Method Tick

src/video/video_driver.cpp:104–171

}

void VideoDriver::Tick()
{
	if (!this->is_game_threaded && std::chrono::steady_clock::now() >= this->next_game_tick) {
		this->GameLoop();

		/* For things like dedicated server, don't run a separate draw-tick. */
		if (!this->HasGUI()) {
			::InputLoop();
			::UpdateWindows();
			this->next_draw_tick = this->next_game_tick;
		}
	}

	auto now = std::chrono::steady_clock::now();
	if (this->HasGUI() && now >= this->next_draw_tick) {
		this->next_draw_tick += this->GetDrawInterval();
		/* Avoid next_draw_tick getting behind more and more if it cannot keep up. */
		if (this->next_draw_tick < now - ALLOWED_DRIFT * this->GetDrawInterval()) this->next_draw_tick = now;

		/* Locking video buffer can block (especially with vsync enabled), do it before taking game state lock. */
		this->LockVideoBuffer();

		{
			/* Tell the game-thread to stop so we can have a go. */
			std::lock_guard<std::mutex> lock_wait(this->game_thread_wait_mutex);
			std::lock_guard<std::mutex> lock_state(this->game_state_mutex);

			/* Keep the interactive randomizer a bit more random by requesting
			 * new values when-ever we can. */
			InteractiveRandom();

			this->DrainCommandQueue();

			while (this->PollEvent()) {}
			this->InputLoop();

			/* Check if the fast-forward button is still pressed. */
			if (fast_forward_key_pressed && !_networking && _game_mode != GM_MENU) {
				ChangeGameSpeed(true);
				this->fast_forward_via_key = true;
			} else if (this->fast_forward_via_key) {
				ChangeGameSpeed(false);
				this->fast_forward_via_key = false;
			}

			::InputLoop();

			/* Prevent drawing when switching mode, as windows can be removed when they should still appear. */
			if (_game_mode == GM_BOOTSTRAP || _switch_mode == SM_NONE || HasModalProgress()) {
				::UpdateWindows();
			}

			this->PopulateSystemSprites();
		}

		this->CheckPaletteAnim();
		this->Paint();