gr.h

   1 #pragma once
   2 #include <SDL/SDL.h>
   3 #include <SDL_opengl.h>
   4
   5 #define SCREEN_WIDTH 20.0
   6 #define SCREEN_HEIGHT 15.0
   7
   8
   9 int RegenerateSprites();
  10 //called internally when there is a need for sprites after InvalidateSprites or externally
  11 //returns 0 on success
  12
  13 void InvalidateSprites();
  14 //call it if you want to queue reload of sprites, for example after screen resize
  15
  16 int DrawSprites();
  17 //draw queued spites
  18 //returns 0 on success
  19
  20 int ClrScr();
  21 //Clear Screen -- may does nothing, check code
  22 //returns 0 on success
  23
  24 int GrInit();
  25 //please call this procedure before anything else from this module
  26 //returns 0 on success
  27
  28 int GrKill();
  29 //please call this when you wanna to kill graphics
  30 //also on exit, because not all platforms frees all resources when process ends
  31
  32
  33
  34 typedef struct{
  35         double width;           //width of a sprite (in game units)
  36         double height;          //height of a sprite (in game units)
  37         double twidth;          //height of the texture in pixels
  38         double theight; //width of the texture in pixels
  39         int z;                  //z
  40         char *fname;            //file name of original SVG
  41         int rotation;           //rotation ( *PI/2.0)
  42         unsigned int SID; //surface ID
  43 }Sprite;
  44
  45 // Because of lazy implementations of OpenGL on some hw, we are using textures with dimensions of power of two
  46 // if you run out of texture memory, try to lower resolution or config.texture_lod
  47 Sprite* LoadSpriteSVG(char *fname, double width, double height);
  48 //returns 0 when failed
  49
  50 void DestroySprite(Sprite *sprite);
  51 Sprite* CopySprite(Sprite *sprite);
  52
  53 void RotateClockwise(Sprite *sprite); //rotate clockwise by PI/2.0
  54 //currently unimplemented
  55
  56 void QueueDrawSprite(Sprite *sprite, double x, double y, int z);
  57 //queue target sprite to be drawn at [x,y] at level z 0-deepest