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 #include <conf.h>
   5 #ifdef NO_ASM // If for some reason we have elected not to use assembler...
   6
   7 #include "gr.h"
   8
   9 void gr_merge_textures( ubyte * lower, ubyte * upper, ubyte * dest )
  10 {
  11  int x,y;
  12  ubyte c;
  13       for (y=0;y<64;y++) for (x=0;x<64;x++) {
  14                 c=upper[64*y+x];
  15                 if (c==TRANSPARENCY_COLOR)
  16                         c=lower[64*y+x];
  17                 *dest++=c;
  18       }
  19 }
  20
  21 void gr_merge_textures_1( ubyte * lower, ubyte * upper, ubyte * dest )
  22 {
  23  int x,y;
  24  ubyte c;
  25         for (y=0; y<64; y++ )
  26                 for (x=0; x<64; x++ )   {
  27                         c = upper[ 64*x+(63-y) ];
  28                         if (c==TRANSPARENCY_COLOR)
  29                                 c = lower[ 64*y+x ];
  30                         *dest++ = c;
  31                 }
  32 }
  33
  34 void gr_merge_textures_2( ubyte * lower, ubyte * upper, ubyte * dest )
  35 {
  36  int x,y;
  37  ubyte c;
  38         for (y=0; y<64; y++ )
  39                 for (x=0; x<64; x++ )   {
  40                         c = upper[ 64*(63-y)+(63-x) ];
  41                         if (c==TRANSPARENCY_COLOR)
  42                                 c = lower[ 64*y+x ];
  43                         *dest++ = c;
  44                 }
  45 }
  46
  47 void gr_merge_textures_3( ubyte * lower, ubyte * upper, ubyte * dest )
  48 {
  49  int x,y;
  50  ubyte c;
  51         for (y=0; y<64; y++ )
  52                 for (x=0; x<64; x++ )   {
  53                         c = upper[ 64*(63-x)+y  ];
  54                         if (c==TRANSPARENCY_COLOR)
  55                                 c = lower[ 64*y+x ];
  56                         *dest++ = c;
  57                 }
  58 }
  59
  60
  61 #endif