static void setgamma(struct wl_listener *listener, void *data);

static struct wlr_gamma_control_manager_v1 *gamma_control_mgr;

static struct wl_listener request_gamma = {.notify = setgamma};

}
void
setgamma(struct wl_listener *listener, void *data)
{
	struct wlr_gamma_control_manager_v1_set_gamma_event *event = data;
	if (!wlr_gamma_control_v1_apply(event->control, &event->output->pending))
		return;
	if (!wlr_output_test(event->output)) {
		wlr_output_rollback(event->output);
		wlr_gamma_control_v1_send_failed_and_destroy(event->control);
	}
	wlr_output_schedule_frame(event->output);

	wlr_gamma_control_manager_v1_create(dpy);

	gamma_control_mgr = wlr_gamma_control_manager_v1_create(dpy);
	wl_signal_add(&gamma_control_mgr->events.set_gamma, &request_gamma);