Cleanup fixes

src/Audio/AudioDevice.cs

@@ -240,9 +240,10 @@ namespace MoonWorks.Audio
             {
                 if (disposing)
                 {
-                    // TODO: dispose managed state (managed objects)
-                    foreach (var weakReference in streamingSounds)
+					for (var i = streamingSounds.Count - 1; i >= 0; i--)
 					{
+						var weakReference = streamingSounds[i];
+
 						if (weakReference.TryGetTarget(out var streamingSound))
                         {
                             streamingSound.Dispose();
@@ -251,6 +252,8 @@ namespace MoonWorks.Audio
 					streamingSounds.Clear();
                 }
 
+				FAudio.FAudioVoice_DestroyVoice(ReverbVoice);
+				FAudio.FAudioVoice_DestroyVoice(MasteringVoice);
                 FAudio.FAudio_Release(Handle);
 
                 IsDisposed = true;

src/Game.cs

@@ -139,7 +139,13 @@ namespace MoonWorks
 				GraphicsDevice.SubmitDestroyCommandBuffer();
             }
 
+			OnDestroy();
+
+			AudioDevice.Dispose();
 			GraphicsDevice.Dispose();
+			Window.Dispose();
+
+			SDL.SDL_Quit();
         }
 
         private void HandleSDLEvents()
@@ -168,6 +174,9 @@ namespace MoonWorks
 		// alpha refers to a percentage value between the current and next state
         protected abstract void Draw(TimeSpan dt, double alpha);
 
+		// Clean up any objects you created in this function
+		protected abstract void OnDestroy();
+
         private void HandleTextInput(SDL2.SDL.SDL_Event evt)
         {
             // Based on the SDL2# LPUtf8StrMarshaler

src/Window/OSWindow.cs

@@ -3,11 +3,13 @@ using SDL2;
 
 namespace MoonWorks.Window
 {
-    public class OSWindow
+    public class OSWindow : IDisposable
     {
 		internal IntPtr Handle { get; }
         public ScreenMode ScreenMode { get; }
 
+		private bool IsDisposed;
+
         public OSWindow(WindowCreateInfo windowCreateInfo)
         {
             var windowFlags = SDL.SDL_WindowFlags.SDL_WINDOW_VULKAN;
@@ -59,5 +61,33 @@ namespace MoonWorks.Window
         {
             SDL.SDL_SetWindowSize(Handle, (int)width, (int)height);
         }
+
+		protected virtual void Dispose(bool disposing)
+		{
+			if (!IsDisposed)
+			{
+				if (disposing)
+				{
+					// dispose managed state (managed objects)
+				}
+
+				SDL.SDL_DestroyWindow(Handle);
+
+				IsDisposed = true;
+			}
+		}
+
+		~OSWindow()
+		{
+		    // Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
+		    Dispose(disposing: false);
+		}
+
+		public void Dispose()
+		{
+			// Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
+			Dispose(disposing: true);
+			GC.SuppressFinalize(this);
+		}
 	}
 }