2d/tmerge.c

   1 /* $Id: tmerge.c,v 1.3 2002-07-17 21:55:19 bradleyb Exp $ */
   2 /*
   3  * tmerge.c - C Texture merge routines for use with D1X
   4  * Ripped from ldescent by <dph-man@iname.com>
   5  *
   6  */
   7
   8 #ifdef HAVE_CONFIG_H
   9 #include <conf.h>
  10 #endif
  11
  12 #include "gr.h"
  13
  14 void gr_merge_textures( ubyte * lower, ubyte * upper, ubyte * dest )
  15 {
  16  int x,y;
  17  ubyte c;
  18       for (y=0;y<64;y++) for (x=0;x<64;x++) {
  19                 c=upper[64*y+x];
  20                 if (c==TRANSPARENCY_COLOR)
  21                         c=lower[64*y+x];
  22                 *dest++=c;
  23       }
  24 }
  25
  26 void gr_merge_textures_1( ubyte * lower, ubyte * upper, ubyte * dest )
  27 {
  28  int x,y;
  29  ubyte c;
  30         for (y=0; y<64; y++ )
  31                 for (x=0; x<64; x++ )   {
  32                         c = upper[ 64*x+(63-y) ];
  33                         if (c==TRANSPARENCY_COLOR)
  34                                 c = lower[ 64*y+x ];
  35                         *dest++ = c;
  36                 }
  37 }
  38
  39 void gr_merge_textures_2( ubyte * lower, ubyte * upper, ubyte * dest )
  40 {
  41  int x,y;
  42  ubyte c;
  43         for (y=0; y<64; y++ )
  44                 for (x=0; x<64; x++ )   {
  45                         c = upper[ 64*(63-y)+(63-x) ];
  46                         if (c==TRANSPARENCY_COLOR)
  47                                 c = lower[ 64*y+x ];
  48                         *dest++ = c;
  49                 }
  50 }
  51
  52 void gr_merge_textures_3( ubyte * lower, ubyte * upper, ubyte * dest )
  53 {
  54  int x,y;
  55  ubyte c;
  56         for (y=0; y<64; y++ )
  57                 for (x=0; x<64; x++ )   {
  58                         c = upper[ 64*(63-x)+y  ];
  59                         if (c==TRANSPARENCY_COLOR)
  60                                 c = lower[ 64*y+x ];
  61                         *dest++ = c;
  62                 }
  63 }