#include <SDL2/SDL_video.h>
#include <assert.h>
+#include <getopt.h>
#include <stdio.h>
#include <unistd.h>
int main(int argc, char **argv)
{
+ static const option long_options[] = {
+ { "alpha", required_argument, 0, 'a' },
+ { "delta", required_argument, 0, 'd' },
+ { "gamma", required_argument, 0, 'g' }
+ };
+
+ for ( ;; ) {
+ int option_index = 0;
+ int c = getopt_long(argc, argv, "a:d:g:", long_options, &option_index);
+
+ if (c == -1) {
+ break;
+ }
+ switch (c) {
+ case 'a':
+ vr_alpha = atof(optarg);
+ break;
+ case 'd':
+ vr_delta = atof(optarg);
+ break;
+ case 'g':
+ vr_gamma = atof(optarg);
+ break;
+ default:
+ fprintf(stderr, "Unknown option '%s'\n", argv[option_index]);
+ exit(1);
+ };
+ }
+
if (SDL_Init(SDL_INIT_EVERYTHING) == -1) {
fprintf(stderr, "SDL_Init failed: %s\n", SDL_GetError());
exit(1);
// Load pictures.
unsigned width1, height1, width2, height2;
- GLuint tex0 = load_texture(argc >= 2 ? argv[1] : "test1499.png", &width1, &height1);
- GLuint tex1 = load_texture(argc >= 3 ? argv[2] : "test1500.png", &width2, &height2);
+ GLuint tex0 = load_texture(argc >= (optind + 1) ? argv[optind] : "test1499.png", &width1, &height1);
+ GLuint tex1 = load_texture(argc >= (optind + 2) ? argv[optind + 1] : "test1500.png", &width2, &height2);
if (width1 != width2 || height1 != height2) {
fprintf(stderr, "Image dimensions don't match (%dx%d versus %dx%d)\n",