2d/tmerge.c

   1 /* $Id: tmerge.c,v 1.4 2002-10-10 18:55:32 btb Exp $ */
   2 /*
   3  *
   4  * tmerge.c - C Texture merge routines for use with D1X
   5  * Ripped from ldescent by <dph-man@iname.com>
   6  *
   7  */
   8
   9 #ifdef HAVE_CONFIG_H
  10 #include <conf.h>
  11 #endif
  12
  13 #include "gr.h"
  14
  15 void gr_merge_textures( ubyte * lower, ubyte * upper, ubyte * dest )
  16 {
  17         int x,y;
  18         ubyte c;
  19         for (y=0;y<64;y++) for (x=0;x<64;x++) {
  20                 c=upper[64*y+x];
  21                 if (c==TRANSPARENCY_COLOR)
  22                         c=lower[64*y+x];
  23                 *dest++=c;
  24         }
  25 }
  26
  27 void gr_merge_textures_1( ubyte * lower, ubyte * upper, ubyte * dest )
  28 {
  29         int x,y;
  30         ubyte c;
  31         for (y=0; y<64; y++ )
  32                 for (x=0; x<64; x++ ) {
  33                         c = upper[ 64*x+(63-y) ];
  34                         if (c==TRANSPARENCY_COLOR)
  35                                 c = lower[ 64*y+x ];
  36                         *dest++ = c;
  37                 }
  38 }
  39
  40 void gr_merge_textures_2( ubyte * lower, ubyte * upper, ubyte * dest )
  41 {
  42  int x,y;
  43  ubyte c;
  44         for (y=0; y<64; y++ )
  45                 for (x=0; x<64; x++ ) {
  46                         c = upper[ 64*(63-y)+(63-x) ];
  47                         if (c==TRANSPARENCY_COLOR)
  48                                 c = lower[ 64*y+x ];
  49                         *dest++ = c;
  50                 }
  51 }
  52
  53 void gr_merge_textures_3( ubyte * lower, ubyte * upper, ubyte * dest )
  54 {
  55  int x,y;
  56  ubyte c;
  57         for (y=0; y<64; y++ )
  58                 for (x=0; x<64; x++ ) {
  59                         c = upper[ 64*(63-x)+y  ];
  60                         if (c==TRANSPARENCY_COLOR)
  61                                 c = lower[ 64*y+x ];
  62                         *dest++ = c;
  63                 }
  64 }