Add option to change controller LED color

src/Ryujinx.Common/Configuration/Hid/Controller/LedConfigController.cs

@@ -2,14 +2,24 @@
 {
     public class LedConfigController
     {
-        /// <summary>
-        ///     Packed RGB int of the color
-        /// </summary>
-        public uint LedColor { get; set; }
-
         /// <summary>
         /// Enable LED color changing by the emulator
         /// </summary>
         public bool EnableLed { get; set; }
+
+        /// <summary>
+        /// Ignores the color and disables the LED entirely.
+        /// </summary>
+        public bool TurnOffLed { get; set; }
+
+        /// <summary>
+        /// Ignores the color and uses the rainbow color functionality for the LED.
+        /// </summary>
+        public bool UseRainbow { get; set; }
+
+        /// <summary>
+        ///     Packed RGB int of the color
+        /// </summary>
+        public uint LedColor { get; set; }
     }
 }

src/Ryujinx.Common/Utilities/Rainbow.cs

@@ -0,0 +1,76 @@
+using System;
+using System.Drawing;
+
+namespace Ryujinx.Common.Utilities
+{
+    public class Rainbow
+    {
+        public const float Speed = 1;
+
+        public static Color Color { get; private set; } = Color.Blue;
+
+        public static void Tick()
+        {
+            Color = HsbToRgb(
+                (Color.GetHue() + Speed) / 360,
+                1, 
+                1
+                );
+
+            RainbowColorUpdated?.Invoke(Color.ToArgb());
+        }
+
+        public static event Action<int> RainbowColorUpdated;
+
+        private static Color HsbToRgb(float hue, float saturation, float brightness)
+        {
+            int r = 0, g = 0, b = 0;
+            if (saturation == 0)
+            {
+                r = g = b = (int)(brightness * 255.0f + 0.5f);
+            }
+            else
+            {
+                float h = (hue - (float)Math.Floor(hue)) * 6.0f;
+                float f = h - (float)Math.Floor(h);
+                float p = brightness * (1.0f - saturation);
+                float q = brightness * (1.0f - saturation * f);
+                float t = brightness * (1.0f - (saturation * (1.0f - f)));
+                switch ((int)h)
+                {
+                    case 0:
+                        r = (int)(brightness * 255.0f + 0.5f);
+                        g = (int)(t * 255.0f + 0.5f);
+                        b = (int)(p * 255.0f + 0.5f);
+                        break;
+                    case 1:
+                        r = (int)(q * 255.0f + 0.5f);
+                        g = (int)(brightness * 255.0f + 0.5f);
+                        b = (int)(p * 255.0f + 0.5f);
+                        break;
+                    case 2:
+                        r = (int)(p * 255.0f + 0.5f);
+                        g = (int)(brightness * 255.0f + 0.5f);
+                        b = (int)(t * 255.0f + 0.5f);
+                        break;
+                    case 3:
+                        r = (int)(p * 255.0f + 0.5f);
+                        g = (int)(q * 255.0f + 0.5f);
+                        b = (int)(brightness * 255.0f + 0.5f);
+                        break;
+                    case 4:
+                        r = (int)(t * 255.0f + 0.5f);
+                        g = (int)(p * 255.0f + 0.5f);
+                        b = (int)(brightness * 255.0f + 0.5f);
+                        break;
+                    case 5:
+                        r = (int)(brightness * 255.0f + 0.5f);
+                        g = (int)(p * 255.0f + 0.5f);
+                        b = (int)(q * 255.0f + 0.5f);
+                        break;
+                }
+            }
+            return Color.FromArgb(Convert.ToByte(255), Convert.ToByte(r), Convert.ToByte(g), Convert.ToByte(b));
+        }
+    }
+}

src/Ryujinx.Input.SDL2/SDL2Gamepad.cs

@@ -1,6 +1,8 @@
 using Ryujinx.Common.Configuration.Hid;
 using Ryujinx.Common.Configuration.Hid.Controller;
 using Ryujinx.Common.Logging;
+using Ryujinx.Common.Utilities;
+using Ryujinx.HLE.HOS.Services.Hid;
 using SDL2;
 using System;
 using System.Collections.Generic;
@@ -86,7 +88,7 @@ public SDL2Gamepad(nint gamepadHandle, string driverId)
             Id = driverId;
             Features = GetFeaturesFlag();
             _triggerThreshold = 0.0f;
-
+            
             // Enable motion tracking
             if (Features.HasFlag(GamepadFeaturesFlag.Motion))
             {
@@ -102,6 +104,18 @@ public SDL2Gamepad(nint gamepadHandle, string driverId)
             }
         }
 
+        public void SetLed(uint packedRgb)
+        {
+            if (!Features.HasFlag(GamepadFeaturesFlag.Led)) return;
+
+            byte red = packedRgb > 0 ? (byte)(packedRgb >> 16) : (byte)0;
+            byte green = packedRgb > 0 ? (byte)(packedRgb >> 8) : (byte)0;
+            byte blue = packedRgb > 0 ? (byte)(packedRgb % 256) : (byte)0;
+
+            if (SDL_GameControllerSetLED(_gamepadHandle, red, green, blue) != 0)
+                Logger.Error?.Print(LogClass.Hid, "LED is not supported on this game controller.");
+        }
+
         private GamepadFeaturesFlag GetFeaturesFlag()
         {
             GamepadFeaturesFlag result = GamepadFeaturesFlag.None;
@@ -112,9 +126,7 @@ private GamepadFeaturesFlag GetFeaturesFlag()
                 result |= GamepadFeaturesFlag.Motion;
             }
 
-            int error = SDL_GameControllerRumble(_gamepadHandle, 0, 0, 100);
-
-            if (error == 0)
+            if (SDL_GameControllerHasRumble(_gamepadHandle) == SDL_bool.SDL_TRUE)
             {
                 result |= GamepadFeaturesFlag.Rumble;
             }
@@ -220,6 +232,17 @@ public void SetConfiguration(InputConfig configuration)
             {
                 _configuration = (StandardControllerInputConfig)configuration;
 
+                if (Features.HasFlag(GamepadFeaturesFlag.Led) && _configuration.Led.EnableLed)
+                {
+                    if (_configuration.Led.TurnOffLed)
+                        (this as IGamepad).ClearLed();
+                    else if (_configuration.Led.UseRainbow)
+                        Rainbow.RainbowColorUpdated += clr => SetLed((uint)clr);
+                    else
+                        SetLed(_configuration.Led.LedColor);
+
+                }
+
                 _buttonsUserMapping.Clear();
 
                 // First update sticks

src/Ryujinx.Input.SDL2/SDL2GamepadDriver.cs

@@ -173,5 +173,16 @@ public IGamepad GetGamepad(string id)
 
             return new SDL2Gamepad(gamepadHandle, id);
         }
+
+        public IEnumerable<IGamepad> GetGamepads()
+        {
+            lock (_gamepadsIds)
+            {
+                foreach (string gamepadId in _gamepadsIds)
+                {
+                    yield return GetGamepad(gamepadId);
+                }
+            }
+        }
     }
 }

src/Ryujinx.Input.SDL2/SDL2Keyboard.cs

@@ -1,5 +1,6 @@
 using Ryujinx.Common.Configuration.Hid;
 using Ryujinx.Common.Configuration.Hid.Keyboard;
+using Ryujinx.Common.Logging;
 using System;
 using System.Collections.Generic;
 using System.Numerics;
@@ -385,6 +386,11 @@ public void SetConfiguration(InputConfig configuration)
             }
         }
 
+        public void SetLed(uint packedRgb)
+        {
+            Logger.Info?.Print(LogClass.UI, "SetLed called on an SDL2Keyboard");
+        }
+
         public void SetTriggerThreshold(float triggerThreshold)
         {
             // No operations

src/Ryujinx.Input.SDL2/SDL2Mouse.cs

@@ -1,4 +1,5 @@
 using Ryujinx.Common.Configuration.Hid;
+using Ryujinx.Common.Logging;
 using System;
 using System.Drawing;
 using System.Numerics;
@@ -76,6 +77,11 @@ public void SetConfiguration(InputConfig configuration)
             throw new NotImplementedException();
         }
 
+        public void SetLed(uint packedRgb)
+        {
+            Logger.Info?.Print(LogClass.UI, "SetLed called on an SDL2Mouse");
+        }
+
         public void SetTriggerThreshold(float triggerThreshold)
         {
             throw new NotImplementedException();

src/Ryujinx.Input.SDL2/SDL2MouseDriver.cs

@@ -1,6 +1,7 @@
 using Ryujinx.Common.Configuration;
 using Ryujinx.Common.Logging;
 using System;
+using System.Collections.Generic;
 using System.Diagnostics;
 using System.Drawing;
 using System.Numerics;
@@ -164,6 +165,8 @@ public IGamepad GetGamepad(string id)
             return new SDL2Mouse(this);
         }
 
+        public IEnumerable<IGamepad> GetGamepads() => [GetGamepad("0")];
+
         public void Dispose()
         {
             if (_isDisposed)

src/Ryujinx.Input.SDL2/SDLKeyboardDriver.cs

@@ -1,5 +1,6 @@
 using Ryujinx.SDL2.Common;
 using System;
+using System.Collections.Generic;
 
 namespace Ryujinx.Input.SDL2
 {
@@ -51,5 +52,13 @@ public IGamepad GetGamepad(string id)
 
             return new SDL2Keyboard(this, _keyboardIdentifers[0], "All keyboards");
         }
+
+        public IEnumerable<IGamepad> GetGamepads()
+        {
+            foreach (var keyboardId in _keyboardIdentifers)
+            {
+                yield return GetGamepad(keyboardId);
+            }
+        }
     }
 }

src/Ryujinx.Input/IGamepad.cs

@@ -65,6 +65,15 @@ public interface IGamepad : IDisposable
         /// <param name="configuration">The configuration of the gamepad</param>
         void SetConfiguration(InputConfig configuration);
 
+        /// <summary>
+        /// Set the LED on the gamepad to a given color.
+        /// </summary>
+        /// <remarks>Does nothing on a controller without LED functionality.</remarks>
+        /// <param name="packedRgb">The packed RGB integer.</param>
+        void SetLed(uint packedRgb);
+
+        public void ClearLed() => SetLed(0);
+
         /// <summary>
         /// Starts a rumble effect on the gamepad.
         /// </summary>

src/Ryujinx.Input/IGamepadDriver.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 
 namespace Ryujinx.Input
 {
@@ -33,6 +34,11 @@ public interface IGamepadDriver : IDisposable
         /// <param name="id">The unique id of the gamepad</param>
         /// <returns>An instance of <see cref="IGamepad"/> associated to the gamepad id given or null if not found</returns>
         IGamepad GetGamepad(string id);
+
+        /// <summary>
+        /// Returns an <see cref="IEnumerable{T}"/> of the connected gamepads.
+        /// </summary>
+        IEnumerable<IGamepad> GetGamepads();
 
         /// <summary>
         /// Clear the internal state of the driver.

src/Ryujinx.SDL2.Common/SDL2Driver.cs

@@ -1,5 +1,6 @@
 using Ryujinx.Common.Configuration;
 using Ryujinx.Common.Logging;
+using Ryujinx.Common.Utilities;
 using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
@@ -167,6 +168,8 @@ private void EventWorker()
                         HandleSDLEvent(ref evnt);
                     }
                 });
+
+                Rainbow.Tick();
 
                 waitHandle.Wait(WaitTimeMs);
             }

src/Ryujinx/AppHost.cs

@@ -587,6 +587,11 @@ private void Exit()
                 return;
             }
 
+            foreach (IGamepad gamepad in RyujinxApp.MainWindow.InputManager.GamepadDriver.GetGamepads())
+            {
+                gamepad?.ClearLed();
+            }
+
             _isStopped = true;
             Stop();
         }

src/Ryujinx/Assets/locales.json

@@ -7628,7 +7628,57 @@
         "ar_SA": "",
         "de_DE": "",
         "el_GR": "",
-        "en_US": "Custom LED",
+        "en_US": "LED",
+        "es_ES": "",
+        "fr_FR": "",
+        "he_IL": "",
+        "it_IT": "",
+        "ja_JP": "",
+        "ko_KR": "",
+        "no_NO": "",
+        "pl_PL": "",
+        "pt_BR": "",
+        "ru_RU": "",
+        "sv_SE": "",
+        "th_TH": "",
+        "tr_TR": "",
+        "uk_UA": "",
+        "zh_CN": "",
+        "zh_TW": ""
+      }
+    },
+    {
+      "ID": "ControllerSettingsLedColorDisable",
+      "Translations": {
+        "ar_SA": "",
+        "de_DE": "",
+        "el_GR": "",
+        "en_US": "Disable",
+        "es_ES": "",
+        "fr_FR": "",
+        "he_IL": "",
+        "it_IT": "",
+        "ja_JP": "",
+        "ko_KR": "",
+        "no_NO": "",
+        "pl_PL": "",
+        "pt_BR": "",
+        "ru_RU": "",
+        "sv_SE": "",
+        "th_TH": "",
+        "tr_TR": "",
+        "uk_UA": "",
+        "zh_CN": "",
+        "zh_TW": ""
+      }
+    },
+    {
+      "ID": "ControllerSettingsLedColorRainbow",
+      "Translations": {
+        "ar_SA": "",
+        "de_DE": "",
+        "el_GR": "",
+        "en_US": "Rainbow",
         "es_ES": "",
         "fr_FR": "",
         "he_IL": "",