opt.sball = bool_value(value);
} else if(strcmp(line, "vsync") == 0) {
opt.vsync = bool_value(value);
opt.sball = bool_value(value);
} else if(strcmp(line, "vsync") == 0) {
opt.vsync = bool_value(value);
} else {
fprintf(stderr, "%s:%d invalid option: %s\n", fname, nline, line);
return -1;
} else {
fprintf(stderr, "%s:%d invalid option: %s\n", fname, nline, line);
return -1;