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101 lines
2.7 KiB
C++
101 lines
2.7 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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/*!
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Provides an emulation of the OPL2 core, along with its OPLL and VRC7 specialisations.
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*/
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class OPL2: public ::Outputs::Speaker::SampleSource {
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public:
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enum class Personality {
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OPL2, // Provides full configuration of all channels.
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OPLL, // i.e. YM2413; uses the OPLL sound font, permitting full configuration of only a single channel.
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VRC7, // Uses the VRC7 sound font, permitting full configuration of only a single channel.
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};
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// Creates a new OPL2, OPLL or VRC7.
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OPL2(Personality personality, 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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/// Writes to the OPL.
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void write(uint16_t address, uint8_t value);
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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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Concurrency::DeferringAsyncTaskQueue &task_queue_;
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const Personality personality_;
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int exponential_[256];
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int log_sin_[256];
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uint8_t selected_register_ = 0;
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// Register write routines.
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void set_opl2_register(uint8_t location, uint8_t value);
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void set_opll_register(uint8_t location, uint8_t value);
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void set_opll_instrument(uint8_t target, uint8_t source, uint8_t volume);
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// Asynchronous properties, valid only on the audio thread.
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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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} operators_[18];
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struct Channel {
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int frequency;
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int octave;
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bool key_on;
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int feedback_strength;
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bool use_fm_synthesis;
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} channels_[9];
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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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// 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];
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uint8_t timer_control_;
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// OPLL-specific storage.
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uint8_t opll_custom_instrument_[8];
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uint8_t instrument_selections_[9];
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};
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}
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#endif /* OPL2_hpp */
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