scene.h
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	#ifndef __SCENE_H__
	#define __SCENE_H__

	/*
	* This namespace manages all "low level"
	* rendering state and functions
	*
	* Idea: All graphical components
	* are contained in a "linked" list such that,
	* for every frame and for each component
	* its "update" method is called.
	*
	*
	*
	*/

	/* Forward declarations */
	class Shape;
	class Camera;

	/* This include is necessary!
	* Forward declaration doesn't work for template types
	*/
	#include <list>

	/* Iterator typedef to loop through all components */
	typedef std::list<Shape*>::iterator obj_iter;

	/* Graphics scene manager */

	namespace scene
	{
	/* time unit setting, global variable */
	extern float delta_time;

	/* Init function for the symulation scene */
	void initialize(Camera*);

	/* Safely close the symulation scene */
	void close();

	/* Objects iterator */
	obj_iter obj_beg();

	/* End objects iterator */
	obj_iter obj_end();

	/* Get the camera instance */
	Camera * camera();

	/* Registers a object into the graphics engine (OpenGL) */
	void registerObj(Shape*);

	/* Unregister a object which is in the graphics engine (OpenGL) */
	void unregisterObj(Shape*);

	/* Unregister all object */
	void unregisterAll();

	/* Update the entire scene, called every frame */
	void update(const float *dt = 0);
	}

	#endif