Bullet Collision Detection & Physics Library
btHashedSimplePairCache.h
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1 /*
2 Bullet Continuous Collision Detection and Physics Library
3 Copyright (c) 2003-2006 Erwin Coumans http://continuousphysics.com/Bullet/
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_HASHED_SIMPLE_PAIR_CACHE_H
17 #define BT_HASHED_SIMPLE_PAIR_CACHE_H
18 
19 
20 
22 
23 const int BT_SIMPLE_NULL_PAIR=0xffffffff;
24 
26 {
27  btSimplePair(int indexA,int indexB)
28  :m_indexA(indexA),
29  m_indexB(indexB),
30  m_userPointer(0)
31  {
32  }
33 
34  int m_indexA;
35  int m_indexB;
36  union
37  {
40  };
41 };
42 
44 
45 
46 
47 extern int gOverlappingSimplePairs;
48 extern int gRemoveSimplePairs;
49 extern int gAddedSimplePairs;
50 extern int gFindSimplePairs;
51 
52 
53 
54 
56 {
58 
60 
61 
62 protected:
63 
66 
67 
68 public:
70  virtual ~btHashedSimplePairCache();
71 
72  void removeAllPairs();
73 
74  virtual void* removeOverlappingPair(int indexA,int indexB);
75 
76  // Add a pair and return the new pair. If the pair already exists,
77  // no new pair is created and the old one is returned.
78  virtual btSimplePair* addOverlappingPair(int indexA,int indexB)
79  {
81 
82  return internalAddPair(indexA,indexB);
83  }
84 
85 
87  {
88  return &m_overlappingPairArray[0];
89  }
90 
92  {
93  return &m_overlappingPairArray[0];
94  }
95 
97  {
99  }
100 
102  {
103  return m_overlappingPairArray;
104  }
105 
106 
107  btSimplePair* findPair(int indexA,int indexB);
108 
109  int GetCount() const { return m_overlappingPairArray.size(); }
110 
112  {
113  return m_overlappingPairArray.size();
114  }
115 private:
116 
117  btSimplePair* internalAddPair(int indexA, int indexB);
118 
119  void growTables();
120 
121  SIMD_FORCE_INLINE bool equalsPair(const btSimplePair& pair, int indexA, int indexB)
122  {
123  return pair.m_indexA == indexA && pair.m_indexB == indexB;
124  }
125 
126 
127 
128  SIMD_FORCE_INLINE unsigned int getHash(unsigned int indexA, unsigned int indexB)
129  {
130  int key = static_cast<int>(((unsigned int)indexA) | (((unsigned int)indexB) <<16));
131  // Thomas Wang's hash
132 
133  key += ~(key << 15);
134  key ^= (key >> 10);
135  key += (key << 3);
136  key ^= (key >> 6);
137  key += ~(key << 11);
138  key ^= (key >> 16);
139  return static_cast<unsigned int>(key);
140  }
141 
142 
143 
144 
145 
146  SIMD_FORCE_INLINE btSimplePair* internalFindPair(int proxyIdA , int proxyIdB, int hash)
147  {
148 
149  int index = m_hashTable[hash];
150 
151  while( index != BT_SIMPLE_NULL_PAIR && equalsPair(m_overlappingPairArray[index], proxyIdA, proxyIdB) == false)
152  {
153  index = m_next[index];
154  }
155 
156  if ( index == BT_SIMPLE_NULL_PAIR )
157  {
158  return NULL;
159  }
160 
162 
163  return &m_overlappingPairArray[index];
164  }
165 
166 
167 };
168 
169 
170 
171 
172 #endif //BT_HASHED_SIMPLE_PAIR_CACHE_H
173 
174 
const btSimplePairArray & getOverlappingPairArray() const
virtual btSimplePair * addOverlappingPair(int indexA, int indexB)
unsigned int getHash(unsigned int indexA, unsigned int indexB)
btSimplePair * internalFindPair(int proxyIdA, int proxyIdB, int hash)
int gFindSimplePairs
#define btAssert(x)
Definition: btScalar.h:101
int gOverlappingSimplePairs
#define SIMD_FORCE_INLINE
Definition: btScalar.h:58
btSimplePairArray & getOverlappingPairArray()
virtual btSimplePair * getOverlappingPairArrayPtr()
const btSimplePair * getOverlappingPairArrayPtr() const
int gRemoveSimplePairs
const int BT_SIMPLE_NULL_PAIR
int size() const
return the number of elements in the array
int gAddedSimplePairs
btAlignedObjectArray< int > m_hashTable
btAlignedObjectArray< btSimplePair > btSimplePairArray
bool equalsPair(const btSimplePair &pair, int indexA, int indexB)
btSimplePair * findPair(int indexA, int indexB)
btAlignedObjectArray< int > m_next
virtual void * removeOverlappingPair(int indexA, int indexB)
btSimplePairArray m_overlappingPairArray
btSimplePair * internalAddPair(int indexA, int indexB)
btSimplePair(int indexA, int indexB)