103 lines
2.1 KiB
C++
103 lines
2.1 KiB
C++
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/*
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* Create normal map textures from regular textures.
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* Created by: Erik Hofman
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*
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* This file is in public domain.
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*/
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#include <string.h>
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#include <GL/gl.h>
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#include <simgear/screen/texture.hxx>
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static float contrast = 1.0;
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static float brightness = 1.0;
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static char *texture_file = NULL, *normalmap_file = NULL;
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static SGTexture texture;
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int parse_option(char **args, int n) {
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char *opt, *arg;
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int sz, ret=1;
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opt = args[n];
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if (*(opt+1) == '-')
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opt++;
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if ((arg = strchr(opt, '=')) != NULL)
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*arg++ = 0;
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else {
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ret++;
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arg = args[n+1];
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}
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sz = strlen(opt);
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if (!strncmp(opt, "-help", sz)) {
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printf("usage:\n normalmap [-c=contrast] [-b=brightness]");
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printf(" --t=file [--o=file]\n");
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exit(0);
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}
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if (!strncmp(opt, "-contrast", sz)) {
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contrast = atof(arg);
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return ret;
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}
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if (!strncmp(opt, "-brightness", sz)) {
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brightness = atof(arg);
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return ret;
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}
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if (!strncmp(opt, "-texture", sz) ||
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!strncmp(opt, "-input", sz)) {
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texture_file = strdup(arg);
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return ret;
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}
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if (!strncmp(opt, "-normalmap", sz) ||
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!strncmp(opt, "-output", sz)) {
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normalmap_file = strdup(arg);
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return ret;
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}
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return 1;
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}
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int main (int argc, char **argv)
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{
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int i;
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for (i=1; i<argc;)
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i += parse_option(argv, i);
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if ( !texture_file )
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{
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printf("Error: texture file not specified\n");
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return -1;
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}
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texture.read_rgb_texture(texture_file);
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if ( !texture.texture() )
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{
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printf("Error: unable to process input file: %s\n", texture_file);
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printf(" (%s)\n", texture.err_str());
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return -2;
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}
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if ( !normalmap_file )
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{
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int i;
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for (i=strlen(texture_file); i>=0; --i)
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if (texture_file[i] == '.')
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break;
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normalmap_file = (char *)malloc( i+8 );
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memcpy(normalmap_file, texture_file, i);
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memcpy(normalmap_file+i, "_n.rgb\0", 7);
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}
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texture.make_normalmap();
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texture.write_texture(normalmap_file);
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free( normalmap_file );
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free( texture_file );
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return 0;
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}
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