1 files changed, 167 insertions, 0 deletions
diff --git a/src/Ryujinx.Audio.Backends.OpenAL/OpenALHardwareDeviceDriver.cs b/src/Ryujinx.Audio.Backends.OpenAL/OpenALHardwareDeviceDriver.cs
new file mode 100644
index 00000000..0c793f24
--- /dev/null
+++ b/src/Ryujinx.Audio.Backends.OpenAL/OpenALHardwareDeviceDriver.cs
@@ -0,0 +1,167 @@
+using OpenTK.Audio.OpenAL;
+using Ryujinx.Audio.Common;
+using Ryujinx.Audio.Integration;
+using Ryujinx.Memory;
+using System;
+using System.Collections.Concurrent;
+using System.Linq;
+using System.Threading;
+using static Ryujinx.Audio.Integration.IHardwareDeviceDriver;
+
+namespace Ryujinx.Audio.Backends.OpenAL
+{
+    public class OpenALHardwareDeviceDriver : IHardwareDeviceDriver
+    {
+        private readonly ALDevice _device;
+        private readonly ALContext _context;
+        private readonly ManualResetEvent _updateRequiredEvent;
+        private readonly ManualResetEvent _pauseEvent;
+        private readonly ConcurrentDictionary<OpenALHardwareDeviceSession, byte> _sessions;
+        private bool _stillRunning;
+        private Thread _updaterThread;
+
+        public OpenALHardwareDeviceDriver()
+        {
+            _device = ALC.OpenDevice("");
+            _context = ALC.CreateContext(_device, new ALContextAttributes());
+            _updateRequiredEvent = new ManualResetEvent(false);
+            _pauseEvent = new ManualResetEvent(true);
+            _sessions = new ConcurrentDictionary<OpenALHardwareDeviceSession, byte>();
+
+            _stillRunning = true;
+            _updaterThread = new Thread(Update)
+            {
+                Name = "HardwareDeviceDriver.OpenAL"
+            };
+
+            _updaterThread.Start();
+        }
+
+        public static bool IsSupported
+        {
+            get
+            {
+                try
+                {
+                    return ALC.GetStringList(GetEnumerationStringList.DeviceSpecifier).Any();
+                }
+                catch
+                {
+                    return false;
+                }
+            }
+        }
+
+        public IHardwareDeviceSession OpenDeviceSession(Direction direction, IVirtualMemoryManager memoryManager, SampleFormat sampleFormat, uint sampleRate, uint channelCount, float volume)
+        {
+            if (channelCount == 0)
+            {
+                channelCount = 2;
+            }
+
+            if (sampleRate == 0)
+            {
+                sampleRate = Constants.TargetSampleRate;
+            }
+
+            if (direction != Direction.Output)
+            {
+                throw new ArgumentException($"{direction}");
+            }
+            else if (!SupportsChannelCount(channelCount))
+            {
+                throw new ArgumentException($"{channelCount}");
+            }
+
+            OpenALHardwareDeviceSession session = new OpenALHardwareDeviceSession(this, memoryManager, sampleFormat, sampleRate, channelCount, volume);
+
+            _sessions.TryAdd(session, 0);
+
+            return session;
+        }
+
+        internal bool Unregister(OpenALHardwareDeviceSession session)
+        {
+            return _sessions.TryRemove(session, out _);
+        }
+
+        public ManualResetEvent GetUpdateRequiredEvent()
+        {
+            return _updateRequiredEvent;
+        }
+
+        public ManualResetEvent GetPauseEvent()
+        {
+            return _pauseEvent;
+        }
+
+        private void Update()
+        {
+            ALC.MakeContextCurrent(_context);
+
+            while (_stillRunning)
+            {
+                bool updateRequired = false;
+
+                foreach (OpenALHardwareDeviceSession session in _sessions.Keys)
+                {
+                    if (session.Update())
+                    {
+                        updateRequired = true;
+                    }
+                }
+
+                if (updateRequired)
+                {
+                    _updateRequiredEvent.Set();
+                }
+
+                // If it's not slept it will waste cycles.
+                Thread.Sleep(10);
+            }
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                _stillRunning = false;
+
+                foreach (OpenALHardwareDeviceSession session in _sessions.Keys)
+                {
+                    session.Dispose();
+                }
+
+                ALC.DestroyContext(_context);
+                ALC.CloseDevice(_device);
+
+                _pauseEvent.Dispose();
+            }
+        }
+
+        public bool SupportsSampleRate(uint sampleRate)
+        {
+            return true;
+        }
+
+        public bool SupportsSampleFormat(SampleFormat sampleFormat)
+        {
+            return true;
+        }
+
+        public bool SupportsChannelCount(uint channelCount)
+        {
+            return channelCount == 1 || channelCount == 2 || channelCount == 6;
+        }
+
+        public bool SupportsDirection(Direction direction)
+        {
+            return direction == Direction.Output;
+        }
+    }
+}