1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/palman.c	Fri Mar 15 16:46:41 2013 +0200
     1.3 @@ -0,0 +1,124 @@
     1.4 +/*
     1.5 +256-color 3D graphics hack for real-mode DOS.
     1.6 +Copyright (C) 2011  John Tsiombikas <nuclear@member.fsf.org>
     1.7 +
     1.8 +This program is free software: you can redistribute it and/or modify
     1.9 +it under the terms of the GNU General Public License as published by
    1.10 +the Free Software Foundation, either version 3 of the License, or
    1.11 +(at your option) any later version.
    1.12 +
    1.13 +This program is distributed in the hope that it will be useful,
    1.14 +but WITHOUT ANY WARRANTY; without even the implied warranty of
    1.15 +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    1.16 +GNU General Public License for more details.
    1.17 +
    1.18 +You should have received a copy of the GNU General Public License
    1.19 +along with this program.  If not, see <http://www.gnu.org/licenses/>.
    1.20 +*/
    1.21 +
    1.22 +#include <string.h>
    1.23 +#include "palman.h"
    1.24 +
    1.25 +#define MAX_COLORS		256
    1.26 +static struct palm_color colors[MAX_COLORS];
    1.27 +static int base_index[MAX_COLORS];
    1.28 +
    1.29 +static struct palm_color pal[MAX_COLORS];
    1.30 +static unsigned int ncol, pcol;
    1.31 +static int range;
    1.32 +
    1.33 +void palm_clear(void)
    1.34 +{
    1.35 +	ncol = 0;
    1.36 +}
    1.37 +
    1.38 +int palm_add_color(unsigned char r, unsigned char g, unsigned char b)
    1.39 +{
    1.40 +	if(ncol >= MAX_COLORS) {
    1.41 +		return -1;
    1.42 +	}
    1.43 +	colors[ncol].r = r;
    1.44 +	colors[ncol].g = g;
    1.45 +	colors[ncol].b = b;
    1.46 +	ncol++;
    1.47 +	return 0;
    1.48 +}
    1.49 +
    1.50 +int palm_color_index(unsigned char r, unsigned char g, unsigned char b)
    1.51 +{
    1.52 +	int i;
    1.53 +
    1.54 +	for(i=0; i<ncol; i++) {
    1.55 +		if(colors[i].r == r && colors[i].g == g && colors[i].b == b) {
    1.56 +			return i;
    1.57 +		}
    1.58 +	}
    1.59 +	return -1;
    1.60 +}
    1.61 +
    1.62 +/* TODO: build an octree */
    1.63 +int palm_build(void)
    1.64 +{
    1.65 +	int i, j;
    1.66 +
    1.67 +	if(!ncol) {
    1.68 +		return -1;
    1.69 +	}
    1.70 +
    1.71 +	/* gradient range for each color */
    1.72 +	range = MAX_COLORS / ncol;
    1.73 +
    1.74 +	if(range <= 1) {
    1.75 +		memcpy(pal, colors, ncol * sizeof *pal);
    1.76 +		return 0;
    1.77 +	}
    1.78 +	pcol = 0;
    1.79 +
    1.80 +	for(i=0; i<ncol; i++) {
    1.81 +		unsigned short r, g, b, dr, dg, db;
    1.82 +
    1.83 +		base_index[i] = pcol;
    1.84 +
    1.85 +		dr = ((unsigned short)colors[i].r << 8) / (range - 1);
    1.86 +		dg = ((unsigned short)colors[i].g << 8) / (range - 1);
    1.87 +		db = ((unsigned short)colors[i].b << 8) / (range - 1);
    1.88 +
    1.89 +		r = g = b = 0;
    1.90 +		for(j=0; j<range; j++) {
    1.91 +			pal[pcol].r = (unsigned char)(r >> 8);
    1.92 +			pal[pcol].g = (unsigned char)(g >> 8);
    1.93 +			pal[pcol].b = (unsigned char)(b >> 8);
    1.94 +			pcol++;
    1.95 +			r += dr;
    1.96 +			g += dg;
    1.97 +			b += db;
    1.98 +		}
    1.99 +	}
   1.100 +	return pcol;
   1.101 +}
   1.102 +
   1.103 +struct palm_color *palm_palette(void)
   1.104 +{
   1.105 +	return pal;
   1.106 +}
   1.107 +
   1.108 +int palm_palette_size(void)
   1.109 +{
   1.110 +	return pcol;
   1.111 +}
   1.112 +
   1.113 +
   1.114 +int palm_color_base(unsigned char r, unsigned char g, unsigned char b)
   1.115 +{
   1.116 +	int c;
   1.117 +
   1.118 +	if((c = palm_color_index(r, g, b)) == -1) {
   1.119 +		return -1;
   1.120 +	}
   1.121 +	return base_index[c];
   1.122 +}
   1.123 +
   1.124 +int palm_color_range(void)
   1.125 +{
   1.126 +	return range;
   1.127 +}