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

Extras/RigidBodyGpuPipeline/opencl/primitives/AdlPrimitives/Copy/Copy.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.
+*/
+//Originally written by Takahiro Harada
+
+
+#pragma once
+
+#include <Adl/Adl.h>
+#include <AdlPrimitives/Math/Math.h>
+
+namespace adl
+{
+
+class CopyBase
+{
+	public:
+		enum Option
+		{
+			PER_WI_1, 
+			PER_WI_2, 
+			PER_WI_4, 
+		};
+};
+
+template<DeviceType TYPE>
+class Copy : public CopyBase
+{
+	public:
+		typedef Launcher::BufferInfo BufferInfo;
+
+		struct Data
+		{
+			const Device* m_device;
+			Kernel* m_copy1F4Kernel;
+			Kernel* m_copy2F4Kernel;
+			Kernel* m_copy4F4Kernel;
+			Kernel* m_copyF1Kernel;
+			Kernel* m_copyF2Kernel;
+			Buffer<int4>* m_constBuffer;
+		};
+
+		static
+		Data* allocate(const Device* deviceData);
+
+		static
+		void deallocate(Data* data);
+
+		static
+		void execute( Data* data, Buffer<float4>& dst, Buffer<float4>& src, int n, Option option = PER_WI_1);
+
+		static
+		void execute( Data* data, Buffer<float2>& dst, Buffer<float2>& src, int n);
+
+		static
+		void execute( Data* data, Buffer<float>& dst, Buffer<float>& src, int n);
+};
+
+
+#include <AdlPrimitives/Copy/CopyHost.inl>
+#include <AdlPrimitives/Copy/Copy.inl>
+
+};