1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/palman.c	Mon Nov 21 08:35:58 2011 +0200
     1.3 @@ -0,0 +1,110 @@
     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 +/* TODO: build an octree */
    1.51 +int palm_build(void)
    1.52 +{
    1.53 +	int i, j;
    1.54 +
    1.55 +	/* gradient range for each color */
    1.56 +	range = MAX_COLORS / ncol;
    1.57 +
    1.58 +	if(range == 1) {
    1.59 +		memcpy(pal, colors, ncol * sizeof *pal);
    1.60 +		return 0;
    1.61 +	}
    1.62 +	pcol = 0;
    1.63 +
    1.64 +	for(i=0; i<ncol; i++) {
    1.65 +		unsigned int r, g, b, dr, dg, db;
    1.66 +
    1.67 +		base_index[i] = pcol;
    1.68 +
    1.69 +		dr = (colors[i].r << 8) / (range - 1);
    1.70 +		dg = (colors[i].g << 8) / (range - 1);
    1.71 +		db = (colors[i].b << 8) / (range - 1);
    1.72 +
    1.73 +		r = g = b = 0;
    1.74 +		for(j=0; j<range; j++) {
    1.75 +			pal[pcol].r = (unsigned char)(r >> 8);
    1.76 +			pal[pcol].g = (unsigned char)(g >> 8);
    1.77 +			pal[pcol].b = (unsigned char)(b >> 8);
    1.78 +			pcol++;
    1.79 +			r += dr;
    1.80 +			g += dg;
    1.81 +			b += db;
    1.82 +		}
    1.83 +	}
    1.84 +	return pcol;
    1.85 +}
    1.86 +
    1.87 +struct palm_color *palm_palette(void)
    1.88 +{
    1.89 +	return pal;
    1.90 +}
    1.91 +
    1.92 +int palm_palette_size(void)
    1.93 +{
    1.94 +	return pcol;
    1.95 +}
    1.96 +
    1.97 +
    1.98 +int palm_color_base(unsigned char r, unsigned char g, unsigned char b)
    1.99 +{
   1.100 +	int i;
   1.101 +
   1.102 +	for(i=0; i<pcol; i++) {
   1.103 +		if(colors[i].r == r && colors[i].g == g && colors[i].b == b) {
   1.104 +			return base_index[i];
   1.105 +		}
   1.106 +	}
   1.107 +	return -1;
   1.108 +}
   1.109 +
   1.110 +int palm_color_range(void)
   1.111 +{
   1.112 +	return range;
   1.113 +}