add Intel build support for the OpenCL cloth demo, and use the bullet_logo.png

Thanks to ggjunker for the patch, see Issue 533

Demos/ParticlesOpenCL/CMakeLists.txt

@@ -2,6 +2,10 @@ IF(BUILD_MINICL_OPENCL_DEMOS)
 	SUBDIRS( MiniCL  )
 ENDIF()
 
+IF(BUILD_INTEL_OPENCL_DEMOS)
+	SUBDIRS(Intel)
+ENDIF()
+
 IF(BUILD_AMD_OPENCL_DEMOS)
 	SUBDIRS(AMD)
 ENDIF()

Demos/ParticlesOpenCL/btParticlesDemoDynamicsWorld.cpp

@@ -339,8 +339,12 @@ void btParticlesDynamicsWorld::initCLKernels(int argc, char** argv)
 	{
 //		m_cxMainContext = clCreateContextFromType(0, CL_DEVICE_TYPE_ALL, NULL, NULL, &ciErrNum);
 
+#ifdef USE_INTEL_OPENCL
+		m_cxMainContext = btOclCommon::createContextFromType(CL_DEVICE_TYPE_ALL, &ciErrNum);
+#else
 		m_cxMainContext = btOclCommon::createContextFromType(CL_DEVICE_TYPE_GPU, &ciErrNum);
-		//m_cxMainContext = btOclCommon::createContextFromType(CL_DEVICE_TYPE_ALL, &ciErrNum);
+#endif
+	
 		oclCHECKERROR(ciErrNum, CL_SUCCESS);
 		m_cdDevice = btOclGetMaxFlopsDev(m_cxMainContext);