added OpenCL cloth demo, contributed by AMD.

updated GpuSoftBodySolvers
updated DirectCompute cloth demo

Demos/OpenCLClothDemo/btOpenCLSupport.h

@@ -0,0 +1,84 @@
+#ifndef BT_OPENCL_SUPPORT_HPP
+#define BT_OPENCL_SUPPORT_HPP
+
+// OpenCL support
+#include <CL/cl.hpp>
+
+namespace BTAcceleratedSoftBody
+{
+	class OpenCLSupportHelper
+	{
+	private:
+		cl::Context m_context;
+		std::vector<cl::Device> m_devices;
+		cl::CommandQueue m_queue;
+	public:
+		OpenCLSupportHelper()
+		{
+		}
+
+		virtual ~OpenCLSupportHelper()
+		{
+		}
+
+		cl::Device getDevice()
+		{
+			return m_devices[0];
+		}
+
+		cl::CommandQueue getCommandQueue()
+		{
+			return m_queue;
+		}
+
+		cl::Context getContext()
+		{
+			return m_context;
+		}
+
+		bool InitOpenCLDevice()
+		{
+			cl_int err;
+
+			std::vector<cl::Platform> platforms;
+			err = cl::Platform::get(&platforms);
+			checkErr(platforms.size() != 0 ? CL_SUCCESS : -1, "Platform::get()");
+
+			std::string platformVendor;
+			platforms[0].getInfo(CL_PLATFORM_VENDOR, &platformVendor);
+			//std::cout << "Platform is by: " << platformVendor << "\n";
+
+			intptr_t properties[] = {
+				CL_CONTEXT_PLATFORM, (intptr_t)platforms[0](),
+				0, 0
+			};
+			m_context = cl::Context(
+				CL_DEVICE_TYPE_GPU, 
+				properties, 
+				NULL, 
+				NULL, 
+				&err);
+
+			if (err != CL_SUCCESS)
+			{
+				btAssert( "Context::Context()" );
+			}
+
+			m_devices = m_context.getInfo<CL_CONTEXT_DEVICES>();
+			if( m_devices.size() <= 0 ) 
+			{
+				btAssert( "devices.size() > 0" );
+			}
+		
+			m_queue = cl::CommandQueue(m_context, m_devices[0], 0, &err);
+		    if (err != CL_SUCCESS) 
+			{
+				btAssert( "CommandQueue::CommandQueue()");
+			}
+		}
+	};
+
+
+} // namespace BTAcceleratedSoftBody
+
+#endif // #ifndef BT_OPENCL_SUPPORT_HPP