minor cleanup of btgui/demo3 stuff, much more demo cleanup is needed

moved some files in btgui/Bullet3AppSupport

btgui/Bullet3AppSupport/BulletDemoInterface.h

@@ -0,0 +1,66 @@
+#ifndef DEMO_INTERFACE_H
+#define DEMO_INTERFACE_H
+
+struct SimpleOpenGL3App;
+
+class BulletDemoInterface
+{
+public:
+
+	typedef class BulletDemoInterface* (CreateFunc)(SimpleOpenGL3App* app);
+
+	virtual ~BulletDemoInterface()
+	{
+	}
+
+	virtual void    initPhysics()=0;
+	virtual void    exitPhysics()=0;
+	virtual void	stepSimulation(float deltaTime)=0;
+	virtual void	renderScene()=0;
+	virtual void	physicsDebugDraw()=0;
+	virtual bool	mouseMoveCallback(float x,float y)=0;
+	virtual bool	mouseButtonCallback(int button, int state, float x, float y)=0;
+	virtual bool	keyboardCallback(int key, int state)=0;
+
+};
+
+class EmptyBulletDemo : public BulletDemoInterface
+{
+public:
+	static BulletDemoInterface* MyCreateFunc(SimpleOpenGL3App* app)
+	{
+		return new EmptyBulletDemo();
+	}
+
+	virtual void    initPhysics()
+	{
+	}
+	virtual void    exitPhysics()
+	{
+	}
+	virtual void	stepSimulation(float deltaTime)
+	{
+	}
+	virtual void	renderScene()
+	{
+	}
+	virtual void	physicsDebugDraw()
+	{
+	}
+	virtual bool	mouseMoveCallback(float x,float y)
+	{
+		return false;
+	}
+	virtual bool	mouseButtonCallback(int button, int state, float x, float y)
+	{
+		return false;
+	}
+	virtual bool	keyboardCallback(int key, int state)
+	{
+		return false;
+	}
+};
+
+
+#endif //DEMO_INTERFACE_H
+