dxx-rebirth/2d/tmerge.c

/* $Id: tmerge.c,v 1.4 2002-10-10 18:55:32 btb Exp $ */
/*
 *
 * tmerge.c - C Texture merge routines for use with D1X
 * Ripped from ldescent by <dph-man@iname.com>
 *
 */

#ifdef HAVE_CONFIG_H
#include <conf.h>
#endif

#include "gr.h"

void gr_merge_textures( ubyte * lower, ubyte * upper, ubyte * dest )
{
	int x,y;
	ubyte c;
	for (y=0;y<64;y++) for (x=0;x<64;x++) {
		c=upper[64*y+x];
		if (c==TRANSPARENCY_COLOR)
			c=lower[64*y+x];
		*dest++=c;
	}
}

void gr_merge_textures_1( ubyte * lower, ubyte * upper, ubyte * dest )
{
	int x,y;
	ubyte c;
	for (y=0; y<64; y++ )
		for (x=0; x<64; x++ ) {
			c = upper[ 64*x+(63-y) ];
			if (c==TRANSPARENCY_COLOR)
				c = lower[ 64*y+x ];
			*dest++ = c;
		}
}

void gr_merge_textures_2( ubyte * lower, ubyte * upper, ubyte * dest )
{
 int x,y;
 ubyte c;
	for (y=0; y<64; y++ )
		for (x=0; x<64; x++ ) {
			c = upper[ 64*(63-y)+(63-x) ];
			if (c==TRANSPARENCY_COLOR)
				c = lower[ 64*y+x ];
			*dest++ = c;
		}
}

void gr_merge_textures_3( ubyte * lower, ubyte * upper, ubyte * dest )
{
 int x,y;
 ubyte c;
	for (y=0; y<64; y++ )
		for (x=0; x<64; x++ ) {
			c = upper[ 64*(63-x)+y  ];
			if (c==TRANSPARENCY_COLOR)
				c = lower[ 64*y+x ];
			*dest++ = c;
		}
}