mirror of
https://github.com/TomHarte/CLK.git
synced 2024-12-24 12:30:17 +00:00
132 lines
3.5 KiB
C++
132 lines
3.5 KiB
C++
//
|
|
// OPLL.hpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 03/05/2020.
|
|
// Copyright © 2020 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#ifndef OPLL_hpp
|
|
#define OPLL_hpp
|
|
|
|
#include "Implementation/OPLBase.hpp"
|
|
#include "Implementation/EnvelopeGenerator.hpp"
|
|
#include "Implementation/KeyLevelScaler.hpp"
|
|
#include "Implementation/PhaseGenerator.hpp"
|
|
#include "Implementation/LowFrequencyOscillator.hpp"
|
|
#include "Implementation/WaveformGenerator.hpp"
|
|
|
|
#include <atomic>
|
|
|
|
namespace Yamaha {
|
|
namespace OPL {
|
|
|
|
class OPLL: public OPLBase<OPLL> {
|
|
public:
|
|
/// Creates a new OPLL or VRC7.
|
|
OPLL(Concurrency::DeferringAsyncTaskQueue &task_queue, int audio_divider = 1, bool is_vrc7 = false);
|
|
|
|
/// As per ::SampleSource; provides audio output.
|
|
void get_samples(std::size_t number_of_samples, std::int16_t *target);
|
|
void set_sample_volume_range(std::int16_t range);
|
|
|
|
// The OPLL is generally 'half' as loud as it's told to be. This won't strictly be true in
|
|
// rhythm mode, but it's correct for melodic output.
|
|
double get_average_output_peak() const { return 0.5; }
|
|
|
|
/// Reads from the OPL.
|
|
uint8_t read(uint16_t address);
|
|
|
|
private:
|
|
friend OPLBase<OPLL>;
|
|
void write_register(uint8_t address, uint8_t value);
|
|
|
|
int audio_divider_ = 0;
|
|
int audio_offset_ = 0;
|
|
std::atomic<int> total_volume_;
|
|
|
|
int16_t output_levels_[18];
|
|
void update_all_channels();
|
|
|
|
int melodic_output(int channel);
|
|
int bass_drum();
|
|
int tom_tom();
|
|
int snare_drum();
|
|
int cymbal();
|
|
int high_hat();
|
|
|
|
static constexpr int period_precision = 9;
|
|
static constexpr int envelope_precision = 7;
|
|
|
|
// Standard melodic phase and envelope generators;
|
|
//
|
|
// These are assigned as:
|
|
//
|
|
// [x], 0 <= x < 9 = carrier for channel x;
|
|
// [x+9] = modulator for channel x.
|
|
//
|
|
PhaseGenerator<period_precision> phase_generators_[18];
|
|
EnvelopeGenerator<envelope_precision, period_precision> envelope_generators_[18];
|
|
KeyLevelScaler<period_precision> key_level_scalers_[18];
|
|
|
|
// Dedicated rhythm envelope generators and attenuations.
|
|
EnvelopeGenerator<envelope_precision, period_precision> rhythm_envelope_generators_[6];
|
|
enum RhythmIndices {
|
|
HighHat = 0,
|
|
Cymbal = 1,
|
|
TomTom = 2,
|
|
Snare = 3,
|
|
BassCarrier = 4,
|
|
BassModulator = 5
|
|
};
|
|
|
|
// Channel specifications.
|
|
struct Channel {
|
|
int octave = 0;
|
|
int period = 0;
|
|
int instrument = 0;
|
|
|
|
int attenuation = 0;
|
|
int modulator_attenuation = 0;
|
|
|
|
Waveform carrier_waveform = Waveform::Sine;
|
|
Waveform modulator_waveform = Waveform::Sine;
|
|
|
|
int carrier_key_rate_scale_multiplier = 0;
|
|
int modulator_key_rate_scale_multiplier = 0;
|
|
|
|
LogSign modulator_output;
|
|
int modulator_feedback = 0;
|
|
|
|
bool use_sustain = false;
|
|
} channels_[9];
|
|
|
|
// The low-frequency oscillator.
|
|
LowFrequencyOscillator oscillator_;
|
|
bool rhythm_mode_enabled_ = false;
|
|
bool is_vrc7_ = false;
|
|
|
|
// Contains the current configuration of the custom instrument.
|
|
uint8_t custom_instrument_[8] = {0, 0, 0, 0, 0, 0, 0, 0};
|
|
|
|
// Helpers to push per-channel information.
|
|
|
|
/// Pushes the current octave and period to channel @c channel.
|
|
void set_channel_period(int channel);
|
|
|
|
/// Installs the appropriate instrument on channel @c channel.
|
|
void install_instrument(int channel);
|
|
|
|
/// Sets whether the sustain level is used for channel @c channel based on its current instrument
|
|
/// and the user's selection.
|
|
void set_use_sustain(int channel);
|
|
|
|
/// @returns The 8-byte definition of instrument @c instrument.
|
|
const uint8_t *instrument_definition(int instrument, int channel);
|
|
};
|
|
|
|
}
|
|
}
|
|
|
|
#endif /* OPLL_hpp */
|