Don't enable relative mouse mode if in touchscreen mode (#14118)

src/client/clientlauncher.cpp

@@ -542,13 +542,13 @@ void ClientLauncher::main_menu(MainMenuData *menudata)
 	}
 	infostream << "Waited for other menus" << std::endl;
 
-#ifndef ANDROID
-	// Cursor can be non-visible when coming from the game
-	m_rendering_engine->get_raw_device()->getCursorControl()->setVisible(true);
-
-	// Set absolute mouse mode
-	m_rendering_engine->get_raw_device()->getCursorControl()->setRelativeMode(false);
-#endif
+	auto *cur_control = m_rendering_engine->get_raw_device()->getCursorControl();
+	if (cur_control) {
+		// Cursor can be non-visible when coming from the game
+		cur_control->setVisible(true);
+		// Set absolute mouse mode
+		cur_control->setRelativeMode(false);
+	}
 
 	/* show main menu */
 	GUIEngine mymenu(&input->joystick, guiroot, m_rendering_engine, &g_menumgr, menudata, *kill);

src/client/game.cpp

@@ -2613,23 +2613,27 @@ void Game::checkZoomEnabled()
 
 void Game::updateCameraDirection(CameraOrientation *cam, float dtime)
 {
-#ifndef __ANDROID__
-	if (isMenuActive())
-		device->getCursorControl()->setRelativeMode(false);
-	else
-		device->getCursorControl()->setRelativeMode(true);
+	auto *cur_control = device->getCursorControl();
+
+	/* With CIrrDeviceSDL on Linux and Windows, enabling relative mouse mode
+	somehow results in simulated mouse events being generated from touch events,
+	although SDL_HINT_MOUSE_TOUCH_EVENTS and SDL_HINT_TOUCH_MOUSE_EVENTS are set to 0.
+	Since Minetest has its own code to synthesize mouse events from touch events,
+	this results in duplicated input. To avoid that, we don't enable relative
+	mouse mode if we're in touchscreen mode. */
+#ifndef HAVE_TOUCHSCREENGUI
+	if (cur_control)
+		cur_control->setRelativeMode(!isMenuActive());
 #endif
 
 	if ((device->isWindowActive() && device->isWindowFocused()
 			&& !isMenuActive()) || input->isRandom()) {
 
-#ifndef __ANDROID__
-		if (!input->isRandom()) {
+		if (cur_control && !input->isRandom()) {
 			// Mac OSX gets upset if this is set every frame
-			if (device->getCursorControl()->isVisible())
-				device->getCursorControl()->setVisible(false);
+			if (cur_control->isVisible())
+				cur_control->setVisible(false);
 		}
-#endif
 
 		if (m_first_loop_after_window_activation) {
 			m_first_loop_after_window_activation = false;
@@ -2641,15 +2645,11 @@ void Game::updateCameraDirection(CameraOrientation *cam, float dtime)
 		}
 
 	} else {
-
-#ifndef ANDROID
 		// Mac OSX gets upset if this is set every frame
-		if (!device->getCursorControl()->isVisible())
-			device->getCursorControl()->setVisible(true);
-#endif
+		if (cur_control && !cur_control->isVisible())
+			cur_control->setVisible(true);
 
 		m_first_loop_after_window_activation = true;
-
 	}
 }