public override void Release()
{
if (State < ADSRState.Releasing)
{
if (adsr.R == 0)
{
curVelocity = 0;
Stop();
}
else if (curVelocity == 0 && prevVelocity == 0)
{
Stop();
}
else
{
nextState = ADSRState.Releasing;
}
}
}
public void Clock()
{
if ((waveform & 0x1) != 0)
{
if (state == ADSRState.Release)
{
state = ADSRState.Attack;
}
}
else
{
state = ADSRState.Release;
}
++adsrCounter;
adsrCounter &= 0x7fff;
ushort adsrTarget = 9;
switch (state)
{
case ADSRState.Attack:
adsrTarget = adsrRateTable[ad >> 4];
if (adsrCounter == adsrTarget)
{
adsrCounter = 0;
adsrExpCounter = 0;
++volumeLevel;
if (volumeLevel == 0xff)
{
state = ADSRState.Decay;
}
}
break;
case ADSRState.Decay:
adsrTarget = adsrRateTable[ad & 0xf];
if (adsrCounter == adsrTarget)
{
adsrCounter = 0;
byte adsrExpTarget = volumeLevel < 0x5d ? expTargetTable[volumeLevel] : (byte)1;
++adsrExpCounter;
if (adsrExpCounter >= adsrExpTarget)
{
adsrExpCounter = 0;
if (volumeLevel > sustainLevels[sr >> 4])
{
--volumeLevel;
}
}
}
break;
case ADSRState.Release:
adsrTarget = adsrRateTable[sr & 0xf];
if (adsrCounter == adsrTarget)
{
adsrCounter = 0;
if (volumeLevel > 0)
{
byte adsrExpTarget = volumeLevel < 0x5d ? expTargetTable[volumeLevel] : (byte)1;
++adsrExpCounter;
if (adsrExpCounter >= adsrExpTarget)
{
adsrExpCounter = 0;
--volumeLevel;
}
}
}
break;
}
uint lastAccumulator = accumulator;
accumulator += frequency;
accumulator &= 0xffffff;
if ((waveform & 0x8) != 0)
{
accumulator = 0;
//noiseGenerator = 0x7ffff8;
}
// Optimization: run noise generator only when necessary
if ((waveform & 0x80) != 0)
{
if ((lastAccumulator & 0x80000) == 0 && (accumulator & 0x80000) != 0)
{
uint temp = noiseGenerator;
uint step = (temp & 0x400000) ^ ((temp & 0x20000) << 5);
temp <<= 1;
if (step > 0)
{
temp |= 1;
}
noiseGenerator = temp & 0x7fffff;
}
}
doSync = ((lastAccumulator & 0x800000) == 0 && (accumulator & 0x800000) != 0);
}
protected void StepEnvelope()
{
void dec()
{
prevVelocity = curVelocity;
processStep = 0;
if (curVelocity - 1 <= sustainVelocity)
{
curVelocity = sustainVelocity;
nextState = ADSRState.Playing;
}
else
{
curVelocity = (byte)(curVelocity - 1).Clamp(0, 0xF);
}
}
void sus()
{
prevVelocity = curVelocity;
processStep = 0;
}
void rel()
{
if (adsr.R == 0)
{
prevVelocity = 0;
curVelocity = 0;
Stop();
}
else
{
prevVelocity = curVelocity;
processStep = 0;
if (curVelocity - 1 <= 0)
{
nextState = ADSRState.Dying;
curVelocity = 0;
}
else
{
curVelocity--;
}
}
}
switch (State)
{
case ADSRState.Initializing:
nextState = ADSRState.Rising;
prevPan = curPan;
processStep = 0;
if ((adsr.A | adsr.D) == 0 || (sustainVelocity == 0 && peakVelocity == 0))
{
State = ADSRState.Playing;
prevVelocity = sustainVelocity;
curVelocity = sustainVelocity;
return;
}
else if (adsr.A == 0 && adsr.S < 0xF)
{
State = ADSRState.Decaying;
prevVelocity = peakVelocity;
curVelocity = (byte)(peakVelocity - 1).Clamp(0, 0xF);
if (curVelocity < sustainVelocity)
{
curVelocity = sustainVelocity;
}
return;
}
else if (adsr.A == 0)
{
State = ADSRState.Playing;
prevVelocity = sustainVelocity;
curVelocity = sustainVelocity;
return;
}
else
{
State = ADSRState.Rising;
prevVelocity = 0;
curVelocity = 1;
return;
}
case ADSRState.Rising:
if (++processStep >= Config.Instance.InterFrames * adsr.A)
{
if (nextState == ADSRState.Decaying)
{
State = ADSRState.Decaying;
dec(); return;
}
if (nextState == ADSRState.Playing)
{
State = ADSRState.Playing;
sus(); return;
}
if (nextState == ADSRState.Releasing)
{
State = ADSRState.Releasing;
rel(); return;
}
prevVelocity = curVelocity;
processStep = 0;
if (++curVelocity >= peakVelocity)
{
if (adsr.D == 0)
{
nextState = ADSRState.Playing;
}
else if (peakVelocity == sustainVelocity)
{
nextState = ADSRState.Playing;
curVelocity = peakVelocity;
}
else
{
curVelocity = peakVelocity;
nextState = ADSRState.Decaying;
}
}
}
break;
case ADSRState.Decaying:
if (++processStep >= Config.Instance.InterFrames * adsr.D)
{
if (nextState == ADSRState.Playing)
{
State = ADSRState.Playing;
sus(); return;
}
if (nextState == ADSRState.Releasing)
{
State = ADSRState.Releasing;
rel(); return;
}
dec();
}
break;
case ADSRState.Playing:
if (++processStep >= Config.Instance.InterFrames)
{
if (nextState == ADSRState.Releasing)
{
State = ADSRState.Releasing;
rel(); return;
}
sus();
}
break;
case ADSRState.Releasing:
if (++processStep >= Config.Instance.InterFrames * adsr.R)
{
if (nextState == ADSRState.Dying)
{
Stop();
return;
}
rel();
}
break;
}
}
