# 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 (c) 2000-2009 Torus Knot Software Ltd
    00008
    00009 Permission is hereby granted, free of charge, to any person obtaining a copy
    00010 of this software and associated documentation files (the "Software"), to deal
    00011 in the Software without restriction, including without limitation the rights
    00012 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    00013 copies of the Software, and to permit persons to whom the Software is
    00014 furnished to do so, subject to the following conditions:
    00015
    00016 The above copyright notice and this permission notice shall be included in
    00017 all copies or substantial portions of the Software.
    00018
    00019 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    00020 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    00021 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    00022 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    00023 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    00024 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    00025 THE SOFTWARE.
    00026 -----------------------------------------------------------------------------
    00027 */
    00028 // The underlying algorithms in this class are based heavily on:
    00029 /*
    00030  *  Progressive Mesh type Polygon Reduction Algorithm
    00031  *  by Stan Melax (c) 1998
    00032  */
    00033
    00034 #ifndef __ProgressiveMesh_H_
    00035 #define __ProgressiveMesh_H_
    00036
    00037 #include "OgrePrerequisites.h"
    00038 #include "OgreVector3.h"
    00039 #include "OgreHardwareVertexBuffer.h"
    00040 #include "OgreHardwareIndexBuffer.h"
    00041 #include "OgreRenderOperation.h"
    00042
    00043 namespace Ogre {
    00044
    00064     class _OgreExport ProgressiveMesh : public ProgMeshAlloc
    00065     {
    00066     public:
    00067
    00069         enum VertexReductionQuota
    00070         {
    00072             VRQ_CONSTANT,
    00074             VRQ_PROPORTIONAL
    00075         };
    00076
    00077         typedef vector<IndexData*>::type LODFaceList;
    00078
    00086         ProgressiveMesh(const VertexData* vertexData, const IndexData* indexData);
    00087         virtual ~ProgressiveMesh();
    00088
    00104         virtual void addExtraVertexPositionBuffer(const VertexData* vertexData);
    00105
    00114         virtual void build(ushort numLevels, LODFaceList* outList,
    00115             VertexReductionQuota quota = VRQ_PROPORTIONAL, Real reductionValue = 0.5f );
    00116
    00117     protected:
    00118         const VertexData *mpVertexData;
    00119         const IndexData *mpIndexData;
    00120
    00121         size_t mCurrNumIndexes;
    00122         size_t mNumCommonVertices;
    00123
    00124         // Internal classes
    00125         class PMTriangle;
    00126         class PMVertex;
    00127
    00128         public: // VC6 hack
    00129
    00132         class _OgrePrivate PMFaceVertex {
    00133         public:
    00134             size_t realIndex;
    00135             PMVertex* commonVertex;
    00136         };
    00137
    00138         protected:
    00139
    00141         class _OgrePrivate PMTriangle {
    00142         public:
    00143             PMTriangle();
    00144             void setDetails(size_t index, PMFaceVertex *v0, PMFaceVertex *v1, PMFaceVertex *v2);
    00145             void computeNormal(void);
    00146             void replaceVertex(PMFaceVertex *vold, PMFaceVertex *vnew);
    00147             bool hasCommonVertex(PMVertex *v) const;
    00148             bool hasFaceVertex(PMFaceVertex *v) const;
    00149             PMFaceVertex* getFaceVertexFromCommon(PMVertex* commonVert);
    00150             void notifyRemoved(void);
    00151
    00152             PMFaceVertex* vertex[3]; // the 3 points that make this tri
    00153             Vector3   normal;    // unit vector orthogonal to this face
    00154             bool      removed;   // true if this tri is now removed
    00155             size_t index;
    00156         };
    00157
    00164         class _OgrePrivate PMVertex {
    00165         public:
    00166             PMVertex();
    00167             void setDetails(const Vector3& v, size_t index);
    00168             void removeIfNonNeighbor(PMVertex *n);
    00169             bool isBorder(void);
    00170             bool isManifoldEdgeWith(PMVertex* v); // is edge this->src a manifold edge?
    00171             void notifyRemoved(void);
    00172
    00173             Vector3  position;  // location of point in euclidean space
    00174             size_t index;       // place of vertex in original list
    00175             typedef set<PMVertex *>::type NeighborList;
    00176             typedef set<PMVertex *>::type DuplicateList;
    00177             NeighborList neighbor; // adjacent vertices
    00178             typedef set<PMTriangle *>::type FaceList;
    00179             FaceList face;     // adjacent triangles
    00180
    00181             Real collapseCost;  // cached cost of collapsing edge
    00182             PMVertex * collapseTo; // candidate vertex for collapse
    00183             bool      removed;   // true if this vert is now removed
    00184             bool      toBeRemoved; // denug
    00185
    00186             bool seam;
    00187
    00188         };
    00189
    00190         typedef vector<PMTriangle>::type TriangleList;
    00191         typedef vector<PMFaceVertex>::type FaceVertexList;
    00192         typedef vector<PMVertex>::type CommonVertexList;
    00193         typedef vector<Real>::type WorstCostList;
    00194
    00196         struct PMWorkingData
    00197         {
    00198             TriangleList mTriList;
    00199             FaceVertexList mFaceVertList; // The vertex details referenced by the triangles
    00200             CommonVertexList mVertList; // The master list of common vertices
    00201         };
    00202
    00203         typedef vector<PMWorkingData>::type WorkingDataList;
    00205         WorkingDataList mWorkingData;
    00206
    00208         WorstCostList mWorstCosts;
    00209
    00211         void addWorkingData(const VertexData* vertexData, const IndexData* indexData);
    00212
    00214         void initialiseEdgeCollapseCosts(void);
    00216         Real computeEdgeCollapseCost(PMVertex *src, PMVertex *dest);
    00218         Real computeEdgeCostAtVertexForBuffer(WorkingDataList::iterator idata, size_t vertIndex);
    00220         void computeEdgeCostAtVertex(size_t vertIndex);
    00222         void computeAllCosts(void);
    00224         size_t getNextCollapser(void);
    00226         void bakeNewLOD(IndexData* pData);
    00227
    00234         void collapse(PMVertex *collapser);
    00235
    00237         void dumpContents(const String& log);
    00238
    00239
    00240
    00241
    00242
    00243
    00244
    00245
    00246
    00247     };
    00248
    00249
    00253 }
    00254
    00255 #endif

Copyright © 2008 Torus Knot Software Ltd
This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.
Last modified Wed Nov 3 2010 19:24:52