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Logic is: they have different mixers (additive in the OPL2, time-division multiplexing in the OPLL) as well as different register sets. So I'll put operator and channel logic directly into those structs.
131 lines
3.0 KiB
C++
131 lines
3.0 KiB
C++
//
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// OPL2.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 02/04/2020.
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// Copyright © 2020 Thomas Harte. All rights reserved.
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//
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#ifndef OPL2_hpp
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#define OPL2_hpp
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#include "../../Outputs/Speaker/Implementation/SampleSource.hpp"
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#include "../../Concurrency/AsyncTaskQueue.hpp"
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#include "../../Numeric/LFSR.hpp"
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namespace Yamaha {
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namespace OPL {
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struct Operator {
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bool apply_amplitude_modulation = false;
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bool apply_vibrato = false;
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bool hold_sustain_level = false;
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bool keyboard_scaling_rate = false;
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int frequency_multiple = 0;
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int scaling_level = 0;
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int output_level = 0;
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int attack_rate = 0;
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int decay_rate = 0;
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int sustain_level = 0;
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int release_rate = 0;
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int waveform = 0;
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};
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struct Channel {
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int frequency = 0;
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int octave = 0;
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bool key_on = false;
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int feedback_strength = 0;
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bool use_fm_synthesis = true;
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};
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template <typename Child> class OPLBase: public ::Outputs::Speaker::SampleSource {
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public:
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void write(uint16_t address, uint8_t value);
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protected:
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OPLBase(Concurrency::DeferringAsyncTaskQueue &task_queue);
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Concurrency::DeferringAsyncTaskQueue &task_queue_;
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int exponential_[256];
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int log_sin_[256];
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uint8_t depth_rhythm_control_;
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uint8_t csm_keyboard_split_;
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bool waveform_enable_;
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private:
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uint8_t selected_register_ = 0;
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};
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struct OPL2: public OPLBase<OPL2> {
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public:
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// Creates a new OPL2.
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OPL2(Concurrency::DeferringAsyncTaskQueue &task_queue);
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/// As per ::SampleSource; provides a broadphase test for silence.
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bool is_zero_level();
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/// As per ::SampleSource; provides audio output.
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void get_samples(std::size_t number_of_samples, std::int16_t *target);
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void set_sample_volume_range(std::int16_t range);
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/// Reads from the OPL.
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uint8_t read(uint16_t address);
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private:
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friend OPLBase<OPL2>;
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Operator operators_[18];
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Channel channels_[9];
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// This is the correct LSFR per forums.submarine.org.uk.
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Numeric::LFSR<uint32_t, 0x800302> noise_source_;
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// Synchronous properties, valid only on the emulation thread.
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uint8_t timers_[2] = {0, 0};
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uint8_t timer_control_ = 0;
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void write_register(uint8_t address, uint8_t value);
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};
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struct OPLL: public OPLBase<OPLL> {
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public:
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// Creates a new OPLL or VRC7.
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OPLL(Concurrency::DeferringAsyncTaskQueue &task_queue, bool is_vrc7 = false);
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/// As per ::SampleSource; provides a broadphase test for silence.
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bool is_zero_level();
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/// As per ::SampleSource; provides audio output.
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void get_samples(std::size_t number_of_samples, std::int16_t *target);
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void set_sample_volume_range(std::int16_t range);
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/// Reads from the OPL.
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uint8_t read(uint16_t address);
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private:
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friend OPLBase<OPLL>;
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Operator operators_[32];
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struct Channel: public ::Yamaha::OPL::Channel {
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int output_level = 0;
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bool hold_sustain_level = false;
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Operator *modulator; // Implicitly, the carrier is modulator+1.
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};
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Channel channels_[9];
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void setup_fixed_instrument(int number, const uint8_t *data);
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uint8_t custom_instrument_[8];
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void write_register(uint8_t address, uint8_t value);
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};
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}
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}
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#endif /* OPL2_hpp */
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