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

#ifndef __INCLUDED_CLIENT_CAMERA_H__
#define __INCLUDED_CLIENT_CAMERA_H__

#include "render/render.h"

namespace client {

/// camera functions
/** The functions in the camera namespace perform the transformations
 *  for the camera eye location. The camera always looks at (0,0,0)
 */
namespace camera
{
	/// enum indicating the camera mode
	enum Mode {Free, Track, Overview};

	/// initialize the camera
	extern void init();

	/// shutdown the camera
	extern void shutdown();

	/// draw the OpenGL camera transformation
	extern void draw(float elapsed);

	/// rotate the camera left
	extern void rotate_left();
	/// rotate the camera right
	extern void rotate_right();
	/// rotate the camera up
	extern void rotate_up();
	/// rotate the camera down
	extern void rotate_down();

	/// switch to next camera mode
	extern void nextmode();
	
	/// camera target
	/** The location the camera is looking at */
	extern math::Vector3f target;

	/// target yaw, angle in XZ plane, positive is looking left
	extern float yaw_target; 
	/// target pitch, angle in XZ plane, positive is looking left
	extern float pitch_target; 
	/// distance from the camera to the target
	extern float distance;
	/// current camera mode
	extern Mode mode;

} // namespace camera

} // namespace client
	
#endif // __INCLUDED_CLIENT_CAMERA_H__