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/Fill/FillHost.inl

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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
+
+template<>
+class Fill<TYPE_HOST>
+{
+	public:
+		struct Data
+		{
+		};
+
+		static
+		Data* allocate(const Device* deviceData)
+		{
+			return 0;
+		}
+
+		static
+		void deallocate(Data* data)
+		{
+
+		}
+
+		template<typename T>
+		static
+		void executeImpl(Data* data, Buffer<T>& src, const T& value, int n, int offset = 0)
+		{
+			ADLASSERT( src.getType() == TYPE_HOST );
+			ADLASSERT( src.m_size >= offset+n );
+			HostBuffer<T>& hSrc = (HostBuffer<T>&)src;
+
+			for(int idx=offset; idx<offset+n; idx++)
+			{
+				hSrc[idx] = value;
+			}
+		}
+
+		static
+		void execute(Data* data, Buffer<int>& src, const int& value, int n, int offset = 0)
+		{
+			executeImpl( data, src, value, n, offset );
+		}
+
+		static
+		void execute(Data* data, Buffer<int2>& src, const int2& value, int n, int offset = 0)
+		{
+			executeImpl( data, src, value, n, offset );
+		}
+
+		static
+		void execute(Data* data, Buffer<int4>& src, const int4& value, int n, int offset = 0)
+		{
+			executeImpl( data, src, value, n, offset );
+		}
+
+/*
+		static
+		void execute(Data* data, Buffer<int>& src, int value, int n, int offset = 0)
+		{
+			ADLASSERT( src.getType() == TYPE_HOST );
+			ADLASSERT( src.m_size <= offset+n );
+			HostBuffer<u32>& hSrc = (HostBuffer<u32>&)src;
+
+			for(int idx=offset; idx<offset+n; idx++)
+			{
+				src[i] = value;
+			}
+		}
+
+		static
+		void execute(Data* data, Buffer<int2>& src, const int2& value, int n, int offset = 0)
+		{
+			ADLASSERT( src.getType() == TYPE_HOST );
+			ADLASSERT( src.m_size <= offset+n );
+
+		}
+
+		static
+		void execute(Data* data, Buffer<int4>& src, const int4& value, int n, int offset = 0)
+		{
+			ADLASSERT( src.getType() == TYPE_HOST );
+			ADLASSERT( src.m_size <= offset+n );
+
+		}
+*/
+};
+