SDL3

src/Ryujinx.SDL3.Common/SDL3Driver.cs

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+using Ryujinx.Common.Configuration;
+using Ryujinx.Common.Logging;
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.IO;
+using System.Threading;
+using static SDL3.SDL;
+
+namespace Ryujinx.SDL3.Common
+{
+    public class SDL3Driver : IDisposable
+    {
+        private static SDL3Driver _instance;
+
+        public static SDL3Driver Instance
+        {
+            get
+            {
+                _instance ??= new SDL3Driver();
+
+                return _instance;
+            }
+        }
+
+        public static Action<Action> MainThreadDispatcher { get; set; }
+
+        private const SDL_InitFlags SdlInitFlags = SDL_InitFlags.SDL_INIT_GAMEPAD;
+
+        private bool _isRunning;
+        private uint _refereceCount;
+        private Thread _worker;
+
+        public event Action<uint> OnJoyStickConnected;
+        public event Action<uint> OnJoystickDisconnected;
+        public event Action<uint, SDL_JoyBatteryEvent> OnJoyBatteryUpdated;
+
+        private ConcurrentDictionary<uint, Action<SDL_Event>> _registeredWindowHandlers;
+
+        private readonly Lock _lock = new();
+
+        private SDL3Driver() { }
+
+        public void Initialize()
+        {
+            lock (_lock)
+            {
+                _refereceCount++;
+
+                if (_isRunning)
+                {
+                    return;
+                }
+
+                // SDL_SetHint(SDL_HINT_APP_NAME, "Ryujinx");
+                // SDL_SetHint(SDL_HINT_JOYSTICK_HIDAPI_PS4_RUMBLE, "1");
+                // SDL_SetHint(SDL_HINT_JOYSTICK_HIDAPI_PS5_RUMBLE, "1");
+                // SDL_SetHint(SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS, "1");
+                // SDL_SetHint(SDL_HINT_JOYSTICK_HIDAPI_SWITCH_HOME_LED, "0");
+                // SDL_SetHint(SDL_HINT_JOYSTICK_HIDAPI_JOY_CONS, "1");
+                // SDL_SetHint(SDL_HINT_VIDEO_ALLOW_SCREENSAVER, "1");
+                //
+                //
+                // // NOTE: As of SDL2 2.24.0, joycons are combined by default but the motion source only come from one of them.
+                // // We disable this behavior for now.
+                SDL_SetHint(SDL_HINT_JOYSTICK_HIDAPI_COMBINE_JOY_CONS, "0");
+
+                if (!SDL_Init(SdlInitFlags))
+                {
+                    string errorMessage = $"SDL2 initialization failed with error \"{SDL_GetError()}\"";
+
+                    Logger.Error?.Print(LogClass.Application, errorMessage);
+
+                    throw new Exception(errorMessage);
+                }
+
+                // First ensure that we only enable joystick events (for connected/disconnected).
+                if (!SDL_GamepadEventsEnabled())
+                {
+                    Logger.Error?.PrintMsg(LogClass.Application,
+                        "Couldn't change the state of game controller events.");
+                }
+
+                if (!SDL_JoystickEventsEnabled())
+                {
+                    Logger.Error?.PrintMsg(LogClass.Application,
+                        $"Failed to enable joystick event polling: {SDL_GetError()}");
+                }
+
+                // Disable all joysticks information, we don't need them no need to flood the event queue for that.
+                SDL_SetEventEnabled((uint)SDL_EventType.SDL_EVENT_JOYSTICK_AXIS_MOTION, false);
+                SDL_SetEventEnabled((uint)SDL_EventType.SDL_EVENT_JOYSTICK_BALL_MOTION, false);
+                SDL_SetEventEnabled((uint)SDL_EventType.SDL_EVENT_JOYSTICK_HAT_MOTION, false);
+                SDL_SetEventEnabled((uint)SDL_EventType.SDL_EVENT_JOYSTICK_BUTTON_DOWN, false);
+                SDL_SetEventEnabled((uint)SDL_EventType.SDL_EVENT_JOYSTICK_BUTTON_UP, false);
+
+                SDL_SetEventEnabled((uint)SDL_EventType.SDL_EVENT_GAMEPAD_SENSOR_UPDATE, false);
+
+                string gamepadDbPath = Path.Combine(AppDataManager.BaseDirPath, "SDL_GameControllerDB.txt");
+
+                if (File.Exists(gamepadDbPath))
+                {
+                    SDL_AddGamepadMappingsFromFile(gamepadDbPath);
+                }
+
+                _registeredWindowHandlers = new ConcurrentDictionary<uint, Action<SDL_Event>>();
+                _worker = new Thread(EventWorker);
+                _isRunning = true;
+                _worker.Start();
+            }
+        }
+
+        public bool RegisterWindow(uint windowId, Action<SDL_Event> windowEventHandler)
+        {
+            return _registeredWindowHandlers.TryAdd(windowId, windowEventHandler);
+        }
+
+        public void UnregisterWindow(uint windowId)
+        {
+            _registeredWindowHandlers.Remove(windowId, out _);
+        }
+
+        private void HandleSDLEvent(ref SDL_Event evnt)
+        {
+            var type = (SDL_EventType)evnt.type;
+            if (type == SDL_EventType.SDL_EVENT_JOYSTICK_ADDED)
+            {
+
+                uint instanceId = evnt.jdevice.which;
+
+                Logger.Debug?.Print(LogClass.Application, $"Added joystick instance id {instanceId}");
+
+                OnJoyStickConnected?.Invoke(instanceId);
+            }
+            else if (type == SDL_EventType.SDL_EVENT_JOYSTICK_REMOVED)
+            {
+                uint instanceId = evnt.jdevice.which;
+                
+                Logger.Debug?.Print(LogClass.Application, $"Removed joystick instance id {instanceId}");
+
+                OnJoystickDisconnected?.Invoke(instanceId);
+            }
+            else if (type == SDL_EventType.SDL_EVENT_JOYSTICK_BATTERY_UPDATED)
+            {
+                OnJoyBatteryUpdated?.Invoke(evnt.jbattery.which, evnt.jbattery);
+            }
+            else if (type is >= SDL_EventType.SDL_EVENT_WINDOW_FIRST and <= SDL_EventType.SDL_EVENT_WINDOW_LAST or SDL_EventType.SDL_EVENT_MOUSE_BUTTON_DOWN
+                     or SDL_EventType.SDL_EVENT_MOUSE_BUTTON_UP)
+            {
+                if (_registeredWindowHandlers.TryGetValue(evnt.window.windowID, out Action<SDL_Event> handler))
+                {
+                    handler(evnt);
+                }
+            }
+        }
+
+        private void EventWorker()
+        {
+            const int WaitTimeMs = 10;
+
+            using ManualResetEventSlim waitHandle = new(false);
+            while (_isRunning)
+            {
+                MainThreadDispatcher?.Invoke(() =>
+                {
+                    while (SDL_PollEvent(out SDL_Event evnt))
+                    {
+                        HandleSDLEvent(ref evnt);
+                    }
+                });
+
+                waitHandle.Wait(WaitTimeMs);
+            }
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (!disposing)
+            {
+                return;
+            }
+
+            lock (_lock)
+            {
+                if (_isRunning)
+                {
+                    _refereceCount--;
+
+                    if (_refereceCount == 0)
+                    {
+                        _isRunning = false;
+
+                        _worker?.Join();
+
+                        SDL_Quit();
+
+                        OnJoyStickConnected = null;
+                        OnJoystickDisconnected = null;
+                    }
+                }
+            }
+        }
+
+        public void Dispose()
+        {
+            GC.SuppressFinalize(this);
+            Dispose(true);
+        }
+    }
+}