Added a setting to only accept input from the first controller.

es-app/src/guis/GuiMenu.cpp

@@ -759,6 +759,20 @@ void GuiMenu::openInputDeviceOptions()
 {
     auto s = new GuiSettings(mWindow, "INPUT DEVICE SETTINGS");
 
+    // Whether to only accept input from the first controller.
+    auto input_only_first_controller = std::make_shared<SwitchComponent>(mWindow);
+    input_only_first_controller->setState(Settings::getInstance()->
+            getBool("InputOnlyFirstController"));
+    s->addWithLabel("ONLY ACCEPT INPUT FROM FIRST CONTROLLER", input_only_first_controller);
+    s->addSaveFunc([input_only_first_controller, s] {
+        if (Settings::getInstance()->getBool("InputOnlyFirstController") !=
+                input_only_first_controller->getState()) {
+            Settings::getInstance()->setBool("InputOnlyFirstController",
+                    input_only_first_controller->getState());
+            s->setNeedsSaving();
+        }
+    });
+
     // Configure keyboard and controllers.
     ComponentListRow configure_input_row;
     configure_input_row.elements.clear();

es-core/src/InputManager.cpp

@@ -357,6 +357,11 @@ bool InputManager::parseEvent(const SDL_Event& event, Window* window)
 
     switch (event.type) {
         case SDL_CONTROLLERAXISMOTION: {
+        // Whether to only accept input from the first controller.
+        if (Settings::getInstance()->getBool("InputOnlyFirstController"))
+            if (mInputConfigs.begin()->first != event.cdevice.which)
+                return false;
+
             // This is needed for a situation which sometimes occur when a game is launched,
             // some axis input is generated and then the controller is disconnected before
             // leaving the game. In this case, events for the old device index could be received
@@ -395,6 +400,11 @@ bool InputManager::parseEvent(const SDL_Event& event, Window* window)
         case SDL_CONTROLLERBUTTONDOWN: {
         }
         case SDL_CONTROLLERBUTTONUP: {
+        // Whether to only accept input from the first controller.
+        if (Settings::getInstance()->getBool("InputOnlyFirstController"))
+            if (mInputConfigs.begin()->first != event.cdevice.which)
+                return false;
+
             // The event filtering below is required as some controllers send button presses
             // starting with the state 0 when using the D-pad. I consider this invalid behaviour
             // and the more popular controllers such as those from Microsoft and Sony do not show

es-core/src/Settings.cpp

@@ -196,6 +196,9 @@ void Settings::setDefaults()
     mBoolMap["ScreensaverVideoAudio"] = { false, false };
     mBoolMap["NavigationSounds"] = { true, true };
 
+    // Input device settings.
+    mBoolMap["InputOnlyFirstController"] = { false, false };
+
     // Game collection settings.
     mStringMap["CollectionSystemsAuto"] = { "", "" };
     mStringMap["CollectionSystemsCustom"] = { "", "" };