chore: SDL3 (ryubing/ryujinx!207)

See merge request ryubing/ryujinx!207

src/Ryujinx.Input.SDL3/SDLKeyboardDriver.cs

@@ -0,0 +1,64 @@
+using Ryujinx.SDL3.Common;
+using System;
+using System.Collections.Generic;
+
+namespace Ryujinx.Input.SDL3
+{
+    public class SDL3KeyboardDriver : IGamepadDriver
+    {
+        public SDL3KeyboardDriver()
+        {
+            SDL3Driver.Instance.Initialize();
+        }
+
+        public string DriverName => "SDL3";
+
+        private static readonly string[] _keyboardIdentifers = ["0"];
+
+        public ReadOnlySpan<string> GamepadsIds => _keyboardIdentifers;
+
+        public event Action<string> OnGamepadConnected
+        {
+            add { }
+            remove { }
+        }
+
+        public event Action<string> OnGamepadDisconnected
+        {
+            add { }
+            remove { }
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                SDL3Driver.Instance.Dispose();
+            }
+        }
+
+        public void Dispose()
+        {
+            GC.SuppressFinalize(this);
+            Dispose(true);
+        }
+
+        public IGamepad GetGamepad(string id)
+        {
+            if (!_keyboardIdentifers[0].Equals(id))
+            {
+                return null;
+            }
+
+            return new SDL3Keyboard(this, _keyboardIdentifers[0], "All keyboards");
+        }
+
+        public IEnumerable<IGamepad> GetGamepads()
+        {
+            foreach (string keyboardId in _keyboardIdentifers)
+            {
+                yield return GetGamepad(keyboardId);
+            }
+        }
+    }
+}