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/main.cpp

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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.
+*/
+//Originally written by Erwin Coumans
+
+#include "BasicDemo.h"
+#include "GlutStuff.h"
+#include "btBulletDynamicsCommon.h"
+#include "LinearMath/btHashMap.h"
+
+#ifdef CL_PLATFORM_AMD
+#include "../../opencl/basic_initialize/btOpenCLUtils.h"
+extern cl_context			g_cxMainContext;
+extern cl_command_queue	g_cqCommandQue;
+extern cl_device_id		g_clDevice;
+#endif
+
+
+	
+int main(int argc,char** argv)
+{
+
+	#ifdef CL_PLATFORM_AMD
+	int ciErrNum = 0;
+	const char* vendorSDK = btOpenCLUtils::getSdkVendorName();
+	printf("This program was compiled using the %s OpenCL SDK\n",vendorSDK);
+
+	cl_device_type deviceType = CL_DEVICE_TYPE_GPU;//CPU;//GPU;
+	
+	
+	void* glCtx=0;
+	void* glDC = 0;
+	g_cxMainContext = btOpenCLUtils::createContextFromType(deviceType, &ciErrNum, glCtx, glDC);
+	oclCHECKERROR(ciErrNum, CL_SUCCESS);
+
+	int numDev = btOpenCLUtils::getNumDevices(g_cxMainContext);
+
+	if (numDev>0)
+	{
+		int deviceIndex =0;
+		g_clDevice = btOpenCLUtils::getDevice(g_cxMainContext,deviceIndex);
+		btOpenCLDeviceInfo clInfo;
+		btOpenCLUtils::getDeviceInfo(g_clDevice,clInfo);
+		btOpenCLUtils::printDeviceInfo(g_clDevice);
+		// create a command-queue
+		g_cqCommandQue = clCreateCommandQueue(g_cxMainContext, g_clDevice, 0, &ciErrNum);
+		oclCHECKERROR(ciErrNum, CL_SUCCESS);
+	}
+#endif //#ifdef CL_PLATFORM_AMD
+
+
+	BasicDemo ccdDemo;
+	ccdDemo.initPhysics();
+	
+
+#ifdef CHECK_MEMORY_LEAKS
+	ccdDemo.exitPhysics();
+#else
+	glutmain(argc, argv,1024,600,"Bullet Physics Demo. http://bulletphysics.org",&ccdDemo);
+#endif
+	
+	//setupGUI(1024,768);
+	glutMainLoop();
+	//default glut doesn't return from mainloop
+	return 0;
+}
+