src/videolib/videolib_polymod.h

   1 /* coded by Ketmar // Vampire Avalon (psyc://ketmar.no-ip.org/~Ketmar)
   2  * Understanding is not required. Only obedience.
   3  *
   4  * This program is free software. It comes without any warranty, to
   5  * the extent permitted by applicable law. You can redistribute it
   6  * and/or modify it under the terms of the Do What The Fuck You Want
   7  * To Public License, Version 2, as published by Sam Hocevar. See
   8  * http://sam.zoy.org/wtfpl/COPYING for more details.
   9  */
  10 #ifndef VIDEOLIB_POLYMOD_H
  11 #define VIDEOLIB_POLYMOD_H
  12 #ifdef VIDEOLIB_ENABLE_POLYMOD
  13
  14
  15 /* note that polygons can be concave, but verticies MUST be in clockwise order */
  16 /* rasterizer WILL omit 'right' and 'bottom' points */
  17
  18 /* x, y and x+len-1 will never be offscreen; len will always be positive */
  19 typedef void (*vl_polymod_hline_fn) (int x, int y, int len);
  20
  21 extern vl_polymod_hline_fn vl_polymod_hline;
  22 extern int vl_polymod_screen_width;
  23 extern int vl_polymod_screen_height;
  24
  25 /* filled by vl_polymod_end() */
  26 /* clipped to (0,0)-(vl_polymod_screen_width-1,vl_polymod_screen_height-1) */
  27 extern int vl_polymod_minx;
  28 extern int vl_polymod_miny;
  29 extern int vl_polymod_maxx;
  30 extern int vl_polymod_maxy;
  31
  32 extern void vl_polymod_init (void); /* called once in program startup sequence */
  33 extern void vl_polymod_deinit (void); /* called once in program shutdown sequence */
  34
  35 extern void vl_polymod_start (void); /* called for each new poly */
  36 extern void vl_polymod_add_vertex (int x, int y); /* will ignore duplicate verticies */
  37 extern void vl_polymod_end (void); /* called after the last vertex was added; note that you MUST not specify starting vertex twice! */
  38
  39 extern void vl_polymod_fill (void); /* called after vl_polymod_end() to fill resulting poly with vl_polymod_hline() callback */
  40
  41
  42 #endif
  43 #endif