dos3d

annotate src/palman.c @ 1:0b7f840afe4a

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palette management
author John Tsiombikas <nuclear@member.fsf.org>
date Mon, 21 Nov 2011 08:35:58 +0200
parents
children c3e0bccd673e
rev   line source
nuclear@1 1 /*
nuclear@1 2 256-color 3D graphics hack for real-mode DOS.
nuclear@1 3 Copyright (C) 2011 John Tsiombikas <nuclear@member.fsf.org>
nuclear@1 4
nuclear@1 5 This program is free software: you can redistribute it and/or modify
nuclear@1 6 it under the terms of the GNU General Public License as published by
nuclear@1 7 the Free Software Foundation, either version 3 of the License, or
nuclear@1 8 (at your option) any later version.
nuclear@1 9
nuclear@1 10 This program is distributed in the hope that it will be useful,
nuclear@1 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@1 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
nuclear@1 13 GNU General Public License for more details.
nuclear@1 14
nuclear@1 15 You should have received a copy of the GNU General Public License
nuclear@1 16 along with this program. If not, see <http://www.gnu.org/licenses/>.
nuclear@1 17 */
nuclear@1 18
nuclear@1 19 #include <string.h>
nuclear@1 20 #include "palman.h"
nuclear@1 21
nuclear@1 22 #define MAX_COLORS 256
nuclear@1 23 static struct palm_color colors[MAX_COLORS];
nuclear@1 24 static int base_index[MAX_COLORS];
nuclear@1 25
nuclear@1 26 static struct palm_color pal[MAX_COLORS];
nuclear@1 27 static unsigned int ncol, pcol;
nuclear@1 28 static int range;
nuclear@1 29
nuclear@1 30 void palm_clear(void)
nuclear@1 31 {
nuclear@1 32 ncol = 0;
nuclear@1 33 }
nuclear@1 34
nuclear@1 35 int palm_add_color(unsigned char r, unsigned char g, unsigned char b)
nuclear@1 36 {
nuclear@1 37 if(ncol >= MAX_COLORS) {
nuclear@1 38 return -1;
nuclear@1 39 }
nuclear@1 40 colors[ncol].r = r;
nuclear@1 41 colors[ncol].g = g;
nuclear@1 42 colors[ncol].b = b;
nuclear@1 43 ncol++;
nuclear@1 44 return 0;
nuclear@1 45 }
nuclear@1 46
nuclear@1 47 /* TODO: build an octree */
nuclear@1 48 int palm_build(void)
nuclear@1 49 {
nuclear@1 50 int i, j;
nuclear@1 51
nuclear@1 52 /* gradient range for each color */
nuclear@1 53 range = MAX_COLORS / ncol;
nuclear@1 54
nuclear@1 55 if(range == 1) {
nuclear@1 56 memcpy(pal, colors, ncol * sizeof *pal);
nuclear@1 57 return 0;
nuclear@1 58 }
nuclear@1 59 pcol = 0;
nuclear@1 60
nuclear@1 61 for(i=0; i<ncol; i++) {
nuclear@1 62 unsigned int r, g, b, dr, dg, db;
nuclear@1 63
nuclear@1 64 base_index[i] = pcol;
nuclear@1 65
nuclear@1 66 dr = (colors[i].r << 8) / (range - 1);
nuclear@1 67 dg = (colors[i].g << 8) / (range - 1);
nuclear@1 68 db = (colors[i].b << 8) / (range - 1);
nuclear@1 69
nuclear@1 70 r = g = b = 0;
nuclear@1 71 for(j=0; j<range; j++) {
nuclear@1 72 pal[pcol].r = (unsigned char)(r >> 8);
nuclear@1 73 pal[pcol].g = (unsigned char)(g >> 8);
nuclear@1 74 pal[pcol].b = (unsigned char)(b >> 8);
nuclear@1 75 pcol++;
nuclear@1 76 r += dr;
nuclear@1 77 g += dg;
nuclear@1 78 b += db;
nuclear@1 79 }
nuclear@1 80 }
nuclear@1 81 return pcol;
nuclear@1 82 }
nuclear@1 83
nuclear@1 84 struct palm_color *palm_palette(void)
nuclear@1 85 {
nuclear@1 86 return pal;
nuclear@1 87 }
nuclear@1 88
nuclear@1 89 int palm_palette_size(void)
nuclear@1 90 {
nuclear@1 91 return pcol;
nuclear@1 92 }
nuclear@1 93
nuclear@1 94
nuclear@1 95 int palm_color_base(unsigned char r, unsigned char g, unsigned char b)
nuclear@1 96 {
nuclear@1 97 int i;
nuclear@1 98
nuclear@1 99 for(i=0; i<pcol; i++) {
nuclear@1 100 if(colors[i].r == r && colors[i].g == g && colors[i].b == b) {
nuclear@1 101 return base_index[i];
nuclear@1 102 }
nuclear@1 103 }
nuclear@1 104 return -1;
nuclear@1 105 }
nuclear@1 106
nuclear@1 107 int palm_color_range(void)
nuclear@1 108 {
nuclear@1 109 return range;
nuclear@1 110 }