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/*
   core/gameinterface.h
   This file is part of the Osirion project and is distributed under 
   the terms of the GNU General Public License version 2 
*/

#ifndef __INCLUDED_CORE_GAMEINTERFACE_H__
#define __INCLUDED_CORE_GAMEINTERFACE_H__

namespace core
{

/// abstract interface from the core to the game-specific code
/** The real game class has to derive from this class
 */
class GameInterface {
public:
	/// create a new game singleton
	GameInterface();
	/// destroy the game singleton
	virtual ~GameInterface();

	/// initialize the game
	virtual void init();

	/// shutdown the game
	virtual void shutdown();

	/// run one frame of the game
	/** @param sec time since the previous frame, in seconds
	 */
	virtual void frame (float seconds);

	/// a pointer to the current game instance
	static GameInterface * instance();

	/// return true if the game is ready and running
	bool ready() const;

	/// return the current game time, in seconds
	float time() const;

private:
	static GameInterface *gameinterface_instance;
	
	bool game_ready;

	float current_time;
};

}

#endif // __INCLUDED_CORE_GAMEINTERFACE_H__