CLI flag to give P2 the controller

src/app.rs

@@ -74,7 +74,7 @@ impl Application {
     ) -> Self {
         let wgpu = WgpuState::new();
         let icon = load_icon().ok().map(Arc::new);
-        let mappings = MappingProvider::new(persistence.clone());
+        let mappings = MappingProvider::new(persistence.clone(), args.player2_controller);
         let shortcuts = ShortcutProvider::new(persistence.clone());
         let controllers = ControllerManager::new(client.clone(), &mappings);
         let memory = Arc::new(MemoryClient::new(client.clone()));
@@ -84,7 +84,7 @@ impl Application {
             let proxy = proxy.clone();
             thread::spawn(|| process_gamepad_input(mappings, proxy));
         }
-        Self {
+        let app = Self {
             icon,
             wgpu,
             client,
@@ -106,7 +106,16 @@ impl Application {
             init_framebuffers: args.frame_buffers,
             init_registers: args.registers,
             init_terminal: args.terminal,
+        };
+        if args.player2 {
+            app.client
+                .send_command(EmulatorCommand::StartSecondSim(args.rom.clone()));
+
+            app.proxy
+                .send_event(UserEvent::OpenPlayer2)
+                .expect("Failed to open Player 2 window");
         }
+        app
     }
 
     fn open(&mut self, event_loop: &ActiveEventLoop, window: Box<dyn AppWindow>) {

src/config.rs

@@ -40,6 +40,12 @@ pub struct CliArgs {
     /// Watch ROM files for changes, automatically reload
     #[arg(short, long)]
     pub watch: bool,
+    /// Automatically open Player 2 for multiplayer
+    #[arg(long)]
+    pub player2: bool,
+    /// Map the first connected controller to Player 2
+    #[arg(long)]
+    pub player2_controller: bool,
 }
 
 pub const COLOR_PRESETS: [[Color32; 2]; 3] = [

src/input.rs

@@ -272,13 +272,14 @@ impl Mappings for InputMapping {
 #[derive(Clone)]
 pub struct MappingProvider {
     persistence: Persistence,
+    first_gamepad_is_p2: bool,
     device_mappings: Arc<RwLock<HashMap<DeviceId, Arc<RwLock<GamepadMapping>>>>>,
     sim_mappings: HashMap<SimId, Arc<RwLock<InputMapping>>>,
     gamepad_info: Arc<RwLock<HashMap<GamepadId, GamepadInfo>>>,
 }
 
 impl MappingProvider {
-    pub fn new(persistence: Persistence) -> Self {
+    pub fn new(persistence: Persistence, first_gamepad_is_p2: bool) -> Self {
         let mut sim_mappings = HashMap::new();
         let mut device_mappings = HashMap::new();
 
@@ -307,6 +308,7 @@ impl MappingProvider {
             device_mappings: Arc::new(RwLock::new(device_mappings)),
             gamepad_info: Arc::new(RwLock::new(HashMap::new())),
             sim_mappings,
+            first_gamepad_is_p2,
         }
     }
 
@@ -338,7 +340,12 @@ impl MappingProvider {
         .clone();
         drop(lock);
         let mut lock = self.gamepad_info.write().unwrap();
-        let bound_to = SimId::values()
+        let players = if self.first_gamepad_is_p2 {
+            vec![SimId::Player2, SimId::Player1]
+        } else {
+            vec![SimId::Player1, SimId::Player2]
+        };
+        let bound_to = players
             .into_iter()
             .find(|sim_id| lock.values().all(|info| info.bound_to != Some(*sim_id)));
         if let Entry::Vacant(entry) = lock.entry(gamepad.id()) {