Added GPU SoftBody constraint solvers for DirectX 11 (Direct Compute) and OpenCL, thanks to AMD.

See also http://code.google.com/p/bullet/issues/detail?id=390
Added Demos/DX11ClothDemo
(an OpenCL cloth demo will follow soon)

src/BulletMultiThreaded/GpuSoftBodySolvers/DX11/CMakeLists.txt

@@ -0,0 +1,76 @@
+
+INCLUDE_DIRECTORIES(
+${BULLET_PHYSICS_SOURCE_DIR}/src
+)
+
+SET(DXSDK_DIR $ENV{DXSDK_DIR})
+SET(DX11_INCLUDE_PATH  "${DIRECTX_SDK_BASE_DIR}/Include" CACHE DOCSTRING "Microsoft directX SDK include path")
+
+
+INCLUDE_DIRECTORIES(
+${DX11_INCLUDE_PATH} "../cpu/"
+${VECTOR_MATH_INCLUDE}
+)
+
+SET(BulletSoftBodyDX11Solvers_SRCS
+	btSoftBodySolver_DX11.cpp
+)
+
+SET(BulletSoftBodyDX11Solvers_HDRS
+	btSoftBodySolver_DX11.h
+	../cpu/btSoftBodySolverData.h
+	btSoftBodySolverVertexData_DX11.h
+	btSoftBodySolverTriangleData_DX11.h
+	btSoftBodySolverLinkData_DX11.h
+	btSoftBodySolverBuffer_DX11.h
+	btSoftBodySolverVertexBuffer_DX11.h
+
+)
+
+# OpenCL and HLSL Shaders.
+# Build rules generated to stringify these into headers
+# which are needed by some of the sources
+SET(BulletSoftBodyDX11Solvers_Shaders
+	OutputToVertexArray
+	UpdateNormals
+	Integrate
+	UpdatePositions
+	UpdateNodes
+	SolvePositions
+	UpdatePositionsFromVelocities
+	ApplyForces
+	PrepareLinks
+	VSolveLinks
+)
+
+foreach(f ${BulletSoftBodyDX11Solvers_Shaders})
+    LIST(APPEND BulletSoftBodyDX11Solvers_HLSL "HLSL/${f}.hlsl")
+endforeach(f) 
+
+
+
+ADD_LIBRARY(BulletSoftBodySolvers_DX11  ${BulletSoftBodyDX11Solvers_SRCS} ${BulletSoftBodyDX11Solvers_HDRS} ${BulletSoftBodyDX11Solvers_HLSL})
+SET_TARGET_PROPERTIES(BulletSoftBodySolvers_DX11 PROPERTIES VERSION ${BULLET_VERSION})
+SET_TARGET_PROPERTIES(BulletSoftBodySolvers_DX11 PROPERTIES SOVERSION ${BULLET_VERSION})
+IF (BUILD_SHARED_LIBS)
+	TARGET_LINK_LIBRARIES(BulletSoftBody BulletDynamics)
+ENDIF (BUILD_SHARED_LIBS)
+
+
+IF (INSTALL_LIBS)
+	IF (NOT INTERNAL_CREATE_DISTRIBUTABLE_MSVC_PROJECTFILES)
+		IF (${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION} GREATER 2.5)
+			IF (APPLE AND BUILD_SHARED_LIBS AND FRAMEWORK)
+				INSTALL(TARGETS BulletSoftBodySolvers_DX11 DESTINATION .)
+			ELSE (APPLE AND BUILD_SHARED_LIBS AND FRAMEWORK)
+			INSTALL(TARGETS BulletSoftBodySolvers_DX11 DESTINATION lib${LIB_SUFFIX})
+				INSTALL(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} DESTINATION include FILES_MATCHING PATTERN "*.h")
+			ENDIF (APPLE AND BUILD_SHARED_LIBS AND FRAMEWORK)
+		ENDIF (${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION} GREATER 2.5)
+
+		IF (APPLE AND BUILD_SHARED_LIBS AND FRAMEWORK)
+			SET_TARGET_PROPERTIES(BulletSoftBodySolvers_DX11 PROPERTIES FRAMEWORK true)
+			SET_TARGET_PROPERTIES(BulletSoftBodySolvers_DX11 PROPERTIES PUBLIC_HEADER "${BulletSoftBodyDX11Solvers_HDRS}")
+		ENDIF (APPLE AND BUILD_SHARED_LIBS AND FRAMEWORK)
+	ENDIF (NOT INTERNAL_CREATE_DISTRIBUTABLE_MSVC_PROJECTFILES)
+ENDIF (INSTALL_LIBS)