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106 lines
3.1 KiB
C++
106 lines
3.1 KiB
C++
//
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// Sound.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 04/11/2020.
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// Copyright © 2020 Thomas Harte. All rights reserved.
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//
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#pragma once
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#include <atomic>
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#include "../../../ClockReceiver/ClockReceiver.hpp"
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#include "../../../Concurrency/AsyncTaskQueue.hpp"
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#include "../../../Outputs/Speaker/Implementation/BufferSource.hpp"
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namespace Apple::IIgs::Sound {
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class GLU: public Outputs::Speaker::BufferSource<GLU, false> { // TODO: isn't this stereo?
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public:
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GLU(Concurrency::AsyncTaskQueue<false> &audio_queue);
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void set_control(uint8_t);
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uint8_t get_control();
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void set_data(uint8_t);
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uint8_t get_data();
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void set_address_low(uint8_t);
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uint8_t get_address_low();
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void set_address_high(uint8_t);
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uint8_t get_address_high();
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void run_for(Cycles);
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Cycles next_sequence_point() const;
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bool get_interrupt_line();
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// SampleSource.
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template <Outputs::Speaker::Action action>
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void apply_samples(std::size_t number_of_samples, Outputs::Speaker::MonoSample *target);
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void set_sample_volume_range(std::int16_t range);
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private:
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Concurrency::AsyncTaskQueue<false> &audio_queue_;
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uint16_t address_ = 0;
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// Use a circular buffer for piping memory alterations onto the audio
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// thread; it would be prohibitive to defer every write individually.
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//
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// Assumed: on most modern architectures, an atomic 64-bit read or
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// write can be achieved locklessly.
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struct MemoryWrite {
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uint32_t time;
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uint16_t address;
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uint8_t value;
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bool enabled;
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};
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static_assert(sizeof(MemoryWrite) == 8);
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constexpr static int StoreBufferSize = 16384;
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std::atomic<MemoryWrite> pending_stores_[StoreBufferSize];
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uint32_t pending_store_read_ = 0, pending_store_read_time_ = 0;
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uint32_t pending_store_write_ = 0, pending_store_write_time_ = 0;
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// Maintain state both 'locally' (i.e. on the emulation thread) and
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// 'remotely' (i.e. on the audio thread).
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struct EnsoniqState {
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uint8_t ram_[65536];
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struct Oscillator {
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uint32_t position;
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// Programmer-set values.
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uint16_t velocity;
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uint8_t volume;
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uint8_t address;
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uint8_t control;
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uint8_t table_size;
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// Derived state.
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uint32_t overflow_mask; // If a non-zero bit gets anywhere into the overflow mask, this channel
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// has wrapped around. It's a function of table_size.
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bool interrupt_request = false; // Will be non-zero if this channel would request an interrupt, were
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// it currently enabled to do so.
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uint8_t sample(uint8_t *ram);
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int16_t output(uint8_t *ram);
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} oscillators[32];
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// Some of these aren't actually needed on both threads.
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uint8_t control = 0;
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int oscillator_count = 1;
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void set_register(uint16_t address, uint8_t value);
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} local_, remote_;
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// Functions to update an EnsoniqState; these don't belong to the state itself
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// because they also access the pending stores (inter alia).
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template <Outputs::Speaker::Action action>
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void generate_audio(size_t number_of_samples, Outputs::Speaker::MonoSample *target);
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void skip_audio(EnsoniqState &state, size_t number_of_samples);
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// Audio-thread state.
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int16_t output_range_ = 0;
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};
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}
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