2d/tmerge.c

   1 // tmerge.c - C Texture merge routines for use with D1X
   2 // Ripped from ldescent by <dph-man@iname.com>
   3
   4 #ifdef HAVE_CONFIG_H
   5 #include <conf.h>
   6 #endif
   7
   8 #include "gr.h"
   9
  10 void gr_merge_textures( ubyte * lower, ubyte * upper, ubyte * dest )
  11 {
  12  int x,y;
  13  ubyte c;
  14       for (y=0;y<64;y++) for (x=0;x<64;x++) {
  15                 c=upper[64*y+x];
  16                 if (c==TRANSPARENCY_COLOR)
  17                         c=lower[64*y+x];
  18                 *dest++=c;
  19       }
  20 }
  21
  22 void gr_merge_textures_1( ubyte * lower, ubyte * upper, ubyte * dest )
  23 {
  24  int x,y;
  25  ubyte c;
  26         for (y=0; y<64; y++ )
  27                 for (x=0; x<64; x++ )   {
  28                         c = upper[ 64*x+(63-y) ];
  29                         if (c==TRANSPARENCY_COLOR)
  30                                 c = lower[ 64*y+x ];
  31                         *dest++ = c;
  32                 }
  33 }
  34
  35 void gr_merge_textures_2( ubyte * lower, ubyte * upper, ubyte * dest )
  36 {
  37  int x,y;
  38  ubyte c;
  39         for (y=0; y<64; y++ )
  40                 for (x=0; x<64; x++ )   {
  41                         c = upper[ 64*(63-y)+(63-x) ];
  42                         if (c==TRANSPARENCY_COLOR)
  43                                 c = lower[ 64*y+x ];
  44                         *dest++ = c;
  45                 }
  46 }
  47
  48 void gr_merge_textures_3( ubyte * lower, ubyte * upper, ubyte * dest )
  49 {
  50  int x,y;
  51  ubyte c;
  52         for (y=0; y<64; y++ )
  53                 for (x=0; x<64; x++ )   {
  54                         c = upper[ 64*(63-x)+y  ];
  55                         if (c==TRANSPARENCY_COLOR)
  56                                 c = lower[ 64*y+x ];
  57                         *dest++ = c;
  58                 }
  59 }