/* 
   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_CAMERA_H__
#define __INCLUDED_CAMERA_H__

#include "gl/osiriongl.h"

namespace client {

/// camera functions
/** The functions in this namespace performs the transformations
for the camera eye location. The camera always looks at (0,0,0)
*/
class Camera
{
public:
	/// enum indicating the camera mode
	enum Mode {Free, Track};

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

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

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

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

protected:
	/// default tracking pitch
	static const float track_pitch; 
	/// default offset increment
	static const float offset_inc; 
	
	/// current yaw, angle in XZ plane, positive is looking left
	static float yaw; 
	/// current pitch, angle in XY, positive is looking up
	static float pitch; 

	static Mode mode;
};

} // namespace client
	
#endif // __INCLUDED_CAMERA_H__