void VideoDriver_SDL::MainLoop()

{

	cur_ticks = std::chrono::steady_clock::now();

	last_realtime_tick = cur_ticks;

	next_game_tick = cur_ticks;

	if (_draw_threaded) {

		/* Initialise the mutex first, because that's the thing we *need*

		 * directly in the newly created thread. */

		_draw_mutex = new std::recursive_mutex();

		if (_draw_mutex == nullptr) {

			_draw_threaded = false;