Handheld Gyro

src/Ryujinx.Input.SDL3/Ryujinx.Input.SDL3.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Ryujinx.Input\Ryujinx.Input.csproj" />
+    <PackageReference Include="Alimer.Bindings.SDL" />
+  </ItemGroup>
+
+</Project>

src/Ryujinx.Input.SDL3/SDL3MotionDriver.cs

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+using SDL3;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Numerics;
+using static SDL3.SDL3;
+
+namespace Ryujinx.Input.SDL3
+{
+    public unsafe class SDL3MotionDriver : IHandheld, IDisposable
+    {
+        private readonly Dictionary<SDL_SensorType, SDL_Sensor> sensors;
+        private bool _disposed;
+
+        public SDL3MotionDriver()
+        {
+            int result = SDL_Init(SDL_InitFlags.Sensor);
+            if (result < 0)
+            {
+                throw new InvalidOperationException($"SDL sensor initialization failed: {SDL_GetError()}");
+            }
+            sensors = SDL_GetSensors().ToArray().ToDictionary(SDL_GetSensorTypeForID, SDL_OpenSensor);
+        }
+
+        ~SDL3MotionDriver()
+        {
+            Dispose(false);
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (_disposed)
+            {
+                return;
+            }
+
+            if (disposing && sensors != null)
+            {
+                foreach (var sensor in sensors.Values)
+                {
+                    if (sensor != IntPtr.Zero)
+                    {
+                        SDL_CloseSensor(sensor);
+                    }
+                }
+            }
+
+            _disposed = true;
+        }
+
+        public Vector3 GetMotionData(MotionInputId inputType)
+        {
+            ObjectDisposedException.ThrowIf(_disposed, this);
+
+            return inputType switch
+            {
+                MotionInputId.Gyroscope => GetSensorVector(SDL_SensorType.Gyro) * 180 / MathF.PI,
+                MotionInputId.Accelerometer => GetSensorVector(SDL_SensorType.Accel) / SDL_STANDARD_GRAVITY,
+                _ => Vector3.Zero
+            };
+        }
+
+        private Vector3 GetSensorVector(SDL_SensorType sensorType)
+        {
+            if (!sensors.TryGetValue(sensorType, out SDL_Sensor sensor))
+            {
+                return Vector3.Zero;
+            }
+
+            var data = stackalloc float[3];
+            if (SDL_GetSensorData(sensor, data, 3) < 0)
+            {
+                return Vector3.Zero;
+            }
+
+            return new Vector3(data[0], data[1], data[2]);
+        }
+    }
+}