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Add block version of the ADSR rework

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Jean Pierre Cimalando 2020-03-25 19:53:56 +01:00 • committed by Paul Fd
parent 77589f4109
commit fdda018a70
1 changed files with 77 additions and 2 deletions
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79
src/sfizz/ADSREnvelope.cpp
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@ -100,8 +100,83 @@ Type ADSREnvelope<Type>::getNextValue() noexcept
template <class Type>
void ADSREnvelope<Type>::getBlock(absl::Span<Type> output) noexcept
{
for (size_t i = 0, n = output.size(); i < n; ++i)
output[i] = getNextValue();
State currentState = this->currentState;
Type currentValue = this->currentValue;
while (!output.empty()) {
size_t count = 0;
size_t size = output.size();
switch (currentState) {
case State::Delay:
while (count < size && delay-- > 0) {
currentValue = start;
output[count++] = currentValue;
}
if (delay <= 0)
currentState = State::Attack;
break;
case State::Attack:
while (count < size && (currentValue += peak * attackStep) < peak)
output[count++] = currentValue;
if (currentValue >= peak) {
currentValue = peak;
currentState = State::Hold;
}
break;
case State::Hold:
while (count < size && hold-- > 0)
output[count++] = currentValue;
if (hold <= 0)
currentState = State::Decay;
break;
case State::Decay:
while (count < size && (currentValue *= decayRate) > sustain)
output[count++] = currentValue;
if (currentValue <= sustain) {
currentValue = sustain;
currentState = State::Sustain;
}
break;
case State::Sustain:
if (freeRunning)
shouldRelease = true;
if (!shouldRelease) {
count = size;
currentValue = sustain;
sfz::fill(output.first(count), currentValue);
}
else {
if (releaseDelay > 0) {
count = clamp<size_t>(releaseDelay, 0, size);
currentValue = sustain;
sfz::fill(output.first(count), currentValue);
releaseDelay -= count;
}
if (releaseDelay <= 0)
currentState = State::Release;
}
break;
case State::Release:
while (count < size && (currentValue *= releaseRate) > config::virtuallyZero)
output[count++] = currentValue;
if (currentValue <= config::virtuallyZero) {
currentValue = 0;
currentState = State::Done;
}
break;
default:
count = size;
currentValue = 0.0;
sfz::fill(output, currentValue);
break;
}
output.remove_prefix(count);
}
this->currentState = currentState;
this->currentValue = currentValue;
}
template <class Type>