Auto-toggle TouchControls in-game when receiving touch/mouse input

src/client/game.cpp

@@ -723,6 +723,7 @@ protected:
 	void processUserInput(f32 dtime);
 	void processKeyInput();
 	void processItemSelection(u16 *new_playeritem);
+	bool shouldShowTouchControls();
 
 	void dropSelectedItem(bool single_item = false);
 	void openInventory();
@@ -1565,6 +1566,14 @@ bool Game::createClient(const GameStartData &start_data)
 	return true;
 }
 
+bool Game::shouldShowTouchControls()
+{
+	const std::string &touch_controls = g_settings->get("touch_controls");
+	if (touch_controls == "auto")
+		return RenderingEngine::getLastPointerType() == PointerType::Touch;
+	return is_yes(touch_controls);
+}
+
 bool Game::initGui()
 {
 	m_game_ui->init();
@@ -1579,7 +1588,7 @@ bool Game::initGui()
 	gui_chat_console = make_irr<GUIChatConsole>(guienv, guienv->getRootGUIElement(),
 			-1, chat_backend, client, &g_menumgr);
 
-	if (g_settings->getBool("touch_controls")) {
+	if (shouldShowTouchControls()) {
 		g_touchcontrols = new TouchControls(device, texture_src);
 		g_touchcontrols->setUseCrosshair(!isTouchCrosshairDisabled());
 	}
@@ -2031,6 +2040,15 @@ void Game::updateStats(RunStats *stats, const FpsControl &draw_times,
 
 void Game::processUserInput(f32 dtime)
 {
+	bool desired = shouldShowTouchControls();
+	if (desired && !g_touchcontrols) {
+		g_touchcontrols = new TouchControls(device, texture_src);
+
+	} else if (!desired && g_touchcontrols) {
+		delete g_touchcontrols;
+		g_touchcontrols = nullptr;
+	}
+
 	// Reset input if window not active or some menu is active
 	if (!device->isWindowActive() || isMenuActive() || guienv->hasFocus(gui_chat_console.get())) {
 		if (m_game_focused) {