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btCollisionDispatcher.cpp

/*
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/

This software is provided 'as-is', without any express or implied warranty.
In no event will the authors be held liable for any damages arising from the use of this software.
Permission is granted to anyone to use this software for any purpose, 
including commercial applications, and to alter it and redistribute it freely, 
subject to the following restrictions:

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.
2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/



#include "btCollisionDispatcher.h"


#include "BulletCollision/BroadphaseCollision/btCollisionAlgorithm.h"

#include "BulletCollision/CollisionShapes/btCollisionShape.h"
#include "BulletCollision/CollisionDispatch/btCollisionObject.h"
#include "BulletCollision/BroadphaseCollision/btOverlappingPairCache.h"
#include "LinearMath/btPoolAllocator.h"
#include "BulletCollision/CollisionDispatch/btCollisionConfiguration.h"

int gNumManifold = 0;

#ifdef BT_DEBUG
#include <stdio.h>
#endif


btCollisionDispatcher::btCollisionDispatcher (btCollisionConfiguration* collisionConfiguration): 
      m_count(0),
      m_useIslands(true),
      m_staticWarningReported(false),
      m_collisionConfiguration(collisionConfiguration)
{
      int i;

      setNearCallback(defaultNearCallback);
      
      m_collisionAlgorithmPoolAllocator = collisionConfiguration->getCollisionAlgorithmPool();

      m_persistentManifoldPoolAllocator = collisionConfiguration->getPersistentManifoldPool();

      for (i=0;i<MAX_BROADPHASE_COLLISION_TYPES;i++)
      {
            for (int j=0;j<MAX_BROADPHASE_COLLISION_TYPES;j++)
            {
                  m_doubleDispatch[i][j] = m_collisionConfiguration->getCollisionAlgorithmCreateFunc(i,j);
                  btAssert(m_doubleDispatch[i][j]);
            }
      }
      
      
}


00063 void btCollisionDispatcher::registerCollisionCreateFunc(int proxyType0, int proxyType1, btCollisionAlgorithmCreateFunc *createFunc)
{
      m_doubleDispatch[proxyType0][proxyType1] = createFunc;
}

btCollisionDispatcher::~btCollisionDispatcher()
{
}

btPersistentManifold*   btCollisionDispatcher::getNewManifold(void* b0,void* b1) 
{ 
      gNumManifold++;
      
      //btAssert(gNumManifold < 65535);
      

      btCollisionObject* body0 = (btCollisionObject*)b0;
      btCollisionObject* body1 = (btCollisionObject*)b1;

      //test for Bullet 2.74: use a relative contact breaking threshold without clamping against 'gContactBreakingThreshold'
      //btScalar contactBreakingThreshold = btMin(gContactBreakingThreshold,btMin(body0->getCollisionShape()->getContactBreakingThreshold(),body1->getCollisionShape()->getContactBreakingThreshold()));
      btScalar contactBreakingThreshold = btMin(body0->getCollisionShape()->getContactBreakingThreshold(),body1->getCollisionShape()->getContactBreakingThreshold());

      btScalar contactProcessingThreshold = btMin(body0->getContactProcessingThreshold(),body1->getContactProcessingThreshold());
            
      void* mem = 0;
      
      if (m_persistentManifoldPoolAllocator->getFreeCount())
      {
            mem = m_persistentManifoldPoolAllocator->allocate(sizeof(btPersistentManifold));
      } else
      {
            mem = btAlignedAlloc(sizeof(btPersistentManifold),16);

      }
      btPersistentManifold* manifold = new(mem) btPersistentManifold (body0,body1,0,contactBreakingThreshold,contactProcessingThreshold);
      manifold->m_index1a = m_manifoldsPtr.size();
      m_manifoldsPtr.push_back(manifold);

      return manifold;
}

void btCollisionDispatcher::clearManifold(btPersistentManifold* manifold)
{
      manifold->clearManifold();
}

      
void btCollisionDispatcher::releaseManifold(btPersistentManifold* manifold)
{
      
      gNumManifold--;

      //printf("releaseManifold: gNumManifold %d\n",gNumManifold);
      clearManifold(manifold);

      int findIndex = manifold->m_index1a;
      btAssert(findIndex < m_manifoldsPtr.size());
      m_manifoldsPtr.swap(findIndex,m_manifoldsPtr.size()-1);
      m_manifoldsPtr[findIndex]->m_index1a = findIndex;
      m_manifoldsPtr.pop_back();

      manifold->~btPersistentManifold();
      if (m_persistentManifoldPoolAllocator->validPtr(manifold))
      {
            m_persistentManifoldPoolAllocator->freeMemory(manifold);
      } else
      {
            btAlignedFree(manifold);
      }
      
}

      

btCollisionAlgorithm* btCollisionDispatcher::findAlgorithm(btCollisionObject* body0,btCollisionObject* body1,btPersistentManifold* sharedManifold)
{
      
      btCollisionAlgorithmConstructionInfo ci;

      ci.m_dispatcher1 = this;
      ci.m_manifold = sharedManifold;
      btCollisionAlgorithm* algo = m_doubleDispatch[body0->getCollisionShape()->getShapeType()][body1->getCollisionShape()->getShapeType()]->CreateCollisionAlgorithm(ci,body0,body1);

      return algo;
}




bool  btCollisionDispatcher::needsResponse(btCollisionObject* body0,btCollisionObject* body1)
{
      //here you can do filtering
      bool hasResponse = 
            (body0->hasContactResponse() && body1->hasContactResponse());
      //no response between two static/kinematic bodies:
      hasResponse = hasResponse &&
            ((!body0->isStaticOrKinematicObject()) ||(! body1->isStaticOrKinematicObject()));
      return hasResponse;
}

bool  btCollisionDispatcher::needsCollision(btCollisionObject* body0,btCollisionObject* body1)
{
      btAssert(body0);
      btAssert(body1);

      bool needsCollision = true;

#ifdef BT_DEBUG
      if (!m_staticWarningReported)
      {
            //broadphase filtering already deals with this
            if ((body0->isStaticObject() || body0->isKinematicObject()) &&
                  (body1->isStaticObject() || body1->isKinematicObject()))
            {
                  m_staticWarningReported = true;
                  printf("warning btCollisionDispatcher::needsCollision: static-static collision!\n");
            }
      }
#endif //BT_DEBUG

      if ((!body0->isActive()) && (!body1->isActive()))
            needsCollision = false;
      else if (!body0->checkCollideWith(body1))
            needsCollision = false;
      
      return needsCollision ;

}



///interface for iterating all overlapping collision pairs, no matter how those pairs are stored (array, set, map etc)
///this is useful for the collision dispatcher.
00197 class btCollisionPairCallback : public btOverlapCallback
{
      const btDispatcherInfo& m_dispatchInfo;
      btCollisionDispatcher*  m_dispatcher;

public:

      btCollisionPairCallback(const btDispatcherInfo& dispatchInfo,btCollisionDispatcher* dispatcher)
      :m_dispatchInfo(dispatchInfo),
      m_dispatcher(dispatcher)
      {
      }

      /*btCollisionPairCallback& operator=(btCollisionPairCallback& other)
      {
            m_dispatchInfo = other.m_dispatchInfo;
            m_dispatcher = other.m_dispatcher;
            return *this;
      }
      */


      virtual ~btCollisionPairCallback() {}


      virtual bool      processOverlap(btBroadphasePair& pair)
      {
            (*m_dispatcher->getNearCallback())(pair,*m_dispatcher,m_dispatchInfo);

            return false;
      }
};



void  btCollisionDispatcher::dispatchAllCollisionPairs(btOverlappingPairCache* pairCache,const btDispatcherInfo& dispatchInfo,btDispatcher* dispatcher) 
{
      //m_blockedForChanges = true;

      btCollisionPairCallback collisionCallback(dispatchInfo,this);

      pairCache->processAllOverlappingPairs(&collisionCallback,dispatcher);

      //m_blockedForChanges = false;

}




//by default, Bullet will use this near callback
void btCollisionDispatcher::defaultNearCallback(btBroadphasePair& collisionPair, btCollisionDispatcher& dispatcher, const btDispatcherInfo& dispatchInfo)
{
            btCollisionObject* colObj0 = (btCollisionObject*)collisionPair.m_pProxy0->m_clientObject;
            btCollisionObject* colObj1 = (btCollisionObject*)collisionPair.m_pProxy1->m_clientObject;

            if (dispatcher.needsCollision(colObj0,colObj1))
            {
                  //dispatcher will keep algorithms persistent in the collision pair
                  if (!collisionPair.m_algorithm)
                  {
                        collisionPair.m_algorithm = dispatcher.findAlgorithm(colObj0,colObj1);
                  }

                  if (collisionPair.m_algorithm)
                  {
                        btManifoldResult contactPointResult(colObj0,colObj1);
                        
                        if (dispatchInfo.m_dispatchFunc ==        btDispatcherInfo::DISPATCH_DISCRETE)
                        {
                              //discrete collision detection query
                              collisionPair.m_algorithm->processCollision(colObj0,colObj1,dispatchInfo,&contactPointResult);
                        } else
                        {
                              //continuous collision detection query, time of impact (toi)
                              btScalar toi = collisionPair.m_algorithm->calculateTimeOfImpact(colObj0,colObj1,dispatchInfo,&contactPointResult);
                              if (dispatchInfo.m_timeOfImpact > toi)
                                    dispatchInfo.m_timeOfImpact = toi;

                        }
                  }
            }

}


void* btCollisionDispatcher::allocateCollisionAlgorithm(int size)
{
      if (m_collisionAlgorithmPoolAllocator->getFreeCount())
      {
            return m_collisionAlgorithmPoolAllocator->allocate(size);
      }
      
      //warn user for overflow?
      return      btAlignedAlloc(static_cast<size_t>(size), 16);
}

void btCollisionDispatcher::freeCollisionAlgorithm(void* ptr)
{
      if (m_collisionAlgorithmPoolAllocator->validPtr(ptr))
      {
            m_collisionAlgorithmPoolAllocator->freeMemory(ptr);
      } else
      {
            btAlignedFree(ptr);
      }
}

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