add wavefront loader

start adding various scenes to test gpu rigid body pipeline
reserve more memory for shapes (concave triangle mesh can be huge) in GLInstancingRenderer
fix a few crashes when 0 objects

demo/gpudemo/rigidbody/GpuRigidBodyDemoInternalData.h

@@ -0,0 +1,30 @@
+#ifndef GPU_RIGIDBODY_INTERNAL_DATA_H
+#define GPU_RIGIDBODY_INTERNAL_DATA_H
+
+#include "basic_initialize/btOpenCLUtils.h"
+#include "parallel_primitives/host/btOpenCLArray.h"
+#include "BulletCommon/btVector3.h"
+
+struct	GpuRigidBodyDemoInternalData
+{
+	
+	cl_kernel	m_copyTransformsToVBOKernel;
+
+	btOpenCLArray<btVector4>*	m_instancePosOrnColor;
+
+	class btGpuRigidBodyPipeline* m_rigidBodyPipeline;
+
+	class btGpuNarrowPhase* m_np;
+	class btGpuSapBroadphase* m_bp;
+
+	GpuRigidBodyDemoInternalData()
+		:m_instancePosOrnColor(0),
+		m_copyTransformsToVBOKernel(0),	m_rigidBodyPipeline(0),
+		m_np(0),
+		m_bp(0)
+	{
+	}
+};
+
+#endif//GPU_RIGIDBODY_INTERNAL_DATA_H
+