dos3d

annotate src/palman.c @ 12:c29a6e024950

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author John Tsiombikas <nuclear@member.fsf.org>
date Mon, 28 Nov 2011 05:03:22 +0200
parents 7f12c7d084d5
children
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@4 47 int palm_color_index(unsigned char r, unsigned char g, unsigned char b)
nuclear@4 48 {
nuclear@4 49 int i;
nuclear@4 50
nuclear@4 51 for(i=0; i<ncol; i++) {
nuclear@4 52 if(colors[i].r == r && colors[i].g == g && colors[i].b == b) {
nuclear@4 53 return i;
nuclear@4 54 }
nuclear@4 55 }
nuclear@4 56 return -1;
nuclear@4 57 }
nuclear@4 58
nuclear@1 59 /* TODO: build an octree */
nuclear@1 60 int palm_build(void)
nuclear@1 61 {
nuclear@1 62 int i, j;
nuclear@1 63
nuclear@8 64 if(!ncol) {
nuclear@8 65 return -1;
nuclear@8 66 }
nuclear@8 67
nuclear@1 68 /* gradient range for each color */
nuclear@1 69 range = MAX_COLORS / ncol;
nuclear@1 70
nuclear@8 71 if(range <= 1) {
nuclear@1 72 memcpy(pal, colors, ncol * sizeof *pal);
nuclear@1 73 return 0;
nuclear@1 74 }
nuclear@1 75 pcol = 0;
nuclear@1 76
nuclear@1 77 for(i=0; i<ncol; i++) {
nuclear@6 78 unsigned short r, g, b, dr, dg, db;
nuclear@1 79
nuclear@1 80 base_index[i] = pcol;
nuclear@1 81
nuclear@6 82 dr = ((unsigned short)colors[i].r << 8) / (range - 1);
nuclear@6 83 dg = ((unsigned short)colors[i].g << 8) / (range - 1);
nuclear@6 84 db = ((unsigned short)colors[i].b << 8) / (range - 1);
nuclear@1 85
nuclear@1 86 r = g = b = 0;
nuclear@1 87 for(j=0; j<range; j++) {
nuclear@1 88 pal[pcol].r = (unsigned char)(r >> 8);
nuclear@1 89 pal[pcol].g = (unsigned char)(g >> 8);
nuclear@1 90 pal[pcol].b = (unsigned char)(b >> 8);
nuclear@1 91 pcol++;
nuclear@1 92 r += dr;
nuclear@1 93 g += dg;
nuclear@1 94 b += db;
nuclear@1 95 }
nuclear@1 96 }
nuclear@1 97 return pcol;
nuclear@1 98 }
nuclear@1 99
nuclear@1 100 struct palm_color *palm_palette(void)
nuclear@1 101 {
nuclear@1 102 return pal;
nuclear@1 103 }
nuclear@1 104
nuclear@1 105 int palm_palette_size(void)
nuclear@1 106 {
nuclear@1 107 return pcol;
nuclear@1 108 }
nuclear@1 109
nuclear@1 110
nuclear@1 111 int palm_color_base(unsigned char r, unsigned char g, unsigned char b)
nuclear@1 112 {
nuclear@4 113 int c;
nuclear@1 114
nuclear@4 115 if((c = palm_color_index(r, g, b)) == -1) {
nuclear@4 116 return -1;
nuclear@1 117 }
nuclear@4 118 return base_index[c];
nuclear@1 119 }
nuclear@1 120
nuclear@1 121 int palm_color_range(void)
nuclear@1 122 {
nuclear@1 123 return range;
nuclear@1 124 }