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# OgreTerrainRenderable.h

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    00001 /*
    00002 -----------------------------------------------------------------------------
    00003 This source file is part of OGRE
    00004 (Object-oriented Graphics Rendering Engine)
    00005 For the latest info, see http://www.ogre3d.org/
    00006
    00007 Copyright © 2000-2004 The OGRE Team
    00008 Also see acknowledgements in Readme.html
    00009
    00010 This program is free software; you can redistribute it and/or modify it under
    00011 the terms of the GNU Lesser General Public License as published by the Free Software
    00012 Foundation; either version 2 of the License, or (at your option) any later
    00013 version.
    00014
    00015 This program is distributed in the hope that it will be useful, but WITHOUT
    00016 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
    00017 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
    00018
    00019 You should have received a copy of the GNU Lesser General Public License along with
    00020 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
    00021 Place - Suite 330, Boston, MA 02111-1307, USA, or go to
    00022 http://www.gnu.org/copyleft/lesser.txt.
    00023 -----------------------------------------------------------------------------
    00024 */
    00025 /***************************************************************************
    00026 terrainrenderable.h  -  description
    00027 -------------------
    00028 begin                : Sat Oct 5 2002
    00029 copyright            : (C) 2002 by Jon Anderson
    00030 email                : janders@users.sf.net
    00031
    00032 Enhancements 2003 - 2004 (C) The OGRE Team
    00033
    00034 ***************************************************************************/
    00035
    00036 #ifndef TERRAINRENDERABLE_H
    00037 #define TERRAINRENDERABLE_H
    00038
    00039 #include "OgreTerrainPrerequisites.h"
    00040 #include <OgreRenderable.h>
    00041 #include <OgreMovableObject.h>
    00042 #include <OgreAxisAlignedBox.h>
    00043 #include <OgreString.h>
    00044 #include <OgreHardwareBufferManager.h>
    00045
    00046 #include <vector>
    00047
    00048 #define MORPH_CUSTOM_PARAM_ID 77
    00049
    00050 namespace Ogre
    00051 {
    00052
    00053     typedef std::map <unsigned int, IndexData* > IndexMap;
    00054     typedef std::vector < IndexData* > IndexArray;
    00055     typedef std::vector < IndexMap* > LevelArray;
    00056
    00061     class TerrainBufferCache
    00062     {
    00063     public:
    00064         void shutdown(void)
    00065         {
    00066             for( size_t i=0; i<mCache.size(); i++ )
    00067             {
    00068                 delete mCache[i];
    00069             }
    00070             mCache.clear();
    00071         }
    00072         ~TerrainBufferCache()
    00073         {
    00074             shutdown();
    00075         }
    00076
    00077         IndexArray mCache;
    00078     };
    00079
    00080     inline Real _max( Real x, Real y )
    00081     {
    00082         return ( x > y ) ? x : y;
    00083     }
    00084
    00088     class TerrainOptions
    00089     {
    00090     public:
    00091         TerrainOptions()
    00092         {
    00093             pageSize = 0;
    00094             tileSize = 0;
    00095             tilesPerPage = 0;
    00096             maxGeoMipMapLevel = 0;
    00097             scale = Vector3::UNIT_SCALE;
    00098             maxPixelError = 4;
    00099             detailTile = 1;
    00100             lit = false;
    00101             coloured = false;
    00102             lodMorph = false;
    00103             lodMorphStart = 0.5;
    00104             useTriStrips = false;
    00105             primaryCamera = 0;
    00106             terrainMaterial = 0;
    00107         };
    00109         size_t pageSize;
    00111         size_t tileSize;
    00113         size_t tilesPerPage;
    00115         const Camera* primaryCamera;
    00117         size_t maxGeoMipMapLevel;
    00120         Vector3 scale;
    00122         size_t maxPixelError;
    00124         bool useTriStrips;
    00126         size_t detailTile;
    00128         bool lodMorph;
    00130         Real lodMorphStart;
    00132         bool lit;
    00134         bool coloured;
    00136         Material *terrainMaterial;
    00137
    00138     };
    00139
    00140 #define STITCH_NORTH_SHIFT 0
    00141 #define STITCH_SOUTH_SHIFT 8
    00142 #define STITCH_WEST_SHIFT  16
    00143 #define STITCH_EAST_SHIFT  24
    00144
    00145 #define STITCH_NORTH  128 << STITCH_NORTH_SHIFT
    00146 #define STITCH_SOUTH  128 << STITCH_SOUTH_SHIFT
    00147 #define STITCH_WEST   128 << STITCH_WEST_SHIFT
    00148 #define STITCH_EAST   128 << STITCH_EAST_SHIFT
    00149
    00158     class _OgreTerrainExport TerrainRenderable : public Renderable, public MovableObject
    00159     {
    00160     public:
    00161
    00162         TerrainRenderable(const String& name);
    00163         ~TerrainRenderable();
    00164
    00165         void deleteGeometry();
    00166
    00167         enum Neighbor
    00168         {
    00169             NORTH = 0,
    00170             SOUTH = 1,
    00171             EAST = 2,
    00172             WEST = 3,
    00173             HERE = 4
    00174         };
    00175
    00182         void initialise(int startx, int startz, Real* pageHeightData);
    00183
    00184         //movable object methods
    00186         virtual const String& getName( void ) const
    00187         {
    00188             return mName;
    00189         };
    00190
    00192         virtual const String& getMovableType( void ) const
    00193         {
    00194             return mType;
    00195         };
    00196
    00198         const AxisAlignedBox& getBoundingBox( void ) const
    00199         {
    00200             return mBounds;
    00201         };
    00202
    00204         virtual void _notifyCurrentCamera( Camera* cam );
    00205
    00206         virtual void _updateRenderQueue( RenderQueue* queue );
    00207
    00214         virtual void getRenderOperation( RenderOperation& rend );
    00215
    00216         virtual Material* getMaterial( void ) const
    00217         {
    00218             return mMaterial;
    00219         };
    00220
    00221         virtual void getWorldTransforms( Matrix4* xform ) const;
    00222
    00223         virtual const Quaternion& getWorldOrientation(void) const;
    00224         virtual const Vector3& getWorldPosition(void) const;
    00225
    00227         inline int getRenderLevel() const
    00228         {
    00229             return mRenderLevel;
    00230         };
    00231
    00233         inline void setForcedRenderLevel( int i )
    00234         {
    00235             mForcedRenderLevel = i;
    00236         }
    00237
    00239         void _getNormalAt( float x, float y, Vector3 * result );
    00240
    00242         float getHeightAt( float x, float y );
    00243
    00246         bool intersectSegment( const Vector3 & start, const Vector3 & end, Vector3 * result );
    00247
    00251         void _setNeighbor( Neighbor n, TerrainRenderable *t )
    00252         {
    00253             mNeighbors[ n ] = t;
    00254         };
    00255
    00258         TerrainRenderable * _getNeighbor( Neighbor n )
    00259         {
    00260             return mNeighbors[ n ];
    00261         }
    00262
    00263
    00264         void setMaterial( Material *m )
    00265         {
    00266             mMaterial = m;
    00267         };
    00268
    00270         void _calculateNormals();
    00271
    00272
    00273
    00274
    00277         void _generateVertexLighting( const Vector3 &sun, ColourValue ambient );
    00278
    00279
    00281         Real getSquaredViewDepth(const Camera* cam) const;
    00282
    00284         Real getBoundingRadius(void) const { return 0; /* not needed */ }
    00285
    00287         const LightList& getLights(void) const;
    00288
    00290         void _updateCustomGpuParameter(
    00291             const GpuProgramParameters::AutoConstantEntry& constantEntry,
    00292             GpuProgramParameters* params) const;
    00294         static TerrainBufferCache& _getIndexCache(void) {return msIndexCache;}
    00295     protected:
    00297         static TerrainBufferCache msIndexCache;
    00299         static const TerrainOptions* msOptions;
    00300
    00302         inline size_t _index( int x, int z ) const
    00303         {
    00304             return ( x + z * msOptions->tileSize );
    00305         };
    00306
    00308         inline float _vertex( int x, int z, int n )
    00309         {
    00310             return mPositionBuffer[x * 3 + z * msOptions->tileSize * 3 + n];
    00311         };
    00312
    00313
    00314         inline int _numNeighbors() const
    00315         {
    00316             int n = 0;
    00317
    00318             for ( int i = 0; i < 4; i++ )
    00319             {
    00320                 if ( mNeighbors[ i ] != 0 )
    00321                     n++;
    00322             }
    00323
    00324             return n;
    00325         }
    00326
    00327         inline bool _hasNeighborRenderLevel( int i ) const
    00328         {
    00329             for ( int j = 0; j < 4; j++ )
    00330             {
    00331                 if ( mNeighbors[ j ] != 0 && mNeighbors[ j ] ->mRenderLevel == i )
    00332                     return true;
    00333             }
    00334
    00335             return false;
    00336
    00337         }
    00338
    00339         void _adjustRenderLevel( int i );
    00340
    00341         void _initLevelIndexes();
    00342         void _destroyLevelIndexes();
    00343
    00344         bool _checkSize( int n );
    00345
    00346         void _calculateMinLevelDist2( Real C );
    00347
    00348         Real _calculateCFactor();
    00349
    00350         VertexData* mTerrain;
    00351
    00353         int mRenderLevel;
    00355         int mLastNextLevel;
    00357         Real mLODMorphFactor;
    00359         Real *mMinLevelDistSqr;
    00361         TerrainRenderable *mNeighbors [ 4 ];
    00363         AxisAlignedBox mBounds;
    00365         Vector3 mCenter;
    00367         String mName;
    00369         static String mType;
    00371         Material *mMaterial;
    00373         bool mInit;
    00375         static LevelArray mLevelIndex;
    00377         static bool mLevelInit;
    00379         HardwareVertexBufferSharedPtr mMainBuffer;
    00381         HardwareVertexBufferSharedPtr* mDeltaBuffers;
    00383         Real* mPositionBuffer;
    00385         int mForcedRenderLevel;
    00388         int mNextLevelDown[10];
    00390         IndexData* getIndexData(void);
    00392         IndexData* generateTriStripIndexes(unsigned int stitchFlags);
    00394         IndexData* generateTriListIndexes(unsigned int stitchFlags);
    00409         int stitchEdge(Neighbor neighbor, int hiLOD, int loLOD,
    00410             bool omitFirstTri, bool omitLastTri, unsigned short** ppIdx);
    00411
    00413         HardwareVertexBufferSharedPtr createDeltaBuffer(void);
    00414
    00415     };
    00416
    00417 }
    00418
    00419 #endif

Copyright © 2002-2003 by The OGRE Team
Last modified Sun Nov 28 19:48:49 2004