private void WriteBlock(float previousGain, float currentGain, float[] source, float[] destination)
{
if (Math.Max(previousGain, currentGain) < SoundFontMath.NonAudible)
{
return;
}
if (MathF.Abs(currentGain - previousGain) < 1.0E-3)
{
ArrayMath.MultiplyAdd(currentGain, source, destination);
}
else
{
var step = inverseBlockSize * (currentGain - previousGain);
ArrayMath.MultiplyAdd(previousGain, step, source, destination);
}
}
private void RenderBlock()
{
voices.Process();
Array.Clear(blockLeft, 0, blockLeft.Length);
Array.Clear(blockRight, 0, blockRight.Length);
foreach (var voice in voices)
{
var previousGainLeft = masterVolume * voice.PreviousMixGainLeft;
var currentGainLeft = masterVolume * voice.CurrentMixGainLeft;
WriteBlock(previousGainLeft, currentGainLeft, voice.Block, blockLeft);
var previousGainRight = masterVolume * voice.PreviousMixGainRight;
var currentGainRight = masterVolume * voice.CurrentMixGainRight;
WriteBlock(previousGainRight, currentGainRight, voice.Block, blockRight);
}
if (enableReverbAndChorus)
{
Array.Clear(chorusInputLeft, 0, chorusInputLeft.Length);
Array.Clear(chorusInputRight, 0, chorusInputRight.Length);
foreach (var voice in voices)
{
var previousGainLeft = voice.PreviousChorusSend * voice.PreviousMixGainLeft;
var currentGainLeft = voice.CurrentChorusSend * voice.CurrentMixGainLeft;
WriteBlock(previousGainLeft, currentGainLeft, voice.Block, chorusInputLeft);
var previousGainRight = voice.PreviousChorusSend * voice.PreviousMixGainRight;
var currentGainRight = voice.CurrentChorusSend * voice.CurrentMixGainRight;
WriteBlock(previousGainRight, currentGainRight, voice.Block, chorusInputRight);
}
chorus.Process(chorusInputLeft, chorusInputRight, chorusOutputLeft, chorusOutputRight);
ArrayMath.MultiplyAdd(masterVolume, chorusOutputLeft, blockLeft);
ArrayMath.MultiplyAdd(masterVolume, chorusOutputRight, blockRight);
Array.Clear(reverbInput, 0, reverbInput.Length);
foreach (var voice in voices)
{
var previousGain = reverb.InputGain * voice.PreviousReverbSend * (voice.PreviousMixGainLeft + voice.PreviousMixGainRight);
var currentGain = reverb.InputGain * voice.CurrentReverbSend * (voice.CurrentMixGainLeft + voice.CurrentMixGainRight);
WriteBlock(previousGain, currentGain, voice.Block, reverbInput);
}
reverb.Process(reverbInput, reverbOutputLeft, reverbOutputRight);
ArrayMath.MultiplyAdd(masterVolume, reverbOutputLeft, blockLeft);
ArrayMath.MultiplyAdd(masterVolume, reverbOutputRight, blockRight);
}
}
