162 lines
4.6 KiB
C
162 lines
4.6 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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#ifndef PERSISTENT_MANIFOLD_H
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#define PERSISTENT_MANIFOLD_H
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#include "LinearMath/btVector3.h"
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#include "LinearMath/btTransform.h"
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#include "btManifoldPoint.h"
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struct btCollisionResult;
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///contact breaking and merging threshold
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extern btScalar gContactBreakingThreshold;
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typedef bool (*ContactDestroyedCallback)(void* userPersistentData);
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extern ContactDestroyedCallback gContactDestroyedCallback;
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#define MANIFOLD_CACHE_SIZE 4
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///btPersistentManifold maintains contact points, and reduces them to 4.
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///It does contact filtering/contact reduction.
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ATTRIBUTE_ALIGNED16( class) btPersistentManifold
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{
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btManifoldPoint m_pointCache[MANIFOLD_CACHE_SIZE];
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/// this two body pointers can point to the physics rigidbody class.
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/// void* will allow any rigidbody class
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void* m_body0;
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void* m_body1;
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int m_cachedPoints;
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/// sort cached points so most isolated points come first
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int sortCachedPoints(const btManifoldPoint& pt);
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int findContactPoint(const btManifoldPoint* unUsed, int numUnused,const btManifoldPoint& pt);
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public:
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int m_index1;
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btPersistentManifold();
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btPersistentManifold(void* body0,void* body1)
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: m_body0(body0),m_body1(body1),m_cachedPoints(0)
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{
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}
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inline void* getBody0() { return m_body0;}
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inline void* getBody1() { return m_body1;}
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inline const void* getBody0() const { return m_body0;}
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inline const void* getBody1() const { return m_body1;}
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void setBodies(void* body0,void* body1)
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{
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m_body0 = body0;
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m_body1 = body1;
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}
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void clearUserCache(btManifoldPoint& pt);
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#ifdef DEBUG_PERSISTENCY
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void DebugPersistency();
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#endif //
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inline int getNumContacts() const { return m_cachedPoints;}
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inline const btManifoldPoint& getContactPoint(int index) const
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{
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btAssert(index < m_cachedPoints);
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return m_pointCache[index];
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}
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inline btManifoldPoint& getContactPoint(int index)
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{
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btAssert(index < m_cachedPoints);
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return m_pointCache[index];
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}
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/// todo: get this margin from the current physics / collision environment
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btScalar getContactBreakingThreshold() const;
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int getCacheEntry(const btManifoldPoint& newPoint) const;
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void AddManifoldPoint( const btManifoldPoint& newPoint);
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void removeContactPoint (int index)
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{
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clearUserCache(m_pointCache[index]);
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int lastUsedIndex = getNumContacts() - 1;
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// m_pointCache[index] = m_pointCache[lastUsedIndex];
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if(index != lastUsedIndex)
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{
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m_pointCache[index] = m_pointCache[lastUsedIndex];
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//get rid of duplicated userPersistentData pointer
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m_pointCache[lastUsedIndex].m_userPersistentData = 0;
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}
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btAssert(m_pointCache[lastUsedIndex].m_userPersistentData==0);
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m_cachedPoints--;
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}
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void replaceContactPoint(const btManifoldPoint& newPoint,int insertIndex)
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{
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btAssert(validContactDistance(newPoint));
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#define MAINTAIN_PERSISTENCY 1
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#ifdef MAINTAIN_PERSISTENCY
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int lifeTime = m_pointCache[insertIndex].getLifeTime();
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btAssert(lifeTime>=0);
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void* cache = m_pointCache[insertIndex].m_userPersistentData;
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m_pointCache[insertIndex] = newPoint;
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m_pointCache[insertIndex].m_userPersistentData = cache;
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m_pointCache[insertIndex].m_lifeTime = lifeTime;
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#else
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clearUserCache(m_pointCache[insertIndex]);
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m_pointCache[insertIndex] = newPoint;
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#endif
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}
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bool validContactDistance(const btManifoldPoint& pt) const
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{
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return pt.m_distance1 <= getContactBreakingThreshold();
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}
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/// calculated new worldspace coordinates and depth, and reject points that exceed the collision margin
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void refreshContactPoints( const btTransform& trA,const btTransform& trB);
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void clearManifold();
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}
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;
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#endif //PERSISTENT_MANIFOLD_H
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