1 /* 2 Bullet Continuous Collision Detection and Physics Library 3 Copyright (c) 2003-2009 Erwin Coumans http://bulletphysics.org 4 5 This software is provided 'as-is', without any express or implied warranty. 6 In no event will the authors be held liable for any damages arising from the use of this software. 7 Permission is granted to anyone to use this software for any purpose, 8 including commercial applications, and to alter it and redistribute it freely, 9 subject to the following restrictions: 10 11 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. 12 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. 13 3. This notice may not be removed or altered from any source distribution. 14 */ 15 16 #ifndef BT_STRIDING_MESHINTERFACE_H 17 #define BT_STRIDING_MESHINTERFACE_H 18 19 #include "LinearMath/btVector3.h" 20 #include "btTriangleCallback.h" 21 #include "btConcaveShape.h" 22 23 24 25 26 27 /// The btStridingMeshInterface is the interface class for high performance generic access to triangle meshes, used in combination with btBvhTriangleMeshShape and some other collision shapes. 28 /// Using index striding of 3*sizeof(integer) it can use triangle arrays, using index striding of 1*sizeof(integer) it can handle triangle strips. 29 /// It allows for sharing graphics and collision meshes. Also it provides locking/unlocking of graphics meshes that are in gpu memory. 30 ATTRIBUTE_ALIGNED16(class ) btStridingMeshInterface 31 { 32 protected: 33 34 btVector3 m_scaling; 35 36 public: 37 BT_DECLARE_ALIGNED_ALLOCATOR(); 38 39 btStridingMeshInterface() :m_scaling(btScalar(1.),btScalar(1.),btScalar(1.)) 40 { 41 42 } 43 44 virtual ~btStridingMeshInterface(); 45 46 47 48 virtual void InternalProcessAllTriangles(btInternalTriangleIndexCallback* callback,const btVector3& aabbMin,const btVector3& aabbMax) const; 49 50 ///brute force method to calculate aabb 51 void calculateAabbBruteForce(btVector3& aabbMin,btVector3& aabbMax); 52 53 /// get read and write access to a subpart of a triangle mesh 54 /// this subpart has a continuous array of vertices and indices 55 /// in this way the mesh can be handled as chunks of memory with striding 56 /// very similar to OpenGL vertexarray support 57 /// make a call to unLockVertexBase when the read and write access is finished 58 virtual void getLockedVertexIndexBase(unsigned char **vertexbase, int& numverts,PHY_ScalarType& type, int& stride,unsigned char **indexbase,int & indexstride,int& numfaces,PHY_ScalarType& indicestype,int subpart=0)=0; 59 60 virtual void getLockedReadOnlyVertexIndexBase(const unsigned char **vertexbase, int& numverts,PHY_ScalarType& type, int& stride,const unsigned char **indexbase,int & indexstride,int& numfaces,PHY_ScalarType& indicestype,int subpart=0) const=0; 61 62 /// unLockVertexBase finishes the access to a subpart of the triangle mesh 63 /// make a call to unLockVertexBase when the read and write access (using getLockedVertexIndexBase) is finished 64 virtual void unLockVertexBase(int subpart)=0; 65 66 virtual void unLockReadOnlyVertexBase(int subpart) const=0; 67 68 69 /// getNumSubParts returns the number of seperate subparts 70 /// each subpart has a continuous array of vertices and indices 71 virtual int getNumSubParts() const=0; 72 73 virtual void preallocateVertices(int numverts)=0; 74 virtual void preallocateIndices(int numindices)=0; 75 76 virtual bool hasPremadeAabb() const { return false; } 77 virtual void setPremadeAabb(const btVector3& aabbMin, const btVector3& aabbMax ) const 78 { 79 (void) aabbMin; 80 (void) aabbMax; 81 } 82 virtual void getPremadeAabb(btVector3* aabbMin, btVector3* aabbMax ) const 83 { 84 (void) aabbMin; 85 (void) aabbMax; 86 } 87 88 const btVector3& getScaling() const { 89 return m_scaling; 90 } 91 void setScaling(const btVector3& scaling) 92 { 93 m_scaling = scaling; 94 } 95 96 virtual int calculateSerializeBufferSize() const; 97 98 ///fills the dataBuffer and returns the struct name (and 0 on failure) 99 virtual const char* serialize(void* dataBuffer, btSerializer* serializer) const; 100 101 102 }; 103 104 struct btIntIndexData 105 { 106 int m_value; 107 }; 108 109 struct btShortIntIndexData 110 { 111 short m_value; 112 char m_pad[2]; 113 }; 114 115 struct btShortIntIndexTripletData 116 { 117 short m_values[3]; 118 char m_pad[2]; 119 }; 120 121 struct btCharIndexTripletData 122 { 123 unsigned char m_values[3]; 124 char m_pad; 125 }; 126 127 128 ///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64 129 struct btMeshPartData 130 { 131 btVector3FloatData *m_vertices3f; 132 btVector3DoubleData *m_vertices3d; 133 134 btIntIndexData *m_indices32; 135 btShortIntIndexTripletData *m_3indices16; 136 btCharIndexTripletData *m_3indices8; 137 138 btShortIntIndexData *m_indices16;//backwards compatibility 139 140 int m_numTriangles;//length of m_indices = m_numTriangles 141 int m_numVertices; 142 }; 143 144 145 ///do not change those serialization structures, it requires an updated sBulletDNAstr/sBulletDNAstr64 146 struct btStridingMeshInterfaceData 147 { 148 btMeshPartData *m_meshPartsPtr; 149 btVector3FloatData m_scaling; 150 int m_numMeshParts; 151 char m_padding[4]; 152 }; 153 154 155 156 157 SIMD_FORCE_INLINE int btStridingMeshInterface::calculateSerializeBufferSize() const 158 { 159 return sizeof(btStridingMeshInterfaceData); 160 } 161 162 163 164 #endif //BT_STRIDING_MESHINTERFACE_H 165
