| 1 | /* | 
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| 2 | Bullet Continuous Collision Detection and Physics Library | 
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| 3 | Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/ | 
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| 4 |  | 
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| 5 | This software is provided 'as-is', without any express or implied warranty. | 
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| 6 | In no event will the authors be held liable for any damages arising from the use of this software. | 
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| 7 | Permission is granted to anyone to use this software for any purpose, | 
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| 8 | including commercial applications, and to alter it and redistribute it freely, | 
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| 9 | subject to the following restrictions: | 
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| 10 |  | 
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| 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. | 
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| 12 | 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. | 
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| 13 | 3. This notice may not be removed or altered from any source distribution. | 
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| 14 | */ | 
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| 15 |  | 
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| 16 | #include "btOptimizedBvh.h" | 
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| 17 | #include "btStridingMeshInterface.h" | 
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| 18 | #include "LinearMath/btAabbUtil2.h" | 
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| 19 | #include "LinearMath/btIDebugDraw.h" | 
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| 20 |  | 
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| 21 |  | 
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| 22 | btOptimizedBvh::btOptimizedBvh() | 
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| 23 | { | 
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| 24 | } | 
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| 25 |  | 
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| 26 | btOptimizedBvh::~btOptimizedBvh() | 
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| 27 | { | 
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| 28 | } | 
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| 29 |  | 
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| 30 |  | 
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| 31 | void btOptimizedBvh::build(btStridingMeshInterface* triangles, bool useQuantizedAabbCompression, const btVector3& bvhAabbMin, const btVector3& bvhAabbMax) | 
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| 32 | { | 
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| 33 | m_useQuantization = useQuantizedAabbCompression; | 
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| 34 |  | 
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| 35 |  | 
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| 36 | // NodeArray    triangleNodes; | 
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| 37 |  | 
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| 38 | struct  NodeTriangleCallback : public btInternalTriangleIndexCallback | 
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| 39 | { | 
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| 40 |  | 
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| 41 | NodeArray&      m_triangleNodes; | 
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| 42 |  | 
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| 43 | NodeTriangleCallback& operator=(NodeTriangleCallback& other) | 
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| 44 | { | 
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| 45 | m_triangleNodes = other.m_triangleNodes; | 
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| 46 | return *this; | 
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| 47 | } | 
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| 48 |  | 
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| 49 | NodeTriangleCallback(NodeArray& triangleNodes) | 
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| 50 | :m_triangleNodes(triangleNodes) | 
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| 51 | { | 
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| 52 | } | 
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| 53 |  | 
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| 54 | virtual void internalProcessTriangleIndex(btVector3* triangle,int partId,int  triangleIndex) | 
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| 55 | { | 
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| 56 | btOptimizedBvhNode node; | 
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| 57 | btVector3       aabbMin,aabbMax; | 
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| 58 | aabbMin.setValue(btScalar(1e30),btScalar(1e30),btScalar(1e30)); | 
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| 59 | aabbMax.setValue(btScalar(-1e30),btScalar(-1e30),btScalar(-1e30)); | 
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| 60 | aabbMin.setMin(triangle[0]); | 
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| 61 | aabbMax.setMax(triangle[0]); | 
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| 62 | aabbMin.setMin(triangle[1]); | 
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| 63 | aabbMax.setMax(triangle[1]); | 
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| 64 | aabbMin.setMin(triangle[2]); | 
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| 65 | aabbMax.setMax(triangle[2]); | 
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| 66 |  | 
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| 67 | //with quantization? | 
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| 68 | node.m_aabbMinOrg = aabbMin; | 
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| 69 | node.m_aabbMaxOrg = aabbMax; | 
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| 70 |  | 
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| 71 | node.m_escapeIndex = -1; | 
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| 72 |  | 
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| 73 | //for child nodes | 
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| 74 | node.m_subPart = partId; | 
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| 75 | node.m_triangleIndex = triangleIndex; | 
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| 76 | m_triangleNodes.push_back(node); | 
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| 77 | } | 
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| 78 | }; | 
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| 79 | struct  QuantizedNodeTriangleCallback : public btInternalTriangleIndexCallback | 
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| 80 | { | 
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| 81 | QuantizedNodeArray&     m_triangleNodes; | 
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| 82 | const btQuantizedBvh* m_optimizedTree; // for quantization | 
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| 83 |  | 
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| 84 | QuantizedNodeTriangleCallback& operator=(QuantizedNodeTriangleCallback& other) | 
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| 85 | { | 
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| 86 | m_triangleNodes = other.m_triangleNodes; | 
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| 87 | m_optimizedTree = other.m_optimizedTree; | 
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| 88 | return *this; | 
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| 89 | } | 
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| 90 |  | 
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| 91 | QuantizedNodeTriangleCallback(QuantizedNodeArray&       triangleNodes,const btQuantizedBvh* tree) | 
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| 92 | :m_triangleNodes(triangleNodes),m_optimizedTree(tree) | 
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| 93 | { | 
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| 94 | } | 
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| 95 |  | 
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| 96 | virtual void internalProcessTriangleIndex(btVector3* triangle,int partId,int  triangleIndex) | 
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| 97 | { | 
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| 98 | // The partId and triangle index must fit in the same (positive) integer | 
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| 99 | btAssert(partId < (1<<MAX_NUM_PARTS_IN_BITS)); | 
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| 100 | btAssert(triangleIndex < (1<<(31-MAX_NUM_PARTS_IN_BITS))); | 
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| 101 | //negative indices are reserved for escapeIndex | 
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| 102 | btAssert(triangleIndex>=0); | 
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| 103 |  | 
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| 104 | btQuantizedBvhNode node; | 
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| 105 | btVector3       aabbMin,aabbMax; | 
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| 106 | aabbMin.setValue(btScalar(1e30),btScalar(1e30),btScalar(1e30)); | 
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| 107 | aabbMax.setValue(btScalar(-1e30),btScalar(-1e30),btScalar(-1e30)); | 
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| 108 | aabbMin.setMin(triangle[0]); | 
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| 109 | aabbMax.setMax(triangle[0]); | 
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| 110 | aabbMin.setMin(triangle[1]); | 
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| 111 | aabbMax.setMax(triangle[1]); | 
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| 112 | aabbMin.setMin(triangle[2]); | 
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| 113 | aabbMax.setMax(triangle[2]); | 
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| 114 |  | 
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| 115 | //PCK: add these checks for zero dimensions of aabb | 
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| 116 | const btScalar MIN_AABB_DIMENSION = btScalar(0.002); | 
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| 117 | const btScalar MIN_AABB_HALF_DIMENSION = btScalar(0.001); | 
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| 118 | if (aabbMax.x() - aabbMin.x() < MIN_AABB_DIMENSION) | 
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| 119 | { | 
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| 120 | aabbMax.setX(aabbMax.x() + MIN_AABB_HALF_DIMENSION); | 
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| 121 | aabbMin.setX(aabbMin.x() - MIN_AABB_HALF_DIMENSION); | 
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| 122 | } | 
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| 123 | if (aabbMax.y() - aabbMin.y() < MIN_AABB_DIMENSION) | 
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| 124 | { | 
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| 125 | aabbMax.setY(aabbMax.y() + MIN_AABB_HALF_DIMENSION); | 
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| 126 | aabbMin.setY(aabbMin.y() - MIN_AABB_HALF_DIMENSION); | 
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| 127 | } | 
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| 128 | if (aabbMax.z() - aabbMin.z() < MIN_AABB_DIMENSION) | 
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| 129 | { | 
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| 130 | aabbMax.setZ(aabbMax.z() + MIN_AABB_HALF_DIMENSION); | 
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| 131 | aabbMin.setZ(aabbMin.z() - MIN_AABB_HALF_DIMENSION); | 
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| 132 | } | 
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| 133 |  | 
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| 134 | m_optimizedTree->quantize(&node.m_quantizedAabbMin[0],aabbMin,0); | 
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| 135 | m_optimizedTree->quantize(&node.m_quantizedAabbMax[0],aabbMax,1); | 
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| 136 |  | 
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| 137 | node.m_escapeIndexOrTriangleIndex = (partId<<(31-MAX_NUM_PARTS_IN_BITS)) | triangleIndex; | 
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| 138 |  | 
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| 139 | m_triangleNodes.push_back(node); | 
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| 140 | } | 
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| 141 | }; | 
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| 142 |  | 
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| 143 |  | 
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| 144 |  | 
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| 145 | int numLeafNodes = 0; | 
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| 146 |  | 
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| 147 |  | 
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| 148 | if (m_useQuantization) | 
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| 149 | { | 
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| 150 |  | 
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| 151 | //initialize quantization values | 
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| 152 | setQuantizationValues(bvhAabbMin,bvhAabbMax); | 
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| 153 |  | 
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| 154 | QuantizedNodeTriangleCallback   callback(m_quantizedLeafNodes,this); | 
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| 155 |  | 
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| 156 |  | 
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| 157 | triangles->InternalProcessAllTriangles(&callback,m_bvhAabbMin,m_bvhAabbMax); | 
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| 158 |  | 
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| 159 | //now we have an array of leafnodes in m_leafNodes | 
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| 160 | numLeafNodes = m_quantizedLeafNodes.size(); | 
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| 161 |  | 
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| 162 |  | 
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| 163 | m_quantizedContiguousNodes.resize(2*numLeafNodes); | 
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| 164 |  | 
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| 165 |  | 
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| 166 | } else | 
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| 167 | { | 
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| 168 | NodeTriangleCallback    callback(m_leafNodes); | 
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| 169 |  | 
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| 170 | btVector3 aabbMin(btScalar(-1e30),btScalar(-1e30),btScalar(-1e30)); | 
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| 171 | btVector3 aabbMax(btScalar(1e30),btScalar(1e30),btScalar(1e30)); | 
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| 172 |  | 
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| 173 | triangles->InternalProcessAllTriangles(&callback,aabbMin,aabbMax); | 
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| 174 |  | 
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| 175 | //now we have an array of leafnodes in m_leafNodes | 
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| 176 | numLeafNodes = m_leafNodes.size(); | 
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| 177 |  | 
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| 178 | m_contiguousNodes.resize(2*numLeafNodes); | 
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| 179 | } | 
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| 180 |  | 
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| 181 | m_curNodeIndex = 0; | 
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| 182 |  | 
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| 183 | buildTree(0,numLeafNodes); | 
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| 184 |  | 
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| 185 | ///if the entire tree is small then subtree size, we need to create a header info for the tree | 
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| 186 | if(m_useQuantization && !m_SubtreeHeaders.size()) | 
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| 187 | { | 
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| 188 | btBvhSubtreeInfo& subtree = m_SubtreeHeaders.expand(); | 
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| 189 | subtree.setAabbFromQuantizeNode(m_quantizedContiguousNodes[0]); | 
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| 190 | subtree.m_rootNodeIndex = 0; | 
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| 191 | subtree.m_subtreeSize = m_quantizedContiguousNodes[0].isLeafNode() ? 1 : m_quantizedContiguousNodes[0].getEscapeIndex(); | 
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| 192 | } | 
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| 193 |  | 
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| 194 | //PCK: update the copy of the size | 
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| 195 | m_subtreeHeaderCount = m_SubtreeHeaders.size(); | 
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| 196 |  | 
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| 197 | //PCK: clear m_quantizedLeafNodes and m_leafNodes, they are temporary | 
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| 198 | m_quantizedLeafNodes.clear(); | 
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| 199 | m_leafNodes.clear(); | 
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| 200 | } | 
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| 201 |  | 
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| 202 |  | 
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| 203 |  | 
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| 204 |  | 
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| 205 | void    btOptimizedBvh::refit(btStridingMeshInterface* meshInterface,const btVector3& aabbMin,const btVector3& aabbMax) | 
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| 206 | { | 
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| 207 | if (m_useQuantization) | 
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| 208 | { | 
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| 209 |  | 
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| 210 | setQuantizationValues(aabbMin,aabbMax); | 
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| 211 |  | 
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| 212 | updateBvhNodes(meshInterface,0,m_curNodeIndex,0); | 
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| 213 |  | 
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| 214 | ///now update all subtree headers | 
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| 215 |  | 
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| 216 | int i; | 
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| 217 | for (i=0;i<m_SubtreeHeaders.size();i++) | 
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| 218 | { | 
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| 219 | btBvhSubtreeInfo& subtree = m_SubtreeHeaders[i]; | 
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| 220 | subtree.setAabbFromQuantizeNode(m_quantizedContiguousNodes[subtree.m_rootNodeIndex]); | 
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| 221 | } | 
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| 222 |  | 
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| 223 | } else | 
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| 224 | { | 
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| 225 |  | 
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| 226 | } | 
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| 227 | } | 
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| 228 |  | 
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| 229 |  | 
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| 230 |  | 
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| 231 |  | 
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| 232 | void    btOptimizedBvh::refitPartial(btStridingMeshInterface* meshInterface,const btVector3& aabbMin,const btVector3& aabbMax) | 
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| 233 | { | 
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| 234 | //incrementally initialize quantization values | 
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| 235 | btAssert(m_useQuantization); | 
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| 236 |  | 
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| 237 | btAssert(aabbMin.getX() > m_bvhAabbMin.getX()); | 
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| 238 | btAssert(aabbMin.getY() > m_bvhAabbMin.getY()); | 
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| 239 | btAssert(aabbMin.getZ() > m_bvhAabbMin.getZ()); | 
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| 240 |  | 
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| 241 | btAssert(aabbMax.getX() < m_bvhAabbMax.getX()); | 
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| 242 | btAssert(aabbMax.getY() < m_bvhAabbMax.getY()); | 
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| 243 | btAssert(aabbMax.getZ() < m_bvhAabbMax.getZ()); | 
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| 244 |  | 
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| 245 | ///we should update all quantization values, using updateBvhNodes(meshInterface); | 
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| 246 | ///but we only update chunks that overlap the given aabb | 
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| 247 |  | 
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| 248 | unsigned short  quantizedQueryAabbMin[3]; | 
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| 249 | unsigned short  quantizedQueryAabbMax[3]; | 
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| 250 |  | 
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| 251 | quantize(&quantizedQueryAabbMin[0],aabbMin,0); | 
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| 252 | quantize(&quantizedQueryAabbMax[0],aabbMax,1); | 
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| 253 |  | 
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| 254 | int i; | 
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| 255 | for (i=0;i<this->m_SubtreeHeaders.size();i++) | 
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| 256 | { | 
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| 257 | btBvhSubtreeInfo& subtree = m_SubtreeHeaders[i]; | 
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| 258 |  | 
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| 259 | //PCK: unsigned instead of bool | 
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| 260 | unsigned overlap = testQuantizedAabbAgainstQuantizedAabb(quantizedQueryAabbMin,quantizedQueryAabbMax,subtree.m_quantizedAabbMin,subtree.m_quantizedAabbMax); | 
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| 261 | if (overlap != 0) | 
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| 262 | { | 
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| 263 | updateBvhNodes(meshInterface,subtree.m_rootNodeIndex,subtree.m_rootNodeIndex+subtree.m_subtreeSize,i); | 
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| 264 |  | 
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| 265 | subtree.setAabbFromQuantizeNode(m_quantizedContiguousNodes[subtree.m_rootNodeIndex]); | 
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| 266 | } | 
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| 267 | } | 
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| 268 |  | 
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| 269 | } | 
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| 270 |  | 
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| 271 | void    btOptimizedBvh::updateBvhNodes(btStridingMeshInterface* meshInterface,int firstNode,int endNode,int index) | 
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| 272 | { | 
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| 273 | (void)index; | 
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| 274 |  | 
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| 275 | btAssert(m_useQuantization); | 
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| 276 |  | 
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| 277 | int curNodeSubPart=-1; | 
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| 278 |  | 
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| 279 | //get access info to trianglemesh data | 
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| 280 | const unsigned char *vertexbase = 0; | 
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| 281 | int numverts = 0; | 
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| 282 | PHY_ScalarType type = PHY_INTEGER; | 
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| 283 | int stride = 0; | 
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| 284 | const unsigned char *indexbase = 0; | 
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| 285 | int indexstride = 0; | 
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| 286 | int numfaces = 0; | 
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| 287 | PHY_ScalarType indicestype = PHY_INTEGER; | 
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| 288 |  | 
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| 289 | btVector3       triangleVerts[3]; | 
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| 290 | btVector3       aabbMin,aabbMax; | 
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| 291 | const btVector3& meshScaling = meshInterface->getScaling(); | 
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| 292 |  | 
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| 293 | int i; | 
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| 294 | for (i=endNode-1;i>=firstNode;i--) | 
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| 295 | { | 
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| 296 |  | 
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| 297 |  | 
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| 298 | btQuantizedBvhNode& curNode = m_quantizedContiguousNodes[i]; | 
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| 299 | if (curNode.isLeafNode()) | 
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| 300 | { | 
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| 301 | //recalc aabb from triangle data | 
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| 302 | int nodeSubPart = curNode.getPartId(); | 
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| 303 | int nodeTriangleIndex = curNode.getTriangleIndex(); | 
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| 304 | if (nodeSubPart != curNodeSubPart) | 
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| 305 | { | 
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| 306 | if (curNodeSubPart >= 0) | 
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| 307 | meshInterface->unLockReadOnlyVertexBase(curNodeSubPart); | 
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| 308 | meshInterface->getLockedReadOnlyVertexIndexBase(&vertexbase,numverts,   type,stride,&indexbase,indexstride,numfaces,indicestype,nodeSubPart); | 
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| 309 |  | 
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| 310 | curNodeSubPart = nodeSubPart; | 
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| 311 | btAssert(indicestype==PHY_INTEGER||indicestype==PHY_SHORT); | 
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| 312 | } | 
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| 313 | //triangles->getLockedReadOnlyVertexIndexBase(vertexBase,numVerts, | 
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| 314 |  | 
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| 315 | unsigned int* gfxbase = (unsigned int*)(indexbase+nodeTriangleIndex*indexstride); | 
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| 316 |  | 
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| 317 |  | 
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| 318 | for (int j=2;j>=0;j--) | 
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| 319 | { | 
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| 320 |  | 
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| 321 | int graphicsindex = indicestype==PHY_SHORT?((unsigned short*)gfxbase)[j]:gfxbase[j]; | 
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| 322 | if (type == PHY_FLOAT) | 
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| 323 | { | 
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| 324 | float* graphicsbase = (float*)(vertexbase+graphicsindex*stride); | 
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| 325 | triangleVerts[j] = btVector3( | 
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| 326 | graphicsbase[0]*meshScaling.getX(), | 
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| 327 | graphicsbase[1]*meshScaling.getY(), | 
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| 328 | graphicsbase[2]*meshScaling.getZ()); | 
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| 329 | } | 
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| 330 | else | 
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| 331 | { | 
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| 332 | double* graphicsbase = (double*)(vertexbase+graphicsindex*stride); | 
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| 333 | triangleVerts[j] = btVector3( btScalar(graphicsbase[0]*meshScaling.getX()), btScalar(graphicsbase[1]*meshScaling.getY()), btScalar(graphicsbase[2]*meshScaling.getZ())); | 
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| 334 | } | 
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| 335 | } | 
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| 336 |  | 
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| 337 |  | 
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| 338 |  | 
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| 339 | aabbMin.setValue(btScalar(1e30),btScalar(1e30),btScalar(1e30)); | 
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| 340 | aabbMax.setValue(btScalar(-1e30),btScalar(-1e30),btScalar(-1e30)); | 
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| 341 | aabbMin.setMin(triangleVerts[0]); | 
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| 342 | aabbMax.setMax(triangleVerts[0]); | 
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| 343 | aabbMin.setMin(triangleVerts[1]); | 
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| 344 | aabbMax.setMax(triangleVerts[1]); | 
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| 345 | aabbMin.setMin(triangleVerts[2]); | 
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| 346 | aabbMax.setMax(triangleVerts[2]); | 
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| 347 |  | 
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| 348 | quantize(&curNode.m_quantizedAabbMin[0],aabbMin,0); | 
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| 349 | quantize(&curNode.m_quantizedAabbMax[0],aabbMax,1); | 
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| 350 |  | 
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| 351 | } else | 
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| 352 | { | 
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| 353 | //combine aabb from both children | 
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| 354 |  | 
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| 355 | btQuantizedBvhNode* leftChildNode = &m_quantizedContiguousNodes[i+1]; | 
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| 356 |  | 
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| 357 | btQuantizedBvhNode* rightChildNode = leftChildNode->isLeafNode() ? &m_quantizedContiguousNodes[i+2] : | 
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| 358 | &m_quantizedContiguousNodes[i+1+leftChildNode->getEscapeIndex()]; | 
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| 359 |  | 
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| 360 |  | 
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| 361 | { | 
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| 362 | for (int i=0;i<3;i++) | 
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| 363 | { | 
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| 364 | curNode.m_quantizedAabbMin[i] = leftChildNode->m_quantizedAabbMin[i]; | 
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| 365 | if (curNode.m_quantizedAabbMin[i]>rightChildNode->m_quantizedAabbMin[i]) | 
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| 366 | curNode.m_quantizedAabbMin[i]=rightChildNode->m_quantizedAabbMin[i]; | 
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| 367 |  | 
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| 368 | curNode.m_quantizedAabbMax[i] = leftChildNode->m_quantizedAabbMax[i]; | 
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| 369 | if (curNode.m_quantizedAabbMax[i] < rightChildNode->m_quantizedAabbMax[i]) | 
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| 370 | curNode.m_quantizedAabbMax[i] = rightChildNode->m_quantizedAabbMax[i]; | 
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| 371 | } | 
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| 372 | } | 
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| 373 | } | 
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| 374 |  | 
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| 375 | } | 
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| 376 |  | 
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| 377 | if (curNodeSubPart >= 0) | 
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| 378 | meshInterface->unLockReadOnlyVertexBase(curNodeSubPart); | 
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| 379 |  | 
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| 380 |  | 
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| 381 | } | 
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| 382 |  | 
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| 383 | ///deSerializeInPlace loads and initializes a BVH from a buffer in memory 'in place' | 
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| 384 | btOptimizedBvh* btOptimizedBvh::deSerializeInPlace(void *i_alignedDataBuffer, unsigned int i_dataBufferSize, bool i_swapEndian) | 
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| 385 | { | 
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| 386 | btQuantizedBvh* bvh = btQuantizedBvh::deSerializeInPlace(i_alignedDataBuffer,i_dataBufferSize,i_swapEndian); | 
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| 387 |  | 
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| 388 | //we don't add additional data so just do a static upcast | 
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| 389 | return static_cast<btOptimizedBvh*>(bvh); | 
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| 390 | } | 
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