add .bullet loader for GPU demo

demo/gpudemo/rigidbody/BulletDataExtractor.h

@@ -0,0 +1,53 @@
+#ifndef BULLET_DATA_EXTRACTOR_H
+#define BULLET_DATA_EXTRACTOR_H
+
+
+#include "Bullet3Serialize/Bullet2FileLoader/autogenerated/bullet2.h"
+#include "Bullet3Common/b3AlignedObjectArray.h"
+#include "Bullet3Common/b3Vector3.h"
+
+class GLInstancingRenderer;
+class b3GpuRigidBodyPipeline;
+class b3GpuNarrowPhase;
+
+void createScene(GLInstancingRenderer& renderer,b3GpuNarrowPhase& np, b3GpuRigidBodyPipeline& rbWorld, const char* fileName);
+
+namespace bParse
+{
+	class btBulletFile;
+};
+
+class btBulletDataExtractor
+{
+	GLInstancingRenderer&		m_renderer;
+	b3GpuNarrowPhase&			m_np;
+	b3GpuRigidBodyPipeline&		m_rbPipeline;
+
+	public:
+
+	b3AlignedObjectArray<struct InstanceGroup*> m_instanceGroups;
+	b3AlignedObjectArray<struct GraphicsShape*> m_graphicsShapes;
+
+	btBulletDataExtractor(GLInstancingRenderer&	renderer, b3GpuNarrowPhase&	np, b3GpuRigidBodyPipeline& rbPipeline);
+	
+	virtual ~btBulletDataExtractor();
+	
+	virtual void convertAllObjects(bParse::btBulletFile* bulletFile);
+	
+	//return -1 for invalid
+	virtual int convertCollisionShape(  Bullet::btCollisionShapeData* shapeData  );
+
+	virtual int createPlaneShape( const Bullet::btVector3FloatData& planeNormal, float planeConstant, const Bullet::btVector3FloatData& localScaling);
+	
+	virtual int createBoxShape( const Bullet::btVector3FloatData& halfDimensions, const Bullet::btVector3FloatData& localScaling, float collisionMargin);
+
+	virtual int createSphereShape( float radius, const Bullet::btVector3FloatData& localScaling, float collisionMargin);
+
+	static GraphicsShape* createGraphicsShapeFromConvexHull(const b3Vector3* tmpPoints, int numPoints);
+	static GraphicsShape* createGraphicsShapeFromWavefrontObj(class objLoader* obj);
+
+};
+
+
+	
+#endif //BULLET_DATA_EXTRACTOR_H