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Moves modulator updates a sample behind operator updates.

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This commit is contained in:
Thomas Harte 2020-05-08 21:14:25 -04:00
parent 668f4b77f3
commit 8f541602c1
1 changed files with 6 additions and 4 deletions
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8
Components/OPL2/OPLL.cpp
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@ -368,12 +368,16 @@ void OPLL::update_all_channels() {
#undef VOLUME
// TODO: batch updates of the LFSR.
// TODO: modulator feedback.
}
// TODO: verify attenuation scales pervasively below.
int OPLL::melodic_output(int channel) {
// The modulator always updates after the carrier, oddly enough. So calculate actual output first, based on the modulator's last value.
auto carrier = WaveformGenerator<period_precision>::wave(channels_[channel].carrier_waveform, phase_generators_[channel].scaled_phase(), channels_[channel].modulator_output);
carrier += envelope_generators_[channel].attenuation() + (channels_[channel].attenuation << 7) + key_level_scalers_[channel].attenuation();
// Get the modulator's new value.
auto modulation = WaveformGenerator<period_precision>::wave(channels_[channel].modulator_waveform, phase_generators_[channel + 9].phase());
modulation += envelope_generators_[channel + 9].attenuation() + (channels_[channel].modulator_attenuation << 5) + key_level_scalers_[channel + 9].attenuation();
@ -381,8 +385,6 @@ int OPLL::melodic_output(int channel) {
phase_generators_[channel + 9].apply_feedback(channels_[channel].modulator_output, modulation, channels_[channel].modulator_feedback);
channels_[channel].modulator_output = modulation;
auto carrier = WaveformGenerator<period_precision>::wave(channels_[channel].carrier_waveform, phase_generators_[channel].scaled_phase(), modulation);
carrier += envelope_generators_[channel].attenuation() + (channels_[channel].attenuation << 7) + key_level_scalers_[channel].attenuation();
return carrier.level();
}