public void ProcessReverb3d(CommandList context, ref Reverb3dState state)
{
Debug.Assert(Parameter.IsChannelCountValid());
if (IsEffectEnabled && Parameter.IsChannelCountValid())
{
Span <IntPtr> inputBuffers = stackalloc IntPtr[Parameter.ChannelCount];
Span <IntPtr> outputBuffers = stackalloc IntPtr[Parameter.ChannelCount];
for (int i = 0; i < Parameter.ChannelCount; i++)
{
inputBuffers[i] = context.GetBufferPointer(InputBufferIndices[i]);
outputBuffers[i] = context.GetBufferPointer(OutputBufferIndices[i]);
}
switch (Parameter.ChannelCount)
{
case 1:
ProcessReverb3dMono(ref state, outputBuffers, inputBuffers, context.SampleCount);
break;
case 2:
ProcessReverb3dStereo(ref state, outputBuffers, inputBuffers, context.SampleCount);
break;
case 4:
ProcessReverb3dQuadraphonic(ref state, outputBuffers, inputBuffers, context.SampleCount);
break;
case 6:
ProcessReverb3dSurround(ref state, outputBuffers, inputBuffers, context.SampleCount);
break;
default:
throw new NotImplementedException(Parameter.ChannelCount.ToString());
}
}
else
{
for (int i = 0; i < Parameter.ChannelCount; i++)
{
if (InputBufferIndices[i] != OutputBufferIndices[i])
{
context.CopyBuffer(OutputBufferIndices[i], InputBufferIndices[i]);
}
}
}
}
private unsafe void ProcessReverb3dGeneric(ref Reverb3dState state, ReadOnlySpan <IntPtr> outputBuffers, ReadOnlySpan <IntPtr> inputBuffers, uint sampleCount, ReadOnlySpan <int> outputEarlyIndicesTable, ReadOnlySpan <int> targetEarlyDelayLineIndicesTable, ReadOnlySpan <int> targetOutputFeedbackIndicesTable)
{
const int delayLineSampleIndexOffset = 1;
bool isMono = Parameter.ChannelCount == 1;
bool isSurround = Parameter.ChannelCount == 6;
Span <float> outputValues = stackalloc float[Constants.ChannelCountMax];
Span <float> channelInput = stackalloc float[Parameter.ChannelCount];
Span <float> feedbackValues = stackalloc float[4];
Span <float> feedbackOutputValues = stackalloc float[4];
Span <float> values = stackalloc float[4];
for (int sampleIndex = 0; sampleIndex < sampleCount; sampleIndex++)
{
outputValues.Fill(0);
float tapOut = state.PreDelayLine.TapUnsafe(state.ReflectionDelayTime, delayLineSampleIndexOffset);
for (int i = 0; i < targetEarlyDelayLineIndicesTable.Length; i++)
{
int earlyDelayIndex = targetEarlyDelayLineIndicesTable[i];
int outputIndex = outputEarlyIndicesTable[i];
float tempTapOut = state.PreDelayLine.TapUnsafe(state.EarlyDelayTime[earlyDelayIndex], delayLineSampleIndexOffset);
outputValues[outputIndex] += tempTapOut * state.EarlyGain[earlyDelayIndex];
}
float targetPreDelayValue = 0;
for (int channelIndex = 0; channelIndex < Parameter.ChannelCount; channelIndex++)
{
channelInput[channelIndex] = *((float *)inputBuffers[channelIndex] + sampleIndex);
targetPreDelayValue += channelInput[channelIndex];
}
for (int i = 0; i < Parameter.ChannelCount; i++)
{
outputValues[i] *= state.EarlyReflectionsGain;
}
state.PreviousPreDelayValue = (targetPreDelayValue * state.TargetPreDelayGain) + (state.PreviousPreDelayValue * state.PreviousPreDelayGain);
state.PreDelayLine.Update(state.PreviousPreDelayValue);
for (int i = 0; i < state.FdnDelayLines.Length; i++)
{
float fdnValue = state.FdnDelayLines[i].Read();
float feedbackOutputValue = fdnValue * state.DecayDirectFdnGain[i] + state.PreviousFeedbackOutputDecayed[i];
state.PreviousFeedbackOutputDecayed[i] = (fdnValue * state.DecayCurrentFdnGain[i]) + (feedbackOutputValue * state.DecayCurrentOutputGain[i]);
feedbackOutputValues[i] = feedbackOutputValue;
}
feedbackValues[0] = feedbackOutputValues[2] + feedbackOutputValues[1];
feedbackValues[1] = -feedbackOutputValues[0] - feedbackOutputValues[3];
feedbackValues[2] = feedbackOutputValues[0] - feedbackOutputValues[3];
feedbackValues[3] = feedbackOutputValues[1] - feedbackOutputValues[2];
for (int i = 0; i < state.DecayDelays1.Length; i++)
{
float temp = state.DecayDelays1[i].Update(tapOut * state.LateReverbGain + feedbackValues[i]);
values[i] = state.DecayDelays2[i].Update(temp);
state.FdnDelayLines[i].Update(values[i]);
}
for (int channelIndex = 0; channelIndex < targetOutputFeedbackIndicesTable.Length; channelIndex++)
{
int targetOutputFeedbackIndex = targetOutputFeedbackIndicesTable[channelIndex];
if (targetOutputFeedbackIndex >= 0)
{
*((float *)outputBuffers[channelIndex] + sampleIndex) = (outputValues[channelIndex] + values[targetOutputFeedbackIndex] + channelInput[channelIndex] * state.DryGain);
}
}
if (isMono)
{
*((float *)outputBuffers[0] + sampleIndex) += values[1];
}
if (isSurround)
{
*((float *)outputBuffers[4] + sampleIndex) += (outputValues[4] + state.FrontCenterDelayLine.Update((values[2] - values[3]) * 0.5f) + channelInput[4] * state.DryGain);
}
}
}
private void ProcessReverb3dSurround(ref Reverb3dState state, ReadOnlySpan <IntPtr> outputBuffers, ReadOnlySpan <IntPtr> inputBuffers, uint sampleCount)
{
ProcessReverb3dGeneric(ref state, outputBuffers, inputBuffers, sampleCount, OutputEarlyIndicesTableSurround, TargetEarlyDelayLineIndicesTableSurround, TargetOutputFeedbackIndicesTableSurround);
}
