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63 lines
2.5 KiB
C++
63 lines
2.5 KiB
C++
//
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// Channel.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 15/04/2020.
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// Copyright © 2020 Thomas Harte. All rights reserved.
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//
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#include "Channel.hpp"
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using namespace Yamaha::OPL;
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void Channel::set_frequency_low(uint8_t value) {
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period_ = (period_ &~0xff) | value;
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}
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void Channel::set_10bit_frequency_octave_key_on(uint8_t value) {
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period_ = (period_ & 0xff) | ((value & 3) << 8);
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octave_ = (value >> 2) & 0x7;
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key_on_ = value & 0x20;
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frequency_shift_ = 0;
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}
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void Channel::set_9bit_frequency_octave_key_on(uint8_t value) {
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period_ = (period_ & 0xff) | ((value & 1) << 8);
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octave_ = (value >> 1) & 0x7;
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key_on_ = value & 0x10;;
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frequency_shift_ = 1;
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}
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void Channel::set_feedback_mode(uint8_t value) {
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feedback_strength_ = (value >> 1) & 0x7;
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use_fm_synthesis_ = value & 1;
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}
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int Channel::update_melodic(const LowFrequencyOscillator &oscillator, Operator *modulator, Operator *carrier, bool force_key_on, OperatorOverrides *modulator_overrides, OperatorOverrides *carrier_overrides) {
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modulator->update(modulator_state_, oscillator, key_on_ || force_key_on, period_ << frequency_shift_, octave_, modulator_overrides);
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carrier->update(carrier_state_, oscillator, key_on_ || force_key_on, period_ << frequency_shift_, octave_, carrier_overrides);
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if(use_fm_synthesis_) {
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// Get modulator level, use that as a phase-adjusting input to the carrier and then return the carrier level.
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const LogSign modulator_output = modulator->melodic_output(modulator_state_);
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return carrier->melodic_output(carrier_state_, &modulator_output).level();
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} else {
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// Get modulator and carrier levels separately, return their sum.
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return (carrier->melodic_output(carrier_state_).level() + modulator->melodic_output(carrier_state_).level()) >> 1;
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}
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}
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int Channel::update_tom_tom(const LowFrequencyOscillator &oscillator, Operator *modulator, bool force_key_on, OperatorOverrides *modulator_overrides) {
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modulator->update(modulator_state_, oscillator, key_on_ || force_key_on, period_ << frequency_shift_, octave_, modulator_overrides);
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return modulator->melodic_output(modulator_state_).level();
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}
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int Channel::update_snare(const LowFrequencyOscillator &oscillator, Operator *carrier, bool force_key_on, OperatorOverrides *carrier_overrides) {
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carrier->update(carrier_state_, oscillator, key_on_ || force_key_on, period_ << frequency_shift_, octave_, carrier_overrides);
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return carrier->snare_output(modulator_state_).level();
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}
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bool Channel::is_audible(Operator *carrier, OperatorOverrides *carrier_overrides) {
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return carrier->is_audible(carrier_state_, carrier_overrides);
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}
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