Add the GPU rigid body pipeline from https://github.com/erwincoumans/experiments as a Bullet 3.x preview for Bullet 2.80

Extras/RigidBodyGpuPipeline/dynamics/basic_demo/CustomCollisionDispatcher.h

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+/*
+Copyright (c) 2012 Advanced Micro Devices, Inc.  
+
+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 CUSTOM_COLLISION_DISPATCHER_H
+#define CUSTOM_COLLISION_DISPATCHER_H
+
+
+#include "BulletCollision/CollisionDispatch/btCollisionDispatcher.h"
+#include "BulletCollision/BroadphaseCollision/btOverlappingPairCache.h"
+
+
+#define MAX_CONVEX_BODIES_CL 64*1024
+#define MAX_PAIRS_PER_BODY_CL 32
+#define MAX_CONVEX_SHAPES_CL 8192
+#define MAX_BROADPHASE_COLLISION_CL (MAX_CONVEX_BODIES_CL*MAX_PAIRS_PER_BODY_CL)
+
+
+
+struct	CustomDispatchData;
+
+#ifdef CL_PLATFORM_AMD
+#ifdef __APPLE__
+	#ifdef USE_MINICL
+		#include <MiniCL/cl.h>
+	#else
+		#include <OpenCL/cl.h>
+	#endif
+#else //__APPLE__
+	#ifdef USE_MINICL
+		#include <MiniCL/cl.h>
+	#else
+		#include <CL/cl.h>
+	#endif
+#endif //__APPLE__
+#endif
+
+class CustomCollisionDispatcher : public btCollisionDispatcher
+{
+public:
+	CustomCollisionDispatcher (btCollisionConfiguration* collisionConfiguration
+#ifdef CL_PLATFORM_AMD
+		, cl_context context = NULL,cl_device_id device = NULL,cl_command_queue queue = NULL
+#endif //CL_PLATFORM_AMD
+		);
+
+	virtual ~CustomCollisionDispatcher(void);
+
+protected:
+
+	CustomDispatchData*	m_internalData;
+
+	btBroadphasePair* GetPair(btBroadphasePairArray& pairArray, int idxBodyA, int idxBodyB);
+
+public:
+	virtual void dispatchAllCollisionPairs(btOverlappingPairCache* pairCache,const btDispatcherInfo& dispatchInfo,btDispatcher* dispatcher);
+};
+
+#endif //CUSTOM_COLLISION_DISPATCHER_H