add SourceVoice.Apply3D

src/Audio/SourceVoice.cs

@@ -139,6 +139,41 @@ namespace MoonWorks.Audio
 			Submit(buffer.ToFAudioBuffer());
 		}
 
+		public unsafe void Apply3D(AudioListener listener, AudioEmitter emitter)
+		{
+			Is3D = true;
+
+			emitter.emitterData.CurveDistanceScaler = Device.CurveDistanceScalar;
+			emitter.emitterData.ChannelCount = SourceChannelCount;
+
+			var dspSettings = new FAudio.F3DAUDIO_DSP_SETTINGS
+			{
+				DopplerFactor = DopplerFactor,
+				SrcChannelCount = SourceChannelCount,
+				DstChannelCount = DestinationChannelCount,
+				pMatrixCoefficients = (nint) pMatrixCoefficients
+			};
+
+			FAudio.F3DAudioCalculate(
+				Device.Handle3D,
+				ref listener.listenerData,
+				ref emitter.emitterData,
+				FAudio.F3DAUDIO_CALCULATE_MATRIX | FAudio.F3DAUDIO_CALCULATE_DOPPLER,
+				ref dspSettings
+			);
+
+			UpdatePitch();
+
+			FAudio.FAudioVoice_SetOutputMatrix(
+				Handle,
+				OutputVoice.Handle,
+				SourceChannelCount,
+				DestinationChannelCount,
+				(nint) pMatrixCoefficients,
+				0
+			);
+		}
+
 		/// <summary>
 		/// Specifies that this source voice can be returned to the voice pool.
 		/// Holding on to the reference after calling this will cause problems!

src/Audio/Voice.cs

@@ -12,10 +12,10 @@ namespace MoonWorks.Audio
 		public uint SourceChannelCount { get; }
 		public uint DestinationChannelCount { get; }
 
-		private SubmixVoice OutputVoice;
+		protected SubmixVoice OutputVoice;
 		private ReverbEffect ReverbEffect;
 
-		byte* pMatrixCoefficients;
+		protected byte* pMatrixCoefficients;
 
 		public bool Is3D { get; protected set; }
 
@@ -447,7 +447,7 @@ namespace MoonWorks.Audio
 			SetOutputVoice(Device.MasteringVoice);
 		}
 
-		private void UpdatePitch()
+		protected void UpdatePitch()
 		{
 			float doppler;
 			float dopplerScale = Device.DopplerScale;