32_t (*loadboard_maptext)(int32_t fil, vec3_t *dapos, int16_t *daang, int16_t *dacursectnum);
#endif

// flags: 1, 2: former parameter "fromwhere"
//           4: don't call polymer_loadboard
// returns: -1: file not found
//          -2: invalid version
//          -3: invalid number of sectors, walls or sprites
//       <= -4: map-text error
int32_t loadboard(const char *filename, char flags, vec3_t *dapos, int16_t *daang, int16_t *dacursectnum)
{
    int32_t fil, i;
    int16_t numsprites;
    const char myflags = flags&(~3);

    flags &= 3;

    if ((fil = kopen4load(filename,flags)) == -1)
        { mapversion = 7; return -1; }

    if (kread(fil, &mapversion, 4) != 4)
        return -2;

    {
        int32_t ok = 0;

#ifdef NEW_MAP_FORMAT
        // Check for map-text first.
        if (!Bmemcmp(&mapversion, "--ED", 4))
        {
            mapversion = 10;
            ok = 1;
        }
        else
#endif
        {
            // Not map-text. We expect a little-endian version int now.
            mapversion = B_LITTLE32(mapversion);
#ifdef YAX_ENABLE
            ok |= (mapversion==9);
#endif
#if MAXSECTORS==MAXSECTORSV8
            // v8 engine
            ok |= (mapversion==8);
#endif
            ok |= (mapversion==7);
        }

        if (!ok)
        {
            kclose(fil);
            return -2;
        }
    }

    prepare_loadboard(fil, dapos, daang, dacursectnum);

#ifdef NEW_MAP_FORMAT
    if (have_maptext())
    {
        int32_t ret = klseek(fil, 0, SEEK_SET);

        if (ret == 0)
            ret = loadboard_maptext(fil, dapos, daang, dacursectnum);

        if (ret < 0)
        {
            kclose(fil);
            return ret;
        }

        numsprites = ret;
        goto skip_reading_mapbin;
    }
#endif

    ////////// Read sectors //////////

    kread(fil,&numsectors,2); numsectors = B_LITTLE16(numsectors);
    if ((unsigned)numsectors >= MYMAXSECTORS()+1) { kclose(fil); return -3; }

    kread(fil, sector, sizeof(sectortypev7)*numsectors);

    for (i=numsectors-1; i>=0; i--)
    {
#ifdef NEW_MAP_FORMAT
        Bmemmove(&sector[i], &(((sectortypev7 *)sector)[i]), sizeof(sectortypevx));
        inplace_vx_from_v7_sector(&sector[i]);
#endif
        sector[i].wallptr       = B_LITTLE16(sector[i].wallptr);
        sector[i].wallnum       = B_LITTLE16(sector[i].wallnum);
        sector[i].ceilingz      = B_LITTLE32(sector[i].ceilingz);
        sector[i].floorz        = B_LITTLE32(sector[i].floorz);
        sector[i].ceilingstat   = B_LITTLE16(sector[i].ceilingstat);
        sector[i].floorstat     = B_LITTLE16(sector[i].floorstat);
        sector[i].ceilingpicnum = B_LITTLE16(sector[i].ceilingpicnum);
        sector[i].ceilingheinum = B_LITTLE16(sector[i].ceilingheinum);
        sector[i].floorpicnum   = B_LITTLE16(sector[i].floorpicnum);
        sector[i].floorheinum   = B_LITTLE16(sector[i].floorheinum);
        sector[i].lotag         = B_LITTLE16(sector[i].lotag);
        sector[i].hitag         = B_LITTLE16(sector[i].hitag);
        sector[i].extra         = B_LITTLE16(sector[i].extra);
#ifdef NEW_MAP_FORMAT
        inplace_vx_tweak_sector(&sector[i], mapversion==9);
#endif
    }


    ////////// Read walls //////////

    kread(fil,&numwalls,2); numwalls = B_LITTLE16(numwalls);
    if ((unsigned)numwalls >= MYMAXWALLS()+1) { kclose(fil); return -3; }

    kread(fil, wall, sizeof(walltypev7)*numwalls);

    for (i=numwalls-1; i>=0; i--)
    {
#ifdef NEW_MAP_FORMAT
        Bmemmove(&wall[i], &(((walltypev7 *)wall)[i]), sizeof(walltypevx));
        inplace_vx_from_v7_wall(&wall[i]);
#endif
        wall[i].x          = B_LITTLE32(wall[i].x);
        wall[i].y          = B_LITTLE32(wall[i].y);
        wall[i].point2     = B_LITTLE16(wall[i].point2);
        wall[i].nextwall   = B_LITTLE16(wall[i].nextwall);
        wall[i].nextsector = B_LITTLE16(wall[i].nextsector);
        wall[i].cstat      = B_LITTLE16(wall[i].cstat);
        wall[i].picnum     = B_LITTLE16(wall[i].picnum);
        wall[i].overpicnum = B_LITTLE16(wall[i].overpicnum);
        wall[i].lotag      = B_LITTLE16(wall[i].lotag);
        wall[i].hitag      = B_LITTLE16(wall[i].hitag);
        wall[i].extra      = B_LITTLE16(wall[i].extra);
#ifdef NEW_MAP_FORMAT
        inplace_vx_tweak_wall(&wall[i], mapversion==9);
#endif
    }


    ////////// Read sprites //////////

    kread(fil,&numsprites,2); numsprites = B_LITTLE16(numsprites);
    if ((unsigned)numsprites >= MYMAXSPRITES()+1) { kclose(fil); return -3; }

    kread(fil, sprite, sizeof(spritetype)*numsprites);

#ifdef NEW_MAP_FORMAT
skip_reading_mapbin:
#endif
    kclose(fil);
    // Done reading file.

    for (i=numsprites-1; i>=0; i--)
    {
        if (!have_maptext())
        {
            sprite[i].x       = B_LITTLE32(sprite[i].x);
            sprite[i].y       = B_LITTLE32(sprite[i].y);
            sprite[i].z       = B_LITTLE32(sprite[i].z);
            sprite[i].cstat   = B_LITTLE16(sprite[i].cstat);
            sprite[i].picnum  = B_LITTLE16(sprite[i].picnum);
            sprite[i].sectnum = B_LITTLE16(sprite[i].sectnum);
            sprite[i].statnum = B_LITTLE16(sprite[i].statnum);
            sprite[i].ang     = B_LITTLE16(sprite[i].ang);
            sprite[i].owner   = B_LITTLE16(sprite[i].owner);
            sprite[i].xvel    = B_LITTLE16(sprite[i].xvel);
            sprite[i].yvel    = B_LITTLE16(sprite[i].yvel);
            sprite[i].zvel    = B_LITTLE16(sprite[i].zvel);
            sprite[i].lotag   = B_LITTLE16(sprite[i].lotag);
            sprite[i].hitag   = B_LITTLE16(sprite[i].hitag);
            sprite[i].extra   = B_LITTLE16(sprite[i].extra);
        }

        check_sprite(i);
    }

    // Back up the map version of the *loaded* map. Must be before yax_update().
    g_loadedMapVersion = mapversion;
#ifdef YAX_ENABLE
    yax_update(mapversion<9);
    if (editstatus)
        yax_updategrays(dapos->z);
#endif

    {
        char fn[BMAX_PATH];

        Bstrcpy(fn, filename);
        append_ext_UNSAFE(fn, ".cfg");

        OSD_Exec(fn);

        system_getcvars();
    }

    return finish_loadboard(dapos, dacursectnum, numsprites, myflags);
}


//
// loadboardv5/6
//
#include "engine_oldmap.h"

// Powerslave uses v6
// Witchaven 1 and TekWar and LameDuke use v5
int32_t loadoldboard(const char *filename, char fromwhere, vec3_t *dapos, int16_t *daang, int16_t *dacursectnum)
{
    int32_t fil, i;
    int16_t numsprites;

    struct sectortypev5 v5sect;
    struct walltypev5   v5wall;
    struct spritetypev5 v5spr;
    struct sectortypev6 v6sect;
    struct walltypev6   v6wall;
    struct spritetypev6 v6spr;

    if ((fil = kopen4load(filename,fromwhere)) == -1)
        { mapversion = 5L; return(-1); }

    kread(fil,&mapversion,4); mapversion = B_LITTLE32(mapversion);
    if (mapversion != 5L && mapversion != 6L) { kclose(fil); return(-2); }

    prepare_loadboard(fil, dapos, daang, dacursectnum);

    kread(fil,&numsectors,2); numsectors = B_LITTLE16(numsectors);
    if (numsectors > MAXSECTORS) { kclose(fil); return(-1); }
    for (i=0; i<numsectors; i++)
    {
        switch (mapversion)
        {
        case 5:
            kread(fil,&v5sect,sizeof(struct sectortypev5));
            v5sect.wallptr = B_LITTLE16(v5sect.wallptr);
            v5sect.wallnum = B_LITTLE16(v5sect.wallnum);
            v5sect.ceilingpicnum = B_LITTLE16(v5sect.ceilingpicnum);
            v5sect.floorpicnum = B_LITTLE16(v5sect.floorpicnum);
            v5sect.ceilingheinum = B_LITTLE16(v5sect.ceilingheinum);
            v5sect.floorheinum = B_LITTLE16(v5sect.floorheinum);
            v5sect.ceilingz = B_LITTLE32(v5sect.ceilingz);
            v5sect.floorz = B_LITTLE32(v5sect.floorz);
            v5sect.lotag = B_LITTLE16(v5sect.lotag);
            v5sect.hitag = B_LITTLE16(v5sect.hitag);
            v5sect.extra = B_LITTLE16(v5sect.extra);
            break;
        case 6:
            kread(fil,&v6sect,sizeof(struct sectortypev6));
            v6sect.wallptr = B_LITTLE16(v6sect.wallptr);
            v6sect.wallnum = B_LITTLE16(v6sect.wallnum);
            v6sect.ceilingpicnum = B_LITTLE16(v6sect.ceilingpicnum);
            v6sect.floorpicnum = B_LITTLE16(v6sect.floorpicnum);
            v6sect.ceilingheinum = B_LITTLE16(v6sect.ceilingheinum);
            v6sect.floorheinum = B_LITTLE16(v6sect.floorheinum);
            v6sect.ceilingz = B_LITTLE32(v6sect.ceilingz);
            v6sect.floorz = B_LITTLE32(v6sect.floorz);
            v6sect.lotag = B_LITTLE16(v6sect.lotag);
            v6sect.hitag = B_LITTLE16(v6sect.hitag);
            v6sect.extra = B_LITTLE16(v6sect.extra);
            break;
        }

        switch (mapversion)
        {
        case 5:
            convertv5sectv6(&v5sect,&v6sect);
        case 6:
            convertv6sectv7(&v6sect,&sector[i]);
        }
    }

    kread(fil,&numwalls,2); numwalls = B_LITTLE16(numwalls);
    if (numwalls > MAXWALLS) { kclose(fil); return(-1); }
    for (i=0; i<numwalls; i++)
    {
        switch (mapversion)
        {
        case 5:
            kread(fil,&v5wall,sizeof(struct walltypev5));
            v5wall.x = B_LITTLE32(v5wall.x);
            v5wall.y = B_LITTLE32(v5wall.y);
            v5wall.point2 = B_LITTLE16(v5wall.point2);
            v5wall.picnum = B_LITTLE16(v5wall.picnum);
            v5wall.overpicnum = B_LITTLE16(v5wall.overpicnum);
            v5wall.cstat = B_LITTLE16(v5wall.cstat);
            v5wall.nextsector1 = B_LITTLE16(v5wall.nextsector1);
            v5wall.nextwall1 = B_LITTLE16(v5wall.nextwall1);
            v5wall.nextsector2 = B_LITTLE16(v5wall.nextsector2);
            v5wall.nextwall2 = B_LITTLE16(v5wall.nextwall2);
            v5wall.lotag = B_LITTLE16(v5wall.lotag);
            v5wall.hitag = B_LITTLE16(v5wall.hitag);
            v5wall.extra = B_LITTLE16(v5wall.extra);
            break;
        case 6:
            kread(fil,&v6wall,sizeof(struct walltypev6));
            v6wall.x = B_LITTLE32(v6wall.x);
            v6wall.y = B_LITTLE32(v6wall.y);
            v6wall.point2 = B_LITTLE16(v6wall.point2);
            v6wall.nextsector = B_LITTLE16(v6wall.nextsector);
            v6wall.nextwall = B_LITTLE16(v6wall.nextwall);
            v6wall.picnum = B_LITTLE16(v6wall.picnum);
            v6wall.overpicnum = B_LITTLE16(v6wall.overpicnum);
            v6wall.cstat = B_LITTLE16(v6wall.cstat);
            v6wall.lotag = B_LITTLE16(v6wall.lotag);
            v6wall.hitag = B_LITTLE16(v6wall.hitag);
            v6wall.extra = B_LITTLE16(v6wall.extra);
            break;
        }

        switch (mapversion)
        {
        case 5:
            convertv5wallv6(&v5wall,&v6wall,i);
        case 6:
            convertv6wallv7(&v6wall,&wall[i]);
        }
    }

    kread(fil,&numsprites,2); numsprites = B_LITTLE16(numsprites);
    if (numsprites > MAXSPRITES) { kclose(fil); return(-1); }
    for (i=0; i<numsprites; i++)
    {
        switch (mapversion)
        {
        case 5:
            kread(fil,&v5spr,sizeof(struct spritetypev5));
            v5spr.x = B_LITTLE32(v5spr.x);
            v5spr.y = B_LITTLE32(v5spr.y);
            v5spr.z = B_LITTLE32(v5spr.z);
            v5spr.picnum = B_LITTLE16(v5spr.picnum);
            v5spr.ang = B_LITTLE16(v5spr.ang);
            v5spr.xvel = B_LITTLE16(v5spr.xvel);
            v5spr.yvel = B_LITTLE16(v5spr.yvel);
            v5spr.zvel = B_LITTLE16(v5spr.zvel);
            v5spr.owner = B_LITTLE16(v5spr.owner);
            v5spr.sectnum = B_LITTLE16(v5spr.sectnum);
            v5spr.statnum = B_LITTLE16(v5spr.statnum);
            v5spr.lotag = B_LITTLE16(v5spr.lotag);
            v5spr.hitag = B_LITTLE16(v5spr.hitag);
            v5spr.extra = B_LITTLE16(v5spr.extra);
            break;
        case 6:
            kread(fil,&v6spr,sizeof(struct spritetypev6));
            v6spr.x = B_LITTLE32(v6spr.x);
            v6spr.y = B_LITTLE32(v6spr.y);
            v6spr.z = B_LITTLE32(v6spr.z);
            v6spr.cstat = B_LITTLE16(v6spr.cstat);
            v6spr.picnum = B_LITTLE16(v6spr.picnum);
            v6spr.ang = B_LITTLE16(v6spr.ang);
            v6spr.xvel = B_LITTLE16(v6spr.xvel);
            v6spr.yvel = B_LITTLE16(v6spr.yvel);
            v6spr.zvel = B_LITTLE16(v6spr.zvel);
            v6spr.owner = B_LITTLE16(v6spr.owner);
            v6spr.sectnum = B_LITTLE16(v6spr.sectnum);
            v6spr.statnum = B_LITTLE16(v6spr.statnum);
            v6spr.lotag = B_LITTLE16(v6spr.lotag);
            v6spr.hitag = B_LITTLE16(v6spr.hitag);
            v6spr.extra = B_LITTLE16(v6spr.extra);
            break;
        }

        switch (mapversion)
        {
        case 5:
            convertv5sprv6(&v5spr,&v6spr);
        case 6:
            convertv6sprv7(&v6spr,&sprite[i]);
        }

        check_sprite(i);
    }

    kclose(fil);
    // Done reading file.

    return finish_loadboard(dapos, dacursectnum, numsprites, 0);
}


#ifdef POLYMER
void delete_maphack_lights()
{
    int32_t i;
    for (i=0; i<maphacklightcnt; i++)
    {
        if (maphacklight[i] >= 0)
            polymer_deletelight(maphacklight[i]);
        maphacklight[i] = -1;
    }

    maphacklightcnt = 0;
}
#else
void delete_maphack_lights() {}
#endif

//
// loadmaphack
//
int32_t loadmaphack(const char *filename)
{
#ifdef USE_OPENGL
    enum
    {
        T_SPRITE = 0,
        T_ANGOFF,
        T_NOMODEL,
        T_NOANIM,
        T_PITCH,
        T_ROLL,
        T_MDXOFF,
        T_MDYOFF,
        T_MDZOFF,
        T_AWAY1,
        T_AWAY2,
        T_LIGHT,
    };

    static struct { const char *text; int32_t tokenid; } legaltokens[] =
    {
        { "sprite", T_SPRITE },
        { "angleoff", T_ANGOFF },
        { "angoff", T_ANGOFF },
        { "notmd2", T_NOMODEL },
        { "notmd3", T_NOMODEL },
        { "notmd", T_NOMODEL },
        { "nomd2anim", T_NOANIM },
        { "nomd3anim", T_NOANIM },
        { "nomdanim", T_NOANIM },
        { "pitch", T_PITCH },
        { "roll", T_ROLL },
        { "mdxoff", T_MDXOFF },
        { "mdyoff", T_MDYOFF },
        { "mdzoff", T_MDZOFF },
        { "away1", T_AWAY1 },
        { "away2", T_AWAY2 },
        { "light", T_LIGHT },
        { NULL, -1 }
    };

    scriptfile *script = NULL;
    char *tok, *cmdtokptr;
    int32_t i;
    int32_t whichsprite = -1;
    static char fn[BMAX_PATH];

#ifdef POLYMER
    int32_t toomanylights = 0;

    delete_maphack_lights();
#endif

    if (filename)
    {
        Bmemset(spriteext, 0, sizeof(spriteext_t) * MAXSPRITES);
        Bmemset(spritesmooth, 0, sizeof(spritesmooth_t) *(MAXSPRITES+MAXUNIQHUDID));
        Bstrcpy(fn, filename);
        script = scriptfile_fromfile(filename);
    }
    else if (fn[0])
    {
        // re-load
        script = scriptfile_fromfile(fn);
    }

    if (!script)
    {
        fn[0] = 0;
        return -1;
    }

    while (1)
    {
        tok = scriptfile_gettoken(script);
        if (!tok) break;
        for (i=0; legaltokens[i].text; i++) if (!Bstrcasecmp(tok,legaltokens[i].text)) break;
        cmdtokptr = script->ltextptr;

        if (!filename && legaltokens[i].tokenid != T_LIGHT) continue;

        switch (legaltokens[i].tokenid)
        {
        case T_SPRITE:     // sprite <xx>
            if (scriptfile_getnumber(script, &whichsprite)) break;

            if ((unsigned)whichsprite >= (unsigned)MAXSPRITES)
            {
                // sprite number out of range
                initprintf("Sprite number out of range 0-%d on line %s:%d\n",
                           MAXSPRITES-1,script->filename, scriptfile_getlinum(script,cmdtokptr));
                whichsprite = -1;
                break;
            }

            break;
        case T_ANGOFF:     // angoff <xx>
        {
            int32_t ang;
            if (scriptfile_getnumber(script, &ang)) break;

            if (whichsprite < 0)
            {
                // no sprite directive preceeding
                initprintf("Ignoring angle offset directive because of absent/invalid sprite number on line %s:%d\n",
                           script->filename, scriptfile_getlinum(script,cmdtokptr));
                break;
            }
            spriteext[whichsprite].angoff = (int16_t)ang;
        }
        break;
        case T_NOMODEL:      // notmd
            if (whichsprite < 0)
            {
                // no sprite directive preceeding
                initprintf("Ignoring not-MD2/MD3 directive because of absent/invalid sprite number on line %s:%d\n",
                           script->filename, scriptfile_getlinum(script,cmdtokptr));
                break;
            }
            spriteext[whichsprite].flags |= SPREXT_NOTMD;
            break;
        case T_NOANIM:      // nomdanim
            if (whichsprite < 0)
            {
                // no sprite directive preceeding
                initprintf("Ignoring no-MD2/MD3-anim directive because of absent/invalid sprite number on line %s:%d\n",
                           script->filename, scriptfile_getlinum(script,cmdtokptr));
                break;
            }
            spriteext[whichsprite].flags |= SPREXT_NOMDANIM;
            break;
        case T_PITCH:     // pitch <xx>
        {
            int32_t pitch;
            if (scriptfile_getnumber(script, &pitch)) break;

            if (whichsprite < 0)
            {
                // no sprite directive preceeding
                initprintf("Ignoring pitch directive because of absent/invalid sprite number on line %s:%d\n",
                           script->filename, scriptfile_getlinum(script,cmdtokptr));
                break;
            }
            spriteext[whichsprite].pitch = (int16_t)pitch;
        }
        break;
        case T_ROLL:     // roll <xx>
        {
            int32_t roll;
            if (scriptfile_getnumber(script, &roll)) break;

            if (whichsprite < 0)
            {
                // no sprite directive preceeding
                initprintf("Ignoring roll directive because of absent/invalid sprite number on line %s:%d\n",
                           script->filename, scriptfile_getlinum(script,cmdtokptr));
                break;
            }
            spriteext[whichsprite].roll = (int16_t)roll;
        }
        break;
        case T_MDXOFF:     // mdxoff <xx>
        {
            int32_t i;
            if (scriptfile_getnumber(script, &i)) break;

            if (whichsprite < 0)
            {
                // no sprite directive preceeding
                initprintf("Ignoring mdxoff directive because of absent/invalid sprite number on line %s:%d\n",
                           script->filename, scriptfile_getlinum(script,cmdtokptr));
                break;
            }
            spriteext[whichsprite].xoff = i;
        }
        break;
        case T_MDYOFF:     // mdyoff <xx>
        {
            int32_t i;
            if (scriptfile_getnumber(script, &i)) break;

            if (whichsprite < 0)
            {
                // no sprite directive preceeding
                initprintf("Ignoring mdyoff directive because of absent/invalid sprite number on line %s:%d\n",
                           script->filename, scriptfile_getlinum(script,cmdtokptr));
                break;
            }
            spriteext[whichsprite].yoff = i;
        }
        break;
        case T_MDZOFF:     // mdzoff <xx>
        {
            int32_t i;
            if (scriptfile_getnumber(script, &i)) break;

            if (whichsprite < 0)
            {
                // no sprite directive preceeding
                initprintf("Ignoring mdzoff directive because of absent/invalid sprite number on line %s:%d\n",
                           script->filename, scriptfile_getlinum(script,cmdtokptr));
                break;
            }
            spriteext[whichsprite].zoff = i;
        }
        break;
        case T_AWAY1:      // away1
            if (whichsprite < 0)
            {
                // no sprite directive preceeding
                initprintf("Ignoring moving away directive because of absent/invalid sprite number on line %s:%d\n",
                           script->filename, scriptfile_getlinum(script,cmdtokptr));
                break;
            }
            spriteext[whichsprite].flags |= SPREXT_AWAY1;
            break;
        case T_AWAY2:      // away2
            if (whichsprite < 0)
            {
                // no sprite directive preceeding
                initprintf("Ignoring moving away directive because of absent/invalid sprite number on line %s:%d\n",
                           script->filename, scriptfile_getlinum(script,cmdtokptr));
                break;
            }
            spriteext[whichsprite].flags |= SPREXT_AWAY2;
            break;
#ifdef POLYMER
        case T_LIGHT:      // light sector x y z range r g b radius faderadius angle horiz minshade maxshade priority tilenum
        {
            int32_t value;
            int16_t lightid;
#pragma pack(push,1)
            _prlight light;
#pragma pack(pop)
            if (toomanylights)
                break;  // ignore further light defs

            scriptfile_getnumber(script, &value);
            light.sector = value;
            scriptfile_getnumber(script, &value);
            light.x = value;
            scriptfile_getnumber(script, &value);
            light.y = value;
            scriptfile_getnumber(script, &value);
            light.z = value;
            scriptfile_getnumber(script, &value);
            light.range = value;
            scriptfile_getnumber(script, &value);
            light.color[0] = value;
            scriptfile_getnumber(script, &value);
            light.color[1] = value;
            scriptfile_getnumber(script, &value);
            light.color[2] = value;
            scriptfile_getnumber(script, &value);
            light.radius = value;
            scriptfile_getnumber(script, &value);
            light.faderadius = value;
            scriptfile_getnumber(script, &value);
            light.angle = value;
            scriptfile_getnumber(script, &value);
            light.horiz = value;
            scriptfile_getnumber(script, &value);
            light.minshade = value;
            scriptfile_getnumber(script, &value);
            light.maxshade = value;
            scriptfile_getnumber(script, &value);
            light.priority = value;
            scriptfile_getnumber(script, &value);
            light.tilenum = value;

            light.publicflags.emitshadow = 1;
            light.publicflags.negative = 0;

            if (getrendermode() == REND_POLYMER)
            {
                if (maphacklightcnt == PR_MAXLIGHTS)
                {
                    initprintf("warning: max light count %d exceeded, "
                               "ignoring further light defs\n", PR_MAXLIGHTS);
                    toomanylights = 1;
                    break;
                }

                lightid = polymer_addlight(&light);
                if (lightid>=0)
                    maphacklight[maphacklightcnt++] = lightid;
            }

            break;
        }
#endif // POLYMER

        default:
            // unrecognised token
            break;
        }
    }

    scriptfile_close(script);
    return 0;
#else
    UNREFERENCED_PARAMETER(filename);
    return -1;
#endif
}


#ifdef NEW_MAP_FORMAT
LUNATIC_CB int32_t (*saveboard_maptext)(const char *filename, const vec3_t *dapos, int16_t daang, int16_t dacursectnum);
#endif

// Get map version of binary map format (< map-int VX).
static int32_t get_mapversion(void)
{
#ifdef YAX_ENABLE
    if (numyaxbunches > 0)
        return 9;
    else
#endif
    if (numsectors > MAXSECTORSV7 || numwalls > MAXWALLSV7 || Numsprites > MAXSPRITESV7)
        return 8;

    return 7;
}

//
// saveboard
//
int32_t saveboard(const char *filename, const vec3_t *dapos, int16_t daang, int16_t dacursectnum)
{
    int16_t numsprites, ts;
    int32_t i, j, fil, tl;

    // First, some checking.
    for (j=0; j<MAXSPRITES; j++)
    {
        if ((unsigned)sprite[j].statnum > MAXSTATUS)
        {
            initprintf_nowarn("Map error: sprite #%d(%d,%d) with an illegal statnum(%d)\n",
                       j,TrackerCast(sprite[j].x),TrackerCast(sprite[j].y),TrackerCast(sprite[j].statnum));
            changespritestat(j,0);
        }

        if ((unsigned)sprite[j].sectnum > MAXSECTORS)
        {
            initprintf_nowarn("Map error: sprite #%d(%d,%d) with an illegal sectnum(%d)\n",
                       j,TrackerCast(sprite[j].x),TrackerCast(sprite[j].y),TrackerCast(sprite[j].sectnum));
            changespritesect(j,0);
        }
    }

    // Count the number of sprites.
    numsprites = 0;
    for (j=0; j<MAXSPRITES; j++)
    {
        if (sprite[j].statnum != MAXSTATUS)
            numsprites++;
    }

    // Check consistency of sprite-in-the-world predicate (.statnum != MAXSTATUS)
    // and the engine-reported number of sprites 'Numsprites'.
    Bassert(numsprites == Numsprites);

#ifdef NEW_MAP_FORMAT
    if (numyaxbunches > 0)
        return saveboard_maptext(filename, dapos, daang, dacursectnum);
#endif

    fil = Bopen(filename, BO_BINARY|BO_TRUNC|BO_CREAT|BO_WRONLY, BS_IREAD|BS_IWRITE);

    if (fil == -1)
    {
        initprintf("Couldn't open \"%s\" for writing: %s\n", filename, strerror(errno));
        return -1;
    }

    // Determine the map version.
    mapversion = get_mapversion();
    tl = B_LITTLE32(mapversion);    Bwrite(fil,&tl,4);

    tl = B_LITTLE32(dapos->x);      Bwrite(fil,&tl,4);
    tl = B_LITTLE32(dapos->y);      Bwrite(fil,&tl,4);
    tl = B_LITTLE32(dapos->z);      Bwrite(fil,&tl,4);
    ts = B_LITTLE16(daang);        Bwrite(fil,&ts,2);
    ts = B_LITTLE16(dacursectnum); Bwrite(fil,&ts,2);

    ts = B_LITTLE16(numsectors);    Bwrite(fil,&ts,2);

    while (1)  // if, really
    {
        sectortypev7 *const tsect = (sectortypev7 *)Bmalloc(sizeof(sectortypev7) * numsectors);
        walltypev7 *twall;

        if (tsect == NULL)
            break;

#ifdef NEW_MAP_FORMAT
        for (i=0; i<numsectors; i++)
            copy_v7_from_vx_sector(&tsect[i], &sector[i]);
#else
        Bmemcpy(tsect, sector, sizeof(sectortypev7)*numsectors);
#endif

        for (i=0; i<numsectors; i++)
        {
            sectortypev7 *const sec = &tsect[i];

            sec->wallptr       = B_LITTLE16(sec->wallptr);
            sec->wallnum       = B_LITTLE16(sec->wallnum);
            sec->ceilingz      = B_LITTLE32(sec->ceilingz);
            sec->floorz        = B_LITTLE32(sec->floorz);
            sec->ceilingstat   = B_LITTLE16(sec->ceilingstat);
            sec->floorstat     = B_LITTLE16(sec->floorstat);
            sec->ceilingpicnum = B_LITTLE16(sec->ceilingpicnum);
            sec->ceilingheinum = B_LITTLE16(sec->ceilingheinum);
            sec->floorpicnum   = B_LITTLE16(sec->floorpicnum);
            sec->floorheinum   = B_LITTLE16(sec->floorheinum);
            sec->lotag         = B_LITTLE16(sec->lotag);
            sec->hitag         = B_LITTLE16(sec->hitag);
            sec->extra         = B_LITTLE16(sec->extra);
#ifdef YAX_ENABLE__COMPAT
            if (editstatus == 0)
            {
                // if in-game, pack game-time bunchnum data back into structs
                int32_t cf, bn;

                for (cf=0; cf<2; cf++)
                    if ((bn=yax_getbunch(i, cf)) >= 0)
                        YAX_PTRBUNCHNUM(tsect, i, cf) = bn;
            }
#endif
        }

        Bwrite(fil, tsect, sizeof(sectortypev7)*numsectors);
        Bfree(tsect);

        ts = B_LITTLE16(numwalls);
        Bwrite(fil,&ts,2);

        twall = (walltypev7 *)Bmalloc(sizeof(walltypev7) * numwalls);

        if (twall == NULL)
            break;

#ifdef NEW_MAP_FORMAT
        for (i=0; i<numwalls; i++)
            copy_v7_from_vx_wall(&twall[i], &wall[i]);
#else
        Bmemcpy(twall, wall, sizeof(walltypev7)*numwalls);
#endif

        for (i=0; i<numwalls; i++)
        {
            walltypev7 *const wal = &twall[i];

            wal->x          = B_LITTLE32(wal->x);
            wal->y          = B_LITTLE32(wal->y);
            wal->point2     = B_LITTLE16(wal->point2);
            wal->nextwall   = B_LITTLE16(wal->nextwall);
            wal->nextsector = B_LITTLE16(wal->nextsector);
            wal->cstat      = B_LITTLE16(wal->cstat);
            wal->picnum     = B_LITTLE16(wal->picnum);
            wal->overpicnum = B_LITTLE16(wal->overpicnum);
#ifdef YAX_ENABLE__COMPAT
            if (editstatus == 0)
            {
                // if in-game, pack game-time yax-nextwall data back into structs
                int16_t ynw;
                if ((ynw=yax_getnextwall(i, YAX_CEILING))>=0)
                    YAX_PTRNEXTWALL(twall,i,YAX_CEILING) = ynw;
                if ((ynw=yax_getnextwall(i, YAX_FLOOR))>=0)
                    YAX_PTRNEXTWALL(twall,i,YAX_FLOOR) = ynw;
            }
#endif
            wal->lotag      = B_LITTLE16(wal->lotag);
            wal->hitag      = B_LITTLE16(wal->hitag);
            wal->extra      = B_LITTLE16(wal->extra);
        }

        Bwrite(fil, twall, sizeof(walltypev7)*numwalls);
        Bfree(twall);

        ts = B_LITTLE16(numsprites);    Bwrite(fil,&ts,2);

        if (numsprites > 0)
        {
            spritetype *const tspri = (spritetype *)Bmalloc(sizeof(spritetype) * numsprites);
            spritetype *spri = tspri;

            if (tspri == NULL)
                break;

            for (j=0; j<MAXSPRITES; j++)
            {
                if (sprite[j].statnum != MAXSTATUS)
                {
                    Bmemcpy(spri, &sprite[j], sizeof(spritetype));
                    spri->x       = B_LITTLE32(spri->x);
                    spri->y       = B_LITTLE32(spri->y);
                    spri->z       = B_LITTLE32(spri->z);
                    spri->cstat   = B_LITTLE16(spri->cstat);
                    spri->picnum  = B_LITTLE16(spri->picnum);
                    spri->sectnum = B_LITTLE16(spri->sectnum);
                    spri->statnum = B_LITTLE16(spri->statnum);
                    spri->ang     = B_LITTLE16(spri->ang);
                    spri->owner   = B_LITTLE16(spri->owner);
                    spri->xvel    = B_LITTLE16(spri->xvel);
                    spri->yvel    = B_LITTLE16(spri->yvel);
                    spri->zvel    = B_LITTLE16(spri->zvel);
                    spri->lotag   = B_LITTLE16(spri->lotag);
                    spri->hitag   = B_LITTLE16(spri->hitag);
                    spri->extra   = B_LITTLE16(spri->extra);
                    spri++;
                }
            }

            Bwrite(fil, tspri, sizeof(spritetype)*numsprites);
            Bfree(tspri);
        }

        Bclose(fil);
        return 0;
    }

    Bclose(fil);
    return -1;
}


//
// setgamemode
//
// JBF: davidoption now functions as a windowed-mode flag (0 == windowed, 1 == fullscreen)
extern char videomodereset;
int32_t setgamemode(char davidoption, int32_t daxdim, int32_t daydim, int32_t dabpp)
{
    int32_t j;

#ifdef USE_OPENGL
    extern char nogl;

    if (nogl) dabpp = 8;
#endif
    daxdim = max(320, daxdim);
    daydim = max(200, daydim);

    if (in3dmode() && videomodereset == 0 &&
            (davidoption == fullscreen) && (xdim == daxdim) && (ydim == daydim) && (bpp == dabpp))
        return(0);

    Bstrcpy(kensmessage,"!!!! BUILD engine&tools programmed by Ken Silverman of E.G. RI."
           "  (c) Copyright 1995 Ken Silverman.  Summary:  BUILD = Ken. !!!!");
    //  if (getkensmessagecrc(FP_OFF(kensmessage)) != 0x56c764d4)
    //      { OSD_Printf("Nice try.\n"); exit(0); }

    //if (checkvideomode(&daxdim, &daydim, dabpp, davidoption)<0) return (-1);

    //bytesperline is set in this function

    j = bpp;

    g_lastpalettesum = 0;
    if (setvideomode(daxdim,daydim,dabpp,davidoption) < 0) return(-1);

    // Workaround possible bugs in the GL driver
    makeasmwriteable();

#ifdef USE_OPENGL
    if (dabpp > 8) rendmode = glrendmode;    // GL renderer
    else if (dabpp == 8 && j > 8) rendmode = REND_CLASSIC;
#endif

    xdim = daxdim; ydim = daydim;

    if (lookups != NULL)
        Bfree(lookups);

    j = ydim*4;  //Leave room for horizlookup&horizlookup2
    lookups = (int32_t *)Bmalloc(2*j*sizeof(lookups[0]));

    if (lookups == NULL)
    {
        initprintf("OUT OF MEMORY in setgamemode!\n");
        uninitengine();
        exit(1);
    }

    horizlookup = lookups;
    horizlookup2 = lookups + j;
    horizycent = ((ydim*4)>>1);

    //Force drawrooms to call dosetaspect & recalculate stuff
    oxyaspect = oxdimen = oviewingrange = -1;

    calc_ylookup(bytesperline, ydim);

    setview(0L,0L,xdim-1,ydim-1);
    clearallviews(0L);
    setbrightness(curbrightness,0,0);

    if (searchx < 0) { searchx = halfxdimen; searchy = (ydimen>>1); }

#ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST)
    {
        polymost_glreset();
        polymost_glinit();
    }
# ifdef POLYMER
    if (getrendermode() == REND_POLYMER)
    {
        if (!polymer_init())
            rendmode = REND_POLYMOST;
    }
#endif
#endif
    qsetmode = 200;
    return(0);
}


//
// nextpage
//
void nextpage(void)
{
    int32_t i;
    permfifotype *per;

    //char snotbuf[32];
    //j = 0; k = 0;
    //for(i=0;i<4096;i++)
    //   if (waloff[i] != 0)
    //   {
    //      sprintf(snotbuf,"%d-%d",i,tilesizx[i]*tilesizy[i]);
    //      printext256((j>>5)*40+32,(j&31)*6,walock[i]>>3,-1,snotbuf,1);
    //      k += tilesizx[i]*tilesizy[i];
    //      j++;
    //   }
    //sprintf(snotbuf,"Total: %d",k);
    //printext256((j>>5)*40+32,(j&31)*6,31,-1,snotbuf,1);

    switch (qsetmode)
    {
    case 200:
        begindrawing(); //{{{
        for (i=permtail; i!=permhead; i=((i+1)&(MAXPERMS-1)))
        {
            per = &permfifo[i];
            if ((per->pagesleft > 0) && (per->pagesleft <= numpages))
                dorotatesprite(per->sx,per->sy,per->z,per->a,per->picnum,
                               per->dashade,per->dapalnum,per->dastat,per->daalpha,
                               per->cx1,per->cy1,per->cx2,per->cy2,per->uniqid);
        }
        enddrawing();   //}}}

        OSD_Draw();
        showframe(0);

        begindrawing(); //{{{
        for (i=permtail; i!=permhead; i=((i+1)&(MAXPERMS-1)))
        {
            per = &permfifo[i];
            if (per->pagesleft >= 130)
                dorotatesprite(per->sx,per->sy,per->z,per->a,per->picnum,
                               per->dashade,per->dapalnum,per->dastat,per->daalpha,
                               per->cx1,per->cy1,per->cx2,per->cy2,per->uniqid);

            if (per->pagesleft&127) per->pagesleft--;
            if (((per->pagesleft&127) == 0) && (i == permtail))
                permtail = ((permtail+1)&(MAXPERMS-1));
        }
        enddrawing();   //}}}
        break;

    case 350:
    case 480:
        break;
    }
    faketimerhandler();

    if ((totalclock >= lastageclock+CACHEAGETIME) || (totalclock < lastageclock))
        { lastageclock = totalclock; agecache(); }

#ifdef USE_OPENGL
    omdtims = mdtims; mdtims = getticks();

    {
        int32_t i;
        for (i=0; i<MAXSPRITES; i++)
            if ((mdpause&&spriteext[i].mdanimtims)||(spriteext[i].flags & SPREXT_NOMDANIM))
                spriteext[i].mdanimtims+=mdtims-omdtims;
    }
#endif

    beforedrawrooms = 1;
    numframes++;
}

static void set_picsiz(int32_t picnum)
{
    int32_t j;

    j = 15;
    while ((j > 1) && (pow2long[j] > tilesizx[picnum]))
        j--;
    picsiz[picnum] = j;

    j = 15;
    while ((j > 1) && (pow2long[j] > tilesizy[picnum]))
        j--;
    picsiz[picnum] |= j<<4;
}

void set_tilesiz(int32_t picnum, int16_t dasizx, int16_t dasizy)
{
    tilesizx[picnum] = dasizx;
    tilesizy[picnum] = dasizy;

    set_picsiz(picnum);
}

int32_t tile_exists(int32_t picnum)
{
    if (waloff[picnum] == 0)
        loadtile(picnum);

    return (waloff[picnum] != 0 && tilesizx[picnum] > 0 && tilesizy[picnum] > 0);
}

//
// loadpics
//
int32_t loadpics(const char *filename, int32_t askedsize)
{
    int32_t i, tilefilei;

    Bstrncpyz(artfilename, filename, sizeof(artfilename));

    Bmemset(tilesizx, 0, sizeof(tilesizx));
    Bmemset(tilesizy, 0, sizeof(tilesizy));
    Bmemset(picanm, 0, sizeof(picanm));

    artsize = 0;

    for (tilefilei=0; tilefilei<MAXTILEFILES; tilefilei++)
    {
        int32_t fil;

        artfilename[7] = (tilefilei%10)+48;
        artfilename[6] = ((tilefilei/10)%10)+48;
        artfilename[5] = ((tilefilei/100)%10)+48;

        if ((fil = kopen4load(artfilename,0)) != -1)
        {
            int32_t localtilestart, localtileend, localnumtiles;
            int32_t offscount, numtiles_dummy;

            kread(fil,&artversion,4); artversion = B_LITTLE32(artversion);
            if (artversion != 1)
            {
                initprintf("loadpics: Invalid art file version in %s\n", artfilename);
                kclose(fil);
                continue;
            }

            kread(fil,&numtiles_dummy,4);
            kread(fil,&localtilestart,4); localtilestart = B_LITTLE32(localtilestart);
            kread(fil,&localtileend,4);   localtileend   = B_LITTLE32(localtileend);

            if ((uint32_t)localtilestart >= MAXTILES || (uint32_t)localtileend >= MAXTILES)
            {
                initprintf("loadpics: Invalid localtilestart or localtileend in %s\n", artfilename);
                kclose(fil);
                continue;
            }
            if (localtileend <= localtilestart)
            {
                initprintf("loadpics: localtileend <= localtilestart in %s\n", artfilename);
                kclose(fil);
                continue;
            }

            localnumtiles = (localtileend-localtilestart+1);

            kread(fil,&tilesizx[localtilestart], localnumtiles<<1);
            kread(fil,&tilesizy[localtilestart], localnumtiles<<1);
            kread(fil,&picanm[localtilestart], localnumtiles<<2);

            for (i=localtilestart; i<=localtileend; i++)
            {
                tilesizx[i] = B_LITTLE16(tilesizx[i]);
                tilesizy[i] = B_LITTLE16(tilesizy[i]);

                Bassert(sizeof(picanm_t)==4);
                Bassert(PICANM_ANIMTYPE_MASK == 192);
                // Old on-disk format: anim type is in the 2 highest bits of the lowest byte.
                picanm[i].sf &= ~192;
                picanm[i].sf |= picanm[i].num&192;
                picanm[i].num &= ~192;

                // don't allow setting texhitscan/nofullbright from ART (yet?)
                picanm[i].sf &= ~PICANM_MISC_MASK;
            }

            offscount = 4+4+4+4+(localnumtiles<<3);
            for (i=localtilestart; i<=localtileend; i++)
            {
                int32_t dasiz = tilesizx[i]*tilesizy[i];

                tilefilenum[i] = tilefilei;
                tilefileoffs[i] = offscount;

                offscount += dasiz;
                artsize += ((dasiz+15)&0xfffffff0);
            }

#ifdef WITHKPLIB
            if (cache1d_file_fromzip(fil)) // from zip
            {
                i = kfilelength(fil);
                artptrs[tilefilei] = (char *)Brealloc(artptrs[tilefilei], i);
                klseek(fil, 0, BSEEK_SET);
                kread(fil, artptrs[tilefilei], i);
            }
#endif
            kclose(fil);
        }
    }

    Bmemset(gotpic, 0, sizeof(gotpic));

    //cachesize = min((int32_t)((Bgetsysmemsize()/100)*60),max(artsize,askedsize));
    if (Bgetsysmemsize() <= (uint32_t)askedsize)
        cachesize = (Bgetsysmemsize()/100)*60;
    else
        cachesize = askedsize;

    while ((pic = Bmalloc(cachesize)) == NULL)
    {
        cachesize -= 65536;
        if (cachesize < 65536) return(-1);
    }
    initcache((intptr_t)pic, cachesize);

    for (i=0; i<MAXTILES; i++)
        set_picsiz(i);

    artfil = -1;
    artfilnum = -1;
    artfilplc = 0L;

    return(0);
}


//
// loadtile
//
void loadtile(int16_t tilenume)
{
    int32_t i, dasiz;

    if ((unsigned)tilenume >= (unsigned)MAXTILES) return;
    if ((dasiz = tilesizx[tilenume]*tilesizy[tilenume]) <= 0) return;

    i = tilefilenum[tilenume];

#ifdef WITHKPLIB
    if (artptrs[i]) // from zip
    {
        waloff[tilenume] = (intptr_t)(artptrs[i]) + tilefileoffs[tilenume];
        faketimerhandler();
        // OSD_Printf("loaded tile %d from zip\n", tilenume);

        return;
    }
#endif

    if (i != artfilnum)
    {
        if (artfil != -1) kclose(artfil);
        artfilnum = i;
        artfilplc = 0L;

        artfilename[7] = (i%10)+48;
        artfilename[6] = ((i/10)%10)+48;
        artfilename[5] = ((i/100)%10)+48;
        artfil = kopen4load(artfilename,0);
        faketimerhandler();
    }

//    if (cachedebug) OSD_Printf("Tile:%d\n",tilenume);

    // dummy tiles for highres replacements and tilefromtexture definitions
    if (faketilesiz[tilenume])
    {
        if (faketilesiz[tilenume] == -1)
        {
            walock[tilenume] = 255; // permanent tile
            allocache(&waloff[tilenume], dasiz, &walock[tilenume]);
            Bmemset((char *)waloff[tilenume],0,dasiz);
        }
        else if (faketiledata[tilenume] != NULL)
        {
            walock[tilenume] = 255;
            allocache(&waloff[tilenume], dasiz, &walock[tilenume]);
            qlz_decompress(faketiledata[tilenume], (char *)waloff[tilenume], state_decompress);
            Bfree(faketiledata[tilenume]);
            faketiledata[tilenume] = NULL;
        }

        faketimerhandler();
        return;
    }

    if (waloff[tilenume] == 0)
    {
        walock[tilenume] = 199;
        allocache(&waloff[tilenume],dasiz,&walock[tilenume]);
    }

    if (artfilplc != tilefileoffs[tilenume])
    {
        klseek(artfil,tilefileoffs[tilenume]-artfilplc,BSEEK_CUR);
        faketimerhandler();
    }

    kread(artfil, (char *)waloff[tilenume], dasiz);
    faketimerhandler();
    artfilplc = tilefileoffs[tilenume]+dasiz;

#ifdef DEBUG_TILESIZY_512
    if (tilesizy[tilenume] >= 512)
    {
        int32_t i;
        char *p = (char *)waloff[tilenume];
        for (i=0; i<tilesizx[tilenume]*tilesizy[tilenume]; i++)
            p[i] = i;
    }
#endif
#ifdef DEBUG_TILEOFFSETS
    // Add some dark blue marker lines to STEAM and CEILINGSTEAM.
    // See test_tileoffsets.map.
    if (tilenume==1250 || tilenume==1255)
    {
        char *p = (char *)waloff[tilenume];
        p[0] = p[1] = p[2] = p[3] = 254;
    }

    // Add some offset to the cocktail glass neon sign. It's more asymmetric
    // than the steam, and thus more suited to debugging the spatial
    // orientation of drawn sprites.
    if (tilenume==1008)
    {
        picanm[tilenume].xofs = 8;
        picanm[tilenume].yofs = 12;
    }
#endif
}

//
// allocatepermanenttile
//
intptr_t allocatepermanenttile(int16_t tilenume, int32_t xsiz, int32_t ysiz)
{
    int32_t dasiz;

    if ((xsiz <= 0) || (ysiz <= 0) || ((unsigned)tilenume >= (unsigned)MAXTILES))
        return(0);

    dasiz = xsiz*ysiz;

    walock[tilenume] = 255;
    allocache(&waloff[tilenume],dasiz,&walock[tilenume]);

    set_tilesiz(tilenume, xsiz, ysiz);
    Bmemset(&picanm[tilenume], 0, sizeof(picanm_t));

    return(waloff[tilenume]);
}

#if 0
//
// copytilepiece
//
void copytilepiece(int32_t tilenume1, int32_t sx1, int32_t sy1, int32_t xsiz, int32_t ysiz,
                   int32_t tilenume2, int32_t sx2, int32_t sy2)
{
    char *ptr1, *ptr2, dat;
    int32_t xsiz1, ysiz1, xsiz2, ysiz2, i, j, x1, y1, x2, y2;

    xsiz1 = tilesizx[tilenume1]; ysiz1 = tilesizy[tilenume1];
    xsiz2 = tilesizx[tilenume2]; ysiz2 = tilesizy[tilenume2];
    if ((xsiz1 > 0) && (ysiz1 > 0) && (xsiz2 > 0) && (ysiz2 > 0))
    {
        if (waloff[tilenume1] == 0) loadtile(tilenume1);
        if (waloff[tilenume2] == 0) loadtile(tilenume2);

        x1 = sx1;
        for (i=0; i<xsiz; i++)
        {
            y1 = sy1;
            for (j=0; j<ysiz; j++)
            {
                x2 = sx2+i;
                y2 = sy2+j;
                if ((x2 >= 0) && (y2 >= 0) && (x2 < xsiz2) && (y2 < ysiz2))
                {
                    ptr1 = (char *)(waloff[tilenume1] + x1*ysiz1 + y1);
                    ptr2 = (char *)(waloff[tilenume2] + x2*ysiz2 + y2);
                    dat = *ptr1;
                    if (dat != 255)
                        *ptr2 = *ptr1;
                }

                y1++; if (y1 >= ysiz1) y1 = 0;
            }
            x1++; if (x1 >= xsiz1) x1 = 0;
        }
    }
}
#endif

//
// qloadkvx
//
int32_t qloadkvx(int32_t voxindex, const char *filename)
{
    int32_t i, fil, dasiz, lengcnt, lengtot;
    char *ptr;

    if ((fil = kopen4load(filename,0)) == -1) return -1;

    lengcnt = 0;
    lengtot = kfilelength(fil);

    for (i=0; i<MAXVOXMIPS; i++)
    {
        kread(fil,&dasiz,4); dasiz = B_LITTLE32(dasiz);
        //Must store filenames to use cacheing system :(
        voxlock[voxindex][i] = 200;
        allocache(&voxoff[voxindex][i],dasiz,&voxlock[voxindex][i]);
        ptr = (char *)voxoff[voxindex][i];
        kread(fil,ptr,dasiz);

        lengcnt += dasiz+4;
        if (lengcnt >= lengtot-768) break;
    }
    kclose(fil);

#ifdef USE_OPENGL
    if (voxmodels[voxindex])
    {
        voxfree(voxmodels[voxindex]);
        voxmodels[voxindex] = NULL;
    }
    voxmodels[voxindex] = voxload(filename);
#endif
    return 0;
}


//
// clipinsidebox
//
int32_t clipinsidebox(int32_t x, int32_t y, int16_t wallnum, int32_t walldist)
{
    walltype *wal;
    int32_t x1, y1, x2, y2;

    const int32_t r = walldist<<1;

    wal = &wall[wallnum];     x1 = wal->x+walldist-x; y1 = wal->y+walldist-y;
    wal = &wall[wal->point2]; x2 = wal->x+walldist-x; y2 = wal->y+walldist-y;

    if ((x1 < 0) && (x2 < 0)) return(0);
    if ((y1 < 0) && (y2 < 0)) return(0);
    if ((x1 >= r) && (x2 >= r)) return(0);
    if ((y1 >= r) && (y2 >= r)) return(0);

    x2 -= x1; y2 -= y1;
    if (x2*(walldist-y1) >= y2*(walldist-x1))  //Front
    {
        if (x2 > 0) x2 *= (0-y1); else x2 *= (r-y1);
        if (y2 > 0) y2 *= (r-x1); else y2 *= (0-x1);
        return(x2 < y2);
    }
    if (x2 > 0) x2 *= (r-y1); else x2 *= (0-y1);
    if (y2 > 0) y2 *= (0-x1); else y2 *= (r-x1);
    return((x2 >= y2)<<1);
}


//
// clipinsideboxline
//
int32_t clipinsideboxline(int32_t x, int32_t y, int32_t x1, int32_t y1, int32_t x2, int32_t y2, int32_t walldist)
{
    const int32_t r = walldist<<1;

    x1 += walldist-x; x2 += walldist-x;
    if ((x1 < 0) && (x2 < 0)) return(0);
    if ((x1 >= r) && (x2 >= r)) return(0);

    y1 += walldist-y; y2 += walldist-y;
    if ((y1 < 0) && (y2 < 0)) return(0);
    if ((y1 >= r) && (y2 >= r)) return(0);

    x2 -= x1; y2 -= y1;
    if (x2*(walldist-y1) >= y2*(walldist-x1))  //Front
    {
        if (x2 > 0) x2 *= (0-y1); else x2 *= (r-y1);
        if (y2 > 0) y2 *= (r-x1); else y2 *= (0-x1);
        return(x2 < y2);
    }
    if (x2 > 0) x2 *= (r-y1); else x2 *= (0-y1);
    if (y2 > 0) y2 *= (0-x1); else y2 *= (r-x1);
    return((x2 >= y2)<<1);
}


//
// inside
//
// See http://fabiensanglard.net/duke3d/build_engine_internals.php,
// "Inside details" for the idea behind the algorithm.
int32_t inside(int32_t x, int32_t y, int16_t sectnum)
{
    if (sectnum >= 0 && sectnum < numsectors)
    {
        uint32_t cnt1 = 0, cnt2 = 0;
        walltype *wal = &wall[sector[sectnum].wallptr];
        int32_t i = sector[sectnum].wallnum;

        do
        {
            // Get the x and y components of the [tested point]-->[wall
            // point{1,2}] vectors.
            int32_t x1 = wal->x-x, x2 = wall[wal->point2].x-x;
            int32_t y1 = wal->y-y, y2 = wall[wal->point2].y-y;

            // First, test if the point is EXACTLY_ON_WALL_POINT.
            if ((x1|y1) == 0 || (x2|y2)==0)
                return 1;

            // If their signs differ[*], ...
            //
            // [*] where '-' corresponds to <0 and '+' corresponds to >=0.
            // Equivalently, the branch is taken iff
            //   y1 != y2 AND y_m <= y < y_M,
            // where y_m := min(y1, y2) and y_M := max(y1, y2).
            if ((y1^y2) < 0)
            {
                if ((x1^x2) >= 0)
                    cnt1 ^= x1;
                else
                    cnt1 ^= (x1*y2-x2*y1)^y2;
            }

            y1--;
            y2--;

            // Now, do the same comparisons, but with the interval half-open on
            // the other side! That is, take the branch iff
            //   y1 != y2 AND y_m < y <= y_M,
            // For a rectangular sector, without EXACTLY_ON_WALL_POINT, this
            // would still leave the lower left and upper right points
            // "outside" the sector.
            if ((y1^y2) < 0)
            {
                x1--;
                x2--;

                if ((x1^x2) >= 0)
                    cnt2 ^= x1;
                else
                    cnt2 ^= (x1*y2-x2*y1)^y2;
            }

            wal++; i--;
        }
        while (i);

        return (cnt1|cnt2)>>31;
    }

    return -1;
}

int32_t __fastcall getangle(int32_t xvect, int32_t yvect)
{
    if ((xvect|yvect) == 0) return(0);
    if (xvect == 0) return 512+((yvect<0)<<10);
    if (yvect == 0) return ((xvect<0)<<10);
    if (xvect == yvect) return 256+((xvect<0)<<10);
    if (xvect == -yvect) return 768+((xvect>0)<<10);
    if (klabs(xvect) > klabs(yvect))
        return ((radarang[640+scale(160,yvect,xvect)]>>6)+((xvect<0)<<10))&2047;
    return ((radarang[640-scale(160,xvect,yvect)]>>6)+512+((yvect<0)<<10))&2047;
}

//
// ksqrt
//
int32_t ksqrt(uint32_t num)
{
    return nsqrtasm(num);
}

//
// krecip
//
int32_t krecip(int32_t num)
{
    return krecipasm(num);
}

#ifdef LUNATIC
int32_t Mulscale(int32_t a, int32_t b, int32_t sh)
{
    return mulscale(a, b, sh);
}
#endif

// Gets the BUILD unit height and z offset of a sprite.
// Returns the z offset, 'height' may be NULL.
int32_t spriteheightofsptr(const spritetype *spr, int32_t *height, int32_t alsotileyofs)
{
    int32_t hei, zofs=0;
    const int32_t picnum=spr->picnum, yrepeat=spr->yrepeat;

    hei = (tilesizy[picnum]*yrepeat)<<2;
    *height = hei;

    if (spr->cstat&128)
        zofs = hei>>1;

    // NOTE: a positive per-tile yoffset translates the sprite into the
    // negative world z direction (i.e. upward).
    if (alsotileyofs)
        zofs -= picanm[picnum].yofs*yrepeat<<2;

    return zofs;
}

//
// setsprite
//
int32_t setsprite(int16_t spritenum, const vec3_t *newpos)
{
    int16_t tempsectnum = sprite[spritenum].sectnum;

    if ((void *)newpos != (void *)&sprite[spritenum])
        Bmemcpy(&sprite[spritenum], newpos, sizeof(vec3_t));

    updatesector(newpos->x,newpos->y,&tempsectnum);

    if (tempsectnum < 0)
        return(-1);
    if (tempsectnum != sprite[spritenum].sectnum)
        changespritesect(spritenum,tempsectnum);

    return(0);
}

int32_t setspritez(int16_t spritenum, const vec3_t *newpos)
{
    int16_t tempsectnum = sprite[spritenum].sectnum;

    if ((void *)newpos != (void *)&sprite[spritenum])
        Bmemcpy(&sprite[spritenum], newpos, sizeof(vec3_t));

    updatesectorz(newpos->x,newpos->y,newpos->z,&tempsectnum);

    if (tempsectnum < 0)
        return(-1);
    if (tempsectnum != sprite[spritenum].sectnum)
        changespritesect(spritenum,tempsectnum);

    return(0);
}


//
// nextsectorneighborz
//
// -1: ceiling or up
//  1: floor or down
int32_t nextsectorneighborz(int16_t sectnum, int32_t thez, int16_t topbottom, int16_t direction)
{
    int32_t nextz = (direction==1) ? INT32_MAX : INT32_MIN;
    int32_t sectortouse = -1;

    walltype *wal = &wall[sector[sectnum].wallptr];
    int32_t i = sector[sectnum].wallnum;

    do
    {
        const int32_t ns = wal->nextsector;

        if (ns >= 0)
        {
            const int32_t testz = (topbottom==1) ?
                sector[ns].floorz : sector[ns].ceilingz;

            int32_t ok;

            if (direction == 1)
                ok = (testz > thez && testz < nextz);
            else
                ok = (testz < thez && testz > nextz);

            if (ok)
            {
                nextz = testz;
                sectortouse = wal->nextsector;
            }
        }

        wal++;
        i--;
    }
    while (i != 0);

    return(sectortouse);
}


//
// cansee
//
int32_t cansee(int32_t x1, int32_t y1, int32_t z1, int16_t sect1, int32_t x2, int32_t y2, int32_t z2, int16_t sect2)
{
    int32_t dacnt, danum;
    const int32_t x21 = x2-x1, y21 = y2-y1, z21 = z2-z1;

    static uint8_t sectbitmap[MAXSECTORS>>3];
#ifdef YAX_ENABLE
    int16_t pendingsectnum;
    vec3_t pendingvec;

    // Negative sectnums can happen, for example if the player is using noclip.
    // MAXSECTORS can happen from C-CON, e.g. canseespr with a sprite not in
    // the game world.
    if ((unsigned)sect1 >= MAXSECTORS || (unsigned)sect2 >= MAXSECTORS)
        return 0;

    Bmemset(&pendingvec, 0, sizeof(vec3_t));  // compiler-happy
#endif
    Bmemset(sectbitmap, 0, (numsectors+7)>>3);
#ifdef YAX_ENABLE
restart_grand:
#endif
    if (x1 == x2 && y1 == y2)
        return (sect1 == sect2);

#ifdef YAX_ENABLE
    pendingsectnum = -1;
#endif
    sectbitmap[sect1>>3] |= (1<<(sect1&7));
    clipsectorlist[0] = sect1; danum = 1;

    for (dacnt=0; dacnt<danum; dacnt++)
    {
        const int32_t dasectnum = clipsectorlist[dacnt];
        const sectortype *const sec = &sector[dasectnum];
        const walltype *wal;
        int32_t cnt;
#ifdef YAX_ENABLE
        int32_t cfz1[2], cfz2[2];  // both wrt dasectnum
        int16_t bn[2];

        yax_getbunches(dasectnum, &bn[0], &bn[1]);
        getzsofslope(dasectnum, x1,y1, &cfz1[0], &cfz1[1]);
        getzsofslope(dasectnum, x2,y2, &cfz2[0], &cfz2[1]);
#endif
        for (cnt=sec->wallnum,wal=&wall[sec->wallptr]; cnt>0; cnt--,wal++)
        {
            const walltype *const wal2 = &wall[wal->point2];
            const int32_t x31 = wal->x-x1, x34 = wal->x-wal2->x;
            const int32_t y31 = wal->y-y1, y34 = wal->y-wal2->y;

            int32_t x, y, z, nexts, t, bot;
            int32_t cfz[2];

            bot = y21*x34-x21*y34; if (bot <= 0) continue;
            // XXX: OVERFLOW
            t = y21*x31-x21*y31; if ((unsigned)t >= (unsigned)bot) continue;
            t = y31*x34-x31*y34;
            if ((unsigned)t >= (unsigned)bot)
            {
#ifdef YAX_ENABLE
                if (t >= bot)
                {
                    int32_t cf, frac, ns;
                    for (cf=0; cf<2; cf++)
                    {
                        if ((cf==0 && bn[0]>=0 && z1 > cfz1[0] && cfz2[0] > z2) ||
                            (cf==1 && bn[1]>=0 && z1 < cfz1[1] && cfz2[1] < z2))
                        {
                            if ((cfz1[cf]-cfz2[cf])-(z1-z2)==0)
                                continue;
                            frac = divscale24(z1-cfz1[cf], (z1-z2)-(cfz1[cf]-cfz2[cf]));

                            if ((unsigned)frac >= (1<<24))
                                continue;

                            x = x1 + mulscale24(x21,frac);
                            y = y1 + mulscale24(y21,frac);

                            ns = yax_getneighborsect(x, y, dasectnum, cf);
                            if (ns < 0)
                                continue;

                            if (!(sectbitmap[ns>>3] & (1<<(ns&7))) && pendingsectnum==-1)
                            {
                                sectbitmap[ns>>3] |= (1<<(ns&7));
                                pendingsectnum = ns;
                                pendingvec.x = x;
                                pendingvec.y = y;
                                pendingvec.z = z1 + mulscale24(z21,frac);
                            }
                        }
                    }
                }
#endif
                continue;
            }

            nexts = wal->nextsector;

#ifdef YAX_ENABLE
            if (bn[0]<0 && bn[1]<0)
#endif
                if (nexts < 0 || wal->cstat&32)
                    return 0;

            t = divscale24(t,bot);
            x = x1 + mulscale24(x21,t);
            y = y1 + mulscale24(y21,t);
            z = z1 + mulscale24(z21,t);

            getzsofslope(dasectnum, x,y, &cfz[0],&cfz[1]);

            if (z <= cfz[0] || z >= cfz[1])
            {
#ifdef YAX_ENABLE
                int32_t cf, frac;

                // XXX: Is this any good?
                for (cf=0; cf<2; cf++)
                    if ((cf==0 && bn[0]>=0 && z <= cfz[0] && z1 >= cfz1[0]) ||
                        (cf==1 && bn[1]>=0 && z >= cfz[1] && z1 <= cfz1[1]))
                    {
                        if ((cfz1[cf]-cfz[cf])-(z1-z)==0)
                            continue;

                        frac = divscale24(z1-cfz1[cf], (z1-z)-(cfz1[cf]-cfz[cf]));
                        t = mulscale24(t, frac);

                        if ((unsigned)t < (1<<24))
                        {
                            x = x1 + mulscale24(x21,t);
                            y = y1 + mulscale24(y21,t);

                            nexts = yax_getneighborsect(x, y, dasectnum, cf);
                            if (nexts >= 0)
                                goto add_nextsector;
                        }
                    }
                
#endif
                return 0;
            }

#ifdef YAX_ENABLE
            if (nexts < 0 || (wal->cstat&32))
                return 0;
#endif
            getzsofslope(nexts, x,y, &cfz[0],&cfz[1]);
            if (z <= cfz[0] || z >= cfz[1])
                return 0;

add_nextsector:
            if (!(sectbitmap[nexts>>3] & (1<<(nexts&7))))
            {
                sectbitmap[nexts>>3] |= (1<<(nexts&7));
                clipsectorlist[danum++] = nexts;
            }
        }

#ifdef YAX_ENABLE
        if (pendingsectnum>=0)
        {
            sect1 = pendingsectnum;
            x1 = pendingvec.x;
            y1 = pendingvec.y;
            z1 = pendingvec.z;
            goto restart_grand;
        }
#endif
    }

    if (sectbitmap[sect2>>3] & (1<<(sect2&7)))
        return 1;

    return 0;
}

static inline void hit_set(hitdata_t *hit, int32_t sectnum, int32_t wallnum, int32_t spritenum,
                           int32_t x, int32_t y, int32_t z)
{
    hit->sect = sectnum;
    hit->wall = wallnum;
    hit->sprite = spritenum;
    hit->pos.x = x;
    hit->pos.y = y;
    hit->pos.z = z;
}

static int32_t hitscan_hitsectcf=-1;

// stat, heinum, z: either ceiling- or floor-
// how: -1: behave like ceiling, 1: behave like floor
static int32_t hitscan_trysector(const vec3_t *sv, const sectortype *sec, hitdata_t *hit,
                                 int32_t vx, int32_t vy, int32_t vz,
                                 uint16_t stat, int16_t heinum, int32_t z, int32_t how, const intptr_t *tmp)
{
    int32_t x1 = INT32_MAX, y1, z1;
    int32_t i;

    if (stat&2)
    {
        const walltype *const wal = &wall[sec->wallptr];
        const walltype *const wal2 = &wall[wal->point2];
        int32_t j, dax=wal2->x-wal->x, day=wal2->y-wal->y;

        i = nsqrtasm(uhypsq(dax,day)); if (i == 0) return 1; //continue;
        i = divscale15(heinum,i);
        dax *= i; day *= i;

        j = (vz<<8)-dmulscale15(dax,vy,-day,vx);
        if (j != 0)
        {
            i = ((z - sv->z)<<8)+dmulscale15(dax,sv->y-wal->y,-day,sv->x-wal->x);
            if (((i^j) >= 0) && ((klabs(i)>>1) < klabs(j)))
            {
                i = divscale30(i,j);
                x1 = sv->x + mulscale30(vx,i);
                y1 = sv->y + mulscale30(vy,i);
                z1 = sv->z + mulscale30(vz,i);
            }
        }
    }
    else if ((how*vz > 0) && (how*sv->z <= how*z))
    {
        z1 = z; i = z1-sv->z;
        if ((klabs(i)>>1) < vz*how)
        {
            i = divscale30(i,vz);
            x1 = sv->x + mulscale30(vx,i);
            y1 = sv->y + mulscale30(vy,i);
        }
    }

    if ((x1 != INT32_MAX) && (klabs(x1-sv->x)+klabs(y1-sv->y) < klabs((hit->pos.x)-sv->x)+klabs((hit->pos.y)-sv->y)))
    {
        if (tmp==NULL)
        {
            if (inside(x1,y1,sec-sector) == 1)
            {
                hit_set(hit, sec-sector, -1, -1, x1, y1, z1);
                hitscan_hitsectcf = (how+1)>>1;
            }
        }
        else
        {
            const int32_t curidx=(int32_t)tmp[0];
            const spritetype *const curspr=(spritetype *)tmp[1];
            const int32_t thislastsec = tmp[2];

            if (!thislastsec)
            {
                if (inside(x1,y1,sec-sector) == 1)
                    hit_set(hit, curspr->sectnum, -1, curspr-sprite, x1, y1, z1);
            }
#ifdef HAVE_CLIPSHAPE_FEATURE
            else
            {
                for (i=clipinfo[curidx].qbeg; i<clipinfo[curidx].qend; i++)
                {
                    if (inside(x1,y1,sectq[i]) == 1)
                    {
                        hit_set(hit, curspr->sectnum, -1, curspr-sprite, x1, y1, z1);
                        break;
                    }
                }
            }
#endif
        }
    }

    return 0;
}

// x1, y1: in/out
// rest x/y: out
static void get_wallspr_points(const spritetype *spr, int32_t *x1, int32_t *x2,
                              int32_t *y1, int32_t *y2)
{
    //These lines get the 2 points of the rotated sprite
    //Given: (x1, y1) starts out as the center point

    const int32_t tilenum=spr->picnum, ang=spr->ang;
    const int32_t xrepeat = spr->xrepeat;
    int32_t xoff = picanm[tilenum].xofs + spr->xoffset;
    int32_t k, l, dax, day;

    if (spr->cstat&4)
        xoff = -xoff;

    dax = sintable[ang&2047]*xrepeat;
    day = sintable[(ang+1536)&2047]*xrepeat;

    l = tilesizx[tilenum];
    k = (l>>1)+xoff;

    *x1 -= mulscale16(dax,k);
    *x2 = *x1 + mulscale16(dax,l);

    *y1 -= mulscale16(day,k);
    *y2 = *y1 + mulscale16(day,l);
}

// x1, y1: in/out
// rest x/y: out
static void get_floorspr_points(const spritetype *spr, int32_t px, int32_t py,
                               int32_t *x1, int32_t *x2, int32_t *x3, int32_t *x4,
                               int32_t *y1, int32_t *y2, int32_t *y3, int32_t *y4)
{
    const int32_t tilenum = spr->picnum;
    // &2047 in sinang:
    // DNE 1.3D lights camera action (1st level), spr->ang==2306
    // (probably from CON)
    const int32_t cosang = sintable[(spr->ang+512)&2047];
    const int32_t sinang = sintable[spr->ang&2047];

    const int32_t xspan=tilesizx[tilenum], xrepeat=spr->xrepeat;
    const int32_t yspan=tilesizy[tilenum], yrepeat=spr->yrepeat;

    int32_t xoff = picanm[tilenum].xofs + spr->xoffset;
    int32_t yoff = picanm[tilenum].yofs + spr->yoffset;
    int32_t k, l, dax, day;

    if (spr->cstat&4)
        xoff = -xoff;
    if (spr->cstat&8)
        yoff = -yoff;

    dax = ((xspan>>1)+xoff)*xrepeat;
    day = ((yspan>>1)+yoff)*yrepeat;

    *x1 += dmulscale16(sinang,dax, cosang,day) - px;
    *y1 += dmulscale16(sinang,day, -cosang,dax) - py;

    l = xspan*xrepeat;
    *x2 = *x1 - mulscale16(sinang,l);
    *y2 = *y1 + mulscale16(cosang,l);

    l = yspan*yrepeat;
    k = -mulscale16(cosang,l); *x3 = *x2+k; *x4 = *x1+k;
    k = -mulscale16(sinang,l); *y3 = *y2+k; *y4 = *y1+k;
}

static int32_t get_floorspr_clipyou(int32_t x1, int32_t x2, int32_t x3, int32_t x4,
                                   int32_t y1, int32_t y2, int32_t y3, int32_t y4)
{
    int32_t clipyou = 0;

    if ((y1^y2) < 0)
    {
        if ((x1^x2) < 0) clipyou ^= (x1*y2 < x2*y1)^(y1<y2);
        else if (x1 >= 0) clipyou ^= 1;
    }
    if ((y2^y3) < 0)
    {
        if ((x2^x3) < 0) clipyou ^= (x2*y3 < x3*y2)^(y2<y3);
        else if (x2 >= 0) clipyou ^= 1;
    }
    if ((y3^y4) < 0)
    {
        if ((x3^x4) < 0) clipyou ^= (x3*y4 < x4*y3)^(y3<y4);
        else if (x3 >= 0) clipyou ^= 1;
    }
    if ((y4^y1) < 0)
    {
        if ((x4^x1) < 0) clipyou ^= (x4*y1 < x1*y4)^(y4<y1);
        else if (x4 >= 0) clipyou ^= 1;
    }

    return clipyou;
}

// intp: point of currently best (closest) intersection
static int32_t try_facespr_intersect(const spritetype *spr, const vec3_t *refpos,
                                     int32_t vx, int32_t vy, int32_t vz,
                                     vec3_t *intp, int32_t strictly_smaller_than_p)
{
    const int32_t x1=spr->x, y1=spr->y;
    const int32_t xs=refpos->x, ys=refpos->y;

    const int32_t topt = vx*(x1-xs) + vy*(y1-ys);
    if (topt > 0)
    {
        const int32_t bot = vx*vx + vy*vy;
        if (bot != 0)
        {
            int32_t i;
            const int32_t intz = refpos->z + scale(vz,topt,bot);
            const int32_t z1 = spr->z + spriteheightofsptr(spr, &i, 1);

            if (intz >= z1-i && intz <= z1)
            {
                const int32_t topu = vx*(y1-ys) - vy*(x1-xs);

                const int32_t offx = scale(vx,topu,bot);
                const int32_t offy = scale(vy,topu,bot);
                const int32_t dist = offx*offx + offy*offy;

                i = tilesizx[spr->picnum]*spr->xrepeat;
                if (dist <= mulscale7(i,i))
                {
                    const int32_t intx = xs + scale(vx,topt,bot);
                    const int32_t inty = ys + scale(vy,topt,bot);

                    if (klabs(intx-xs)+klabs(inty-ys) + strictly_smaller_than_p
                            <= klabs(intp->x-xs)+klabs(intp->y-ys))
                    {
                        intp->x = intx;
                        intp->y = inty;
                        intp->z = intz;
                        return 1;
                    }
                }
            }
        }
    }

    return 0;
}

//
// hitscan
//
#ifdef HAVE_CLIPSHAPE_FEATURE
static int32_t clipsprite_initindex(int32_t curidx, spritetype *curspr, int32_t *clipsectcnt, const vec3_t *vect);
#endif

int32_t hitscan(const vec3_t *sv, int16_t sectnum, int32_t vx, int32_t vy, int32_t vz,
                hitdata_t *hit, uint32_t cliptype)
{
    int32_t x1, y1=0, z1=0, x2, y2, intx, inty, intz;
    int32_t i, k, daz;
    int16_t tempshortcnt, tempshortnum;

    spritetype *curspr = NULL;
    int32_t clipspritecnt, curidx=-1;
    // tmp: { (int32_t)curidx, (spritetype *)curspr, (!=0 if outer sector) }
    intptr_t tmp[3], *tmpptr=NULL;
#ifdef YAX_ENABLE
    vec3_t newsv;
    int32_t oldhitsect = -1, oldhitsect2 = -2;
#endif
    const int32_t dawalclipmask = (cliptype&65535);
    const int32_t dasprclipmask = (cliptype>>16);

    hit->sect = -1; hit->wall = -1; hit->sprite = -1;
    if (sectnum < 0) return(-1);

#ifdef YAX_ENABLE
restart_grand:
#endif
    hit->pos.x = hitscangoalx; hit->pos.y = hitscangoaly;

    clipsectorlist[0] = sectnum;
    tempshortcnt = 0; tempshortnum = 1;
    clipspritecnt = clipspritenum = 0;
    do
    {
        const sectortype *sec;
        const walltype *wal;
        int32_t dasector, z, startwall, endwall;

#ifdef HAVE_CLIPSHAPE_FEATURE
        if (tempshortcnt >= tempshortnum)
        {
            // one bunch of sectors completed, prepare the next
            if (!curspr)
                mapinfo_set(&origmapinfo, &clipmapinfo);  // replace sector and wall with clip map

            curspr = &sprite[clipspritelist[clipspritecnt]];

            if (curidx < 0)  // per-sprite init
                curidx = pictoidx[curspr->picnum];
            else
                curidx = clipinfo[curidx].next;

            while (curidx>=0 && (curspr->cstat&32) != (sector[sectq[clipinfo[curidx].qbeg]].CM_CSTAT&32))
                curidx = clipinfo[curidx].next;

            if (curidx < 0)
            {
                clipspritecnt++;
                continue;
            }

            tmp[0] = (intptr_t)curidx;
            tmp[1] = (intptr_t)curspr;
            tmpptr = tmp;

            clipsprite_initindex(curidx, curspr, &i, sv);  // &i is dummy
            tempshortnum = (int16_t)clipsectnum;
            tempshortcnt = 0;
        }
#endif
        dasector = clipsectorlist[tempshortcnt]; sec = &sector[dasector];

        i = 1;
#ifdef HAVE_CLIPSHAPE_FEATURE
        if (curspr)
        {
            if (dasector == sectq[clipinfo[curidx].qend])
            {
                i = -1;
                tmp[2] = 1;
            }
            else tmp[2] = 0;
        }
#endif
        if (hitscan_trysector(sv, sec, hit, vx,vy,vz, sec->ceilingstat, sec->ceilingheinum, sec->ceilingz, -i, tmpptr))
            continue;
        if (hitscan_trysector(sv, sec, hit, vx,vy,vz, sec->floorstat, sec->floorheinum, sec->floorz, i, tmpptr))
            continue;

        ////////// Walls //////////

        startwall = sec->wallptr; endwall = startwall + sec->wallnum;
        for (z=startwall,wal=&wall[startwall]; z<endwall; z++,wal++)
        {
            const int32_t nextsector = wal->nextsector;
            const walltype *const wal2 = &wall[wal->point2];
            int32_t daz2, zz;

            if (curspr && nextsector<0) continue;

            x1 = wal->x; y1 = wal->y; x2 = wal2->x; y2 = wal2->y;

            if ((int64_t)(x1-sv->x)*(y2-sv->y) < (int64_t)(x2-sv->x)*(y1-sv->y)) continue;
            if (rintersect(sv->x,sv->y,sv->z, vx,vy,vz, x1,y1, x2,y2, &intx,&inty,&intz) == -1) continue;

            if (klabs(intx-sv->x)+klabs(inty-sv->y) >= klabs((hit->pos.x)-sv->x)+klabs((hit->pos.y)-sv->y))
                continue;

            if (!curspr)
            {
                if ((nextsector < 0) || (wal->cstat&dawalclipmask))
                {
                    hit_set(hit, dasector, z, -1, intx, inty, intz);
                    continue;
                }

                getzsofslope(nextsector,intx,inty,&daz,&daz2);
                if (intz <= daz || intz >= daz2)
                {
                    hit_set(hit, dasector, z, -1, intx, inty, intz);
                    continue;
                }
            }
#ifdef HAVE_CLIPSHAPE_FEATURE
            else
            {
                int32_t cz,fz;

                if (wal->cstat&dawalclipmask)
                {
                    hit_set(hit, curspr->sectnum, -1, curspr-sprite, intx, inty, intz);
                    continue;
                }

                getzsofslope(nextsector,intx,inty,&daz,&daz2);
                getzsofslope(sectq[clipinfo[curidx].qend],intx,inty,&cz,&fz);
                // ceil   cz daz daz2 fz   floor
                if ((cz <= intz && intz <= daz) || (daz2 <= intz && intz <= fz))
                {
                    hit_set(hit, curspr->sectnum, -1, curspr-sprite, intx, inty, intz);
                    continue;
                }
            }
#endif
            for (zz=tempshortnum-1; zz>=0; zz--)
                if (clipsectorlist[zz] == nextsector) break;
            if (zz < 0) clipsectorlist[tempshortnum++] = nextsector;
        }

        ////////// Sprites //////////

        if (dasprclipmask==0)
            continue;

#ifdef HAVE_CLIPSHAPE_FEATURE
        if (curspr)
            continue;
#endif
        for (z=headspritesect[dasector]; z>=0; z=nextspritesect[z])
        {
            const spritetype *const spr = &sprite[z];
            const int32_t cstat = spr->cstat;
#ifdef USE_OPENGL
            if (!hitallsprites)
#endif
                if ((cstat&dasprclipmask) == 0)
                    continue;

#ifdef HAVE_CLIPSHAPE_FEATURE
            // try and see whether this sprite's picnum has sector-like clipping data
            i = pictoidx[spr->picnum];
            // handle sector-like floor sprites separately
            while (i>=0 && (spr->cstat&32) != (clipmapinfo.sector[sectq[clipinfo[i].qbeg]].CM_CSTAT&32))
                i = clipinfo[i].next;
            if (i>=0 && clipspritenum<MAXCLIPNUM)
            {
                clipspritelist[clipspritenum++] = z;
                continue;
            }
#endif
            x1 = spr->x; y1 = spr->y; z1 = spr->z;
            switch (cstat&48)
            {
            case 0:
            {
                if (try_facespr_intersect(spr, sv, vx, vy, vz, &hit->pos, 0))
                {
                    hit->sect = dasector;
                    hit->wall = -1;
                    hit->sprite = z;
                }

                break;
            }

            case 16:
            {
                int32_t ucoefup16;
                int32_t tilenum = spr->picnum;

                get_wallspr_points(spr, &x1, &x2, &y1, &y2);

                if ((cstat&64) != 0)   //back side of 1-way sprite
                    if ((int64_t)(x1-sv->x)*(y2-sv->y) < (int64_t)(x2-sv->x)*(y1-sv->y)) continue;

                ucoefup16 = rintersect(sv->x,sv->y,sv->z,vx,vy,vz,x1,y1,x2,y2,&intx,&inty,&intz);
                if (ucoefup16 == -1) continue;

                if (klabs(intx-sv->x)+klabs(inty-sv->y) > klabs((hit->pos.x)-sv->x)+klabs((hit->pos.y)-sv->y))
                    continue;

                daz = spr->z + spriteheightofs(z, &k, 1);
                if (intz > daz-k && intz < daz)
                {
                    if (picanm[tilenum].sf&PICANM_TEXHITSCAN_BIT)
                    {
                        DO_TILE_ANIM(tilenum, 0);

                        if (!waloff[tilenum])
                            loadtile(tilenum);

                        if (waloff[tilenum])
                        {
                            // daz-intz > 0 && daz-intz < k
                            int32_t xtex = mulscale16(ucoefup16, tilesizx[tilenum]);
                            int32_t vcoefup16 = 65536-divscale16(daz-intz, k);
                            int32_t ytex = mulscale16(vcoefup16, tilesizy[tilenum]);

                            const char *texel = (char *)(waloff[tilenum] + tilesizy[tilenum]*xtex + ytex);
                            if (*texel == 255)
                                continue;
                        }
                    }

                    hit_set(hit, dasector, -1, z, intx, inty, intz);
                }
                break;
            }

            case 32:
            {
                int32_t x3, y3, x4, y4, zz;

                if (vz == 0) continue;
                intz = z1;
                if (((intz-sv->z)^vz) < 0) continue;
                if ((cstat&64) != 0)
                    if ((sv->z > intz) == ((cstat&8)==0)) continue;
#if 1
                // Abyss crash prevention code ((intz-sv->z)*zx overflowing a 8-bit word)
                // PK: the reason for the crash is not the overflowing (even if it IS a problem;
                // signed overflow is undefined behavior in C), but rather the idiv trap when
                // the resulting quotient doesn't fit into a *signed* 32-bit integer.
                zz = (uint32_t)(intz-sv->z) * vx;
                intx = sv->x+scale(zz,1,vz);
                zz = (uint32_t)(intz-sv->z) * vy;
                inty = sv->y+scale(zz,1,vz);
#else
                intx = sv->x+scale(intz-sv->z,vx,vz);
                inty = sv->y+scale(intz-sv->z,vy,vz);
#endif
                if (klabs(intx-sv->x)+klabs(inty-sv->y) > klabs((hit->pos.x)-sv->x)+klabs((hit->pos.y)-sv->y))
                    continue;

                get_floorspr_points(spr, intx, inty, &x1, &x2, &x3, &x4,
                                   &y1, &y2, &y3, &y4);

                if (get_floorspr_clipyou(x1, x2, x3, x4, y1, y2, y3, y4))
                {
                    hit_set(hit, dasector, -1, z, intx, inty, intz);
                }

                break;
            }
            }
        }
    }
    while (++tempshortcnt < tempshortnum || clipspritecnt < clipspritenum);

#ifdef HAVE_CLIPSHAPE_FEATURE
    if (curspr)
        mapinfo_set(NULL, &origmapinfo);
#endif

#ifdef YAX_ENABLE
    if (numyaxbunches == 0 || editstatus)
        return 0;

    if (hit->sprite==-1 && hit->wall==-1 && hit->sect!=oldhitsect
        && hit->sect != oldhitsect2)  // 'ping-pong' infloop protection
    {
        if (hit->sect == -1 && oldhitsect >= 0)
        {
            // this is bad: we didn't hit anything after going through a ceiling/floor
            Bmemcpy(&hit->pos, &newsv, sizeof(vec3_t));
            hit->sect = oldhitsect;

            return 0;
        }

        // 1st, 2nd, ... ceil/floor hit
        // hit->sect is >=0 because if oldhitsect's init and check above
        if (SECTORFLD(hit->sect,stat, hitscan_hitsectcf)&yax_waltosecmask(dawalclipmask))
            return 0;

        i = yax_getneighborsect(hit->pos.x, hit->pos.y, hit->sect, hitscan_hitsectcf);
        if (i >= 0)
        {
            Bmemcpy(&newsv, &hit->pos, sizeof(vec3_t));
            sectnum = i;
            sv = &newsv;

            oldhitsect2 = oldhitsect;
            oldhitsect = hit->sect;
            hit->sect = -1;

            // sector-like sprite re-init:
            curspr = 0;
            curidx = -1;
            tmpptr = NULL;

            goto restart_grand;
        }
    }
#endif

    return(0);
}


//
// neartag
//
void neartag(int32_t xs, int32_t ys, int32_t zs, int16_t sectnum, int16_t ange, int16_t *neartagsector, int16_t *neartagwall,
             int16_t *neartagsprite, int32_t *neartaghitdist, int32_t neartagrange, uint8_t tagsearch,
             int32_t (*blacklist_sprite_func)(int32_t))
{
    int16_t tempshortcnt, tempshortnum;

    const int32_t vx = mulscale14(sintable[(ange+2560)&2047],neartagrange);
    const int32_t vy = mulscale14(sintable[(ange+2048)&2047],neartagrange);
    vec3_t hitv = { xs+vx, ys+vy, 0 };
    const vec3_t sv = { xs, ys, zs };

    *neartagsector = -1; *neartagwall = -1; *neartagsprite = -1;
    *neartaghitdist = 0;

    if (sectnum < 0 || (tagsearch & 3) == 0)
        return;

    clipsectorlist[0] = sectnum;
    tempshortcnt = 0; tempshortnum = 1;

    do
    {
        const int32_t dasector = clipsectorlist[tempshortcnt];

        const int32_t startwall = sector[dasector].wallptr;
        const int32_t endwall = startwall + sector[dasector].wallnum - 1;
        const walltype *wal;
        int32_t z;

        for (z=startwall,wal=&wall[startwall]; z<=endwall; z++,wal++)
        {
            const walltype *const wal2 = &wall[wal->point2];
            const int32_t nextsector = wal->nextsector;

            const int32_t x1=wal->x, y1=wal->y, x2=wal2->x, y2=wal2->y;
            int32_t intx, inty, intz, good = 0;

            if (nextsector >= 0)
            {
                if ((tagsearch&1) && sector[nextsector].lotag) good |= 1;
                if ((tagsearch&2) && sector[nextsector].hitag) good |= 1;
            }

            if ((tagsearch&1) && wal->lotag) good |= 2;
            if ((tagsearch&2) && wal->hitag) good |= 2;

            if ((good == 0) && (nextsector < 0)) continue;
            if ((int64_t)(x1-xs)*(y2-ys) < (int64_t)(x2-xs)*(y1-ys)) continue;

            if (lintersect(xs,ys,zs,hitv.x,hitv.y,hitv.z,x1,y1,x2,y2,&intx,&inty,&intz) == 1)
            {
                if (good != 0)
                {
                    if (good&1) *neartagsector = nextsector;
                    if (good&2) *neartagwall = z;
                    *neartaghitdist = dmulscale14(intx-xs,sintable[(ange+2560)&2047],inty-ys,sintable[(ange+2048)&2047]);
                    hitv.x = intx; hitv.y = inty; hitv.z = intz;
                }

                if (nextsector >= 0)
                {
                    int32_t zz;
                    for (zz=tempshortnum-1; zz>=0; zz--)
                        if (clipsectorlist[zz] == nextsector) break;
                    if (zz < 0) clipsectorlist[tempshortnum++] = nextsector;
                }
            }
        }

        tempshortcnt++;

        if (tagsearch & 4)
            continue; // skip sprite search

        for (z=headspritesect[dasector]; z>=0; z=nextspritesect[z])
        {
            const spritetype *const spr = &sprite[z];

            if (blacklist_sprite_func && blacklist_sprite_func(z))
                continue;

            if (((tagsearch&1) && spr->lotag) || ((tagsearch&2) && spr->hitag))
            {
                if (try_facespr_intersect(spr, &sv, vx, vy, 0, &hitv, 1))
                {
                    *neartagsprite = z;
                    *neartaghitdist = dmulscale14(hitv.x-xs, sintable[(ange+2560)&2047],
                                                  hitv.y-ys, sintable[(ange+2048)&2047]);
                }
            }
        }
    }
    while (tempshortcnt < tempshortnum);

    return;
}


//
// dragpoint
//
// flags:
//  1: don't reset walbitmap[] (the bitmap of already dragged vertices)
//  2: In the editor, do wall[].cstat |= (1<<14) also for the lastwall().
void dragpoint(int16_t pointhighlight, int32_t dax, int32_t day, uint8_t flags)
#ifdef YAX_ENABLE
{
    int32_t i, numyaxwalls=0;
    static int16_t yaxwalls[MAXWALLS];

    uint8_t *const walbitmap = (uint8_t *)tempbuf;

    if ((flags&1)==0)
        Bmemset(walbitmap, 0, (numwalls+7)>>3);
    yaxwalls[numyaxwalls++] = pointhighlight;

    for (i=0; i<numyaxwalls; i++)
    {
        int32_t clockwise = 0;
        int32_t w = yaxwalls[i];
        const int32_t tmpstartwall = w;

        int32_t cnt = MAXWALLS;

        while (1)
        {
            int32_t j, tmpcf;

            wall[w].x = dax;
            wall[w].y = day;
            walbitmap[w>>3] |= (1<<(w&7));

            for (YAX_ITER_WALLS(w, j, tmpcf))
            {
                if ((walbitmap[j>>3]&(1<<(j&7)))==0)
                {
                    walbitmap[j>>3] |= (1<<(j&7));
                    yaxwalls[numyaxwalls++] = j;
                }
            }

            if (!clockwise)  //search points CCW
            {
                if (wall[w].nextwall >= 0)
                    w = wall[wall[w].nextwall].point2;
                else
                {
                    w = tmpstartwall;
                    clockwise = 1;
                }
            }

            cnt--;
            if (cnt==0)
            {
                initprintf("dragpoint %d: infloop!\n", pointhighlight);
                i = numyaxwalls;
                break;
            }

            if (clockwise)
            {
                int32_t thelastwall = lastwall(w);
                if (wall[thelastwall].nextwall >= 0)
                    w = wall[thelastwall].nextwall;
                else
                    break;
            }

            if ((walbitmap[w>>3] & (1<<(w&7))))
            {
                if (clockwise)
                    break;

                w = tmpstartwall;
                clockwise = 1;
                continue;
            }
        }
    }

    if (editstatus)
    {
        int32_t w;
        // TODO: extern a separate bitmap instead?
        for (w=0; w<numwalls; w++)
            if (walbitmap[w>>3] & (1<<(w&7)))
            {
                wall[w].cstat |= (1<<14);
                if (flags&2)
                    wall[lastwall(w)].cstat |= (1<<14);
            }
    }
}
#else
{
    int16_t cnt, tempshort;
    int32_t thelastwall;

    tempshort = pointhighlight;    //search points CCW
    cnt = MAXWALLS;

    wall[tempshort].x = dax;
    wall[tempshort].y = day;

    if (editstatus)
    {
        wall[pointhighlight].cstat |= (1<<14);
        if (linehighlight >= 0 && linehighlight < MAXWALLS)
            wall[linehighlight].cstat |= (1<<14);
        wall[lastwall(pointhighlight)].cstat |= (1<<14);
    }

    do
    {
        if (wall[tempshort].nextwall >= 0)
        {
            tempshort = wall[wall[tempshort].nextwall].point2;

            wall[tempshort].x = dax;
            wall[tempshort].y = day;
            wall[tempshort].cstat |= (1<<14);
        }
        else
        {
            tempshort = pointhighlight;    //search points CW if not searched all the way around
            do
            {
                thelastwall = lastwall(tempshort);
                if (wall[thelastwall].nextwall >= 0)
                {
                    tempshort = wall[thelastwall].nextwall;
                    wall[tempshort].x = dax;
                    wall[tempshort].y = day;
                    wall[tempshort].cstat |= (1<<14);
                }
                else
                {
                    break;
                }
                cnt--;
            }
            while ((tempshort != pointhighlight) && (cnt > 0));
            break;
        }
        cnt--;
    }
    while ((tempshort != pointhighlight) && (cnt > 0));
}
#endif

//
// lastwall
//
int32_t lastwall(int16_t point)
{
    int32_t i, cnt;

    if (point > 0 && wall[point-1].point2 == point)
        return point-1;

    i = point;
    cnt = MAXWALLS;
    do
    {
        int32_t j = wall[i].point2;
        if (j == point) return(i);
        i = j;
        cnt--;
    }
    while (cnt > 0);

    return(point);
}


////////// CLIPMOVE //////////

static int32_t clipmoveboxtracenum = 3;

#ifdef HAVE_CLIPSHAPE_FEATURE
static int32_t clipsprite_try(const spritetype *spr, int32_t xmin, int32_t ymin, int32_t xmax, int32_t ymax)
{
    // try and see whether this sprite's picnum has sector-like clipping data
    int32_t i = pictoidx[spr->picnum];
    // handle sector-like floor sprites separately
    while (i>=0 && (spr->cstat&32) != (clipmapinfo.sector[sectq[clipinfo[i].qbeg]].CM_CSTAT&32))
        i = clipinfo[i].next;

    if (i>=0)
    {
        int32_t maxcorrection = clipinfo[i].maxdist;
        const int32_t k = sectq[clipinfo[i].qbeg];

        if ((spr->cstat&48)!=32)  // face/wall sprite
        {
            int32_t tempint1 = clipmapinfo.sector[k].CM_XREPEAT;
            maxcorrection = (maxcorrection * (int32_t)spr->xrepeat)/tempint1;
        }
        else  // floor sprite
        {
            int32_t tempint1 = clipmapinfo.sector[k].CM_XREPEAT;
            int32_t tempint2 = clipmapinfo.sector[k].CM_YREPEAT;
            maxcorrection = max((maxcorrection * (int32_t)spr->xrepeat)/tempint1,
                                (maxcorrection * (int32_t)spr->yrepeat)/tempint2);
        }

        maxcorrection -= MAXCLIPDIST;

        if (spr->x < xmin - maxcorrection) return 1;
        if (spr->y < ymin - maxcorrection) return 1;
        if (spr->x > xmax + maxcorrection) return 1;
        if (spr->y > ymax + maxcorrection) return 1;

        if (clipspritenum < MAXCLIPNUM)
            clipspritelist[clipspritenum++] = spr-sprite;
//initprintf("%d: clip sprite[%d]\n",clipspritenum,j);
        return 1;
    }

    return 0;
}

// return: -1 if curspr has x-flip xor y-flip (in the horizontal map plane!), 1 else
static int32_t clipsprite_initindex(int32_t curidx, spritetype *curspr, int32_t *clipsectcnt, const vec3_t *vect)
{
    int32_t k, daz = curspr->z;
    int32_t scalex, scaley, scalez, flipx, flipy;
    int32_t flipmul=1;

    const int32_t j = sectq[clipinfo[curidx].qbeg];
    const int32_t tempint1 = sector[j].CM_XREPEAT;
    const int32_t tempint2 = sector[j].CM_YREPEAT;

    const int32_t rotang = (curspr->ang - sector[j].CM_ANG)&2047;
    const int32_t dorot = !CM_NOROTS(j);

    if ((curspr->cstat&48)!=32)  // face/wall sprite
    {
        scalex = scaley = divscale22(curspr->xrepeat, tempint1);
        scalez = divscale22(curspr->yrepeat, tempint2);

        flipx = 1-((curspr->cstat&4)>>1);
        flipy = 1;
    }
    else
    {
        scalex = divscale22(curspr->xrepeat, tempint1);
        scaley = divscale22(curspr->yrepeat, tempint2);
        scalez = scalex;

        flipx = 1-((curspr->cstat&4)>>1);
        flipy = 1-((curspr->cstat&8)>>2);
    }

    if (dorot)
    {
        flipmul = flipx*flipy;
        if (flipmul==-1)
            wall = loadwallinv;
    }

    if ((curspr->cstat&128) != (sector[j].CM_CSTAT&128))
        daz += (((curspr->cstat&128)>>6)-1)*((tilesizy[curspr->picnum]*curspr->yrepeat)<<1);

    *clipsectcnt = clipsectnum = 0;
    // init sectors for this index
    for (k=clipinfo[curidx].qbeg; k<=clipinfo[curidx].qend; k++)
    {
        const int32_t j = sectq[k];
        sectortype *const sec = &sector[j];
        const int32_t startwall = sec->wallptr, endwall = startwall+sec->wallnum;

        int32_t w;
        walltype *wal;

        sec->floorz = daz + mulscale22(scalez, CM_FLOORZ(j));
        sec->ceilingz = daz + mulscale22(scalez, CM_CEILINGZ(j));
//initprintf("sec %d: f=%d, c=%d\n", j, sec->floorz, sec->ceilingz);

        for (w=startwall,wal=&wall[startwall]; w<endwall; w++,wal++)
        {
            wal->x = mulscale22(scalex, CM_WALL_X(w));
            wal->y = mulscale22(scaley, CM_WALL_Y(w));

            if (dorot)
            {
                wal->x *= flipx;
                wal->y *= flipy;
                rotatepoint(0,0, wal->x,wal->y, rotang, &wal->x,&wal->y);
            }

            wal->x += curspr->x;
            wal->y += curspr->y;
        }

        if (inside(vect->x, vect->y, j)==1)
            clipsectorlist[clipsectnum++] = j;
    }

    // add outer sector if not inside inner ones
    if (clipsectnum==0)
        clipsectorlist[clipsectnum++] = sectq[k-1];

    return flipmul;
}
#endif

static int32_t clipmove_warned=0;

static void addclipline(int32_t dax1, int32_t day1, int32_t dax2, int32_t day2, int32_t daoval)
{
    if (clipnum < MAXCLIPNUM)
    {
        clipit[clipnum].x1 = dax1; clipit[clipnum].y1 = day1;
        clipit[clipnum].x2 = dax2; clipit[clipnum].y2 = day2;
        clipobjectval[clipnum] = daoval;
        clipnum++;
    }
    else if (!clipmove_warned)
    {
        initprintf("!!clipnum\n");
        clipmove_warned = 1;
    }
}

int32_t clipmovex(vec3_t *pos, int16_t *sectnum,
                  int32_t xvect, int32_t yvect,
                  int32_t walldist, int32_t ceildist, int32_t flordist, uint32_t cliptype,
                  uint8_t noslidep)
{
    int32_t ret;
    const int32_t oboxtracenum = clipmoveboxtracenum;

    if (noslidep)
        clipmoveboxtracenum = 1;
    ret = clipmove(pos, sectnum, xvect, yvect,
                   walldist, ceildist, flordist, cliptype);
    clipmoveboxtracenum = oboxtracenum;

    return ret;
}

//
// clipmove
//
int32_t clipmove(vec3_t *pos, int16_t *sectnum,
                 int32_t xvect, int32_t yvect,
                 int32_t walldist, int32_t ceildist, int32_t flordist, uint32_t cliptype)
{
    const sectortype *sec2;
    int32_t i, j, k, tempint1, tempint2;
    int32_t x1, y1, x2, y2;
    int32_t dax, day;
    int32_t hitwall, cnt, retval=0;

    spritetype *curspr=NULL;  // non-NULL when handling sprite with sector-like clipping
    int32_t curidx=-1, clipsectcnt, clipspritecnt;

    const int32_t dawalclipmask = (cliptype&65535);        //CLIPMASK0 = 0x00010001
    const int32_t dasprclipmask = (cliptype>>16);          //CLIPMASK1 = 0x01000040

    const int32_t oxvect=xvect, oyvect=yvect;

    int32_t goalx = pos->x + (xvect>>14);
    int32_t goaly = pos->y + (yvect>>14);
    const int32_t cx = (pos->x+goalx)>>1;
    const int32_t cy = (pos->y+goaly)>>1;

    //Extra walldist for sprites on sector lines
    const int32_t gx=goalx-(pos->x), gy=goaly-(pos->y);
    const int32_t rad = nsqrtasm(uhypsq(gx,gy)) + MAXCLIPDIST+walldist + 8;
    const int32_t xmin = cx-rad, ymin = cy-rad;
    const int32_t xmax = cx+rad, ymax = cy+rad;

    if ((xvect|yvect) == 0 || *sectnum < 0)
        return 0;

    clipmove_warned = 0;
    clipnum = 0;

    clipsectorlist[0] = (*sectnum);
    clipsectcnt = 0; clipsectnum = 1;
    clipspritecnt = 0; clipspritenum = 0;
    do
    {
        const walltype *wal;
        const sectortype *sec;
        int32_t dasect, startwall, endwall;

#ifdef HAVE_CLIPSHAPE_FEATURE
        if (clipsectcnt>=clipsectnum)
        {
            // one bunch of sectors completed (either the very first
            // one or a sector-like sprite one), prepare the next

//initprintf("init sprite %d\n", clipspritecnt);
            if (!curspr)
            {
                // init sector-like sprites for clipping
                origclipsectnum = clipsectnum;
                Bmemcpy(origclipsectorlist, clipsectorlist, clipsectnum*sizeof(clipsectorlist[0]));

                // replace sector and wall with clip map
                mapinfo_set(&origmapinfo, &clipmapinfo);
            }

            curspr = &sprite[clipspritelist[clipspritecnt]];

            if (curidx < 0)  // per-sprite init
                curidx = pictoidx[curspr->picnum];
            else
                curidx = clipinfo[curidx].next;

            while (curidx>=0 && (curspr->cstat&32) != (sector[sectq[clipinfo[curidx].qbeg]].CM_CSTAT&32))
                curidx = clipinfo[curidx].next;

            if (curidx < 0)
            {
                clipspritecnt++;
                continue;
            }

            clipsprite_initindex(curidx, curspr, &clipsectcnt, pos);
        }
#endif

        dasect = clipsectorlist[clipsectcnt++];
//if (curspr)
//    initprintf("sprite %d/%d: sect %d/%d (%d)\n", clipspritecnt,clipspritenum, clipsectcnt,clipsectnum,dasect);

        ////////// Walls //////////

        sec = &sector[dasect];
        startwall = sec->wallptr; endwall = startwall + sec->wallnum;
        for (j=startwall,wal=&wall[startwall]; j<endwall; j++,wal++)
        {
            int32_t clipyou = 0, dx, dy;
            const walltype *const wal2 = &wall[wal->point2];

            if (wal->x < xmin && wal2->x < xmin) continue;
            if (wal->x > xmax && wal2->x > xmax) continue;
            if (wal->y < ymin && wal2->y < ymin) continue;
            if (wal->y > ymax && wal2->y > ymax) continue;

            x1 = wal->x; y1 = wal->y; x2 = wal2->x; y2 = wal2->y;

            dx = x2-x1; dy = y2-y1;
            if (dx*((pos->y)-y1) < ((pos->x)-x1)*dy) continue;  //If wall's not facing you

            if (dx > 0) dax = dx*(ymin-y1); else dax = dx*(ymax-y1);
            if (dy > 0) day = dy*(xmax-x1); else day = dy*(xmin-x1);
            if (dax >= day) continue;

#ifdef HAVE_CLIPSHAPE_FEATURE
            if (curspr)
            {
                if (wal->nextsector>=0)
                {
                    int32_t basez, daz, daz2;

                    if (rintersect(pos->x,pos->y,0, gx,gy,0, x1,y1, x2,y2, &dax,&day,&daz) == -1)
                        dax = pos->x, day = pos->y;

                    daz = getflorzofslope(dasect, dax,day);
                    daz2 = getflorzofslope(wal->nextsector, dax,day);
                    basez = getflorzofslope(sectq[clipinfo[curidx].qend], dax,day);

                    sec2 = &sector[wal->nextsector];
                    if ((sec2->floorstat&1) == 0)
//                        if (dasect==sectq[clipinfo[curidx].qend] || daz2 < daz-(1<<8))
                        if (daz2-(flordist-1) <= pos->z && pos->z <= basez+(flordist-1))
                            clipyou = 1;

                    if (clipyou == 0)
                    {
                        daz = getceilzofslope(dasect, dax,day);
                        daz2 = getceilzofslope(wal->nextsector, dax,day);
                        basez = getceilzofslope(sectq[clipinfo[curidx].qend], dax,day);

                        if ((sec2->ceilingstat&1) == 0)
//                            if (dasect==sectq[clipinfo[curidx].qend] || daz2 > daz+(1<<8))
                            if (basez-(ceildist-1) <= pos->z && pos->z <= daz2+(ceildist-1))
                                clipyou = 1;
                    }
                }
            }
            else
#endif
            if (wal->nextsector < 0 || (wal->cstat&dawalclipmask))
            {
                clipyou = 1;
            }
            else if (editstatus == 0)
            {
                int32_t daz, daz2;

                if (rintersect(pos->x,pos->y,0,gx,gy,0,x1,y1,x2,y2,&dax,&day,&daz) == -1)
                    dax = pos->x, day = pos->y;

                daz = getflorzofslope(dasect, dax,day);
                daz2 = getflorzofslope(wal->nextsector, dax,day);

                sec2 = &sector[wal->nextsector];
                if (daz2 < daz-(1<<8))
                    if ((sec2->floorstat&1) == 0)
                        if (pos->z >= daz2-(flordist-1))
                            clipyou = 1;

                if (clipyou == 0)
                {
                    daz = getceilzofslope(dasect, dax,day);
                    daz2 = getceilzofslope(wal->nextsector, dax,day);

                    if (daz2 > daz+(1<<8))
                        if ((sec2->ceilingstat&1) == 0)
                            if (pos->z <= daz2+(ceildist-1))
                                clipyou = 1;
                }
            }

            if (clipyou)
            {
                int16_t objtype;
                int32_t bsz;

                if (!curspr)
                    objtype = (int16_t)j+32768;
                else
                    objtype = (int16_t)(curspr-sprite)+49152;

                //Add 2 boxes at endpoints
                bsz = walldist; if (gx < 0) bsz = -bsz;
                addclipline(x1-bsz,y1-bsz, x1-bsz,y1+bsz, objtype);
                addclipline(x2-bsz,y2-bsz, x2-bsz,y2+bsz, objtype);
                bsz = walldist; if (gy < 0) bsz = -bsz;
                addclipline(x1+bsz,y1-bsz, x1-bsz,y1-bsz, objtype);
                addclipline(x2+bsz,y2-bsz, x2-bsz,y2-bsz, objtype);

                dax = walldist; if (dy > 0) dax = -dax;
                day = walldist; if (dx < 0) day = -day;
                addclipline(x1+dax,y1+day, x2+dax,y2+day, objtype);
            }
            else if (wal->nextsector>=0)
            {
                for (i=clipsectnum-1; i>=0; i--)
                    if (wal->nextsector == clipsectorlist[i]) break;
                if (i < 0) clipsectorlist[clipsectnum++] = wal->nextsector;
            }
        }

        ////////// Sprites //////////

        if (dasprclipmask==0)
            continue;

#ifdef HAVE_CLIPSHAPE_FEATURE
        if (curspr)
            continue;  // next sector of this index
#endif
        for (j=headspritesect[dasect]; j>=0; j=nextspritesect[j])
        {
            const spritetype *const spr = &sprite[j];
            const int32_t cstat = spr->cstat;

            if ((cstat&dasprclipmask) == 0)
                continue;

#ifdef HAVE_CLIPSHAPE_FEATURE
            if (clipsprite_try(spr, xmin,ymin, xmax,ymax))
                continue;
#endif
            x1 = spr->x; y1 = spr->y;

            switch (cstat&48)
            {
            case 0:
                if (x1 >= xmin && x1 <= xmax && y1 >= ymin && y1 <= ymax)
                {
                    const int32_t daz = spr->z + spriteheightofs(j, &k, 1);

                    if ((pos->z < daz+ceildist) && (pos->z > daz-k-flordist))
                    {
                        int32_t bsz;
                        bsz = (spr->clipdist<<2)+walldist; if (gx < 0) bsz = -bsz;
                        addclipline(x1-bsz,y1-bsz,x1-bsz,y1+bsz,(int16_t)j+49152);
                        bsz = (spr->clipdist<<2)+walldist; if (gy < 0) bsz = -bsz;
                        addclipline(x1+bsz,y1-bsz,x1-bsz,y1-bsz,(int16_t)j+49152);
                    }
                }
                break;

            case 16:
            {
                const int32_t daz = spr->z + spriteheightofs(j, &k, 1) + ceildist;
                const int32_t daz2 = daz-k - flordist;

                if (pos->z < daz && pos->z > daz2)
                {
                    get_wallspr_points(spr, &x1, &x2, &y1, &y2);

                    if (clipinsideboxline(cx,cy,x1,y1,x2,y2,rad) != 0)
                    {
                        dax = mulscale14(sintable[(spr->ang+256+512)&2047],walldist);
                        day = mulscale14(sintable[(spr->ang+256)&2047],walldist);

                        if ((x1-(pos->x))*(y2-(pos->y)) >= (x2-(pos->x))*(y1-(pos->y)))   //Front
                        {
                            addclipline(x1+dax,y1+day,x2+day,y2-dax,(int16_t)j+49152);
                        }
                        else
                        {
                            if ((cstat&64) != 0) continue;
                            addclipline(x2-dax,y2-day,x1-day,y1+dax,(int16_t)j+49152);
                        }

                        //Side blocker
                        if ((x2-x1)*((pos->x)-x1) + (y2-y1)*((pos->y)-y1) < 0)
                            addclipline(x1-day,y1+dax,x1+dax,y1+day,(int16_t)j+49152); 
                        else if ((x1-x2)*((pos->x)-x2) + (y1-y2)*((pos->y)-y2) < 0)
                            addclipline(x2+day,y2-dax,x2-dax,y2-day,(int16_t)j+49152);
                    }
                }
                break;
            }

            case 32:
            {
                const int32_t daz = spr->z + ceildist;
                const int32_t daz2 = spr->z - flordist;

                if (pos->z < daz && pos->z > daz2)
                {
                    if ((cstat&64) != 0)
                        if ((pos->z > spr->z) == ((cstat&8)==0))
                            continue;

                    rxi[0] = x1;
                    rxi[1] = y1;
                    get_floorspr_points(spr, 0, 0, &rxi[0], &rxi[1], &rxi[2], &rxi[3],
                                       &ryi[0], &ryi[1], &ryi[2], &ryi[3]);

                    dax = mulscale14(sintable[(spr->ang-256+512)&2047],walldist);
                    day = mulscale14(sintable[(spr->ang-256)&2047],walldist);

                    if ((rxi[0]-(pos->x))*(ryi[1]-(pos->y)) < (rxi[1]-(pos->x))*(ryi[0]-(pos->y)))
                    {
                        if (clipinsideboxline(cx,cy,rxi[1],ryi[1],rxi[0],ryi[0],rad) != 0)
                            addclipline(rxi[1]-day,ryi[1]+dax,rxi[0]+dax,ryi[0]+day,(int16_t)j+49152);
                    }
                    else if ((rxi[2]-(pos->x))*(ryi[3]-(pos->y)) < (rxi[3]-(pos->x))*(ryi[2]-(pos->y)))
                    {
                        if (clipinsideboxline(cx,cy,rxi[3],ryi[3],rxi[2],ryi[2],rad) != 0)
                            addclipline(rxi[3]+day,ryi[3]-dax,rxi[2]-dax,ryi[2]-day,(int16_t)j+49152);
                    }

                    if ((rxi[1]-(pos->x))*(ryi[2]-(pos->y)) < (rxi[2]-(pos->x))*(ryi[1]-(pos->y)))
                    {
                        if (clipinsideboxline(cx,cy,rxi[2],ryi[2],rxi[1],ryi[1],rad) != 0)
                            addclipline(rxi[2]-dax,ryi[2]-day,rxi[1]-day,ryi[1]+dax,(int16_t)j+49152);
                    }
                    else if ((rxi[3]-(pos->x))*(ryi[0]-(pos->y)) < (rxi[0]-(pos->x))*(ryi[3]-(pos->y)))
                    {
                        if (clipinsideboxline(cx,cy,rxi[0],ryi[0],rxi[3],ryi[3],rad) != 0)
                            addclipline(rxi[0]+dax,ryi[0]+day,rxi[3]+day,ryi[3]-dax,(int16_t)j+49152);
                    }
                }
                break;
            }
            }
        }
    }
    while (clipsectcnt < clipsectnum || clipspritecnt < clipspritenum);

#ifdef HAVE_CLIPSHAPE_FEATURE
    if (curspr)
    {
        // restore original map
        mapinfo_set(NULL, &origmapinfo);

        clipsectnum = origclipsectnum;
        Bmemcpy(clipsectorlist, origclipsectorlist, clipsectnum*sizeof(clipsectorlist[0]));
    }
#endif

    hitwall = 0;
    cnt = clipmoveboxtracenum;
    do
    {
        int32_t intx=goalx, inty=goaly;

        hitwall = raytrace(pos->x, pos->y, &intx, &inty);
        if (hitwall >= 0)
        {
            const int32_t lx = clipit[hitwall].x2-clipit[hitwall].x1;
            const int32_t ly = clipit[hitwall].y2-clipit[hitwall].y1;
            const uint64_t tempull = (int64_t)lx*(int64_t)lx + (int64_t)ly*(int64_t)ly;

            if (tempull > 0 && tempull < INT32_MAX)
            {
                tempint2 = (int32_t)tempull;

                tempint1 = (goalx-intx)*lx + (goaly-inty)*ly;

                if ((klabs(tempint1)>>11) < tempint2)
                    i = divscale20(tempint1,tempint2);
                else
                    i = 0;
                goalx = mulscale20(lx,i)+intx;
                goaly = mulscale20(ly,i)+inty;
            }

            tempint1 = dmulscale6(lx,oxvect,ly,oyvect);
            for (i=cnt+1; i<=clipmoveboxtracenum; i++)
            {
                j = hitwalls[i];
                tempint2 = dmulscale6(clipit[j].x2-clipit[j].x1, oxvect,
                                      clipit[j].y2-clipit[j].y1, oyvect);
                if ((tempint1^tempint2) < 0)
                {
                    updatesector(pos->x,pos->y,sectnum);
                    return retval;
                }
            }

            keepaway(&goalx, &goaly, hitwall);
            xvect = (goalx-intx)<<14;
            yvect = (goaly-inty)<<14;

            if (cnt == clipmoveboxtracenum) retval = clipobjectval[hitwall];
            hitwalls[cnt] = hitwall;
        }
        cnt--;

        pos->x = intx;
        pos->y = inty;
    }
    while ((xvect|yvect) != 0 && hitwall >= 0 && cnt > 0);

    for (j=0; j<clipsectnum; j++)
        if (inside(pos->x,pos->y,clipsectorlist[j]) == 1)
        {
            *sectnum = clipsectorlist[j];
            return retval;
        }

    *sectnum = -1; tempint1 = INT32_MAX;
    for (j=numsectors-1; j>=0; j--)
        if (inside(pos->x,pos->y,j) == 1)
        {
            if (sector[j].ceilingstat&2)
                tempint2 = getceilzofslope(j, pos->x, pos->y) - pos->z;
            else
                tempint2 = sector[j].ceilingz - pos->z;

            if (tempint2 > 0)
            {
                if (tempint2 < tempint1)
                    { *sectnum = j; tempint1 = tempint2; }
            }
            else
            {
                if (sector[j].floorstat&2)
                    tempint2 = pos->z - getflorzofslope(j, pos->x, pos->y);
                else
                    tempint2 = pos->z - sector[j].floorz;

                if (tempint2 <= 0)
                {
                    *sectnum = j;
                    return retval;
                }
                if (tempint2 < tempint1)
                    { *sectnum = j; tempint1 = tempint2; }
            }
        }

    return retval;
}


//
// pushmove
//
int32_t pushmove(vec3_t *vect, int16_t *sectnum,
                 int32_t walldist, int32_t ceildist, int32_t flordist, uint32_t cliptype)
{
    int32_t i, j, k, t, dx, dy, dax, day, daz;
    int32_t dir, bad, bad2;

    const int32_t dawalclipmask = (cliptype&65535);
//    const int32_t dasprclipmask = (cliptype>>16);

    if (*sectnum < 0)
        return -1;

    k = 32;
    dir = 1;
    do
    {
        int32_t clipsectcnt;

        bad = 0;

        clipsectorlist[0] = *sectnum;
        clipsectcnt = 0; clipsectnum = 1;
        do
        {
            const walltype *wal;
            const sectortype *sec;
            int32_t startwall, endwall;
#if 0
            // Push FACE sprites
            for(i=headspritesect[clipsectorlist[clipsectcnt]];i>=0;i=nextspritesect[i])
            {
                spr = &sprite[i];
                if (((spr->cstat&48) != 0) && ((spr->cstat&48) != 48)) continue;
                if ((spr->cstat&dasprclipmask) == 0) continue;

                dax = (vect->x)-spr->x; day = (vect->y)-spr->y;
                t = (spr->clipdist<<2)+walldist;
                if ((klabs(dax) < t) && (klabs(day) < t))
                {
                    daz = spr->z + spriteheightofs(i, &t, 1);
                    if (((vect->z) < daz+ceildist) && ((vect->z) > daz-t-flordist))
                    {
                        t = (spr->clipdist<<2)+walldist;

                        j = getangle(dax,day);
                        dx = (sintable[(j+512)&2047]>>11);
                        dy = (sintable[(j)&2047]>>11);
                        bad2 = 16;
                        do
                        {
                            vect->x = (vect->x) + dx; vect->y = (vect->y) + dy;
                            bad2--; if (bad2 == 0) break;
                        } while ((klabs((vect->x)-spr->x) < t) && (klabs((vect->y)-spr->y) < t));
                        bad = -1;
                        k--; if (k <= 0) return(bad);
                        updatesector(vect->x,vect->y,sectnum);
                    }
                }
            }
#endif
            sec = &sector[clipsectorlist[clipsectcnt]];
            if (dir > 0)
                startwall = sec->wallptr, endwall = startwall + sec->wallnum;
            else
                endwall = sec->wallptr, startwall = endwall + sec->wallnum;

            for (i=startwall,wal=&wall[startwall]; i!=endwall; i+=dir,wal+=dir)
                if (clipinsidebox(vect->x,vect->y,i,walldist-4) == 1)
                {
                    j = 0;
                    if (wal->nextsector < 0) j = 1;
                    if (wal->cstat&dawalclipmask) j = 1;
                    if (j == 0)
                    {
                        const sectortype *const sec2 = &sector[wal->nextsector];
                        int32_t daz2;

                        //Find closest point on wall (dax, day) to (vect->x, vect->y)
                        dax = wall[wal->point2].x-wal->x;
                        day = wall[wal->point2].y-wal->y;
                        daz = dax*((vect->x)-wal->x) + day*((vect->y)-wal->y);
                        if (daz <= 0)
                            t = 0;
                        else
                        {
                            daz2 = dax*dax+day*day;
                            if (daz >= daz2) t = (1<<30); else t = divscale30(daz,daz2);
                        }
                        dax = wal->x + mulscale30(dax,t);
                        day = wal->y + mulscale30(day,t);


                        daz = getflorzofslope(clipsectorlist[clipsectcnt],dax,day);
                        daz2 = getflorzofslope(wal->nextsector,dax,day);
                        if ((daz2 < daz-(1<<8)) && ((sec2->floorstat&1) == 0))
                            if (vect->z >= daz2-(flordist-1)) j = 1;

                        daz = getceilzofslope(clipsectorlist[clipsectcnt],dax,day);
                        daz2 = getceilzofslope(wal->nextsector,dax,day);
                        if ((daz2 > daz+(1<<8)) && ((sec2->ceilingstat&1) == 0))
                            if (vect->z <= daz2+(ceildist-1)) j = 1;
                    }

                    if (j != 0)
                    {
                        j = getangle(wall[wal->point2].x-wal->x,wall[wal->point2].y-wal->y);
                        dx = (sintable[(j+1024)&2047]>>11);
                        dy = (sintable[(j+512)&2047]>>11);
                        bad2 = 16;
                        do
                        {
                            vect->x = (vect->x) + dx; vect->y = (vect->y) + dy;
                            bad2--; if (bad2 == 0) break;
                        }
                        while (clipinsidebox(vect->x,vect->y,i,walldist-4) != 0);
                        bad = -1;
                        k--; if (k <= 0) return(bad);
                        updatesector(vect->x,vect->y,sectnum);
                        if (*sectnum < 0) return -1;
                    }
                    else
                    {
                        for (j=clipsectnum-1; j>=0; j--)
                            if (wal->nextsector == clipsectorlist[j]) break;
                        if (j < 0) clipsectorlist[clipsectnum++] = wal->nextsector;
                    }
                }

            clipsectcnt++;
        }
        while (clipsectcnt < clipsectnum);
        dir = -dir;
    }
    while (bad != 0);

    return(bad);
}


// breadth-first search helpers
void bfirst_search_init(int16_t *list, uint8_t *bitmap, int32_t *eltnumptr, int32_t maxnum, int16_t firstelt)
{
    Bmemset(bitmap, 0, (maxnum+7)>>3);

    list[0] = firstelt;
    bitmap[firstelt>>3] |= (1<<(firstelt&7));
    *eltnumptr = 1;
}

void bfirst_search_try(int16_t *list, uint8_t *bitmap, int32_t *eltnumptr, int16_t elt)
{
    if (elt < 0)
        return;

    if ((bitmap[elt>>3]&(1<<(elt&7)))==0)
    {
        bitmap[elt>>3] |= (1<<(elt&7));
        list[*eltnumptr] = elt;
        (*eltnumptr)++;
    }
}

////////// UPDATESECTOR* FAMILY OF FUNCTIONS //////////

/* Different "is inside" predicates.
 * NOTE: The redundant bound checks are expected to be optimized away in the
 * inlined code. */
static inline int32_t inside_p(int32_t x, int32_t y, int16_t sectnum)
{
    return (sectnum>=0 && inside(x, y, sectnum) == 1);
}

static inline int32_t inside_exclude_p(int32_t x, int32_t y, int16_t i, const uint8_t *excludesectbitmap)
{
    return (i>=0 && !(excludesectbitmap[i>>3]&(1<<(i&7))) && inside_p(x, y, i));
}

/* NOTE: no bound check */
static inline int32_t inside_z_p(int32_t x, int32_t y, int32_t z, int16_t i)
{
    int32_t cz, fz;
    getzsofslope(i, x, y, &cz, &fz);
    return (z >= cz && z <= fz && inside_p(x, y, i));
}

#define SET_AND_RETURN(Lval, Rval) do \
{ \
    (Lval) = (Rval); \
    return; \
} while (0)


//
// updatesector[z]
//
void updatesector(int32_t x, int32_t y, int16_t *sectnum)
{
    int32_t i;

    if (inside_p(x,y,*sectnum))
        return;

    if (*sectnum >= 0 && *sectnum < numsectors)
    {
        const walltype *wal = &wall[sector[*sectnum].wallptr];
        int32_t j = sector[*sectnum].wallnum;

        do
        {
            i = wal->nextsector;
            if (inside_p(x, y, i))
                SET_AND_RETURN(*sectnum, i);

            wal++; j--;
        }
        while (j != 0);
    }

    for (i=numsectors-1; i>=0; i--)
        if (inside_p(x, y, i))
            SET_AND_RETURN(*sectnum, i);

    *sectnum = -1;
}

void updatesectorbreadth(int32_t x, int32_t y, int16_t *sectnum)
{
    static int16_t sectlist[MAXSECTORS];
    static uint8_t sectbitmap[MAXSECTORS>>3];
    int32_t nsecs, sectcnt, j;

    if ((unsigned)(*sectnum) >= (unsigned)numsectors)
        return;

    bfirst_search_init(sectlist, sectbitmap, &nsecs, numsectors, *sectnum);

    for (sectcnt=0; sectcnt<nsecs; sectcnt++)
    {
        if (inside_p(x,y, sectlist[sectcnt]))
            SET_AND_RETURN(*sectnum, sectlist[sectcnt]);

        {
            const sectortype *sec = &sector[sectlist[sectcnt]];
            int32_t startwall = sec->wallptr;
            int32_t endwall = sec->wallptr + sec->wallnum;

            for (j=startwall; j<endwall; j++)
                if (wall[j].nextsector >= 0)
                    bfirst_search_try(sectlist, sectbitmap, &nsecs, wall[j].nextsector);
        }
    }

    *sectnum = -1;
}

void updatesectorexclude(int32_t x, int32_t y, int16_t *sectnum, const uint8_t *excludesectbitmap)
{
    int32_t i;

    if (inside_exclude_p(x, y, *sectnum, excludesectbitmap))
        return;

    if (*sectnum >= 0 && *sectnum < numsectors)
    {
        const walltype *wal = &wall[sector[*sectnum].wallptr];
        int32_t j = sector[*sectnum].wallnum;

        do
        {
            i = wal->nextsector;
            if (inside_exclude_p(x, y, i, excludesectbitmap))
                SET_AND_RETURN(*sectnum, i);

            wal++; j--;
        }
        while (j != 0);
    }

    for (i=numsectors-1; i>=0; i--)
        if (inside_exclude_p(x, y, i, excludesectbitmap))
            SET_AND_RETURN(*sectnum, i);

    *sectnum = -1;
}

// new: if *sectnum >= MAXSECTORS, *sectnum-=MAXSECTORS is considered instead
//      as starting sector and the 'initial' z check is skipped
//      (not initial anymore because it follows the sector updating due to TROR)
void updatesectorz(int32_t x, int32_t y, int32_t z, int16_t *sectnum)
{
    int32_t i;

    if ((uint32_t)(*sectnum) < 2*MAXSECTORS)
    {
        const walltype *wal;
        int32_t j, cz, fz;

        int32_t nofirstzcheck = 0;

        if (*sectnum >= MAXSECTORS)
        {
            *sectnum -= MAXSECTORS;
            nofirstzcheck = 1;
        }

        // this block used to be outside the "if" and caused crashes in Polymost Mapster32
        getzsofslope(*sectnum, x, y, &cz, &fz);

#ifdef YAX_ENABLE
        if (z < cz)
        {
            i = yax_getneighborsect(x, y, *sectnum, YAX_CEILING);
            if (i >= 0 && z >= getceilzofslope(i, x, y))
                SET_AND_RETURN(*sectnum, i);
        }

        if (z > fz)
        {
            i = yax_getneighborsect(x, y, *sectnum, YAX_FLOOR);
            if (i >= 0 && z <= getflorzofslope(i, x, y))
                SET_AND_RETURN(*sectnum, i);
        }
#endif
        if (nofirstzcheck || (z >= cz && z <= fz))
            if (inside_p(x, y, *sectnum))
                return;

        wal = &wall[sector[*sectnum].wallptr];
        j = sector[*sectnum].wallnum;
        do
        {
            // YAX: TODO: check neighboring sectors here too?
            i = wal->nextsector;
            if (i>=0 && inside_z_p(x,y,z, i))
                SET_AND_RETURN(*sectnum, i);

            wal++; j--;
        }
        while (j != 0);
    }

    for (i=numsectors-1; i>=0; i--)
        if (inside_z_p(x,y,z, i))
            SET_AND_RETURN(*sectnum, i);

    *sectnum = -1;
}


//
// rotatepoint
//
void rotatepoint(int32_t xpivot, int32_t ypivot, int32_t x, int32_t y, int16_t daang, int32_t *x2, int32_t *y2)
{
    int32_t dacos, dasin;

    dacos = sintable[(daang+2560)&2047];
    dasin = sintable[(daang+2048)&2047];
    x -= xpivot;
    y -= ypivot;
    *x2 = dmulscale14(x,dacos,-y,dasin) + xpivot;
    *y2 = dmulscale14(y,dacos,x,dasin) + ypivot;
}


//
// getmousevalues
//

void getmousevalues(int32_t *mousx, int32_t *mousy, int32_t *bstatus)
{
    readmousexy(mousx,mousy);
    readmousebstatus(bstatus);
}


#if KRANDDEBUG
# include <execinfo.h>
# define KRD_MAXCALLS 262144
# define KRD_DEPTH 8
static int32_t krd_numcalls=0;
static void *krd_fromwhere[KRD_MAXCALLS][KRD_DEPTH];
static int32_t krd_enabled=0;

void krd_enable(int which)  // 0: disable, 1: rec, 2: play
{
    krd_enabled = which;

    if (which)
        Bmemset(krd_fromwhere, 0, sizeof(krd_fromwhere));
}

int32_t krd_print(const char *filename)
{
    FILE *fp;
    int32_t i, j;

    if (!krd_enabled) return 1;
    krd_enabled = 0;

    fp = fopen(filename, "wb");
    if (!fp) { OSD_Printf("krd_print (2): fopen"); return 1; }

    for (i=0; i<krd_numcalls; i++)
    {
        for (j=1;; j++)  // skip self entry
        {
            if (j>=KRD_DEPTH || krd_fromwhere[i][j]==NULL)
            {
                fprintf(fp, "\n");
                break;
            }
            fprintf(fp, " [%p]", krd_fromwhere[i][j]);
        }
    }

    krd_numcalls = 0;

    fclose(fp);
    return 0;
}
#endif  // KRANDDEBUG


//
// krand
//
int32_t krand(void)
{
//    randomseed = (randomseed*27584621)+1;
    randomseed = (randomseed * 1664525ul) + 221297ul;

#if KRANDDEBUG
    if (krd_enabled)
        if (krd_numcalls < KRD_MAXCALLS)
        {
            backtrace(krd_fromwhere[krd_numcalls], KRD_DEPTH);
            krd_numcalls++;
        }
#endif

    return ((uint32_t)randomseed)>>16;
}


//
// getzrange
//
void getzrange(const vec3_t *pos, int16_t sectnum,
               int32_t *ceilz, int32_t *ceilhit, int32_t *florz, int32_t *florhit,
               int32_t walldist, uint32_t cliptype)
{
    int32_t clipsectcnt;
    int32_t dax, day, daz, daz2;
    int32_t i, j, k, dx, dy;
    int32_t x1, y1, x2, y2;

#ifdef YAX_ENABLE
    // YAX round, -1:center, 0:ceiling, 1:floor
    int32_t mcf=-1;
#endif

    spritetype *curspr=NULL;  // non-NULL when handling sprite with sector-like clipping
    int32_t curidx=-1, clipspritecnt;

    //Extra walldist for sprites on sector lines
    const int32_t extradist = walldist+MAXCLIPDIST+1;
    const int32_t xmin = pos->x-extradist, ymin = pos->y-extradist;
    const int32_t xmax = pos->x+extradist, ymax = pos->y+extradist;

    const int32_t dawalclipmask = (cliptype&65535);
    const int32_t dasprclipmask = (cliptype>>16);

    if (sectnum < 0)
    {
        *ceilz = INT32_MIN; *ceilhit = -1;
        *florz = INT32_MAX; *florhit = -1;
        return;
    }

    getzsofslope(sectnum,pos->x,pos->y,ceilz,florz);
    *ceilhit = sectnum+16384; *florhit = sectnum+16384;

#ifdef YAX_ENABLE
    origclipsectorlist[0] = sectnum;
    origclipsectnum = 1;
#endif
    clipsectorlist[0] = sectnum;
    clipsectcnt = 0; clipsectnum = 1;
    clipspritecnt = clipspritenum = 0;

#ifdef HAVE_CLIPSHAPE_FEATURE
    if (0)
    {
beginagain:
        // replace sector and wall with clip map
        mapinfo_set(&origmapinfo, &clipmapinfo);
        clipsectcnt = clipsectnum;  // should be a nop, "safety"...
    }
#endif

#ifdef YAX_ENABLE
restart_grand:
#endif
    do  //Collect sectors inside your square first
    {
        const walltype *wal;
        const sectortype *sec;
        int32_t startwall, endwall;

#ifdef HAVE_CLIPSHAPE_FEATURE
        if (clipsectcnt>=clipsectnum)
        {
            // one set of clip-sprite sectors completed, prepare the next

            curspr = &sprite[clipspritelist[clipspritecnt]];

            if (curidx < 0)  // per-sprite init
                curidx = pictoidx[curspr->picnum];
            else
                curidx = clipinfo[curidx].next;

            while (curidx>=0 && (curspr->cstat&32) != (sector[sectq[clipinfo[curidx].qbeg]].CM_CSTAT&32))
                curidx = clipinfo[curidx].next;

            if (curidx < 0)
            {
                // didn't find matching clipping sectors for sprite
                clipspritecnt++;
                continue;
            }

            clipsprite_initindex(curidx, curspr, &clipsectcnt, pos);

            for (i=0; i<clipsectnum; i++)
            {
                int32_t fz,cz, hitwhat;
                k = clipsectorlist[i];

                if (k==sectq[clipinfo[curidx].qend])
                    continue;

                getzsofslope((int16_t)k,pos->x,pos->y,&daz,&daz2);
                getzsofslope(sectq[clipinfo[curidx].qend],pos->x,pos->y,&cz,&fz);
                hitwhat = (curspr-sprite)+49152;

                if ((sector[k].ceilingstat&1)==0)
                {
                    if (pos->z < cz && cz < *florz) { *florz = cz; *florhit = hitwhat; }
                    if (pos->z > daz && daz > *ceilz) { *ceilz = daz; *ceilhit = hitwhat; }
                }
                if ((sector[k].floorstat&1)==0)
                {
                    if (pos->z < daz2 && daz2 < *florz) { *florz = daz2; *florhit = hitwhat; }
                    if (pos->z > fz && fz > *ceilz) { *ceilz = fz; *ceilhit = hitwhat; }
                }
            }
        }
#endif
        ////////// Walls //////////

        sec = &sector[clipsectorlist[clipsectcnt]];
        startwall = sec->wallptr; endwall = startwall + sec->wallnum;
        for (j=startwall,wal=&wall[startwall]; j<endwall; j++,wal++)
        {
            k = wal->nextsector;
            if (k >= 0)
            {
                const walltype *const wal2 = &wall[wal->point2];

                x1 = wal->x; x2 = wal2->x;
                if ((x1 < xmin) && (x2 < xmin)) continue;
                if ((x1 > xmax) && (x2 > xmax)) continue;
                y1 = wal->y; y2 = wal2->y;
                if ((y1 < ymin) && (y2 < ymin)) continue;
                if ((y1 > ymax) && (y2 > ymax)) continue;

                dx = x2-x1; dy = y2-y1;
                if (dx*(pos->y-y1) < (pos->x-x1)*dy) continue; //back
                if (dx > 0) dax = dx*(ymin-y1); else dax = dx*(ymax-y1);
                if (dy > 0) day = dy*(xmax-x1); else day = dy*(xmin-x1);
                if (dax >= day) continue;

                if (wal->cstat&dawalclipmask) continue;  // XXX?
                sec = &sector[k];

#ifdef HAVE_CLIPSHAPE_FEATURE
                if (curspr)
                {
                    if (k==sectq[clipinfo[curidx].qend])
                        continue;
                    if ((sec->ceilingstat&1) && (sec->floorstat&1))
                        continue;
                }
                else
#endif
                if (editstatus == 0)
                {
                    if (((sec->ceilingstat&1) == 0) && (pos->z <= sec->ceilingz+(3<<8))) continue;
                    if (((sec->floorstat&1) == 0) && (pos->z >= sec->floorz-(3<<8))) continue;
                }

                for (i=clipsectnum-1; i>=0; i--)
                    if (clipsectorlist[i] == k) break;
                if (i < 0) clipsectorlist[clipsectnum++] = k;

                if ((x1 < xmin+MAXCLIPDIST) && (x2 < xmin+MAXCLIPDIST)) continue;
                if ((x1 > xmax-MAXCLIPDIST) && (x2 > xmax-MAXCLIPDIST)) continue;
                if ((y1 < ymin+MAXCLIPDIST) && (y2 < ymin+MAXCLIPDIST)) continue;
                if ((y1 > ymax-MAXCLIPDIST) && (y2 > ymax-MAXCLIPDIST)) continue;
                if (dx > 0) dax += dx*MAXCLIPDIST; else dax -= dx*MAXCLIPDIST;
                if (dy > 0) day -= dy*MAXCLIPDIST; else day += dy*MAXCLIPDIST;
                if (dax >= day) continue;
#ifdef YAX_ENABLE
                if (mcf==-1 && curspr==NULL)
                    origclipsectorlist[origclipsectnum++] = k;
#endif
                //It actually got here, through all the continue's!!!
                getzsofslope(k, pos->x,pos->y, &daz,&daz2);

#ifdef HAVE_CLIPSHAPE_FEATURE
                if (curspr)
                {
                    int32_t fz,cz, hitwhat=(curspr-sprite)+49152;
                    getzsofslope(sectq[clipinfo[curidx].qend],pos->x,pos->y,&cz,&fz);

                    if ((sec->ceilingstat&1)==0)
                    {
                        if (pos->z < cz && cz < *florz) { *florz = cz; *florhit = hitwhat; }
                        if (pos->z > daz && daz > *ceilz) { *ceilz = daz; *ceilhit = hitwhat; }
                    }
                    if ((sec->floorstat&1)==0)
                    {
                        if (pos->z < daz2 && daz2 < *florz) { *florz = daz2; *florhit = hitwhat; }
                        if (pos->z > fz && fz > *ceilz) { *ceilz = fz; *ceilhit = hitwhat; }
                    }
                }
                else
#endif
                {
#ifdef YAX_ENABLE
                    int16_t cb, fb;
                    yax_getbunches(k, &cb, &fb);
#endif
                    if (daz > *ceilz)
#ifdef YAX_ENABLE
                        if (mcf!=YAX_FLOOR && cb < 0)
#endif
                        *ceilz = daz, *ceilhit = k+16384; 

                    if (daz2 < *florz)
#ifdef YAX_ENABLE
                        if (mcf!=YAX_CEILING && fb < 0)
#endif
                        *florz = daz2, *florhit = k+16384; 
                }
            }
        }
        clipsectcnt++;
    }
    while (clipsectcnt < clipsectnum || clipspritecnt < clipspritenum);

#ifdef HAVE_CLIPSHAPE_FEATURE
    if (curspr)
    {
        mapinfo_set(NULL, &origmapinfo);  // restore original map
        clipsectnum = clipspritenum = 0;  // skip the next for loop and check afterwards
    }
#endif

    ////////// Sprites //////////

    for (i=0; i<clipsectnum; i++)
    {
        if (dasprclipmask==0)
            break;

        for (j=headspritesect[clipsectorlist[i]]; j>=0; j=nextspritesect[j])
        {
            const spritetype *const spr = &sprite[j];
            const int32_t cstat = spr->cstat;

            if (cstat&dasprclipmask)
            {
                int32_t clipyou = 0;

#ifdef HAVE_CLIPSHAPE_FEATURE
                if (clipsprite_try(spr, xmin,ymin, xmax,ymax))
                    continue;
#endif
                x1 = spr->x; y1 = spr->y;

                switch (cstat&48)
                {
                case 0:
                    k = walldist+(spr->clipdist<<2)+1;
                    if ((klabs(x1-pos->x) <= k) && (klabs(y1-pos->y) <= k))
                    {
                        daz = spr->z + spriteheightofs(j, &k, 1);
                        daz2 = daz - k;
                        clipyou = 1;
                    }
                    break;

                case 16:
                {
                    get_wallspr_points(spr, &x1, &x2, &y1, &y2);

                    if (clipinsideboxline(pos->x,pos->y,x1,y1,x2,y2,walldist+1) != 0)
                    {
                        daz = spr->z + spriteheightofs(j, &k, 1);
                        daz2 = daz-k;
                        clipyou = 1;
                    }
                    break;
                }

                case 32:
                {
                    int32_t x3, y3, x4, y4;

                    daz = spr->z; daz2 = daz;

                    if ((cstat&64) != 0)
                        if ((pos->z > daz) == ((cstat&8)==0)) continue;

                    get_floorspr_points(spr, pos->x, pos->y, &x1, &x2, &x3, &x4,
                                       &y1, &y2, &y3, &y4);

                    dax = mulscale14(sintable[(spr->ang-256+512)&2047],walldist+4);
                    day = mulscale14(sintable[(spr->ang-256)&2047],walldist+4);
                    x1 += dax; x2 -= day; x3 -= dax; x4 += day;
                    y1 += day; y2 += dax; y3 -= day; y4 -= dax;

                    clipyou = get_floorspr_clipyou(x1, x2, x3, x4, y1, y2, y3, y4);
                    break;
                }
                }

                if (clipyou != 0)
                {
                    if ((pos->z > daz) && (daz > *ceilz
#ifdef YAX_ENABLE
                                           || (daz == *ceilz && yax_getbunch(clipsectorlist[i], YAX_CEILING)>=0)
#endif
                            ))
                    {
                        *ceilz = daz;
                        *ceilhit = j+49152;
                    }

                    if ((pos->z < daz2) && (daz2 < *florz
#ifdef YAX_ENABLE
                                            // can have a floor-sprite lying directly on the floor!
                                            || (daz2 == *florz && yax_getbunch(clipsectorlist[i], YAX_FLOOR)>=0)
#endif
                            ))
                    {
                        *florz = daz2;
                        *florhit = j+49152;
                    }
                }
            }
        }
    }

#ifdef HAVE_CLIPSHAPE_FEATURE
    if (clipspritenum>0)
        goto beginagain;
#endif

#ifdef YAX_ENABLE
    if (numyaxbunches > 0)
    {
        const int32_t dasecclipmask = yax_waltosecmask(dawalclipmask);
        int16_t cb, fb, didchange;

        yax_getbunches(sectnum, &cb, &fb);

        mcf++;
        clipsectcnt = 0; clipsectnum = 0;

        didchange = 0;
        if (cb>=0 && mcf==0 && *ceilhit==sectnum+16384)
        {
            for (i=0; i<origclipsectnum; i++)
            {
                j = origclipsectorlist[i];
                if (yax_getbunch(j, YAX_CEILING) >= 0)
                    if (sector[j].ceilingstat&dasecclipmask)
                        break;
            }

            if (i==origclipsectnum)
                for (i=0; i<origclipsectnum; i++)
                {
                    cb = yax_getbunch(origclipsectorlist[i], YAX_CEILING);
                    if (cb < 0)
                        continue;

                    for (SECTORS_OF_BUNCH(cb,YAX_FLOOR, j))
                        if (inside(pos->x,pos->y, j)==1)
                        {
                            clipsectorlist[clipsectnum++] = j;
                            daz = getceilzofslope(j, pos->x,pos->y);
                            if (!didchange || daz > *ceilz)
                                didchange=1, *ceilhit = j+16384, *ceilz = daz;
                        }
                }

            if (clipsectnum==0)
                mcf++;
        }
        else if (mcf==0)
            mcf++;

        didchange = 0;
        if (fb>=0 && mcf==1 && *florhit==sectnum+16384)
        {
            for (i=0; i<origclipsectnum; i++)
            {
                j = origclipsectorlist[i];
                if (yax_getbunch(j, YAX_FLOOR) >= 0)
                    if (sector[j].floorstat&dasecclipmask)
                        break;
            }

            // (almost) same as above, but with floors...
            if (i==origclipsectnum)
                for (i=0; i<origclipsectnum; i++)
                {
                    fb = yax_getbunch(origclipsectorlist[i], YAX_FLOOR);
                    if (fb < 0)
                        continue;

                    for (SECTORS_OF_BUNCH(fb, YAX_CEILING, j))
                        if (inside(pos->x,pos->y, j)==1)
                        {
                            clipsectorlist[clipsectnum++] = j;
                            daz = getflorzofslope(j, pos->x,pos->y);
                            if (!didchange || daz < *florz)
                                didchange=1, *florhit = j+16384, *florz = daz;
                        }
                }
        }

        if (clipsectnum > 0)
        {
            // sector-like sprite re-init:
            curidx = -1;
            curspr = NULL;
            clipspritecnt = 0; clipspritenum = 0;

            goto restart_grand;
        }
    }
#endif
}

int32_t setaspect_new_use_dimen = 0;

void setaspect_new()
{
    if (r_usenewaspect && newaspect_enable && getrendermode() != REND_POLYMER)
    {
        // The correction factor 100/107 has been found
        // out experimentally. Squares FTW!
        int32_t vr, yx=(65536*4*100)/(3*107);
        int32_t y, x;

        const int32_t xd = setaspect_new_use_dimen ? xdimen : xdim;
        const int32_t yd = setaspect_new_use_dimen ? ydimen : ydim;

        if (fullscreen && !setaspect_new_use_dimen)
        {
            const int32_t screenw = r_screenxy/100;
            const int32_t screenh = r_screenxy%100;

            if (screenw==0 || screenh==0)
            {
                // Assume square pixel aspect.
                x = xd;
                y = yd;
            }
            else
            {
                int32_t pixratio;

                x = screenw;
                y = screenh;

                pixratio = divscale16(xdim*screenh, ydim*screenw);
                yx = divscale16(yx, pixratio);
            }
        }
        else
        {
            x = xd;
            y = yd;
        }

        vr = divscale16(x*3, y*4);

        setaspect(vr, yx);
    }
    else
        setaspect(65536, divscale16(ydim*320, xdim*200));
}

//
// setview
//
void setview(int32_t x1, int32_t y1, int32_t x2, int32_t y2)
{
    int32_t i;

    windowx1 = x1; wx1 = (x1<<12);
    windowy1 = y1; wy1 = (y1<<12);
    windowx2 = x2; wx2 = ((x2+1)<<12);
    windowy2 = y2; wy2 = ((y2+1)<<12);

    xdimen = (x2-x1)+1; halfxdimen = (xdimen>>1);
    xdimenrecip = divscale32(1L,xdimen);
    ydimen = (y2-y1)+1;

    setaspect_new();

    for (i=0; i<windowx1; i++) { startumost[i] = 1, startdmost[i] = 0; }
    for (i=windowx1; i<=windowx2; i++)
        { startumost[i] = windowy1, startdmost[i] = windowy2+1; }
    for (i=windowx2+1; i<xdim; i++) { startumost[i] = 1, startdmost[i] = 0; }
}


//
// setaspect
//
void setaspect(int32_t daxrange, int32_t daaspect)
{
    viewingrange = daxrange;
    viewingrangerecip = divscale32(1,daxrange);

    yxaspect = daaspect;
    xyaspect = divscale32(1,yxaspect);
    xdimenscale = scale(xdimen,yxaspect,320);
    xdimscale = scale(320,xyaspect,xdimen);
}


//
// flushperms
//
void flushperms(void)
{
    permhead = permtail = 0;
}


//
// rotatesprite
//
void rotatesprite_(int32_t sx, int32_t sy, int32_t z, int16_t a, int16_t picnum,
                  int8_t dashade, char dapalnum, int32_t dastat, uint8_t daalpha,
                  int32_t cx1, int32_t cy1, int32_t cx2, int32_t cy2)
{
    int32_t i;
    permfifotype *per, *per2;

    if ((unsigned)picnum >= MAXTILES)
        return;

    if ((cx1 > cx2) || (cy1 > cy2)) return;
    if (z <= 16) return;
    DO_TILE_ANIM(picnum, 0xc000);
    if ((tilesizx[picnum] <= 0) || (tilesizy[picnum] <= 0)) return;

    // Experimental / development bits. ONLY FOR INTERNAL USE!
    //  bit RS_CENTERORIGIN: see dorotspr_handle_bit2
    ////////////////////

    if (((dastat&128) == 0) || (numpages < 2) || (beforedrawrooms != 0))
    {
        begindrawing(); //{{{
        dorotatesprite(sx,sy,z,a,picnum,dashade,dapalnum,dastat,daalpha,cx1,cy1,cx2,cy2,guniqhudid);
        enddrawing();   //}}}
    }

    if ((dastat&64) && (cx1 <= 0) && (cy1 <= 0) && (cx2 >= xdim-1) && (cy2 >= ydim-1) &&
            (sx == (160<<16)) && (sy == (100<<16)) && (z == 65536L) && (a == 0) && ((dastat&1) == 0))
        permhead = permtail = 0;

    if ((dastat&128) == 0) return;
    if (numpages >= 2)
    {
        per = &permfifo[permhead];
        per->sx = sx; per->sy = sy; per->z = z; per->a = a;
        per->picnum = picnum;
        per->dashade = dashade; per->dapalnum = dapalnum;
        per->dastat = dastat;
        per->daalpha = daalpha;
        per->pagesleft = numpages+((beforedrawrooms&1)<<7);
        per->cx1 = cx1; per->cy1 = cy1; per->cx2 = cx2; per->cy2 = cy2;
        per->uniqid = guniqhudid;   //JF extension

        //Would be better to optimize out true bounding boxes
        if (dastat&64)  //If non-masking write, checking for overlapping cases
        {
            for (i=permtail; i!=permhead; i=((i+1)&(MAXPERMS-1)))
            {
                per2 = &permfifo[i];
                if ((per2->pagesleft&127) == 0) continue;
                if (per2->sx != per->sx) continue;
                if (per2->sy != per->sy) continue;
                if (per2->z != per->z) continue;
                if (per2->a != per->a) continue;
                if (tilesizx[per2->picnum] > tilesizx[per->picnum]) continue;
                if (tilesizy[per2->picnum] > tilesizy[per->picnum]) continue;
                if (per2->cx1 < per->cx1) continue;
                if (per2->cy1 < per->cy1) continue;
                if (per2->cx2 > per->cx2) continue;
                if (per2->cy2 > per->cy2) continue;
                per2->pagesleft = 0;
            }
            if ((per->z == 65536) && (per->a == 0))
                for (i=permtail; i!=permhead; i=((i+1)&(MAXPERMS-1)))
                {
                    per2 = &permfifo[i];
                    if ((per2->pagesleft&127) == 0) continue;
                    if (per2->z != 65536) continue;
                    if (per2->a != 0) continue;
                    if (per2->cx1 < per->cx1) continue;
                    if (per2->cy1 < per->cy1) continue;
                    if (per2->cx2 > per->cx2) continue;
                    if (per2->cy2 > per->cy2) continue;
                    if ((per2->sx>>16) < (per->sx>>16)) continue;
                    if ((per2->sy>>16) < (per->sy>>16)) continue;
                    if ((per2->sx>>16)+tilesizx[per2->picnum] > (per->sx>>16)+tilesizx[per->picnum]) continue;
                    if ((per2->sy>>16)+tilesizy[per2->picnum] > (per->sy>>16)+tilesizy[per->picnum]) continue;
                    per2->pagesleft = 0;
                }
        }

        permhead = ((permhead+1)&(MAXPERMS-1));
    }
}


//
// makepalookup
//
void makepalookup(int32_t palnum, const char *remapbuf, int8_t r, int8_t g, int8_t b, char dastat)
{
    int32_t i, j, palscale;
    const char *ptr;
    char *ptr2;

    static char idmap[256] = {1};

    if (paletteloaded == 0)
        return;

    // NOTE: palnum==0 is allowed
    if ((unsigned)palnum >= MAXPALOOKUPS)
        return;

    if (remapbuf==NULL)
    {
        if ((r|g|b) == 0)
        {
            palookup[palnum] = palookup[0];  // Alias to base shade table!
            return;
        }

        if (idmap[0]==1)  // init identity map
            for (i=0; i<256; i++)
                idmap[i] = i;

        remapbuf = idmap;
    }

    if (palookup[palnum] == NULL || (palnum!=0 && palookup[palnum] == palookup[0]))
    {
        alloc_palookup(palnum);
        if (palookup[palnum] == NULL)
            exit(1);
    }

    if (dastat == 0) return;
    if ((r|g|b|63) != 63) return;

    if ((r|g|b) == 0)
    {
        // "black fog"/visibility case -- only remap color indices

        for (i=0; i<256; i++)
        {
            ptr = palookup[0] + remapbuf[i];
            ptr2 = palookup[palnum] + i;

            for (j=0; j<numshades; j++)
                { *ptr2 = *ptr; ptr += 256; ptr2 += 256; }
        }
    }
    else
    {
        // colored fog case

        ptr2 = palookup[palnum];

        for (i=0; i<numshades; i++)
        {
            palscale = divscale16(i,numshades);
            for (j=0; j<256; j++)
            {
                ptr = (char *)&palette[remapbuf[j]*3];
                *ptr2++ = getclosestcol(ptr[0] + mulscale16(r-ptr[0],palscale),
                                        ptr[1] + mulscale16(g-ptr[1],palscale),
                                        ptr[2] + mulscale16(b-ptr[2],palscale));
            }
        }
    }

#if defined(USE_OPENGL)
    palookupfog[palnum].r = r;
    palookupfog[palnum].g = g;
    palookupfog[palnum].b = b;
#endif
}

//
// setbasepaltable
//
void setbasepaltable(uint8_t **thebasepaltable, uint8_t thebasepalcount)
{
    if (thebasepalcount >= MAXBASEPALS)
        thebasepalcount = MAXBASEPALS - 1;

    basepaltableptr = thebasepaltable;
    basepalcount = thebasepalcount;
}

//
// setbrightness
//
// flags:
//  1: don't setpalette(),  DON'T USE THIS FLAG!
//  2: don't gltexinvalidateall()
//  4: don't calc curbrightness from dabrightness,  DON'T USE THIS FLAG!
//  8: don't gltexinvalidate8()
// 16: don't reset palfade*
void setbrightness(char dabrightness, uint8_t dapalid, uint8_t flags)
{
    int32_t i, j, nohwgamma;
    const uint8_t *dapal;

#ifdef USE_OPENGL
    int32_t paldidchange;
#endif
    int32_t palsumdidchange;
//    uint32_t lastbright = curbrightness;

    Bassert((flags&4)==0);

    if (dapalid >= basepalcount)
        dapalid = 0;
#ifdef USE_OPENGL
    paldidchange = (curbasepal != dapalid || basepalreset);
#endif
    curbasepal = dapalid;
    basepalreset = 0;

    dapal = basepaltableptr[curbasepal];

    if (!(flags&4))
    {
        curbrightness = clamp(dabrightness, 0, 15);
//        if (lastbright != (unsigned)curbrightness)
//            vid_gamma = 1.0 + ((float)curbrightness / 10.0);
    }

    nohwgamma = setgamma();
    j = nohwgamma ? curbrightness : 0;

    for (i=0; i<256; i++)
    {
        // save palette without any brightness adjustment
        curpalette[i].r = dapal[i*3+0] << 2;
        curpalette[i].g = dapal[i*3+1] << 2;
        curpalette[i].b = dapal[i*3+2] << 2;
        curpalette[i].f = 0;

        // brightness adjust the palette
        curpalettefaded[i].b = britable[j][ curpalette[i].b ];
        curpalettefaded[i].g = britable[j][ curpalette[i].g ];
        curpalettefaded[i].r = britable[j][ curpalette[i].r ];
        curpalettefaded[i].f = 0;
    }

    if ((flags&16) && palfadedelta)  // keep the fade
        setpalettefade_calc(palfadedelta>>2);

    {
        static uint32_t lastpalettesum=0;
        uint32_t newpalettesum = crc32once((uint8_t *)curpalettefaded, sizeof(curpalettefaded));

        palsumdidchange = (newpalettesum != lastpalettesum);

        if (palsumdidchange || newpalettesum != g_lastpalettesum)
        {
//            if ((flags&1) == 0)
                setpalette(0,256);
        }

        g_lastpalettesum = lastpalettesum = newpalettesum;
    }

#ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST)
    {
        // Only reset the textures if the corresponding preserve flags are clear and
        // either (a) the new palette is different to the last, or (b) the brightness
        // changed and we couldn't set it using hardware gamma.

        // XXX: no-HW-gamma OpenGL platforms will exhibit bad performance with
        // simultaneous basepal and tint changes?
        const int32_t doinvalidate = (paldidchange || (palsumdidchange && nohwgamma));

        if (!(flags&2) && doinvalidate)
            gltexinvalidatetype(INVALIDATE_ALL);
        if (!(flags&8) && doinvalidate)
            gltexinvalidatetype(INVALIDATE_ART);
#ifdef POLYMER
        if ((getrendermode() == REND_POLYMER) && doinvalidate)
            polymer_texinvalidate();
#endif
    }
#endif

    if ((flags&16)==0)
    {
        palfadergb.r = palfadergb.g = palfadergb.b = 0;
        palfadedelta = 0;
    }
}

static inline palette_t getpal(int32_t col)
{
    if (gammabrightness) return curpalette[col];
    else
    {
        palette_t p;
        p.b = britable[curbrightness][ curpalette[col].b ];
        p.g	= britable[curbrightness][ curpalette[col].g ];
        p.r = britable[curbrightness][ curpalette[col].r ];
//#ifdef __APPLE__
        p.f = 0;  // make gcc on osx happy
//#endif
        return p;
    }
}

static void setpalettefade_calc(uint8_t offset)
{
    int32_t i;
    palette_t p;

    for (i=0; i<256; i++)
    {
        p = getpal(i);

        curpalettefaded[i].b =
            p.b + (((palfadergb.b - p.b) * offset) >> 6);
        curpalettefaded[i].g =
            p.g + (((palfadergb.g - p.g) * offset) >> 6);
        curpalettefaded[i].r =
            p.r + (((palfadergb.r - p.r) * offset) >> 6);
        curpalettefaded[i].f = 0;
    }
}

//#define DEBUG_PALETTEFADE

//
// setpalettefade
//
void setpalettefade(char r, char g, char b, char offset)
{
    palfadergb.r = min(63,r) << 2;
    palfadergb.g = min(63,g) << 2;
    palfadergb.b = min(63,b) << 2;
#ifdef DEBUG_PALETTEFADE
    if (offset)
        offset = max(offset, 32);
#endif
    palfadedelta = min(63,offset) << 2;

    setpalettefade_calc(offset);

    {
        static uint32_t lastpalettesum=0;
        uint32_t newpalettesum = crc32once((uint8_t *)curpalettefaded, sizeof(curpalettefaded));

        if (newpalettesum != lastpalettesum || newpalettesum != g_lastpalettesum)
        {
            setpalette(0,256);
        }

        g_lastpalettesum = lastpalettesum = newpalettesum;
    }
}


//
// clearview
//
void clearview(int32_t dacol)
{
    intptr_t p;
    int32_t  y, dx;

    if (!in3dmode()) return;

#ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST)
    {
        palette_t p = getpal(dacol);

        bglClearColor(((float)p.r)/255.0,
                      ((float)p.g)/255.0,
                      ((float)p.b)/255.0,
                      0);
        bglClear(GL_COLOR_BUFFER_BIT);
        return;
    }
#endif

    begindrawing(); //{{{
    dx = windowx2-windowx1+1;
    //dacol += (dacol<<8); dacol += (dacol<<16);
    p = frameplace+ylookup[windowy1]+windowx1;
    for (y=windowy1; y<=windowy2; y++)
    {
        //clearbufbyte((void*)p,dx,dacol);
        Bmemset((void *)p,dacol,dx);
        p += ylookup[1];
    }
    enddrawing();   //}}}

    faketimerhandler();
}


//
// clearallviews
//
void clearallviews(int32_t dacol)
{
    if (!in3dmode()) return;
    //dacol += (dacol<<8); dacol += (dacol<<16);

#ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST)
    {
        palette_t p = getpal(dacol);

        bglViewport(0,0,xdim,ydim); glox1 = -1;
        bglClearColor(((float)p.r)/255.0,
                      ((float)p.g)/255.0,
                      ((float)p.b)/255.0,
                      0);
        bglClear(GL_COLOR_BUFFER_BIT);
        return;
    }
#endif

    begindrawing(); //{{{
    Bmemset((void *)frameplace,dacol,bytesperline*yres);
    enddrawing();   //}}}
    //nextpage();

    faketimerhandler();
}


//
// plotpixel
//
void plotpixel(int32_t x, int32_t y, char col)
{
#ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST && in3dmode())
    {
        palette_t p = getpal(col);

        bglRasterPos4i(x, y, 0, 1);
        bglDrawPixels(1, 1, GL_RGB, GL_UNSIGNED_BYTE, &p);
        bglRasterPos4i(0, 0, 0, 1);
        return;
    }
#endif

    begindrawing(); //{{{
    drawpixel_safe((void *)(ylookup[y]+x+frameplace), col);
    enddrawing();   //}}}
}

void plotlines2d(const int32_t *xx, const int32_t *yy, int32_t numpoints, char col)
{
    int32_t i;

#ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST && in3dmode())
    {
        palette_t p = getpal(col);

        bglBegin(GL_LINE_STRIP);

        bglColor4ub(p.r, p.g, p.b, 1);

        for (i=0; i<numpoints; i++)
            bglVertex2i(xx[i], yy[i]);

        bglEnd();
        return;
    }
#endif
    {
        int32_t odrawlinepat = drawlinepat;
        drawlinepat = 0xffffffff;

        begindrawing();
        for (i=0; i<numpoints-1; i++)
            drawline16(xx[i], yy[i], xx[i+1], yy[i+1], col);
        enddrawing();

        drawlinepat = odrawlinepat;
    }
}


//
// getpixel
//
char getpixel(int32_t x, int32_t y)
{
    char r;

#ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST && in3dmode()) return 0;
#endif

    begindrawing(); //{{{
    r = readpixel((void *)(ylookup[y]+x+frameplace));
    enddrawing();   //}}}
    return(r);
}


//MUST USE RESTOREFORDRAWROOMS AFTER DRAWING

//
// setviewtotile
//
void setviewtotile(int16_t tilenume, int32_t xsiz, int32_t ysiz)
{
    //DRAWROOMS TO TILE BACKUP&SET CODE
    tilesizx[tilenume] = xsiz; tilesizy[tilenume] = ysiz;
    bakxsiz[setviewcnt] = xsiz; bakysiz[setviewcnt] = ysiz;
    bakframeplace[setviewcnt] = frameplace; frameplace = waloff[tilenume];
    bakwindowx1[setviewcnt] = windowx1; bakwindowy1[setviewcnt] = windowy1;
    bakwindowx2[setviewcnt] = windowx2; bakwindowy2[setviewcnt] = windowy2;
#ifdef USE_OPENGL
    if (setviewcnt == 0)
    {
        bakrendmode = rendmode;
        baktile = tilenume;
    }
    rendmode = REND_CLASSIC;//2;
#endif
    copybufbyte(&startumost[windowx1],&bakumost[windowx1],(windowx2-windowx1+1)*sizeof(bakumost[0]));
    copybufbyte(&startdmost[windowx1],&bakdmost[windowx1],(windowx2-windowx1+1)*sizeof(bakdmost[0]));
    setviewcnt++;

    offscreenrendering = 1;
    setview(0,0,ysiz-1,xsiz-1);
    setaspect(65536,65536);

    calc_ylookup(ysiz, xsiz);
}


//
// setviewback
//
extern char modechange;
void setviewback(void)
{
    int32_t k;

    if (setviewcnt <= 0) return;
    setviewcnt--;

    offscreenrendering = (setviewcnt>0);
#ifdef USE_OPENGL
    if (setviewcnt == 0)
    {
        rendmode = bakrendmode;
        invalidatetile(baktile,-1,-1);
    }
#endif

    setview(bakwindowx1[setviewcnt],bakwindowy1[setviewcnt],
            bakwindowx2[setviewcnt],bakwindowy2[setviewcnt]);
    copybufbyte(&bakumost[windowx1],&startumost[windowx1],(windowx2-windowx1+1)*sizeof(startumost[0]));
    copybufbyte(&bakdmost[windowx1],&startdmost[windowx1],(windowx2-windowx1+1)*sizeof(startdmost[0]));
    frameplace = bakframeplace[setviewcnt];

    if (setviewcnt == 0)
        k = bakxsiz[0];
    else
        k = max(bakxsiz[setviewcnt-1],bakxsiz[setviewcnt]);
    calc_ylookup(bytesperline, k);

    modechange=1;
}


//
// squarerotatetile
//
void squarerotatetile(int16_t tilenume)
{
    int32_t siz;

    //supports square tiles only for rotation part
    if ((siz = tilesizx[tilenume]) == tilesizy[tilenume])
    {
        int32_t i = siz-1;

        for (; i>=0; i--)
        {
            int32_t j=(i>>1)-1;
            char *ptr1 = (char *)(waloff[tilenume]+i*(siz+1)), *ptr2 = ptr1;
            if (i&1) swapchar(--ptr1, (ptr2 -= siz));
            for (; j>=0; j--) swapchar2((ptr1 -= 2), (ptr2 -= (siz<<1)), siz);
        }
    }
}

//
// preparemirror
//
void preparemirror(int32_t dax, int32_t day, int16_t daang, int16_t dawall,
                   int32_t *tposx, int32_t *tposy, int16_t *tang)
{
    int32_t i;

    const int32_t x = wall[dawall].x, dx = wall[wall[dawall].point2].x-x;
    const int32_t y = wall[dawall].y, dy = wall[wall[dawall].point2].y-y;

    const int32_t j = dx*dx + dy*dy;
    if (j == 0)
        return;

    i = ((dax-x)*dx + (day-y)*dy)<<1;

    *tposx = (x<<1) + scale(dx,i,j) - dax;
    *tposy = (y<<1) + scale(dy,i,j) - day;
    *tang = ((getangle(dx,dy)<<1)-daang)&2047;

    inpreparemirror = 1;
}


//
// completemirror
//
void completemirror(void)
{
#ifdef USE_OPENGL
    if (getrendermode() != REND_CLASSIC)
        return;
#endif

    // Can't reverse when the world has not yet been drawn from the other side.
    if (inpreparemirror) { inpreparemirror = 0; return; }

    // The mirroring code maps the rightmost pixel to the right neighbor of the
    // leftmost one (see copybufreverse() call below). Thus, the leftmost would
    // be mapped to the right neighbor of the rightmost one, which would be out
    // of bounds.
    if (mirrorsx1 == 0)
        mirrorsx1 = 1;

    // Require that the mirror is at least one pixel wide before padding.
    if (mirrorsx1 > mirrorsx2)
        return;

    // Variables mirrorsx{1,2} refer to the source scene here, the one drawn
    // from the inside of the mirror.

    begindrawing();
    {
        // Width in pixels (screen x's are inclusive on both sides):
        const int32_t width = mirrorsx2-mirrorsx1+1;
        // Height in pixels (screen y's are half-open because they come from umost/dmost):
        const int32_t height = mirrorsy2-mirrorsy1;

        // Address of the mirror wall's top left corner in the source scene:
        intptr_t p = frameplace + ylookup[windowy1+mirrorsy1] + windowx1+mirrorsx1;

        // Offset (wrt p) of a mirror line's left corner in the destination:
        // p+destof == frameplace + ylookup[...] + windowx2-mirrorsx2
        const int32_t destofs = windowx2-mirrorsx2-windowx1-mirrorsx1;

        int32_t y;

        for (y=0; y<height; y++)
        {
#if 0
            if ((p-frameplace) + width-1 >= bytesperline*ydim)
                printf("oob read: mirrorsx1=%d, mirrorsx2=%d\n", mirrorsx1, mirrorsx2);
#endif
            copybufbyte((void *)p, tempbuf, width);
            copybufreverse(&tempbuf[width-1], (void *)(p+destofs+1), width);

            p += ylookup[1];
            faketimerhandler();
        }
    }
    enddrawing();
}


//
// sectorofwall
//
static int32_t sectorofwall_internal(int16_t theline)
{
    int32_t gap = numsectors>>1, i = gap;

    while (gap > 1)
    {
        gap >>= 1;
        if (sector[i].wallptr < theline) i += gap; else i -= gap;
    }
    while (sector[i].wallptr > theline) i--;
    while (sector[i].wallptr+sector[i].wallnum <= theline) i++;

    return i;
}

int32_t sectorofwall(int16_t theline)
{
    int32_t i;

    if (theline < 0 || theline >= numwalls)
        return -1;

    i = wall[theline].nextwall;
    if (i >= 0 && i < MAXWALLS)
        return wall[i].nextsector;

    return sectorofwall_internal(theline);
}

int32_t sectorofwall_noquick(int16_t theline)
{
    if (theline < 0 || theline >= numwalls)
        return -1;

    return sectorofwall_internal(theline);
}


int32_t getceilzofslopeptr(const sectortype *sec, int32_t dax, int32_t day)
{
    if (!(sec->ceilingstat&2))
        return sec->ceilingz;

    {
        const walltype *wal = &wall[sec->wallptr];

        // floor(sqrt(2**31-1)) == 46340
        int32_t i, j, wx=wal->x, wy=wal->y;
        int32_t dx = wall[wal->point2].x-wx, dy = wall[wal->point2].y-wy;

        i = nsqrtasm(uhypsq(dx,dy))<<5;
        if (i == 0)
            return sec->ceilingz;

        j = dmulscale3(dx, day-wy, -dy, dax-wx);
        return sec->ceilingz + (scale(sec->ceilingheinum,j>>1,i)<<1);
    }
}

int32_t getflorzofslopeptr(const sectortype *sec, int32_t dax, int32_t day)
{
    if (!(sec->floorstat&2))
        return sec->floorz;

    {
        const walltype *wal = &wall[sec->wallptr];

        int32_t i, j, wx=wal->x, wy=wal->y;
        int32_t dx = wall[wal->point2].x-wx, dy = wall[wal->point2].y-wy;

        i = nsqrtasm(uhypsq(dx,dy))<<5;
        if (i == 0)
            return sec->floorz;

        j = dmulscale3(dx, day-wy, -dy, dax-wx);
        return sec->floorz + (scale(sec->floorheinum,j>>1,i)<<1);
    }
}

void getzsofslopeptr(const sectortype *sec, int32_t dax, int32_t day, int32_t *ceilz, int32_t *florz)
{
    *ceilz = sec->ceilingz; *florz = sec->floorz;

    if ((sec->ceilingstat|sec->floorstat)&2)
    {
        int32_t i, j;
        const walltype *wal = &wall[sec->wallptr], *wal2 = &wall[wal->point2];
        const int32_t dx = wal2->x-wal->x, dy = wal2->y-wal->y;

        i = nsqrtasm(uhypsq(dx,dy))<<5;
        if (i == 0)
            return;

        j = dmulscale3(dx,day-wal->y, -dy,dax-wal->x);
        if (sec->ceilingstat&2)
            *ceilz += scale(sec->ceilingheinum,j>>1,i)<<1;
        if (sec->floorstat&2)
            *florz += scale(sec->floorheinum,j>>1,i)<<1;
    }
}


//
// alignceilslope
//
void alignceilslope(int16_t dasect, int32_t x, int32_t y, int32_t z)
{
    const walltype *const wal = &wall[sector[dasect].wallptr];
    const int32_t dax = wall[wal->point2].x-wal->x;
    const int32_t day = wall[wal->point2].y-wal->y;

    const int32_t i = (y-wal->y)*dax - (x-wal->x)*day;
    if (i == 0)
        return;

    sector[dasect].ceilingheinum = scale((z-sector[dasect].ceilingz)<<8,
                                         nsqrtasm(uhypsq(dax,day)), i);
    if (sector[dasect].ceilingheinum == 0)
        sector[dasect].ceilingstat &= ~2;
    else sector[dasect].ceilingstat |= 2;
}


//
// alignflorslope
//
void alignflorslope(int16_t dasect, int32_t x, int32_t y, int32_t z)
{
    const walltype *const wal = &wall[sector[dasect].wallptr];
    const int32_t dax = wall[wal->point2].x-wal->x;
    const int32_t day = wall[wal->point2].y-wal->y;

    const int32_t i = (y-wal->y)*dax - (x-wal->x)*day;
    if (i == 0)
        return;

    sector[dasect].floorheinum = scale((z-sector[dasect].floorz)<<8,
                                       nsqrtasm(uhypsq(dax,day)), i);
    if (sector[dasect].floorheinum == 0)
        sector[dasect].floorstat &= ~2;
    else sector[dasect].floorstat |= 2;
}


//
// loopnumofsector
//
int32_t loopnumofsector(int16_t sectnum, int16_t wallnum)
{
    int32_t i;

    int32_t numloops = 0;
    const int32_t startwall = sector[sectnum].wallptr;
    const int32_t endwall = startwall + sector[sectnum].wallnum;

    for (i=startwall; i<endwall; i++)
    {
        if (i == wallnum)
            return numloops;

        if (wall[i].point2 < i)
            numloops++;
    }

    return -1;
}


//
// setfirstwall
//
void setfirstwall(int16_t sectnum, int16_t newfirstwall)
{
    int32_t i, j, numwallsofloop;
    int32_t dagoalloop;
    walltype *tmpwall;

    const int32_t startwall = sector[sectnum].wallptr;
    const int32_t danumwalls = sector[sectnum].wallnum;
    const int32_t endwall = startwall+danumwalls;

    if (newfirstwall < startwall || newfirstwall >= startwall+danumwalls)
        return;

    tmpwall = (walltype *)Bmalloc(danumwalls * sizeof(walltype));
    if (!tmpwall)
    {
        initprintf("setfirstwall: OUT OF MEMORY!\n");
        return;
    }

    Bmemcpy(tmpwall, &wall[startwall], danumwalls*sizeof(walltype));

    numwallsofloop = 0;
    i = newfirstwall;
    do
    {
        numwallsofloop++;
        i = wall[i].point2;
    }
    while (i != newfirstwall);

    //Put correct loop at beginning
    dagoalloop = loopnumofsector(sectnum,newfirstwall);
    if (dagoalloop > 0)
    {
        j = 0;
        while (loopnumofsector(sectnum,j+startwall) != dagoalloop)
            j++;

        for (i=0; i<danumwalls; i++)
        {
            int32_t k = i+j;
            if (k >= danumwalls) k -= danumwalls;
            Bmemcpy(&wall[startwall+i], &tmpwall[k], sizeof(walltype));

            wall[startwall+i].point2 += danumwalls-startwall-j;
            if (wall[startwall+i].point2 >= danumwalls)
                wall[startwall+i].point2 -= danumwalls;
            wall[startwall+i].point2 += startwall;
        }

        newfirstwall += danumwalls-j;
        if (newfirstwall >= startwall+danumwalls)
            newfirstwall -= danumwalls;
    }

    for (i=0; i<numwallsofloop; i++)
        Bmemcpy(&tmpwall[i], &wall[i+startwall], sizeof(walltype));
    for (i=0; i<numwallsofloop; i++)
    {
        int32_t k = i+newfirstwall-startwall;
        if (k >= numwallsofloop) k -= numwallsofloop;
        Bmemcpy(&wall[startwall+i], &tmpwall[k], sizeof(walltype));

        wall[startwall+i].point2 += numwallsofloop-newfirstwall;
        if (wall[startwall+i].point2 >= numwallsofloop)
            wall[startwall+i].point2 -= numwallsofloop;
        wall[startwall+i].point2 += startwall;
    }

    for (i=startwall; i<endwall; i++)
        if (wall[i].nextwall >= 0)
            wall[wall[i].nextwall].nextwall = i;

#ifdef YAX_ENABLE
    {
        int16_t cb, fb;
        yax_getbunches(sectnum, &cb, &fb);

        if (cb>=0 || fb>=0)
        {
            for (i=startwall; i<endwall; i++)
            {
                j = yax_getnextwall(i, YAX_CEILING);
                if (j >= 0)
                    yax_setnextwall(j, YAX_FLOOR, i);

                j = yax_getnextwall(i, YAX_FLOOR);
                if (j >= 0)
                    yax_setnextwall(j, YAX_CEILING, i);
            }
        }
    }
#endif

    Bfree(tmpwall);
}


//
// drawline256
//
void drawline256(int32_t x1, int32_t y1, int32_t x2, int32_t y2, char col)
{
    int32_t dx, dy, i, j, inc, plc, daend;
    intptr_t p;

    col = palookup[0][col];

#ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST)
    {
        palette_t p = getpal(col);

        setpolymost2dview();	// JBF 20040205: more efficient setup

        //bglEnable(GL_BLEND);	// When using line antialiasing, this is needed
        bglBegin(GL_LINES);
        bglColor4ub(p.r,p.g,p.b,255);
        bglVertex2f((float)x1/4096.0,(float)y1/4096.0);
        bglVertex2f((float)x2/4096.0,(float)y2/4096.0);
        bglEnd();
        //bglDisable(GL_BLEND);

        return;
    }
#endif

    dx = x2-x1; dy = y2-y1;
    if (dx >= 0)
    {
        if ((x1 >= wx2) || (x2 < wx1)) return;
        if (x1 < wx1) y1 += scale(wx1-x1,dy,dx), x1 = wx1;
        if (x2 > wx2) y2 += scale(wx2-x2,dy,dx), x2 = wx2;
    }
    else
    {
        if ((x2 >= wx2) || (x1 < wx1)) return;
        if (x2 < wx1) y2 += scale(wx1-x2,dy,dx), x2 = wx1;
        if (x1 > wx2) y1 += scale(wx2-x1,dy,dx), x1 = wx2;
    }
    if (dy >= 0)
    {
        if ((y1 >= wy2) || (y2 < wy1)) return;
        if (y1 < wy1) x1 += scale(wy1-y1,dx,dy), y1 = wy1;
        if (y2 > wy2) x2 += scale(wy2-y2,dx,dy), y2 = wy2;
    }
    else
    {
        if ((y2 >= wy2) || (y1 < wy1)) return;
        if (y2 < wy1) x2 += scale(wy1-y2,dx,dy), y2 = wy1;
        if (y1 > wy2) x1 += scale(wy2-y1,dx,dy), y1 = wy2;
    }

    if (klabs(dx) >= klabs(dy))
    {
        if (dx == 0) return;
        if (dx < 0)
        {
            i = x1; x1 = x2; x2 = i;
            i = y1; y1 = y2; y2 = i;
        }

        inc = divscale12(dy,dx);
        plc = y1+mulscale12((2047-x1)&4095,inc);
        i = ((x1+2048)>>12); daend = ((x2+2048)>>12);

        begindrawing(); //{{{
        for (; i<daend; i++)
        {
            j = (plc>>12);
            if ((j >= startumost[i]) && (j < startdmost[i]))
                drawpixel_safe((void *)(frameplace+ylookup[j]+i),col);
            plc += inc;
        }
        enddrawing();   //}}}
    }
    else
    {
        if (dy < 0)
        {
            i = x1; x1 = x2; x2 = i;
            i = y1; y1 = y2; y2 = i;
        }

        inc = divscale12(dx,dy);
        plc = x1+mulscale12((2047-y1)&4095,inc);
        i = ((y1+2048)>>12); daend = ((y2+2048)>>12);

        begindrawing(); //{{{
        p = ylookup[i]+frameplace;
        for (; i<daend; i++)
        {
            j = (plc>>12);
            if ((i >= startumost[j]) && (i < startdmost[j]))
                drawpixel_safe((void *)(j+p),col);
            plc += inc; p += ylookup[1];
        }
        enddrawing();   //}}}
    }
}

//static void attach_here() {}

//
// drawline16
//
// JBF: Had to add extra tests to make sure x-coordinates weren't winding up -'ve
//   after clipping or crashes would ensue
uint32_t drawlinepat = 0xffffffff;

int32_t drawline16(int32_t x1, int32_t y1, int32_t x2, int32_t y2, char col)
{
    int32_t i, dx, dy, pinc, d;
    uint32_t patc=0;
    intptr_t p;

//int32_t odx,ody;
//int32_t ox1=x1,oy1=y1, ox2=x2,oy2=y2;

    dx = x2-x1;
    dy = y2-y1;

//odx=dx;
//ody=dy;

    if (dx >= 0)
    {
        if (x1 >= xres || x2 < 0)
            return 0;
        if (x1 < 0)
        {
            if (dy) y1 += scale(0-x1,dy,dx);
            x1 = 0;
        }
        if (x2 >= xres)
        {
            if (dy) y2 += scale(xres-1-x2,dy,dx);
            x2 = xres-1;
        }
    }
    else
    {
        if (x2 >= xres || x1 < 0)
            return 0;
        if (x2 < 0)
        {
            if (dy) y2 += scale(0-x2,dy,dx);
            x2 = 0;
        }
        if (x1 >= xres)
        {
            if (dy) y1 += scale(xres-1-x1,dy,dx);
            x1 = xres-1;
        }
    }

    if (dy >= 0)
    {
        if (y1 >= ydim16 || y2 < 0)
            return 0;
        if (y1 < 0)
        {
            if (dx) x1 += scale(0-y1,dx,dy);
            y1 = 0;
            x1 = clamp(x1, 0, xres-1);
        }
        if (y2 >= ydim16)
        {
            if (dx) x2 += scale(ydim16-1-y2,dx,dy);
            y2 = ydim16-1;
            x2 = clamp(x2, 0, xres-1);
        }
    }
    else
    {
        if (y2 >= ydim16 || y1 < 0)
            return 0;
        if (y2 < 0)
        {
            if (dx) x2 += scale(0-y2,dx,dy);
            y2 = 0;
            x2 = clamp(x2, 0, xres-1);
        }
        if (y1 >= ydim16)
        {
            if (dx) x1 += scale(ydim16-1-y1,dx,dy);
            y1 = ydim16-1;
            x1 = clamp(x1, 0, xres-1);
        }
    }

//if (ox1||ox2||oy1||oy2)
//    if (x1<0||x1>=xres || y2<0||y2>=yres)
//        attach_here();

    dx = klabs(x2-x1)+1; dy = klabs(y2-y1)+1;
    if (dx >= dy)
    {
        if (x2 < x1)
        {
            i = x1; x1 = x2; x2 = i;
            i = y1; y1 = y2; y2 = i;
        }
        d = 0;
        if (y2 > y1) pinc = bytesperline; else pinc = -bytesperline;

        begindrawing(); //{{{
        p = (y1*bytesperline)+x1+frameplace;
        if (dy == 0 && drawlinepat == 0xffffffff)
        {
            i = ((int32_t)col<<24)|((int32_t)col<<16)|((int32_t)col<<8)|col;
            clearbufbyte((void *)p, dx, i);
        }
        else
            for (i=dx; i>0; i--)
            {
                if (drawlinepat & pow2long[(patc++)&31])
                    drawpixel((char *)p, col);
                d += dy;
                if (d >= dx) { d -= dx; p += pinc; }
                p++;
            }
        enddrawing();   //}}}

        return 1;
    }

    if (y2 < y1)
    {
        i = x1; x1 = x2; x2 = i;
        i = y1; y1 = y2; y2 = i;
    }
    d = 0;
    if (x2 > x1) pinc = 1; else pinc = -1;

    begindrawing(); //{{{
    p = (y1*bytesperline)+x1+frameplace;
    for (i=dy; i>0; i--)
    {
        if (drawlinepat & pow2long[(patc++)&31])
            drawpixel((char *)p, col);
        d += dx;
        if (d >= dy) { d -= dy; p += pinc; }
        p += bytesperline;
    }
    enddrawing();   //}}}

    return 1;
}

static void drawline16mid(int32_t x1, int32_t y1, int32_t x2, int32_t y2, char col)
{
    drawline16(halfxdim16+x1,midydim16+y1, halfxdim16+x2,midydim16+y2, col);
}

// eccen: eccentricity of the ellipse,
//   16384: circle
//  <16384: shrink in y
//  >16384: grow in y
void drawcircle16(int32_t x1, int32_t y1, int32_t r, int32_t eccen, char col)
{
    if (eccen==16384)
    {
        intptr_t p;
        int32_t xp, yp, xpbpl, ypbpl, d, de, dse, patc=0;

        uint32_t uxres = xres, uydim16 = ydim16;

        if (r < 0) r = -r;
        if (x1+r < 0 || x1-r >= xres) return;
        if (y1+r < 0 || y1-r >= ydim16) return;

        /*
         *      d
         *    6 | 7
         *   \  |  /
         *  5  \|/  8
         * c----+----a
         *  4  /|\  1
         *   /  |  \
         *    3 | 2
         *      b
         */

        xp = 0;
        yp = r;
        d = 1 - r;
        de = 2;
        dse = 5 - (r << 1);

        begindrawing();
        p = (y1*bytesperline)+x1+frameplace;

        if (drawlinepat & pow2long[(patc++)&31])
        {
            if ((uint32_t)y1 < uydim16 && (uint32_t)(x1+r) < uxres)
                drawpixel((char *)(p+r), col);    // a
            if ((uint32_t)x1 < uxres   && (uint32_t)(y1+r) < uydim16)
                drawpixel((char *)(p+(r*bytesperline)), col);    // b
            if ((uint32_t)y1 < uydim16 && (uint32_t)(x1-r) < uxres)
                drawpixel((char *)(p-r), col);    // c
            if ((uint32_t)x1 < uxres   && (uint32_t)(y1-r) < uydim16)
                drawpixel((char *)(p-(r*bytesperline)), col);    // d
        }

        do
        {
            if (d < 0)
            {
                d += de;
                de += 2;
                dse += 2;
                xp++;
            }
            else
            {
                d += dse;
                de += 2;
                dse += 4;
                xp++;
                yp--;
            }

            ypbpl = yp*bytesperline;
            xpbpl = xp*bytesperline;
            if (drawlinepat & pow2long[(patc++)&31])
            {
                if ((uint32_t)(x1+yp) < uxres && (uint32_t)(y1+xp) < uydim16)
                    drawpixel_safe((char *)(p+yp+xpbpl), col);   // 1
                if ((uint32_t)(x1+xp) < uxres && (uint32_t)(y1+yp) < uydim16)
                    drawpixel_safe((char *)(p+xp+ypbpl), col);   // 2
                if ((uint32_t)(x1-xp) < uxres && (uint32_t)(y1+yp) < uydim16)
                    drawpixel_safe((char *)(p-xp+ypbpl), col);   // 3
                if ((uint32_t)(x1-yp) < uxres && (uint32_t)(y1+xp) < uydim16)
                    drawpixel_safe((char *)(p-yp+xpbpl), col);   // 4
                if ((uint32_t)(x1-yp) < uxres && (uint32_t)(y1-xp) < uydim16)
                    drawpixel_safe((char *)(p-yp-xpbpl), col);   // 5
                if ((uint32_t)(x1-xp) < uxres && (uint32_t)(y1-yp) < uydim16)
                    drawpixel_safe((char *)(p-xp-ypbpl), col);   // 6
                if ((uint32_t)(x1+xp) < uxres && (uint32_t)(y1-yp) < uydim16)
                    drawpixel_safe((char *)(p+xp-ypbpl), col);   // 7
                if ((uint32_t)(x1+yp) < uxres && (uint32_t)(y1-xp) < uydim16)
                    drawpixel_safe((char *)(p+yp-xpbpl), col);   // 8
            }
        }
        while (yp > xp);
        enddrawing();
    }
    else
    {
        // JonoF's rough approximation of a circle
        int32_t l,spx,spy,lpx,lpy,px,py;

        spx = lpx = x1 + mulscale14(r,sintable[0]);
        spy = lpy = y1 + mulscale14(eccen, mulscale14(r,sintable[512]));

        for (l=64; l<2048; l+=64)
        {
            px = x1 + mulscale14(r,sintable[l]);
            py = y1 + mulscale14(eccen, mulscale14(r,sintable[(l+512)&2047]));

            drawline16(lpx,lpy,px,py,col);

            lpx = px;
            lpy = py;
        }

        drawline16(lpx,lpy,spx,spy,col);
    }
}

//
// qsetmodeany
//
void qsetmodeany(int32_t daxdim, int32_t daydim)
{
    if (daxdim < 640) daxdim = 640;
    if (daydim < 480) daydim = 480;

    if (qsetmode != ((daxdim<<16)|(daydim&0xffff)))
    {
        g_lastpalettesum = 0;
        if (setvideomode(daxdim, daydim, 8, fullscreen) < 0)
            return;

        xdim = xres;
        ydim = yres;

        ydim16 = yres - STATUS2DSIZ2;
        halfxdim16 = xres >> 1;
        midydim16 = ydim16 >> 1; // scale(200,yres,480);

        begindrawing(); //{{{
        Bmemset((char *)frameplace, 0, yres*bytesperline);
        enddrawing();   //}}}
    }

    qsetmode = ((daxdim<<16)|(daydim&0xffff));
}


//
// clear2dscreen
//
void clear2dscreen(void)
{
    int32_t clearsz;

    begindrawing(); //{{{
    if (ydim16 <= yres-STATUS2DSIZ2)
        clearsz = yres - STATUS2DSIZ2;
    else
        clearsz = yres;
    Bmemset((char *)frameplace, 0, bytesperline*clearsz);
    enddrawing();   //}}}
}


////////// editor side view //////////

int32_t scalescreeny(int32_t sy)
{
    if (m32_sideview)
        return mulscale14(sy, m32_sidesin);
    else
        return sy;
}

// return screen coordinates for BUILD coords x and y (relative to current position)
void screencoords(int32_t *xres, int32_t *yres, int32_t x, int32_t y, int32_t zoome)
{
    if (m32_sideview)
        rotatepoint(0,0, x,y, m32_sideang, &x,&y);

    *xres = mulscale14(x,zoome);
    *yres = scalescreeny(mulscale14(y,zoome));
}

#if 0
void invscreencoords(int32_t *dx, int32_t *dy, int32_t sx, int32_t sy, int32_t zoome)
{
    if (m32_sidesin==0 || zoome==0) { *dx=0; *dy=0; return; }

    sy = divscale14(divscale14(sy, m32_sidesin), zoome);
    sx = divscale14(sx, zoome);

    rotatepoint(0,0, sx,sy, -m32_sideang, dx,dy);
}
#endif

// invscreencoords with sx==0 and sy==getscreenvdisp(dz, zoom)
int32_t getinvdisplacement(int32_t *dx, int32_t *dy, int32_t dz)
{
    if (m32_sidesin==0)
        return 1;

    dz = (((int64_t)dz * (int64_t)m32_sidecos)/(int64_t)m32_sidesin)>>4;
    rotatepoint(0,0, 0,dz, -m32_sideang, dx,dy);

    return 0;
}

// return vertical screen coordinate displacement for BUILD z coord
int32_t getscreenvdisp(int32_t bz, int32_t zoome)
{
    return mulscale32(bz,zoome*m32_sidecos);
}

void setup_sideview_sincos()
{
    if (m32_sideview)
    {
        m32_viewplane.x = 0;
        m32_viewplane.y = -512;

        m32_sidesin = sintable[m32_sideelev&2047];
        m32_sidecos = sintable[(m32_sideelev+512)&2047];

        rotatepoint(0,0, m32_viewplane.x,m32_viewplane.y, -m32_sideang, &m32_viewplane.x,&m32_viewplane.y);
        m32_viewplane.x = mulscale14(m32_viewplane.x, m32_sidecos);
        m32_viewplane.y = mulscale14(m32_viewplane.y, m32_sidecos);
        m32_viewplane.z = m32_sidesin>>5;
    }
}

static void sideview_getdist(int16_t sw, int16_t sect)
{
    vec3_t *p;
    vec3_t v;

    if (sw<MAXWALLS)
    {
        v.x = (wall[sw].x + wall[wall[sw].point2].x)>>1;
        v.y = (wall[sw].y + wall[wall[sw].point2].y)>>1;
        v.z = getflorzofslope(sect, v.x, v.y);
        p = &v;
    }
    else
        p = (vec3_t *)&sprite[sw-MAXWALLS];

    m32_sidedist[sw] = p->x*m32_viewplane.x + p->y*m32_viewplane.y + (p->z>>4)*m32_viewplane.z;
}

static int sideview_cmppoints(const void *sw1, const void *sw2)
{
    int32_t dist1 = m32_sidedist[*(int16_t *)sw1];
    int32_t dist2 = m32_sidedist[*(int16_t *)sw2];

    if (dist2>dist1)
        return 1;
    else if (dist1>dist2)
        return -1;

//    if (*sw1<MAXWALLS && *sw2<MAXWALLS)
//        return (wall[*sw2].nextwall>=0) - (wall[*sw1].nextwall>=0);

    return 0;
}

//
// draw2dgrid
//
void draw2dgrid(int32_t posxe, int32_t posye, int32_t posze, int16_t cursectnum, int16_t ange, int32_t zoome, int16_t gride)
{
    int64_t i, xp1, yp1, xp2=0, yp2, tempy;

    UNREFERENCED_PARAMETER(ange);

    if (gride <= 0)
        return;

    begindrawing();	//{{{

    if (m32_sideview)
    {
        int32_t sx1,sy1, sx2,sy2, dx=0,dy=0;
        int32_t xinc=0, yinc=2048>>gride, yofs;

//        yofs = getscreenvdisp((yinc-posze)&((yinc<<4)-1), zoome);
        if (cursectnum<0 || cursectnum>=numsectors)
            yofs = getscreenvdisp(-posze, zoome);
        else
            yofs = getscreenvdisp(getflorzofslope(cursectnum, posxe,posye)-posze, zoome);

        while (scalescreeny(mulscale14(yinc, zoome))==0 && gride>2)
        {
            gride--;
            yinc = 2048>>gride;
        }

        xp2 = xp1 = ((posxe+(1024>>gride))&(((int64_t)(-1))<<(11-gride)));
        yp2 = yp1 = ((posye+(1024>>gride))&(((int64_t)(-1))<<(11-gride)));

        do
        {
            if (xinc==0)
            {
                screencoords(&sx1,&sy1, -editorgridextent-posxe,yp2-posye, zoome);
                if (yp2 == yp1)
                {
                    screencoords(&sx2,&sy2, editorgridextent-posxe,yp2-posye, zoome);
                    dx = sx2-sx1;
                    dy = sy2-sy1;
                }
                yp2 += yinc;
            }
            else  // if (yinc==0)
            {
                screencoords(&sx1,&sy1, xp2-posxe, -editorgridextent-posye, zoome);
                if (xp2 == xp1)
                {
                    screencoords(&sx2,&sy2, xp2-posxe, editorgridextent-posye, zoome);
                    dx = sx2-sx1;
                    dy = sy2-sy1;
                }
                xp2 += xinc;
            }

            i = drawline16(halfxdim16+sx1,midydim16+sy1+yofs, halfxdim16+sx1+dx,midydim16+sy1+dy+yofs, whitecol-25);
            if (i==0 || (xp2<-editorgridextent || xp2>editorgridextent ||
                         yp2<-editorgridextent || yp2>editorgridextent))
            {
                xp2 = xp1;
                yp2 = yp1;

                i = 1;

                if (yinc>0)
                    yinc *= -1;
                else if (yinc<0)
                {
                    xinc = -yinc;
                    yinc = 0;
                }
                else if (xinc>0)
                    xinc *= -1;
                else // if (xinc<0)
                    i = 0;
            }
        }
        while (i);
    }
    else
    {
        // vertical lines
        yp1 = midydim16-mulscale14(posye+editorgridextent,zoome);
        if (yp1 < 0) yp1 = 0;

        yp2 = midydim16-mulscale14(posye-editorgridextent,zoome);
        if (yp2 >= ydim16) yp2 = ydim16-1;

        if ((yp1 < ydim16) && (yp2 >= 0) && (yp2 >= yp1))
        {
            xp1 = halfxdim16-mulscale14(posxe+editorgridextent,zoome);

            for (i=-editorgridextent; i<=editorgridextent; i+=(2048>>gride))
            {
                xp2 = xp1;
                xp1 = halfxdim16-mulscale14(posxe-i,zoome);

                if (xp1 >= xdim)
                    break;

                if (xp1 >= 0)
                {
                    if (xp1 != xp2)
                        drawline16(xp1,yp1,xp1,yp2,whitecol-25);
                }
            }
            if (i >= editorgridextent && xp1 < xdim)
                xp2 = xp1;
            if (xp2 >= 0 && xp2 < xdim)
                drawline16(xp2,yp1, xp2,yp2, whitecol-25);
        }

        // horizontal lines
        xp1 = mulscale14(posxe+editorgridextent,zoome);
        xp2 = mulscale14(posxe-editorgridextent,zoome);
        tempy = 0x80000000l;

        for (i=-editorgridextent; i<=editorgridextent; i+=(2048>>gride))
        {
            yp1 = ((posye-i)*zoome)>>14;
            if (yp1 != tempy)
            {
                if ((yp1 > midydim16-ydim16) && (yp1 <= midydim16))
                {
                    drawline16mid(-xp1,-yp1, -xp2,-yp1, whitecol-25);
                    tempy = yp1;
                }
            }
        }
    }

    enddrawing();   //}}}
}


static void drawscreen_drawwall(int32_t i, int32_t posxe, int32_t posye, int32_t posze, int32_t zoome, int32_t grayp)
{
    const walltype *wal = &wall[i];
    int32_t j, x1, y1, x2, y2, dz = 0, dz2 = 0;
    int32_t fz=0,fzn=0;
//    intptr_t tempint;
    char col;

    int64_t dist,dx,dy;

    j = wal->nextwall;
#if 0
    if (editstatus == 0)
    {
        if ((show2dwall[i>>3]&pow2char[i&7]) == 0) return;
        if ((j >= 0) && (i > j))
            if ((show2dwall[j>>3]&pow2char[j&7]) > 0) return;
    }
    else
#endif
    {
        if (!m32_sideview && !(grayp&2) && (j >= 0) && (i > j)) return;
    }

    if (grayp&1)
    {
        col = 8;
    }
    else if (j < 0)
    {
        col = 15;
        if (i == linehighlight)
            col = (totalclock & 16) ? 15 : 7;
    }
    else
    {
        col = 33;
        if ((wal->cstat&1) != 0)
            col = 5;
        if ((unsigned)wal->nextwall < MAXWALLS && ((wal->cstat^wall[j].cstat)&1))
            col = 2;
        if ((i == linehighlight) || ((linehighlight >= 0) && (i == wall[linehighlight].nextwall)))
            if (totalclock & 16)
                col += (2<<2);
    }

    screencoords(&x1,&y1, wal->x-posxe,wal->y-posye, zoome);
    screencoords(&x2,&y2, wall[wal->point2].x-posxe,wall[wal->point2].y-posye, zoome);

    dx = wal->x-wall[wal->point2].x;
    dy = wal->y-wall[wal->point2].y;
    dist = dx*dx+dy*dy;

    if (dist > INT32_MAX)
    {
        col=9;
        if (i == linehighlight || ((linehighlight >= 0) && (i == wall[linehighlight].nextwall)))
            if (totalclock & 16) col -= (2<<2);
    }
    else if (showfirstwall && searchsector>=0 && (sector[searchsector].wallptr == i ||
             sector[searchsector].wallptr == wall[i].nextwall))
    {
        col = 14;
        if (i == linehighlight) if (totalclock & 16) col -= (2<<2);
    }
    else if (circlewall >= 0 && (i == circlewall || wal->nextwall == circlewall))
        col = 14;

    if (m32_sideview)
    {
        // draw vertical line to neighboring wall
        int32_t fz2;
        int32_t sect = sectorofwall(i);

        fz = getflorzofslope(sect, wal->x,wal->y);
        fz2 = getflorzofslope(sect, wall[wal->point2].x,wall[wal->point2].y);

        dz = getscreenvdisp(fz-posze,zoome);
        dz2 = getscreenvdisp(fz2-posze,zoome);

        y1 += dz;
        y2 += dz2;

        if (wal->nextwall>=0)
        {
            fzn = getflorzofslope(wal->nextsector, wal->x,wal->y);
//            if (i < wall[j].point2)
                drawline16mid(x1,y1, x1,y1+getscreenvdisp(fzn-fz,zoome), editorcolors[col]);
        }
#ifdef YAX_ENABLE
        {
            int16_t nw = yax_getnextwall(i, YAX_CEILING);
            if (nw >= 0)
            {
                int32_t odrawlinepat = drawlinepat;
                fz2 = getflorzofslope(sectorofwall(nw), wall[nw].x,wall[nw].y);
                drawlinepat = 0x11111111;
                drawline16mid(x1,y1, x1,y1+getscreenvdisp(fz2-fz,zoome), editorcolors[col]);
                drawlinepat = odrawlinepat;
            }
        }
#endif

        m32_wallscreenxy[i][0] = halfxdim16+x1;
        m32_wallscreenxy[i][1] = midydim16+y1;
    }

    if (wal->cstat&64)  // if hitscan bit set
    {
        int32_t one=(klabs(x2-x1) >= klabs(y2-y1)), no=!one;

        drawline16mid(x1+no,y1+one, x2+no,y2+one, editorcolors[col]);
        drawline16mid(x1-no,y1-one, x2-no,y2-one, editorcolors[col]);

        col += 8;
    }

    drawline16mid(x1,y1, x2,y2, editorcolors[col]);

    // Draw height indicators at center of walls if requested and if not in
    // side-view mode.
    // XXX: This does not take sloping into account.
    if (showheightindicators && !m32_sideview)
    {
        int32_t dax,day, k=getangle(x1-x2, y1-y2);

        screencoords(&dax,&day,
                     ((wal->x+wall[wal->point2].x)>>1)-posxe,
                     ((wal->y+wall[wal->point2].y)>>1)-posye, zoome);

        if (wal->nextsector >= 0)
        {
            int32_t z1 = sector[sectorofwall(i)].floorz;
            int32_t z2 = sector[wal->nextsector].floorz;

            if (z1 != z2 || showheightindicators == 2)
            {
                // Red walls. Show them on equal-height walls ONLY with setting 2.
                int32_t bb = (z2 < z1);
                int32_t dx = mulscale11(sintable[(k+1024 + 1024*bb)&2047],zoome) / 2560;
                int32_t dy = mulscale11(sintable[(k+512 + 1024*bb)&2047],zoome) / 2560;

                dy = scalescreeny(dy);
                drawline16mid(dax,day, dax+dx,day+dy, editorcolors[col]);
            }
        }
        else if (showheightindicators == 2)
        {
            // Show them on white walls ONLY with setting 2.
            int32_t dx = mulscale11(sintable[(k+2048)&2047],zoome) / 2560;
            int32_t dy = mulscale11(sintable[(k+1536)&2047],zoome) / 2560;

            dy = scalescreeny(dy);
            drawline16mid(dax,day, dax+dx,day+dy, editorcolors[col]);
        }
    }

    if (zoome >= 256 && editstatus == 1)
        if ((halfxdim16+x1 >= 2) && (halfxdim16+x1 <= xdim-3) &&
                (midydim16+y1 >= 2) && (midydim16+y1 <= ydim16-3))
        {
            int32_t pointsize = 2;

            if (i == pointhighlight || ((pointhighlight < MAXWALLS) && (pointhighlight >= 0) &&
                                        (wall[i].x == wall[pointhighlight].x) && (wall[i].y == wall[pointhighlight].y)))
            {
                if (totalclock & 16)
                    pointsize++;
            }
            else //if (highlightcnt > 0)
            {
                if (show2dwall[i>>3]&pow2char[i&7])
                {
                    if (totalclock & 16)
                        pointsize++;
                }
            }

            col = 15;
            if (m32_sideview)
            {
                if (wal->nextwall >= 0)
                {
                    if (fz < fzn)
                        col = 7;
                    else if (fz == fzn)
                        col = 4;
                }
            }

//                    tempint = ((midydim16+y1)*bytesperline)+(halfxdim16+x1)+frameplace;
            do
                drawcircle16(halfxdim16+x1, midydim16+y1, pointsize--, 16384, editorcolors[col]);
            while (pointsize);
        }
}

static void drawscreen_drawsprite(int32_t j, int32_t posxe, int32_t posye, int32_t posze, int32_t zoome)
{
    int32_t x1, y1, x2, y2;
    char col;
    int16_t hitblocking=(sprite[j].cstat&256), flooraligned=(sprite[j].cstat&32), wallaligned=(sprite[j].cstat&16);

    int16_t angofs = m32_sideview ? m32_sideang : 0;

    if (sprite[j].sectnum<0)
        col = 4;  // red
    else
    {
        col = 3;
        if (spritecol2d[sprite[j].picnum][0])
            col = spritecol2d[sprite[j].picnum][0];
        else if ((sprite[j].cstat&1) > 0)
        {
            col = 5;
            if (spritecol2d[sprite[j].picnum][1])
                col = spritecol2d[sprite[j].picnum][1];
        }
    }

    if (editstatus == 1)
    {
        if ((pointhighlight) >= 16384 && (j+16384 == pointhighlight ||
                                          (!m32_sideview && ((sprite[j].x == sprite[pointhighlight-16384].x) &&
                                                  (sprite[j].y == sprite[pointhighlight-16384].y)))))
        {
            if (totalclock & 32) col += 8;
        }
        else // if (highlightcnt > 0)
        {
            if (show2dsprite[j>>3]&pow2char[j&7])
                if (totalclock & 32) col += 8;
        }
    }

    screencoords(&x1,&y1, sprite[j].x-posxe,sprite[j].y-posye, zoome);
//   tempint = ((midydim16+y1)*bytesperline)+(halfxdim16+x1)+frameplace;

    if (m32_sideview)
        y1 += getscreenvdisp(sprite[j].z-posze,zoome);

    if ((halfxdim16+x1 >= 0) && (halfxdim16+x1 < xdim) &&
            (midydim16+y1 >= 0) && (midydim16+y1 < ydim16))
    {
        drawcircle16(halfxdim16+x1, midydim16+y1, 4, 16384, editorcolors[col]);

        x2 = mulscale11(sintable[(sprite[j].ang+angofs+2560)&2047],zoome) / 768;
        y2 = mulscale11(sintable[(sprite[j].ang+angofs+2048)&2047],zoome) / 768;
        y2 = scalescreeny(y2);

        drawline16mid(x1,y1, x1+x2,y1+y2, editorcolors[col]);

        if (hitblocking)
        {
            drawline16mid(x1,y1+1, x1+x2,y1+y2+1, editorcolors[col]);
            drawline16mid(x1,y1-1, x1+x2,y1+y2-1, editorcolors[col]);
            drawline16mid(x1-1,y1, x1+x2-1,y1+y2, editorcolors[col]);
            drawline16mid(x1+1,y1, x1+x2+1,y1+y2, editorcolors[col]);
        }

        if (flooraligned)
        {
            int32_t fx = mulscale10(mulscale6(tilesizx[sprite[j].picnum], sprite[j].xrepeat),zoome) >> 1;
            int32_t fy = mulscale10(mulscale6(tilesizy[sprite[j].picnum], sprite[j].yrepeat),zoome) >> 1;
            int32_t co[4][2], ii, in;
            int32_t sinang = sintable[(sprite[j].ang+angofs+1536)&2047];
            int32_t cosang = sintable[(sprite[j].ang+angofs+1024)&2047];
            int32_t r,s;

            co[0][0] = co[3][0] = -fx;
            co[0][1] = co[1][1] = -fy;
            co[1][0] = co[2][0] = fx;
            co[2][1] = co[3][1] = fy;

            for (ii=3; ii>=0; ii--)
            {
                r = mulscale14(cosang,co[ii][0]) - mulscale14(sinang,co[ii][1]);
                s = mulscale14(sinang,co[ii][0]) + mulscale14(cosang,co[ii][1]);
                s = scalescreeny(s);
                co[ii][0] = r;
                co[ii][1] = s;
            }
            drawlinepat = 0xcfcfcfcf;
            for (ii=3; ii>=0; ii--)
            {
                in = (ii+1)&3;
                drawline16mid(x1+co[ii][0], y1-co[ii][1], x1+co[in][0], y1-co[in][1], editorcolors[col]);
                if (hitblocking)
                {
                    drawline16mid(x1+co[ii][0], y1-co[ii][1]+1, x1+co[in][0], y1-co[in][1]+1, editorcolors[col]);
                    drawline16mid(x1+co[ii][0], y1-co[ii][1]-1, x1+co[in][0], y1-co[in][1]-1, editorcolors[col]);
                    drawline16mid(x1+co[ii][0]+1, y1-co[ii][1], x1+co[in][0]+1, y1-co[in][1], editorcolors[col]);
                    drawline16mid(x1+co[ii][0]-1, y1-co[ii][1], x1+co[in][0]-1, y1-co[in][1], editorcolors[col]);
                }
                drawline16mid(x1, y1,  x1 + co[in][0], y1 - co[in][1],  editorcolors[col]);
            }
            drawlinepat = 0xffffffff;
        }
        else if (wallaligned)
        {
            int32_t fx = mulscale6(tilesizx[sprite[j].picnum], sprite[j].xrepeat);
            int32_t one=(((sprite[j].ang+angofs+256)&512) == 0), no=!one;

            x2 = mulscale11(sintable[(sprite[j].ang+angofs+2560)&2047],zoome) / 6144;
            y2 = mulscale11(sintable[(sprite[j].ang+angofs+2048)&2047],zoome) / 6144;
            y2 = scalescreeny(y2);

            drawline16mid(x1,y1, x1+x2,y1+y2, editorcolors[col]);
            if (!(sprite[j].cstat&64))  // not 1-sided
            {
                drawline16mid(x1,y1, x1-x2,y1-y2, editorcolors[col]);
                if (hitblocking)
                {
                    drawline16mid(x1-no,y1-one, x1-x2-no,y1-y2-one, editorcolors[col]);
                    drawline16mid(x1+no,y1+one, x1-x2+no,y1-y2+one, editorcolors[col]);
                }
            }

            if (hitblocking)
            {
                drawline16mid(x1-no,y1-one, x1+x2-no,y1+y2-one, editorcolors[col]);
                drawline16mid(x1+no,y1+one, x1+x2+no,y1+y2+one, editorcolors[col]);
            }


            x2 = mulscale13(sintable[(sprite[j].ang+angofs+1024)&2047],zoome) * fx / 4096;
            y2 = mulscale13(sintable[(sprite[j].ang+angofs+512)&2047],zoome) * fx / 4096;
            y2 = scalescreeny(y2);

            drawline16mid(x1,y1, x1-x2,y1-y2, editorcolors[col]);
            drawline16mid(x1,y1, x1+x2,y1+y2, editorcolors[col]);

            if (hitblocking)
            {
                drawline16mid(x1+1,y1, x1+x2+1,y1+y2, editorcolors[col]);
                drawline16mid(x1-1,y1, x1-x2-1,y1-y2, editorcolors[col]);
                drawline16mid(x1-1,y1, x1+x2-1,y1+y2, editorcolors[col]);
                drawline16mid(x1+1,y1, x1-x2+1,y1-y2, editorcolors[col]);

                drawline16mid(x1,y1-1, x1+x2,y1+y2-1, editorcolors[col]);
                drawline16mid(x1,y1+1, x1-x2,y1-y2+1, editorcolors[col]);
                drawline16mid(x1,y1+1, x1+x2,y1+y2+1, editorcolors[col]);
                drawline16mid(x1,y1-1, x1-x2,y1-y2-1, editorcolors[col]);
            }
        }
    }
}

//
// draw2dscreen
//
void draw2dscreen(const vec3_t *pos, int16_t cursectnum, int16_t ange, int32_t zoome, int16_t gride)
{
    int32_t i, j, x1, y1;
    int16_t angofs = m32_sideview ? m32_sideang : 0;

    int32_t posxe=pos->x, posye=pos->y, posze=pos->z;
    uint8_t *graybitmap = (uint8_t *)tempbuf;
    int32_t alwaysshowgray = get_alwaysshowgray();

    if (in3dmode()) return;

    setup_sideview_sincos();

    begindrawing(); //{{{


    if (editstatus == 0)
    {
//        faketimerhandler();
        clear2dscreen();

//        faketimerhandler();
        draw2dgrid(posxe,posye,posze,cursectnum,ange,zoome,gride);
    }

    faketimerhandler();

    m32_swcnt = 0;

    if (numgraysects==0)
        Bmemset(graybitmap, 0, (numwalls+7)>>3);
    else
    {
        for (i=0; i<numwalls; i++)
        {
            j = wall[i].nextwall;
            if ((graywallbitmap[i>>3]&(1<<(i&7))) && (j < 0 || (graywallbitmap[j>>3]&(1<<(j&7)))))
                graybitmap[i>>3] |= (1<<(i&7));
            else
                graybitmap[i>>3] &= ~(1<<(i&7));
        }
    }

    if (!m32_sideview)
    {
#ifndef YAX_ENABLE
        for (i=numwalls-1; i>=0; i--)
            drawscreen_drawwall(i,posxe,posye,posze,zoome, 0);
#else
        if (alwaysshowgray)
            for (i=numwalls-1; i>=0; i--)
                if (graybitmap[i>>3]&(1<<(i&7)))
                    drawscreen_drawwall(i,posxe,posye,posze,zoome, 1+2);

        for (i=numwalls-1; i>=0; i--)
            if ((graybitmap[i>>3]&(1<<(i&7)))==0)
                drawscreen_drawwall(i,posxe,posye,posze,zoome, 2);
#endif
    }
    else
    {
        for (i=0; i<numsectors; i++)
            for (j=sector[i].wallptr; j<sector[i].wallptr+sector[i].wallnum; j++)
            {
                m32_wallsprite[m32_swcnt++] = j;
                sideview_getdist(j, i);
            }
        /*
                // j = sector[numsectors-1].wallptr + sector[numsectors-1].wallnum
                for (; j<numwalls; j++)  // new walls ...
                {
                    m32_wallsprite[m32_swcnt++] = j;
                    m32_sidedist[j] = sideview_getdist(j, 0);
                }
        */
    }

    faketimerhandler();

    if (zoome >= 256 || highlightcnt>0)
        for (j=0; j<MAXSPRITES; j++)
            if (sprite[j].statnum<MAXSTATUS)
            {
                // if sprite is highlighted, always draw it
                if ((show2dsprite[j>>3]&pow2char[j&7])==0)
                {
                    if (!m32_sideview && sprite[j].sectnum >= 0)
                        YAX_SKIPSECTOR(sprite[j].sectnum);

                    if (zoome<256)
                        continue;
                }

                if (!m32_sideview)
                    drawscreen_drawsprite(j,posxe,posye,posze,zoome);
                else
                {
                    m32_wallsprite[m32_swcnt++] = MAXWALLS+j;
                    sideview_getdist(MAXWALLS+j, -1);
                }
            }

    faketimerhandler();

    if (m32_sideview)
    {
        qsort(m32_wallsprite, m32_swcnt, sizeof(int16_t), &sideview_cmppoints);

        for (i=0; i<m32_swcnt; i++)  // shouldn't it go the other way around?
        {
            j = m32_wallsprite[i];
            if (j<MAXWALLS)
            {
                if (alwaysshowgray || !(graybitmap[j>>3]&(1<<(j&7))))
                    drawscreen_drawwall(j,posxe,posye,posze,zoome,!!(graybitmap[j>>3]&(1<<(j&7))));
            }
            else
            {
                if (!alwaysshowgray && sprite[j-MAXWALLS].sectnum>=0)
                    YAX_SKIPSECTOR(sprite[j-MAXWALLS].sectnum);

                drawscreen_drawsprite(j-MAXWALLS,posxe,posye,posze,zoome);
            }
        }

        faketimerhandler();
    }

#if 0
    {
        int32_t xx,yy,xx2,yy2;
        screencoords(&xx,&yy, -posxe,-posye, zoome);
        screencoords(&xx2,&yy2, (m32_viewplane.x)-posxe,(m32_viewplane.y)-posye, zoome);
        if (m32_sideview)
            yy2 += getscreenvdisp((m32_viewplane.z<<4)-posze, zoome);

        drawcircle16(halfxdim16+xx, midydim16+yy, 2, 16384, editorcolors[4]); //red
        drawcircle16(halfxdim16+xx2, midydim16+yy2, 2, 16384, editorcolors[14]); //yellow
        drawline16mid(xx,yy, xx2,yy2, editorcolors[15]);
    }
#endif

    x1 = mulscale11(sintable[(ange+angofs+2560)&2047],zoome) / 768; //Draw white arrow
    y1 = mulscale11(sintable[(ange+angofs+2048)&2047],zoome) / 768;

    i = scalescreeny(x1);
    j = scalescreeny(y1);

    drawline16mid(x1,j, -x1,-j, editorcolors[15]);
    drawline16mid(x1,j, +y1,-i, editorcolors[15]);
    drawline16mid(x1,j, -y1,+i, editorcolors[15]);


    enddrawing();   //}}}
}

//
// printext16
//
int32_t printext16(int32_t xpos, int32_t ypos, int16_t col, int16_t backcol, const char *name, char fontsize)
{
    int32_t stx, i, x, y, charxsiz, ocol = col, obackcol = backcol;
    int32_t ymin=0, ymax=7;
    char *fontptr, *letptr, *ptr;
    char smallbuf[4];

    stx = xpos;

    if (ypos<0)
    {
        ymin = 0-ypos;
        if (ymin>7)
            return 0;
    }
    else if (ypos+7 >= ydim)
    {
        ymax = ydim-ypos-1;
        if (ymax<0)
            return 0;
    }

    if (fontsize & 2) printext16(xpos+1, ypos+1, 0, -1, name, (fontsize & ~2) | 4);
    if (fontsize & 1) { fontptr = smalltextfont; charxsiz = 4; }
    else { fontptr = textfont; charxsiz = 8; }

    begindrawing(); //{{{
    for (i=0; name[i]; i++)
    {
        if (name[i] == '^')
        {
            i++;
            if (name[i] == 'O') // ^O resets formatting
            {
                if (fontsize & 4) continue;

                col = ocol;
                backcol = obackcol;
                continue;
            }
            if (isdigit(name[i]))
            {
                if (isdigit(name[i+1]))
                {
                    if (isdigit(name[i+2]))
                    {
                        Bmemcpy(&smallbuf[0],&name[i],3);
                        i += 2;
                        smallbuf[3] = '\0';
                    }
                    else
                    {
                        Bmemcpy(&smallbuf[0],&name[i],2);
                        i++;
                        smallbuf[2] = '\0';
                    }
                }
                else
                {
                    smallbuf[0] = name[i];
                    smallbuf[1] = '\0';
                }
                if (!(fontsize & 4))
                    col = editorcolors[Batol(smallbuf)];

                if (name[i+1] == ',' && isdigit(name[i+2]))
                {
                    i+=2;
                    if (isdigit(name[i+1]))
                    {
                        if (isdigit(name[i+2]))
                        {
                            Bmemcpy(&smallbuf[0],&name[i],3);
                            i += 2;
                            smallbuf[3] = '\0';
                        }
                        else
                        {
                            Bmemcpy(&smallbuf[0],&name[i],2);
                            i++;
                            smallbuf[2] = '\0';
                        }
                    }
                    else
                    {
                        smallbuf[0] = name[i];
                        smallbuf[1] = '\0';
                    }

                    if (!(fontsize & 4))
                        backcol = editorcolors[Batol(smallbuf)];
                }
                continue;
            }
        }

        if (stx<0)
        {
            stx += charxsiz;
            continue;
        }

        letptr = &fontptr[name[i]<<3];
        ptr = (char *)(bytesperline*ypos + (stx-(fontsize&1)) + frameplace);
        for (y=ymin; y<=ymax; y++)
        {
            for (x=0; x<charxsiz; x++)
            {
                if (stx+x >= xdim)
                    break;
                if (letptr[y]&pow2char[7-(fontsize&1)-x])
                    ptr[x] = (uint8_t)col;
                else if (backcol >= 0)
                    ptr[x] = (uint8_t)backcol;
            }
            ptr += bytesperline;
        }
        stx += charxsiz;
        if (stx >= xdim)
            break;
    }
    enddrawing();   //}}}

    return stx;
}


//
// printext256
//
void printext256(int32_t xpos, int32_t ypos, int16_t col, int16_t backcol, const char *name, char fontsize)
{
    int32_t stx, i, x, y, charxsiz;
    char *fontptr, *letptr, *ptr;

    stx = xpos;

    if (fontsize) { fontptr = smalltextfont; charxsiz = 4; }
    else { fontptr = textfont; charxsiz = 8; }

#ifdef USE_OPENGL
    if (!polymost_printext256(xpos,ypos,col,backcol,name,fontsize)) return;
# if 0
    if (getrendermode() >= REND_POLYMOST && in3dmode())
    {
        int32_t xx, yy;
        int32_t lc=-1;
        palette_t p=getpal(col), b=getpal(backcol);

        setpolymost2dview();
        bglDisable(GL_ALPHA_TEST);
        bglDepthMask(GL_FALSE);	// disable writing to the z-buffer

        bglBegin(GL_POINTS);

        for (i=0; name[i]; i++)
        {
            // TODO: factor out!
            if (name[i] == '^' && isdigit(name[i+1]))
            {
                char smallbuf[8];
                int32_t bi=0;

                while (isdigit(name[i+1]) && bi<3)
                {
                    smallbuf[bi++]=name[i+1];
                    i++;
                }
                smallbuf[bi++]=0;
                if (col)
                    col = Batol(smallbuf);

                p = getpal(col);

                continue;
            }
            letptr = &fontptr[name[i]<<3];
            xx = stx-fontsize;
            yy = ypos+7 + 2; //+1 is hack!
            for (y=7; y>=0; y--)
            {
                for (x=charxsiz-1; x>=0; x--)
                {
                    if (letptr[y]&pow2char[7-fontsize-x])
                    {
                        if (lc!=col)
                            bglColor4ub(p.r,p.g,p.b,255);
                        lc = col;
                        bglVertex2i(xx+x,yy);
                    }
                    else if (backcol >= 0)
                    {
                        if (lc!=backcol)
                            bglColor4ub(b.r,b.g,b.b,255);
                        lc = backcol;
                        bglVertex2i(xx+x,yy);
                    }
                }
                yy--;
            }
            stx += charxsiz;
        }

        bglEnd();
        bglDepthMask(GL_TRUE);  // re-enable writing to the z-buffer

        return;
    }
# endif
#endif

    begindrawing(); //{{{
    for (i=0; name[i]; i++)
    {
        if (name[i] == '^' && isdigit(name[i+1]))
        {
            char smallbuf[8];
            int32_t bi=0;
            while (isdigit(name[i+1]) && bi<3)
            {
                smallbuf[bi++]=name[i+1];
                i++;
            }
            smallbuf[bi++]=0;
            if (col)col = Batol(smallbuf);
            continue;
        }

        if (stx-fontsize+charxsiz > xdim)
            break;

        letptr = &fontptr[name[i]<<3];
        ptr = (char *)(ylookup[ypos+7]+(stx-fontsize)+frameplace);
        for (y=7; y>=0; y--)
        {
            for (x=charxsiz-1; x>=0; x--)
            {
                if (letptr[y]&pow2char[7-fontsize-x])
                    ptr[x] = (uint8_t)col;
                else if (backcol >= 0)
                    ptr[x] = (uint8_t)backcol;
            }
            ptr -= ylookup[1];
        }
        stx += charxsiz;
    }
    enddrawing();   //}}}
}


//
// screencapture
//

static int32_t screencapture_common1(char *fn, const char *ext, BFILE** filptr)
{
    int32_t i;

    do      // JBF 2004022: So we don't overwrite existing screenshots
    {
        if (capturecount > 9999) return -1;

        i = Bstrrchr(fn,'.')-fn-4;
        fn[i++] = ((capturecount/1000)%10)+48;
        fn[i++] = ((capturecount/100)%10)+48;
        fn[i++] = ((capturecount/10)%10)+48;
        fn[i++] = (capturecount%10)+48;
        i++;
        Bstrcpy(&fn[i], ext);

        if ((*filptr = Bfopen(fn,"rb")) == NULL) break;
        Bfclose(*filptr);
        capturecount++;
    }
    while (1);

    *filptr = Bfopen(fn,"wb");
    if (*filptr == NULL)
        return -1;

    return 0;
}

#ifdef USE_LIBPNG
// PNG screenshots -- adapted from libpng example.c
static int32_t screencapture_png(const char *filename, char inverseit, const char *versionstr)
{
    int32_t i;
    BFILE *fp;
# ifdef USE_OPENGL
#  define HICOLOR (getrendermode() >= REND_POLYMOST && in3dmode())
# else
#  define HICOLOR 0
# endif
    png_structp png_ptr;
    png_infop info_ptr;
    png_colorp palette = NULL;
    png_textp text = NULL;

    png_bytep buf = NULL;
    png_bytepp rowptrs = NULL;

    char fn[32];  // careful...

    Bstrcpy(fn, filename);
    i = screencapture_common1(fn, "png", &fp);
    if (i)
        return i;

    /* Create and initialize the png_struct with default error handling. */
    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
    if (png_ptr == NULL)
    {
        Bfclose(fp);
        return -1;
    }

    /* Allocate/initialize the image information data. */
    info_ptr = png_create_info_struct(png_ptr);
    if (info_ptr == NULL)
    {
        Bfclose(fp);
        png_destroy_write_struct(&png_ptr, NULL);
        return -1;
    }

    /* Set error handling. */
    if (setjmp(png_jmpbuf(png_ptr)))
    {
        /* If we get here, we had a problem writing the file */
        Bfclose(fp);
        if (palette) png_free(png_ptr, palette);
        if (text) png_free(png_ptr, text);
        if (buf) png_free(png_ptr, buf);
        if (rowptrs) png_free(png_ptr, rowptrs);
        png_destroy_write_struct(&png_ptr, &info_ptr);

        return -1;
    }

    png_init_io(png_ptr, fp);

    // initialize various info fields from here on
    png_set_IHDR(png_ptr, info_ptr, xdim, ydim, 8,
                 HICOLOR ? PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_PALETTE,
                 PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);

    if (HICOLOR && editstatus==0)
        png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, PNG_FILTER_VALUE_NONE);

    if (!HICOLOR)
	#if (PNG_LIBPNG_VER > 10599)
        palette = (png_colorp)png_malloc(png_ptr, 256*sizeof(png_color));
	#else
        palette = (png_colorp)png_malloc(png_ptr, 256*png_sizeof(png_color));
	#endif

    if (palette)
    {
        for (i=0; i<256; i++)
        {
            palette[i].red = inverseit ? 255-curpalettefaded[i].r : curpalettefaded[i].r;
            palette[i].green = inverseit ? 255-curpalettefaded[i].g : curpalettefaded[i].g;
            palette[i].blue = inverseit ? 255-curpalettefaded[i].b : curpalettefaded[i].b;
        }

        png_set_PLTE(png_ptr, info_ptr, palette, 256);
    }

//    png_set_gAMA(png_ptr, info_ptr, vid_gamma);  // 1.0/vid_gamma ?
//    png_set_sRGB(png_ptr, info_ptr, PNG_sRGB_INTENT_SATURATION);  // hm...

    #if (PNG_LIBPNG_VER > 10599)
    text = (png_textp)png_malloc(png_ptr, 2*sizeof(png_text));
    #else
    text = (png_textp)png_malloc(png_ptr, 2*png_sizeof(png_text));
    #endif
    text[0].compression = PNG_TEXT_COMPRESSION_NONE;
    text[0].key = "Title";
    text[0].text = (png_charp)(editstatus ? "Mapster32 screenshot" : "EDuke32 screenshot");

    text[1].compression = PNG_TEXT_COMPRESSION_NONE;
    text[1].key = "Software";
    text[1].text = (char *)versionstr;
    png_set_text(png_ptr, info_ptr, text, 2);

    // get/set the pixel data
    begindrawing(); //{{{
    if (palette)
    {
        buf = (png_bytep)png_malloc(png_ptr, bytesperline*ydim);
        Bmemcpy(buf, (char *)frameplace, bytesperline*ydim);
    }
# ifdef USE_OPENGL
    else
    {
        buf = (png_bytep)png_malloc(png_ptr, xdim*ydim*3);
        bglReadPixels(0,0,xdim,ydim,GL_RGB,GL_UNSIGNED_BYTE,buf);
    }
# endif
    enddrawing(); //}}}

    rowptrs = (png_bytepp)png_malloc(png_ptr, ydim*sizeof(png_bytep));

    if (!palette)
    {
        for (i=0; i<ydim; i++)
            rowptrs[i] = &buf[3*xdim*(ydim-i-1)];
    }
    else
    {
        for (i=0; i<ydim; i++)
            rowptrs[i] = &buf[ylookup[i]];
    }
    png_set_rows(png_ptr, info_ptr, rowptrs);

    // write the png file!
    png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);

    Bfclose(fp);
    if (palette) png_free(png_ptr, palette);
    if (text) png_free(png_ptr, text);
    if (buf) png_free(png_ptr, buf);
    if (rowptrs) png_free(png_ptr, rowptrs);
    png_destroy_write_struct(&png_ptr, &info_ptr);

    OSD_Printf("Saved screenshot to %s\n", fn);
    capturecount++;
    return 0;
}
# undef HICOLOR

#else  // if !defined USE_LIBPNG

static int32_t screencapture_tga(const char *filename, char inverseit)
{
    int32_t i;
    char *ptr, head[18] = { 0,1,1,0,0,0,1,24,0,0,0,0,0/*wlo*/,0/*whi*/,0/*hlo*/,0/*hhi*/,8,0 };
    //char palette[4*256];
    char *fn = Bstrdup(filename);
# ifdef USE_OPENGL
    int32_t j;
    char *inversebuf;
# endif
    BFILE *fil;

    i = screencapture_common1(fn, "tga", &fil);
    if (i)
    {
        Bfree(fn);
        return i;
    }

# ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST && in3dmode())
    {
        head[1] = 0;    // no colourmap
        head[2] = 2;    // uncompressed truecolour
        head[3] = 0;    // (low) first colourmap index
        head[4] = 0;    // (high) first colourmap index
        head[5] = 0;    // (low) number colourmap entries
        head[6] = 0;    // (high) number colourmap entries
        head[7] = 0;    // colourmap entry size
        head[16] = 24;  // 24 bits per pixel
    }
# endif

    head[12] = xdim & 0xff;
    head[13] = (xdim >> 8) & 0xff;
    head[14] = ydim & 0xff;
    head[15] = (ydim >> 8) & 0xff;

    Bfwrite(head, 18, 1, fil);

    begindrawing(); //{{{
    ptr = (char *)frameplace;

    // palette first
# ifdef USE_OPENGL
    if (getrendermode() < REND_POLYMOST || (getrendermode() >= REND_POLYMOST && !in3dmode()))
# endif
    {
        //getpalette(0,256,palette);
        for (i=0; i<256; i++)
        {
            Bfputc(inverseit ? 255-curpalettefaded[i].b : curpalettefaded[i].b, fil);  // b
            Bfputc(inverseit ? 255-curpalettefaded[i].g : curpalettefaded[i].g, fil);  // g
            Bfputc(inverseit ? 255-curpalettefaded[i].r : curpalettefaded[i].r, fil);  // r
        }
    }

# ifdef USE_OPENGL
    if (getrendermode() >= REND_POLYMOST && in3dmode())
    {
        char c;
        // 24bit
        inversebuf = (char *)Bmalloc(xdim*ydim*3);
        if (inversebuf)
        {
            bglReadPixels(0,0,xdim,ydim,GL_RGB,GL_UNSIGNED_BYTE,inversebuf);
            j = xdim*ydim*3;
            for (i=0; i<j; i+=3)
            {
                c = inversebuf[i];
                inversebuf[i] = inversebuf[i+2];
                inversebuf[i+2] = c;
            }
            Bfwrite(inversebuf, xdim*ydim, 3, fil);
            Bfree(inversebuf);
        }
    }
    else
# endif
    {
        for (i=ydim-1; i>=0; i--)
            Bfwrite(ptr+i*bytesperline, xdim, 1, fil);
    }

    enddrawing();   //}}}

    Bfclose(fil);
    OSD_Printf("Saved screenshot to %s\n", fn);
    Bfree(fn);
    capturecount++;
    return(0);
}
# endif


int32_t screencapture(const char *filename, char inverseit, const char *versionstr)
{
#ifndef USE_LIBPNG
    UNREFERENCED_PARAMETER(versionstr);
    return screencapture_tga(filename,inverseit);
#else
    return screencapture_png(filename,inverseit,versionstr);
#endif
}



//
// setrendermode
//
int32_t setrendermode(int32_t renderer)
{
    UNREFERENCED_PARAMETER(renderer);
#ifdef USE_OPENGL
    if (bpp == 8) renderer = 0;
# ifdef POLYMER
    else renderer = min(4,max(3,renderer));

    if (renderer == 4)
    {
        int32_t i;

        // potentially deferred MD3 postprocessing
        for (i=0; i<nextmodelid; i++)
        {
            if (models[i]->mdnum==3 && ((md3model_t *)models[i])->head.surfs[0].geometry == NULL)
            {
                static int32_t warned=0;

                if (!warned)
                {
                    OSD_Printf("Post-processing MD3 models for Polymer. This can take a while...\n");
                    nextpage();
                    warned = 1;
                }

                if (!md3postload_polymer((md3model_t *)models[i]))
                    OSD_Printf("INTERNAL ERROR: mdmodel %s failed postprocessing!\n",
                               ((md3model_t *)models[i])->head.nam);

                if (((md3model_t *)models[i])->head.surfs[0].geometry == NULL)
                    OSD_Printf("INTERNAL ERROR: wtf?\n");
            }
//            else
//                OSD_Printf("mdmodel %d already postprocessed.\n", i);
        }

        if (!polymer_init())
            renderer = 3;
    }
    else if (getrendermode() == REND_POLYMER)  // going from Polymer to another renderer
    {
        delete_maphack_lights();
        G_Polymer_UnInit();
        polymer_uninit();
    }
# else
    else renderer = 3;
# endif

    basepalreset = 1;

    rendmode = renderer;
    if (getrendermode() >= REND_POLYMOST)
        glrendmode = rendmode;
#endif

    return 0;
}

//
// setrollangle
//
#ifdef USE_OPENGL
void setrollangle(int32_t rolla)
{
    UNREFERENCED_PARAMETER(rolla);
    if (rolla == 0) gtang = 0.0;
    else gtang = PI * (double)rolla / 1024.0;
}
#endif


//
// invalidatetile
//  pal: pass -1 to invalidate all palettes for the tile, or >=0 for a particular palette
//  how: pass -1 to invalidate all instances of the tile in texture memory, or a bitfield
//         bit 0: opaque or masked (non-translucent) texture, using repeating
//         bit 1: ignored
//         bit 2: ignored (33% translucence, using repeating)
//         bit 3: ignored (67% translucence, using repeating)
//         bit 4: opaque or masked (non-translucent) texture, using clamping
//         bit 5: ignored
//         bit 6: ignored (33% translucence, using clamping)
//         bit 7: ignored (67% translucence, using clamping)
//       clamping is for sprites, repeating is for walls
//
void invalidatetile(int16_t tilenume, int32_t pal, int32_t how)
{
#ifdef USE_OPENGL
    int32_t numpal, firstpal, np;
    int32_t hp;

    if (getrendermode() < REND_POLYMOST) return;

    if (pal < 0)
    {
        numpal = MAXPALOOKUPS;
        firstpal = 0;
    }
    else
    {
        numpal = 1;
        firstpal = pal % MAXPALOOKUPS;
    }

    for (hp = 0; hp < 8; hp+=4)
    {
        if (!(how & pow2long[hp])) continue;

        for (np = firstpal; np < firstpal+numpal; np++)
        {
            gltexinvalidate(tilenume, np, hp);
        }
    }
#endif
    UNREFERENCED_PARAMETER(tilenume);
    UNREFERENCED_PARAMETER(pal);
    UNREFERENCED_PARAMETER(how);
}


//
// setpolymost2dview
//  Sets OpenGL for 2D drawing
//
void setpolymost2dview(void)
{
#ifdef USE_OPENGL
    if (getrendermode() < REND_POLYMOST) return;

    bglViewport(0,0,xres,yres);
    bglMatrixMode(GL_PROJECTION);
    bglLoadIdentity();
    bglOrtho(0,xres,yres,0,-1,1);
    bglMatrixMode(GL_MODELVIEW);
    bglLoadIdentity();

    gloy1 = -1;

    bglDisable(GL_DEPTH_TEST);
    bglDisable(GL_TEXTURE_2D);
    bglDisable(GL_BLEND);
#endif
}

void hash_init(hashtable_t *t)
{
    hash_free(t);
    t->items=(hashitem_t **)Bcalloc(1, t->size * sizeof(hashitem_t));
}

void hash_free(hashtable_t *t)
{
    hashitem_t *cur, *tmp;
    int32_t i;
    int32_t num;

    if (t->items == NULL)
        return;
//    initprintf("*free, num:%d\n",t->size);
    i= t->size-1;
    do
    {
        cur = t->items[i];
        num = 0;
        while (cur)
        {
            tmp = cur;
            cur = cur->next;
//          initprintf("Free %4d \"%s\"\n",tmp->key,(tmp->string)?tmp->string:".");
            if (tmp->string)
            {
                Bfree(tmp->string);
                tmp->string = NULL;
            }
            Bfree(tmp);
            num++;
        }
//        initprintf("#%4d: %3d\t",i,num);
    }
    while (--i > -1);
    Bfree(t->items);
    t->items = 0;
}

// djb3 algorithm
static inline uint32_t hash_getcode(const char *s)
{
    uint32_t h = 5381;
    int32_t ch;

    while ((ch = *s++) != '\0')
        h = ((h << 5) + h) ^ ch;

    return h;
}

void hash_add(hashtable_t *t, const char *s, int32_t key, int32_t replace)
{
    hashitem_t *cur, *prev=NULL;
    int32_t code;

    if (t->items == NULL)
    {
        initprintf("hash_add(): table not initialized!\n");
        return;
    }

    code = hash_getcode(s) % t->size;
    cur = t->items[code];

    if (!cur)
    {
        cur = (hashitem_t *)Bcalloc(1,sizeof(hashitem_t));
        cur->string = Bstrdup(s);
        cur->key = key;
        cur->next = NULL;
        t->items[code] = cur;
        return;
    }

    do
    {
        if (Bstrcmp(s,cur->string) == 0)
        {
            if (replace) cur->key = key;
            return;
        }
        prev = cur;
    }
    while ((cur = cur->next));

    cur = (hashitem_t *)Bcalloc(1,sizeof(hashitem_t));
    cur->string = Bstrdup(s);
    cur->key = key;
    cur->next = NULL;
    prev->next = cur;
}

// delete at most once
void hash_delete(hashtable_t *t, const char *s)
{
    hashitem_t *cur, *prev=NULL;
    int32_t code;

    if (t->items == NULL)
    {
        initprintf("hash_delete(): table not initialized!\n");
        return;
    }

    code = hash_getcode(s) % t->size;
    cur = t->items[code];

    if (!cur)
        return;

    do
    {
        if (Bstrcmp(s,cur->string) == 0)
        {
            Bfree(cur->string);

            if (!prev)
                t->items[code] = cur->next;
            else
                prev->next = cur->next;

            Bfree(cur);

            return;
        }
        prev = cur;
    }
    while ((cur = cur->next));
}

int32_t hash_find(const hashtable_t *t, const char *s)
{
    hashitem_t *cur;

    if (t->items == NULL)
    {
        initprintf("hash_find(): table not initialized!\n");
        return -1;
    }

    if ((cur = t->items[hash_getcode(s) % t->size]) == NULL) return -1;

    do
        if (Bstrcmp(s,cur->string) == 0)
            return cur->key;
    while ((cur = cur->next));

    return -1;
}

int32_t hash_findcase(const hashtable_t *t, const char *s)
{
    hashitem_t *cur;

    if (t->items == NULL)
    {
        initprintf("hash_findcase(): table not initialized!\n");
        return -1;
    }

    if ((cur=t->items[hash_getcode(s)%t->size]) == NULL) return -1;

    do
        if (Bstrcasecmp(s,cur->string) == 0)
            return cur->key;
    while ((cur=cur->next));

    return -1;
}

/*
 * vim:ts=8:
 */

