/*!
 * \file
 * \ingroup display
 * \brief handles the (re-)drawing of the scene
 */
#ifndef __DRAW_SCENE_H__
#define __DRAW_SCENE_H__

#include "elwindows.h"

#ifdef __cplusplus
extern "C" {
#endif

extern GLuint paper1_text;

extern char have_display; /*!< Flag indicating whether any window is showing the scene */
extern float camera_x,camera_y,camera_z;
extern float old_camera_x,old_camera_y,old_camera_z,c_delta;
extern float rx,ry,rz;
extern float camera_rotation_speed; /*!< current speed for rotations of the camera */
extern int camera_rotation_frames;
extern float camera_tilt_speed;
extern int camera_tilt_frames;
extern int normal_animation_timer;

extern float fine_camera_rotation_speed; /*!< configurable fine grained speed for rotating the camera */
extern float normal_camera_rotation_speed; /*!< configurable normal speed for rotating the camera */
extern float zoom_level; /*!< current displayed zoom level */
extern int camera_zoom_dir; /*!< direction of where the zoomed camera points to */
extern int camera_zoom_frames;
extern float camera_distance; /*!< The camera is camera_distance*zoom_level (world coordinates) away from your actor. */
extern float new_zoom_level;
extern float scene_mouse_x; /*!< x coordinate of the mouse position */
extern float scene_mouse_y; /*!< y coordinate of the mouse position */

extern int last_texture; /*!< id of the last used texture */

/*! \name texture offset for movement of clouds. 
 * @{ */
extern float clouds_movement_u; /*!< offset for the u coordinate */
extern float clouds_movement_v; /*!< offset for the v coordinate */
/*! @} */

extern Uint32 last_clear_clouds; /*!< timestamp when the clouds cache gets cleared last time */

extern int read_mouse_now; /*!< flag to indicate to reread the status of the mouse */

extern Uint32 draw_delay; /*< the number of milliseconds to wait after drawing a frame */

extern GLenum base_unit,detail_unit,shadow_unit,extra_unit,normal_map_unit;

/*!
 * \ingroup display
 * \brief       draws the current scene and updates the display.
 *
 *      Draws the current scene and updates the display.
 *
 * \callgraph
 */
void draw_scene();

/*!
 * \ingroup move_actors
 * \brief       moves the camera
 *
 *      Moves the camera to the new character position
 *
 * \callgraph
 */
void move_camera ();

/*!
 * \ingroup display
 * \brief   updates the camera and redraws the scene
 *
 *      Updates the camera and redraws the scene
 *
 * \callgraph
 */
void update_camera();

/*!
 * \ingroup misc_utils
 * \brief   CalculateFrustum
 *
 *      CalculateFrustum() to be documented
 *
 * \callgraph
 */
void CalculateFrustum();

/*!
 * \ingroup	move_actors
 * \brief	Gets the temporary locations, rotations of the actors
 *
 * 		Gets the temporary locations, rotations of the actors that will be used when rendering this frame
 */
void get_tmp_actor_data();

/*!
 * \ingroup	display
 * \brief	Window handler that updates the \see have_display flag.
 *
 *		Window handler that updates the \see have_display flag.
 */
int update_have_display(window_info *win);

#ifdef __cplusplus
} // extern "C"
#endif

#endif