Add restart and handle quitting with callback

main.c

@@ -8,6 +8,13 @@
 
 #define MAX(a, b) ((a) < (b) ? (b) : (a))
 
+static bool run;
+
+static void quit()
+{
+	run = false;
+}
+
 int main()
 {
 	const int input_fd = input_init();
@@ -15,6 +22,8 @@ int main()
 	rng_init();
 	game_init(renderer_params.aspect);
 
+	input_on_quit(quit);
+
 	renderer_clear();
 	renderer_swap();
 
@@ -22,7 +31,8 @@ int main()
 	const int max_fd = MAX(input_fd, drm_fd);
 	fd_set set;
 
-	while (!input.quit) {
+	run = true;
+	while (run) {
 		FD_ZERO(&set);
 		FD_SET(input_fd, &set);
 		FD_SET(drm_fd, &set);