Implement a "Pause Emulation" option & hotkey (#2428)

* Add a "Pause Emulation" option and hotkey

Closes Ryujinx#1604

* Refactoring how pause is handled

* Applied suggested changes from review

* Applied suggested fixes

* Pass correct suspend type to threads for suspend/resume

* Fix NRE after stoping emulation

* Removing SimulateWakeUpMessage call after resuming emulation

* Skip suspending non game process

* Pause the tickCounter in the ExecutionContext

* Refactoring tickCounter pause/resume as suggested

* Fix Config migration to add pause hotkey

* Fixed pausing only application threads

* Fix exiting emulator while paused

* Avoid pause/resume while already paused/resumed

* Cleanup unused code

* Avoid restarting audio if stopping emulation while in pause.

* Added suggested changes

* Fix ConfigurationState

6 files changed, 40 insertions, 1 deletions

diff --git a/Ryujinx.Audio/AudioManager.cs b/Ryujinx.Audio/AudioManager.cs
index ab25150a..84e5b4f7 100644
--- a/Ryujinx.Audio/AudioManager.cs
+++ b/Ryujinx.Audio/AudioManager.cs
@@ -45,6 +45,8 @@ namespace Ryujinx.Audio
         /// </summary>
         private Thread _workerThread;
 
+        private bool _isRunning;
+
         /// <summary>
         /// Create a new <see cref="AudioManager"/>.
         /// </summary>
@@ -52,6 +54,7 @@ namespace Ryujinx.Audio
         {
             _updateRequiredEvents = new ManualResetEvent[2];
             _actions = new Action[2];
+            _isRunning = false;
 
             // Termination event.
             _updateRequiredEvents[1] = new ManualResetEvent(false);
@@ -72,6 +75,7 @@ namespace Ryujinx.Audio
                 throw new InvalidOperationException();
             }
 
+            _isRunning = true;
             _workerThread.Start();
         }
 
@@ -96,7 +100,7 @@ namespace Ryujinx.Audio
         /// </summary>
         private void Update()
         {
-            while (true)
+            while (_isRunning)
             {
                 int index = WaitHandle.WaitAny(_updateRequiredEvents);
 
@@ -118,6 +122,14 @@ namespace Ryujinx.Audio
             }
         }
 
+        /// <summary>
+        /// Stop updating the <see cref="AudioManager"/> without stopping the worker thread.
+        /// </summary>
+        public void StopUpdates()
+        {
+            _isRunning = false;
+        }
+
         public void Dispose()
         {
             Dispose(true);
diff --git a/Ryujinx.Audio/Backends/CompatLayer/CompatLayerHardwareDeviceDriver.cs b/Ryujinx.Audio/Backends/CompatLayer/CompatLayerHardwareDeviceDriver.cs
index c0305f8a..0ae6a620 100644
--- a/Ryujinx.Audio/Backends/CompatLayer/CompatLayerHardwareDeviceDriver.cs
+++ b/Ryujinx.Audio/Backends/CompatLayer/CompatLayerHardwareDeviceDriver.cs
@@ -47,6 +47,11 @@ namespace Ryujinx.Audio.Backends.CompatLayer
             return _realDriver.GetUpdateRequiredEvent();
         }
 
+        public ManualResetEvent GetPauseEvent()
+        {
+            return _realDriver.GetPauseEvent();
+        }
+
         private uint SelectHardwareChannelCount(uint targetChannelCount)
         {
             if (_realDriver.SupportsChannelCount(targetChannelCount))
diff --git a/Ryujinx.Audio/Backends/Dummy/DummyHardwareDeviceDriver.cs b/Ryujinx.Audio/Backends/Dummy/DummyHardwareDeviceDriver.cs
index f24b359c..d729d3f6 100644
--- a/Ryujinx.Audio/Backends/Dummy/DummyHardwareDeviceDriver.cs
+++ b/Ryujinx.Audio/Backends/Dummy/DummyHardwareDeviceDriver.cs
@@ -27,10 +27,12 @@ namespace Ryujinx.Audio.Backends.Dummy
     public class DummyHardwareDeviceDriver : IHardwareDeviceDriver
     {
         private ManualResetEvent _updateRequiredEvent;
+        private ManualResetEvent _pauseEvent;
 
         public DummyHardwareDeviceDriver()
         {
             _updateRequiredEvent = new ManualResetEvent(false);
+            _pauseEvent = new ManualResetEvent(true);
         }
 
         public IHardwareDeviceSession OpenDeviceSession(Direction direction, IVirtualMemoryManager memoryManager, SampleFormat sampleFormat, uint sampleRate, uint channelCount)
@@ -60,6 +62,11 @@ namespace Ryujinx.Audio.Backends.Dummy
             return _updateRequiredEvent;
         }
 
+        public ManualResetEvent GetPauseEvent()
+        {
+            return _pauseEvent;
+        }
+
         public void Dispose()
         {
             Dispose(true);
@@ -70,6 +77,7 @@ namespace Ryujinx.Audio.Backends.Dummy
             if (disposing)
             {
                 // NOTE: The _updateRequiredEvent will be disposed somewhere else.
+                _pauseEvent.Dispose();
             }
         }
 
diff --git a/Ryujinx.Audio/Integration/IHardwareDeviceDriver.cs b/Ryujinx.Audio/Integration/IHardwareDeviceDriver.cs
index 70738c90..1a53fa9b 100644
--- a/Ryujinx.Audio/Integration/IHardwareDeviceDriver.cs
+++ b/Ryujinx.Audio/Integration/IHardwareDeviceDriver.cs
@@ -36,6 +36,7 @@ namespace Ryujinx.Audio.Integration
         IHardwareDeviceSession OpenDeviceSession(Direction direction, IVirtualMemoryManager memoryManager, SampleFormat sampleFormat, uint sampleRate, uint channelCount);
 
         ManualResetEvent GetUpdateRequiredEvent();
+        ManualResetEvent GetPauseEvent();
 
         bool SupportsDirection(Direction direction);
         bool SupportsSampleRate(uint sampleRate);
diff --git a/Ryujinx.Audio/Renderer/Dsp/AudioProcessor.cs b/Ryujinx.Audio/Renderer/Dsp/AudioProcessor.cs
index ea975056..e15165b9 100644
--- a/Ryujinx.Audio/Renderer/Dsp/AudioProcessor.cs
+++ b/Ryujinx.Audio/Renderer/Dsp/AudioProcessor.cs
@@ -55,6 +55,8 @@ namespace Ryujinx.Audio.Renderer.Dsp
         private long _playbackEnds;
         private ManualResetEvent _event;
 
+        private ManualResetEvent _pauseEvent;
+
         public AudioProcessor()
         {
             _event = new ManualResetEvent(false);
@@ -94,6 +96,7 @@ namespace Ryujinx.Audio.Renderer.Dsp
             _sessionCommandList = new RendererSession[Constants.AudioRendererSessionCountMax];
             _event.Reset();
             _lastTime = PerformanceCounter.ElapsedNanoseconds;
+            _pauseEvent = deviceDriver.GetPauseEvent();
 
             StartThread();
 
@@ -202,6 +205,8 @@ namespace Ryujinx.Audio.Renderer.Dsp
 
             while (true)
             {
+                _pauseEvent?.WaitOne();
+
                 MailboxMessage message = _mailbox.ReceiveMessage();
 
                 if (message == MailboxMessage.Stop)
diff --git a/Ryujinx.Audio/Renderer/Server/AudioRendererManager.cs b/Ryujinx.Audio/Renderer/Server/AudioRendererManager.cs
index 71d0f318..f471a2e7 100644
--- a/Ryujinx.Audio/Renderer/Server/AudioRendererManager.cs
+++ b/Ryujinx.Audio/Renderer/Server/AudioRendererManager.cs
@@ -215,6 +215,14 @@ namespace Ryujinx.Audio.Renderer.Server
         }
 
         /// <summary>
+        /// Stop sending commands to the <see cref="AudioProcessor"/> without stopping the worker thread.
+        /// </summary>
+        public void StopSendingCommands()
+        {
+            _isRunning = false;
+        }
+
+        /// <summary>
         /// Worker main function. This is used to dispatch audio renderer commands to the <see cref="AudioProcessor"/>.
         /// </summary>
         private void SendCommands()