libakgl/include/akgl/util.h

#ifndef _UTIL_H_
#define _UTIL_H_

#include <akerror.h>

typedef struct point {
  int x;
  int y;
  int z;
} point;

typedef struct RectanglePoints {
  point topleft;
  point topright;
  point bottomleft;
  point bottomright;
} RectanglePoints;

#define AKGL_COLLIDE_RECTANGLES(r1x, r1y, r1w, r1h, r2x, r2y, r2w, r2h) ((r1x < (r2x + r2w)) || ((r1x + r1w) > r2x)

akerr_ErrorContext AKERR_NOIGNORE *akgl_rectangle_points(RectanglePoints *dest, SDL_FRect *rect);
akerr_ErrorContext AKERR_NOIGNORE *akgl_collide_point_rectangle(point *p, RectanglePoints *r, bool *collide);
akerr_ErrorContext AKERR_NOIGNORE *akgl_collide_rectangles(SDL_FRect *r1, SDL_FRect *r2, bool *collide);

// These are REALLY slow routines that are only useful in testing harnesses
akerr_ErrorContext AKERR_NOIGNORE *akgl_compare_sdl_surfaces(SDL_Surface *s1, SDL_Surface *s2);
akerr_ErrorContext AKERR_NOIGNORE *akgl_render_and_compare(SDL_Texture *t1, SDL_Texture *t2, int x, int y, int w, int h, char *writeout);

#endif // _UTIL_H_