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# OgreProgressiveMesh.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 © 2000-2002 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 // The underlying algorithms in this class are based heavily on:
    00026 /*
    00027  *  Progressive Mesh type Polygon Reduction Algorithm
    00028  *  by Stan Melax (c) 1998
    00029  */
    00030
    00031 #ifndef __ProgressiveMesh_H_
    00032 #define __ProgressiveMesh_H_
    00033
    00034 #include "OgrePrerequisites.h"
    00035 #include "OgreVector3.h"
    00036 #include "OgreHardwareVertexBuffer.h"
    00037 #include "OgreHardwareIndexBuffer.h"
    00038 #include "OgreRenderOperation.h"
    00039
    00040 namespace Ogre {
    00041
    00055     class _OgreExport ProgressiveMesh
    00056     {
    00057     public:
    00058
    00060         enum VertexReductionQuota
    00061         {
    00063             VRQ_CONSTANT,
    00065             VRQ_PROPORTIONAL
    00066         };
    00067
    00068         typedef std::vector<IndexData*> LODFaceList;
    00069
    00077         ProgressiveMesh(const VertexData* vertexData, const IndexData* indexData);
    00078         virtual ~ProgressiveMesh();
    00079
    00095         virtual void addExtraVertexPositionBuffer(const VertexData* vertexData);
    00096
    00105         virtual void build(ushort numLevels, LODFaceList* outList,
    00106             VertexReductionQuota quota = VRQ_PROPORTIONAL, Real reductionValue = 0.5f );
    00107
    00108     protected:
    00109         const VertexData *mpVertexData;
    00110         const IndexData *mpIndexData;
    00111
    00112         size_t mCurrNumIndexes;
    00113         size_t mNumCommonVertices;
    00114
    00115         // Internal classes
    00116         class PMTriangle;
    00117         class PMVertex;
    00118
    00119         public: // VC6 hack
    00120
    00123         class PMFaceVertex {
    00124         public:
    00125             size_t realIndex;
    00126             PMVertex* commonVertex;
    00127         };
    00128
    00129         protected:
    00130
    00132         class PMTriangle {
    00133         public:
    00134             PMTriangle();
    00135             void setDetails(size_t index, PMFaceVertex *v0, PMFaceVertex *v1, PMFaceVertex *v2);
    00136             void computeNormal(void);
    00137             void replaceVertex(PMFaceVertex *vold, PMFaceVertex *vnew);
    00138             bool hasCommonVertex(PMVertex *v) const;
    00139             bool hasFaceVertex(PMFaceVertex *v) const;
    00140             PMFaceVertex* getFaceVertexFromCommon(PMVertex* commonVert);
    00141             void notifyRemoved(void);
    00142
    00143             PMFaceVertex* vertex[3]; // the 3 points that make this tri
    00144             Vector3   normal;    // unit vector othogonal to this face
    00145             bool      removed;   // true if this tri is now removed
    00146             size_t index;
    00147         };
    00148
    00155         class PMVertex {
    00156         public:
    00157             PMVertex();
    00158             void setDetails(const Vector3& v, size_t index);
    00159             void removeIfNonNeighbor(PMVertex *n);
    00160             bool isBorder(void);
    00161             bool isManifoldEdgeWith(PMVertex* v); // is edge this->src a manifold edge?
    00162             void notifyRemoved(void);
    00163
    00164             Vector3  position;  // location of point in euclidean space
    00165             size_t index;       // place of vertex in original list
    00166             typedef std::set<PMVertex *> NeighborList;
    00167             typedef std::set<PMVertex *> DuplicateList;
    00168             NeighborList neighbor; // adjacent vertices
    00169             typedef std::set<PMTriangle *> FaceList;
    00170             FaceList face;     // adjacent triangles
    00171
    00172             Real collapseCost;  // cached cost of collapsing edge
    00173             PMVertex * collapseTo; // candidate vertex for collapse
    00174             bool      removed;   // true if this vert is now removed
    00175             bool      toBeRemoved; // denug
    00176
    00177             bool seam;
    00178
    00179         };
    00180
    00181         typedef std::vector<PMTriangle> TriangleList;
    00182         typedef std::vector<PMFaceVertex> FaceVertexList;
    00183         typedef std::vector<PMVertex> CommonVertexList;
    00184         typedef std::vector<Real> WorstCostList;
    00185
    00187         struct PMWorkingData
    00188         {
    00189             TriangleList mTriList;
    00190             FaceVertexList mFaceVertList; // The vertex details referenced by the triangles
    00191             CommonVertexList mVertList; // The master list of common vertices
    00192         };
    00193
    00194         typedef std::vector<PMWorkingData> WorkingDataList;
    00196         WorkingDataList mWorkingData;
    00197
    00199         WorstCostList mWorstCosts;
    00200
    00202         void addWorkingData(const VertexData* vertexData, const IndexData* indexData);
    00203
    00205         void initialiseEdgeCollapseCosts(void);
    00207         Real computeEdgeCollapseCost(PMVertex *src, PMVertex *dest);
    00209         Real computeEdgeCostAtVertexForBuffer(WorkingDataList::iterator idata, size_t vertIndex);
    00211         void computeEdgeCostAtVertex(size_t vertIndex);
    00213         void computeAllCosts(void);
    00215         size_t getNextCollapser(void);
    00217         void bakeNewLOD(IndexData* pData);
    00218
    00225         void collapse(PMVertex *collapser);
    00226
    00228         void dumpContents(const String& log);
    00229
    00230
    00231
    00232
    00233
    00234
    00235
    00236
    00237
    00238     };
    00239
    00240
    00241
    00242 }
    00243
    00244 #endif

Copyright © 2002-2003 by The OGRE Team
Last modified Sun Nov 28 19:48:40 2004