dostunnel

annotate src/texture.c @ 2:a52d0b786ce1

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author John Tsiombikas <nuclear@member.fsf.org>
date Fri, 15 Mar 2013 19:55:29 +0200
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nuclear@0 1 /*
nuclear@0 2 256-color 3D graphics hack for real-mode DOS.
nuclear@0 3 Copyright (C) 2011 John Tsiombikas <nuclear@member.fsf.org>
nuclear@0 4
nuclear@0 5 This program is free software: you can redistribute it and/or modify
nuclear@0 6 it under the terms of the GNU General Public License as published by
nuclear@0 7 the Free Software Foundation, either version 3 of the License, or
nuclear@0 8 (at your option) any later version.
nuclear@0 9
nuclear@0 10 This program is distributed in the hope that it will be useful,
nuclear@0 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@0 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
nuclear@0 13 GNU General Public License for more details.
nuclear@0 14
nuclear@0 15 You should have received a copy of the GNU General Public License
nuclear@0 16 along with this program. If not, see <http://www.gnu.org/licenses/>.
nuclear@0 17 */
nuclear@0 18
nuclear@0 19 #include <stdio.h>
nuclear@0 20 #include <string.h>
nuclear@0 21 #include <stdlib.h>
nuclear@0 22 #include "texture.h"
nuclear@0 23 #include "palman.h"
nuclear@0 24
nuclear@0 25 struct texture *load_texture(const char *fname)
nuclear@0 26 {
nuclear@0 27 long i, num_pixels;
nuclear@0 28 struct texture *tex;
nuclear@0 29 long fpos;
nuclear@0 30
nuclear@0 31 if(!(tex = malloc(sizeof *tex))) {
nuclear@0 32 return 0;
nuclear@0 33 }
nuclear@0 34 memset(tex, 0, sizeof *tex);
nuclear@0 35
nuclear@0 36 if(!(tex->file = fopen(fname, "rb"))) {
nuclear@0 37 fprintf(stderr, "failed to open texture: %s\n", fname);
nuclear@0 38 free_texture(tex);
nuclear@0 39 return 0;
nuclear@0 40 }
nuclear@0 41 if(fscanf(tex->file, "P6 %d %d 255 ", &tex->width, &tex->height) != 2) {
nuclear@0 42 fprintf(stderr, "invalid pixmap: %s\n", fname);
nuclear@0 43 free_texture(tex);
nuclear@0 44 return 0;
nuclear@0 45 }
nuclear@0 46 fpos = ftell(tex->file);
nuclear@0 47
nuclear@0 48 num_pixels = tex->width * tex->height;
nuclear@0 49 for(i=0; i<num_pixels; i++) {
nuclear@0 50 int r, g, b;
nuclear@0 51
nuclear@0 52 r = fgetc(tex->file);
nuclear@0 53 g = fgetc(tex->file);
nuclear@0 54 b = fgetc(tex->file);
nuclear@0 55
nuclear@0 56 if(feof(tex->file)) {
nuclear@0 57 fprintf(stderr, "unexpected EOF while reading: %s\n", fname);
nuclear@0 58 free_texture(tex);
nuclear@0 59 return 0;
nuclear@0 60 }
nuclear@0 61
nuclear@0 62 if(palm_color_index(r, g, b) == -1) {
nuclear@0 63 palm_add_color(r, g, b);
nuclear@0 64 }
nuclear@0 65 }
nuclear@0 66 fseek(tex->file, fpos, SEEK_SET);
nuclear@0 67 return tex;
nuclear@0 68 }
nuclear@0 69
nuclear@0 70 void free_texture(struct texture *tex)
nuclear@0 71 {
nuclear@0 72 if(tex) {
nuclear@0 73 if(tex->file) {
nuclear@0 74 fclose(tex->file);
nuclear@0 75 }
nuclear@0 76 free(tex->pixels);
nuclear@0 77 free(tex);
nuclear@0 78 }
nuclear@0 79 }
nuclear@0 80
nuclear@0 81 unsigned char *get_texture_pixels(struct texture *tex)
nuclear@0 82 {
nuclear@0 83 if(!tex->pixels && tex->file) {
nuclear@0 84 long i, num_pixels = tex->width * tex->height;
nuclear@0 85
nuclear@0 86 if(!(tex->pixels = malloc(num_pixels))) {
nuclear@0 87 return 0;
nuclear@0 88 }
nuclear@0 89
nuclear@0 90 for(i=0; i<num_pixels; i++) {
nuclear@0 91 int r, g, b, base;
nuclear@0 92
nuclear@0 93 r = fgetc(tex->file);
nuclear@0 94 g = fgetc(tex->file);
nuclear@0 95 b = fgetc(tex->file);
nuclear@0 96
nuclear@0 97 if((base = palm_color_base(r, g, b)) == -1) {
nuclear@0 98 base = 0;
nuclear@0 99 }
nuclear@0 100 tex->pixels[i] = base;
nuclear@0 101 }
nuclear@0 102
nuclear@0 103 fclose(tex->file);
nuclear@0 104 tex->file = 0;
nuclear@0 105 }
nuclear@0 106
nuclear@0 107 return tex->pixels;
nuclear@0 108 }
nuclear@0 109
nuclear@0 110 struct texture *tex_gen_checker(int xsz, int ysz, int ush, int vsh, int c1, int c2)
nuclear@0 111 {
nuclear@0 112 int i, j;
nuclear@0 113 struct texture *tex;
nuclear@0 114 unsigned char *pptr;
nuclear@0 115
nuclear@0 116 if(!(tex = malloc(sizeof *tex))) {
nuclear@0 117 return 0;
nuclear@0 118 }
nuclear@0 119 memset(tex, 0, sizeof *tex);
nuclear@0 120
nuclear@0 121 if(!(tex->pixels = malloc(xsz * ysz))) {
nuclear@0 122 free(tex);
nuclear@0 123 return 0;
nuclear@0 124 }
nuclear@0 125 tex->width = xsz;
nuclear@0 126 tex->height = ysz;
nuclear@0 127
nuclear@0 128 pptr = tex->pixels;
nuclear@0 129 for(i=0; i<ysz; i++) {
nuclear@0 130 for(j=0; j<xsz; j++) {
nuclear@0 131 int c = ((i >> vsh) & 1) == ((j >> ush) & 1) ? c1 : c2;
nuclear@0 132 *pptr++ = c;
nuclear@0 133 }
nuclear@0 134 }
nuclear@0 135 return tex;
nuclear@0 136 }