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With some fixes for scale, I think possibly this is close for melodic channels.
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@ -403,10 +403,14 @@ void Operator::update(OperatorState &state, bool key_on, int channel_period, int
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};
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// Update the raw phase.
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// TODO: if this is the real formula (i.e. a downward shift for channel_octave), this is a highly
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// suboptimal way to do this. Could just keep one accumulator and shift that downward for the result.
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const int octave_divider = 2048 >> channel_octave;
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state.divider_ %= octave_divider;
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state.divider_ += multipliers[frequency_multiple] * channel_period;
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state.raw_phase_ += state.divider_ / octave_divider;
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state.divider_ += channel_period;
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state.raw_phase_ += multipliers[frequency_multiple] * (state.divider_ / octave_divider);
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// TODO: this last step introduces aliasing, but is a quick way to verify whether the multiplier should
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// be applied also to the octave.
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// Hence calculate phase (TODO: by also taking account of vibrato).
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constexpr int waveforms[4][4] = {
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@ -512,9 +516,9 @@ void Operator::update(OperatorState &state, bool key_on, int channel_period, int
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// Combine the ADSR attenuation and overall channel attenuation, clamping to the permitted range.
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if(overrides) {
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state.attenuation = state.adsr_attenuation_ + (overrides->attenuation << 6);
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state.attenuation = state.adsr_attenuation_ + (overrides->attenuation << 4);
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} else {
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state.attenuation = state.adsr_attenuation_ + (attenuation_ << 3);
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state.attenuation = state.adsr_attenuation_ + (attenuation_ << 2);
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}
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}
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@ -92,7 +92,7 @@ class Operator {
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/// Sets this operator's waveform using the low two bits of @c value.
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void set_waveform(uint8_t value) {
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// waveform = Operator::Waveform(value & 3);
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waveform = Operator::Waveform(value & 3);
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}
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/// From the top nibble of @c value sets the AM, vibrato, hold/sustain level and keyboard sampling rate flags;
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@ -204,7 +204,7 @@ class Channel {
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// TODO: almost everything. This is a quick test.
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// Specifically: use lookup tables.
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const auto modulator_level = 0.0f;//level(modulator_state_, 0.0f) * 0.25f;
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const auto modulator_level = level(modulator_state_, 0.0f); // TODO: what's the proper scaling on this?
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return int(level(carrier_state_, modulator_level) * 20'000.0f);
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}
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@ -218,7 +218,9 @@ class Channel {
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const float phase = modulator_level + float(state.phase) / 1024.0f;
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const float phase_attenuation = logf(1.0f + sinf(float(M_PI) * 2.0f * phase));
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const float total_attenuation = phase_attenuation + float(state.attenuation) / 1023.0f;
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return expf(total_attenuation);
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const float result = expf(total_attenuation / 2.0f);
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return result;
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}
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/// 'F-Num' in the spec; this plus the current octave determines channel frequency.
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@ -334,10 +336,10 @@ struct OPLL: public OPLBase<OPLL> {
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int level = 0;
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};
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void update_all_chanels() {
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// for(int c = 0; c < 6; ++ c) { // Don't do anything with channels that might be percussion for now.
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// channels_[c].level = (channels_[c].update() * total_volume_) >> 14;
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// }
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channels_[0].level = (channels_[0].update() * total_volume_) >> 14;
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for(int c = 0; c < 6; ++ c) { // Don't do anything with channels that might be percussion for now.
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channels_[c].level = (channels_[c].update() * total_volume_) >> 14;
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}
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channels_[2].level = (channels_[2].update() * total_volume_) >> 14;
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}
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Channel channels_[9];
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