confusion about memory management, and removed obsolete PhysicsInterface code.todo: updated the demos that still use this code

src/BulletDynamics/Dynamics/btDiscreteDynamicsWorld.cpp

@@ -36,10 +36,13 @@ subject to the following restrictions:
 #include <algorithm>
 
 btDiscreteDynamicsWorld::btDiscreteDynamicsWorld()
-:btDynamicsWorld(new	btCollisionDispatcher(),new btSimpleBroadphase()),
+:btDynamicsWorld(),
 m_constraintSolver(new btSequentialImpulseConstraintSolver)
 {
 	m_islandManager = new btSimulationIslandManager();
+	m_ownsIslandManager = true;
+	m_ownsConstraintSolver = true;
+
 }
 
 btDiscreteDynamicsWorld::btDiscreteDynamicsWorld(btDispatcher* dispatcher,btOverlappingPairCache* pairCache,btConstraintSolver* constraintSolver)
@@ -47,20 +50,18 @@ btDiscreteDynamicsWorld::btDiscreteDynamicsWorld(btDispatcher* dispatcher,btOver
 m_constraintSolver(constraintSolver)
 {
 	m_islandManager = new btSimulationIslandManager();
+	m_ownsIslandManager = true;
+	m_ownsConstraintSolver = false;
 }
 
 
 btDiscreteDynamicsWorld::~btDiscreteDynamicsWorld()
 {
-	delete m_islandManager ;
-
-	delete m_constraintSolver;
-
-	//delete the dispatcher and paircache
-	delete m_dispatcher1;
-	m_dispatcher1 = 0;
-	delete m_pairCache;
-	m_pairCache = 0;
+	//only delete it when we created it
+	if (m_ownsIslandManager)
+		delete m_islandManager;
+	if (m_ownsConstraintSolver)
+		 delete m_constraintSolver;
 }
 
 void	btDiscreteDynamicsWorld::stepSimulation(float timeStep)
@@ -291,7 +292,7 @@ void	btDiscreteDynamicsWorld::updateAabbs()
 			{
 				btPoint3 minAabb,maxAabb;
 				colObj->m_collisionShape->getAabb(colObj->m_worldTransform, minAabb,maxAabb);
-				btSimpleBroadphase* bp = (btSimpleBroadphase*)m_pairCache;
+				btSimpleBroadphase* bp = (btSimpleBroadphase*)m_broadphasePairCache;
 				bp->setAabb(body->m_broadphaseHandle,minAabb,maxAabb);
 			}
 		}

src/BulletDynamics/Dynamics/btDiscreteDynamicsWorld.h

@@ -40,6 +40,9 @@ protected:
 
 	std::vector<btTypedConstraint*> m_constraints;
 
+	bool	m_ownsIslandManager;
+	bool	m_ownsConstraintSolver;
+
 	std::vector<btRaycastVehicle*>	m_vehicles;
 
 	void	predictUnconstraintMotion(float timeStep);
@@ -61,8 +64,10 @@ protected:
 public:
 
 
+	///this btDiscreteDynamicsWorld constructor gets created objects from the user, and will not delete those
 	btDiscreteDynamicsWorld(btDispatcher* dispatcher,btOverlappingPairCache* pairCache,btConstraintSolver* constraintSolver);
 
+	///this btDiscreteDynamicsWorld will create and own dispatcher, pairCache and constraintSolver, and deletes it in the destructor.
 	btDiscreteDynamicsWorld();
 		
 	virtual ~btDiscreteDynamicsWorld();

src/BulletDynamics/Dynamics/btDynamicsWorld.h

@@ -24,11 +24,15 @@ class btDynamicsWorld : public btCollisionWorld
 {
 	public:
 		
+		btDynamicsWorld()
+		{
+		}
+
 		btDynamicsWorld(btDispatcher* dispatcher,btOverlappingPairCache* pairCache)
 		:btCollisionWorld(dispatcher,pairCache)
 		{
-
 		}
+
 		virtual ~btDynamicsWorld()
 		{
 		}

src/BulletDynamics/Dynamics/btSimpleDynamicsWorld.cpp

@@ -23,15 +23,15 @@ subject to the following restrictions:
 
 
 btSimpleDynamicsWorld::btSimpleDynamicsWorld()
-:btDynamicsWorld(new	btCollisionDispatcher(),new btSimpleBroadphase()),
-m_constraintSolver(new btSequentialImpulseConstraintSolver)
+:m_constraintSolver(new btSequentialImpulseConstraintSolver),
+m_ownsConstraintSolver(true)
 {
-
 }
 
 btSimpleDynamicsWorld::btSimpleDynamicsWorld(btDispatcher* dispatcher,btOverlappingPairCache* pairCache,btConstraintSolver* constraintSolver)
 :btDynamicsWorld(dispatcher,pairCache),
-m_constraintSolver(constraintSolver)
+m_constraintSolver(constraintSolver),
+m_ownsConstraintSolver(false)
 {
 
 }
@@ -39,13 +39,8 @@ m_constraintSolver(constraintSolver)
 
 btSimpleDynamicsWorld::~btSimpleDynamicsWorld()
 {
-	delete m_constraintSolver;
-
-	//delete the dispatcher and paircache
-	delete m_dispatcher1;
-	m_dispatcher1 = 0;
-	delete m_pairCache;
-	m_pairCache = 0;
+	if (m_ownsConstraintSolver)
+		delete m_constraintSolver;
 }
 
 void	btSimpleDynamicsWorld::stepSimulation(float timeStep)
@@ -86,7 +81,7 @@ void	btSimpleDynamicsWorld::updateAabbs()
 			{
 				btPoint3 minAabb,maxAabb;
 				colObj->m_collisionShape->getAabb(colObj->m_worldTransform, minAabb,maxAabb);
-				btSimpleBroadphase* bp = (btSimpleBroadphase*)m_pairCache;
+				btBroadphaseInterface* bp = getBroadphase();
 				bp->setAabb(body->m_broadphaseHandle,minAabb,maxAabb);
 			}
 		}

src/BulletDynamics/Dynamics/btSimpleDynamicsWorld.h

@@ -33,6 +33,8 @@ protected:
 
 	btConstraintSolver*	m_constraintSolver;
 
+	bool	m_ownsConstraintSolver;
+
 	void	predictUnconstraintMotion(float timeStep);
 	
 	void	integrateTransforms(float timeStep);
@@ -42,10 +44,12 @@ protected:
 public:
 
 
-	btSimpleDynamicsWorld(btDispatcher* dispatcher,btOverlappingPairCache* pairCache,btConstraintSolver* constraintSolver);
-
+	///this btSimpleDynamicsWorld constructor creates and owns dispatcher, broadphase pairCache and constraintSolver
 	btSimpleDynamicsWorld();
 
+	///this btSimpleDynamicsWorld constructor creates dispatcher, broadphase pairCache and constraintSolver
+	btSimpleDynamicsWorld(btDispatcher* dispatcher,btOverlappingPairCache* pairCache,btConstraintSolver* constraintSolver);
+
 	virtual ~btSimpleDynamicsWorld();
 		
 	virtual void	stepSimulation( float timeStep);