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/CMakeLists.txt

@@ -0,0 +1,22 @@
+
+INCLUDE_DIRECTORIES(
+${BULLET_PHYSICS_SOURCE_DIR}/src
+)
+
+LIST(APPEND SubDirList "CPU")
+
+
+# Configure use of OpenCL and DX11
+# Generates the settings file and defines libraries and include paths
+OPTION(USE_OPENCL "Use OpenCL"	OFF)
+
+
+
+if( USE_OPENCL )
+	LIST(APPEND SubDirList "OpenCL")
+endif( USE_OPENCL )
+if( USE_DX11 )
+	LIST(APPEND SubDirList "DX11")
+endif( USE_DX11 )
+
+SUBDIRS( ${SubDirList} )