126 lines
4.9 KiB
C++
126 lines
4.9 KiB
C++
/*
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Bullet Continuous Collision Detection and Physics Library
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Copyright (c) 2003-2006 Erwin Coumans http://continuousphysics.com/Bullet/
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This software is provided 'as-is', without any express or implied warranty.
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In no event will the authors be held liable for any damages arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it freely,
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subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "btStridingMeshInterface.h"
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btStridingMeshInterface::~btStridingMeshInterface()
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{
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}
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void btStridingMeshInterface::InternalProcessAllTriangles(btInternalTriangleIndexCallback* callback,const btVector3& aabbMin,const btVector3& aabbMax) const
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{
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(void)aabbMin;
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(void)aabbMax;
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int numtotalphysicsverts = 0;
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int part,graphicssubparts = getNumSubParts();
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const unsigned char * vertexbase;
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const unsigned char * indexbase;
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int indexstride;
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PHY_ScalarType type;
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PHY_ScalarType gfxindextype;
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int stride,numverts,numtriangles;
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int gfxindex;
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btVector3 triangle[3];
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btScalar* graphicsbase;
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btVector3 meshScaling = getScaling();
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///if the number of parts is big, the performance might drop due to the innerloop switch on indextype
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for (part=0;part<graphicssubparts ;part++)
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{
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getLockedReadOnlyVertexIndexBase(&vertexbase,numverts,type,stride,&indexbase,indexstride,numtriangles,gfxindextype,part);
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numtotalphysicsverts+=numtriangles*3; //upper bound
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switch (gfxindextype)
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{
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case PHY_INTEGER:
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{
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for (gfxindex=0;gfxindex<numtriangles;gfxindex++)
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{
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int* tri_indices= (int*)(indexbase+gfxindex*indexstride);
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graphicsbase = (btScalar*)(vertexbase+tri_indices[0]*stride);
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triangle[0].setValue(graphicsbase[0]*meshScaling.getX(),graphicsbase[1]*meshScaling.getY(),graphicsbase[2]*meshScaling.getZ());
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graphicsbase = (btScalar*)(vertexbase+tri_indices[1]*stride);
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triangle[1].setValue(graphicsbase[0]*meshScaling.getX(),graphicsbase[1]*meshScaling.getY(), graphicsbase[2]*meshScaling.getZ());
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graphicsbase = (btScalar*)(vertexbase+tri_indices[2]*stride);
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triangle[2].setValue(graphicsbase[0]*meshScaling.getX(),graphicsbase[1]*meshScaling.getY(), graphicsbase[2]*meshScaling.getZ());
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callback->internalProcessTriangleIndex(triangle,part,gfxindex);
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}
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break;
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}
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case PHY_SHORT:
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{
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for (gfxindex=0;gfxindex<numtriangles;gfxindex++)
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{
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short int* tri_indices= (short int*)(indexbase+gfxindex*indexstride);
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graphicsbase = (btScalar*)(vertexbase+tri_indices[0]*stride);
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triangle[0].setValue(graphicsbase[0]*meshScaling.getX(),graphicsbase[1]*meshScaling.getY(),graphicsbase[2]*meshScaling.getZ());
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graphicsbase = (btScalar*)(vertexbase+tri_indices[1]*stride);
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triangle[1].setValue(graphicsbase[0]*meshScaling.getX(),graphicsbase[1]*meshScaling.getY(), graphicsbase[2]*meshScaling.getZ());
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graphicsbase = (btScalar*)(vertexbase+tri_indices[2]*stride);
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triangle[2].setValue(graphicsbase[0]*meshScaling.getX(),graphicsbase[1]*meshScaling.getY(), graphicsbase[2]*meshScaling.getZ());
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callback->internalProcessTriangleIndex(triangle,part,gfxindex);
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}
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break;
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}
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default:
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btAssert((gfxindextype == PHY_INTEGER) || (gfxindextype == PHY_SHORT));
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}
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unLockReadOnlyVertexBase(part);
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}
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}
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void btStridingMeshInterface::calculateAabbBruteForce(btVector3& aabbMin,btVector3& aabbMax)
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{
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struct AabbCalculationCallback : public btInternalTriangleIndexCallback
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{
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btVector3 m_aabbMin;
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btVector3 m_aabbMax;
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AabbCalculationCallback()
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{
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m_aabbMin.setValue(btScalar(1e30),btScalar(1e30),btScalar(1e30));
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m_aabbMax.setValue(btScalar(-1e30),btScalar(-1e30),btScalar(-1e30));
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}
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virtual void internalProcessTriangleIndex(btVector3* triangle,int partId,int triangleIndex)
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{
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(void)partId;
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(void)triangleIndex;
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m_aabbMin.setMin(triangle[0]);
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m_aabbMax.setMax(triangle[0]);
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m_aabbMin.setMin(triangle[1]);
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m_aabbMax.setMax(triangle[1]);
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m_aabbMin.setMin(triangle[2]);
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m_aabbMax.setMax(triangle[2]);
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}
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};
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//first calculate the total aabb for all triangles
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AabbCalculationCallback aabbCallback;
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aabbMin.setValue(btScalar(-1e30),btScalar(-1e30),btScalar(-1e30));
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aabbMax.setValue(btScalar(1e30),btScalar(1e30),btScalar(1e30));
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InternalProcessAllTriangles(&aabbCallback,aabbMin,aabbMax);
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aabbMin = aabbCallback.m_aabbMin;
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aabbMax = aabbCallback.m_aabbMax;
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}
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