int o = al_get_display_orientation(display);
if (o == ALLEGRO_DISPLAY_ORIENTATION_270_DEGREES) {
	al_change_display_option(display, ALLEGRO_SUPPORTED_ORIENTATIONS, ALLEGRO_DISPLAY_ORIENTATION_270_DEGREES);
}
else {
	al_change_display_option(display, ALLEGRO_SUPPORTED_ORIENTATIONS, ALLEGRO_DISPLAY_ORIENTATION_90_DEGREES);
}