void TVA::recalcSustain() {
// We get pinged periodically by the pitch code to recalculate our values when in sustain.
// This is done so that the TVA will respond to things like MIDI expression and volume changes while it's sustaining, which it otherwise wouldn't do.
// The check for envLevel[3] == 0 strikes me as slightly dumb. FIXME: Explain why
if (phase != TVA_PHASE_SUSTAIN || partialParam->tva.envLevel[3] == 0) {
return;
}
// We're sustaining. Recalculate all the values
const Tables *tables = &Tables::getInstance();
int newTarget = calcBasicAmp(tables, partial, system, partialParam, patchTemp, rhythmTemp, biasAmpSubtraction, veloAmpSubtraction, part->getExpression());
newTarget += partialParam->tva.envLevel[3];
// Since we're in TVA_PHASE_SUSTAIN at this point, we know that target has been reached and an interrupt fired, so we can rely on it being the current amp.
int targetDelta = newTarget - target;
// Calculate an increment to get to the new amp value in a short, more or less consistent amount of time
Bit8u newIncrement;
if (targetDelta >= 0) {
newIncrement = tables->envLogarithmicTime[(Bit8u)targetDelta] - 2;
} else {
newIncrement = (tables->envLogarithmicTime[(Bit8u)-targetDelta] - 2) | 0x80;
}
// Configure so that once the transition's complete and nextPhase() is called, we'll just re-enter sustain phase (or decay phase, depending on parameters at the time).
startRamp(newTarget, newIncrement, TVA_PHASE_SUSTAIN - 1);
}
void ParameterRamper::dezipperCheck(uint32_t rampDuration)
{
// check to see if the UI has changed and if so, start a ramp to dezipper it.
int32_t changeCounterSnapshot = data->changeCounter;
if (data->updateCounter != changeCounterSnapshot) {
data->updateCounter = changeCounterSnapshot;
startRamp(data->uiValue, rampDuration);
}
}
void TVA::startDecay() {
if (phase >= TVA_PHASE_RELEASE) {
return;
}
Bit8u newIncrement;
if (partialParam->tva.envTime[4] == 0) {
newIncrement = 1;
} else {
newIncrement = -partialParam->tva.envTime[4];
}
// The next time nextPhase() is called, it will think TVA_PHASE_RELEASE has finished and the partial will be aborted
startRamp(0, newIncrement, TVA_PHASE_RELEASE);
}
void TVA::reset(const Part *newPart, const TimbreParam::PartialParam *newPartialParam, const MemParams::RhythmTemp *newRhythmTemp) {
part = newPart;
partialParam = newPartialParam;
patchTemp = newPart->getPatchTemp();
rhythmTemp = newRhythmTemp;
playing = true;
const Tables *tables = &Tables::getInstance();
int key = partial->getPoly()->getKey();
int velocity = partial->getPoly()->getVelocity();
keyTimeSubtraction = calcKeyTimeSubtraction(partialParam->tva.envTimeKeyfollow, key);
biasAmpSubtraction = calcBiasAmpSubtractions(partialParam, key);
veloAmpSubtraction = calcVeloAmpSubtraction(partialParam->tva.veloSensitivity, velocity);
int newTarget = calcBasicAmp(tables, partial, system, partialParam, patchTemp, newRhythmTemp, biasAmpSubtraction, veloAmpSubtraction, part->getExpression());
int newPhase;
if (partialParam->tva.envTime[0] == 0) {
// Initially go to the TVA_PHASE_ATTACK target amp, and spend the next phase going from there to the TVA_PHASE_2 target amp
// Note that this means that velocity never affects time for this partial.
newTarget += partialParam->tva.envLevel[0];
newPhase = TVA_PHASE_ATTACK; // The first target used in nextPhase() will be TVA_PHASE_2
} else {
// Initially go to the base amp determined by TVA level, part volume, etc., and spend the next phase going from there to the full TVA_PHASE_ATTACK target amp.
newPhase = TVA_PHASE_BASIC; // The first target used in nextPhase() will be TVA_PHASE_ATTACK
}
ampRamp->reset();//currentAmp = 0;
// "Go downward as quickly as possible".
// Since the current value is 0, the LA32Ramp will notice that we're already at or below the target and trying to go downward,
// and therefore jump to the target immediately and raise an interrupt.
startRamp((Bit8u)newTarget, 0x80 | 127, newPhase);
}
void TVA::recalcSustain() {
// We get pinged periodically by the pitch code to recalculate our values when in sustain.
// This is done so that the TVA will respond to things like MIDI expression and volume changes while it's sustaining, which it otherwise wouldn't do.
// The check for envLevel[3] == 0 strikes me as slightly dumb. FIXME: Explain why
if (phase != TVA_PHASE_SUSTAIN || partialParam->tva.envLevel[3] == 0) {
return;
}
// We're sustaining. Recalculate all the values
const Tables *tables = &Tables::getInstance();
int newTarget = calcBasicAmp(tables, partial, system, partialParam, patchTemp, rhythmTemp, biasAmpSubtraction, veloAmpSubtraction, part->getExpression(), partial->getSynth()->controlROMFeatures->quirkRingModulationNoMix);
newTarget += partialParam->tva.envLevel[3];
// Although we're in TVA_PHASE_SUSTAIN at this point, we cannot be sure that there is no active ramp at the moment.
// In case the channel volume or the expression changes frequently, the previously started ramp may still be in progress.
// Real hardware units ignore this possibility and rely on the assumption that the target is the current amp.
// This is OK in most situations but when the ramp that is currently in progress needs to change direction
// due to a volume/expression update, this leads to a jump in the amp that is audible as an unpleasant click.
// To avoid that, we compare the newTarget with the the actual current ramp value and correct the direction if necessary.
int targetDelta = newTarget - target;
// Calculate an increment to get to the new amp value in a short, more or less consistent amount of time
Bit8u newIncrement;
bool descending = targetDelta < 0;
if (!descending) {
newIncrement = tables->envLogarithmicTime[Bit8u(targetDelta)] - 2;
} else {
newIncrement = (tables->envLogarithmicTime[Bit8u(-targetDelta)] - 2) | 0x80;
}
if (part->getSynth()->isNiceAmpRampEnabled() && (descending != ampRamp->isBelowCurrent(newTarget))) {
newIncrement ^= 0x80;
}
// Configure so that once the transition's complete and nextPhase() is called, we'll just re-enter sustain phase (or decay phase, depending on parameters at the time).
startRamp(newTarget, newIncrement, TVA_PHASE_SUSTAIN - 1);
}
void TVA::startAbort() {
startRamp(64, 0x80 | 127, TVA_PHASE_RELEASE);
}
