/*! 
    \file graphics_engine.h
    
    \brief defines a Interface between orxonox and graphical input

    handles graphical SDL-initialisation, textures, resolutions, and so on
*/

#ifndef _GRAPHICS_ENGINE_H
#define _GRAPHICS_ENGINE_H

#include "glincl.h"
#include "base_object.h"


class Text;


class GraphicsEngine : public BaseObject 
{
 public:
  static GraphicsEngine* getInstance();
  virtual ~GraphicsEngine();

  int initVideo();
  int setGLattribs(void);
  int setResolution(int width, int height, int bpp);
  void setFullscreen(bool fullscreen = false);
  static void setBackgroundColor(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha = 1.0);

  /** \returns the x resolution */
  inline int getResolutionX(void) {return this->resolutionX;}
  /** \returns the y resolution */
  inline int getResolutionY(void) {return this->resolutionY;}
  /** \returns the Bits Per Pixel */
  inline int getbbp(void) {return this->bitsPerPixel;}
  int resolutionChanged(SDL_ResizeEvent* resizeInfo);
  void listModes(void);

  static bool texturesEnabled;

  static void enter2DMode(void);
  static void leave2DMode(void);

  static void storeMatrices(void);
  static GLdouble modMat[16];
  static GLdouble projMat[16];
  static GLint viewPort[4];
  
  void tick(float dt);
  void displayFPS(bool display);


 private:
  GraphicsEngine();
  static GraphicsEngine* singletonRef;


  SDL_Surface* screen;
  int resolutionX;
  int resolutionY;
  int bitsPerPixel;
  bool fullscreen;
  Uint32 videoFlags;
  
  bool bDisplayFPS;  //!< is true if the fps should be displayed
  float currentFPS;  //!< the current frame rate: frames per seconds
  float maxFPS;      //!< maximal frame rate we ever got since start of the game
  float minFPS;      //!< minimal frame rate we ever got since start

  Text* geTextCFPS;
  Text* geTextMaxFPS;
  Text* geTextMinFPS;

  SDL_Rect **videoModes;
};

#endif /* _GRAPHICS_ENGINE_H */