Add PhysicsEffects to Extras. The build is only tested on Windows and Android.

The Android/NEON optimized version of Physics Effects is thanks to Graham Rhodes and Anthony Hamilton, See Issue 587

Extras/PhysicsEffects/include/BulletPhysicsEffects/btLowLevelCollisionDispatcher.h

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+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2003-2007 Erwin Coumans  http://bulletphysics.com
+
+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.
+*/
+#ifndef BT_LOW_LEVEL_COLLISION__DISPATCHER_H
+#define BT_LOW_LEVEL_COLLISION__DISPATCHER_H
+
+#include "BulletCollision/CollisionDispatch/btCollisionDispatcher.h"
+struct btLowLevelBroadphase;//struct instead of class?
+struct btLowLevelData;
+///Tuning value to optimized SPU utilization 
+///Too small value means Task overhead is large compared to computation (too fine granularity)
+///Too big value might render some SPUs are idle, while a few other SPUs are doing all work.
+//#define SPU_BATCHSIZE_BROADPHASE_PAIRS 8
+//#define SPU_BATCHSIZE_BROADPHASE_PAIRS 16
+//#define SPU_BATCHSIZE_BROADPHASE_PAIRS 64
+#define SPU_BATCHSIZE_BROADPHASE_PAIRS 128
+//#define SPU_BATCHSIZE_BROADPHASE_PAIRS 256
+//#define SPU_BATCHSIZE_BROADPHASE_PAIRS 512
+//#define SPU_BATCHSIZE_BROADPHASE_PAIRS 1024
+#include "BulletCollision/BroadphaseCollision/btCollisionAlgorithm.h"
+
+class btLowLevelCollisionAlgorithm : public btCollisionAlgorithm
+{
+	btPersistentManifold* m_manifold;
+
+public:
+
+	btLowLevelCollisionAlgorithm()
+		:m_manifold(0)
+	{
+	}
+
+	btLowLevelCollisionAlgorithm(btPersistentManifold* manifold, btCollisionDispatcher* dispatcher)
+		:m_manifold(manifold)
+	{
+		m_dispatcher = dispatcher;
+	}
+	virtual ~btLowLevelCollisionAlgorithm()
+	{
+		if (m_manifold)
+			m_dispatcher->releaseManifold(m_manifold);
+	}
+	virtual void processCollision (btCollisionObject* body0,btCollisionObject* body1,const btDispatcherInfo& dispatchInfo,btManifoldResult* resultOut)
+	{
+		btAssert(0);
+	}
+
+	virtual btScalar calculateTimeOfImpact(btCollisionObject* body0,btCollisionObject* body1,const btDispatcherInfo& dispatchInfo,btManifoldResult* resultOut)
+	{
+		btAssert(0);
+		return 0.f;
+	}
+
+	virtual	void	getAllContactManifolds(btManifoldArray&	manifoldArray)
+	{
+		manifoldArray.push_back(m_manifold);
+	}
+	
+};
+
+
+///btLowLevelCollisionDispatcher can use SPU to gather and calculate collision detection
+///Time of Impact, Closest Points and Penetration Depth.
+class btLowLevelCollisionDispatcher : public btCollisionDispatcher
+{
+
+	btLowLevelData* m_lowLevelData;
+
+	btAlignedObjectArray<btPersistentManifold>	m_manifoldArray;
+	btAlignedObjectArray<btLowLevelCollisionAlgorithm> m_algorithms;
+
+protected:
+
+	void	collision();
+
+public:
+
+	
+	btLowLevelCollisionDispatcher (btLowLevelData* lowLevelData, btCollisionConfiguration* collisionConfiguration, int maxNumManifolds);
+	
+	virtual ~btLowLevelCollisionDispatcher();
+
+	bool	supportsDispatchPairOnSpu(int proxyType0,int proxyType1);
+
+	virtual void	dispatchAllCollisionPairs(btOverlappingPairCache* pairCache,const btDispatcherInfo& dispatchInfo,btDispatcher* dispatcher) ;
+
+	
+
+	virtual btPersistentManifold*	getNewManifold(void* b0,void* b1)
+	{
+		btAssert(0);
+		return 0;
+	}
+	virtual void releaseManifold(btPersistentManifold* manifold);
+
+	
+	virtual	void* allocateCollisionAlgorithm(int size)
+	{
+		btAssert(0);
+		return 0;
+	}
+
+	virtual	void freeCollisionAlgorithm(void* ptr)
+	{
+
+	}
+
+
+
+};
+
+
+
+#endif //BT_LOW_LEVEL_COLLISION__DISPATCHER_H
+
+