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70 lines
1.6 KiB
C++
70 lines
1.6 KiB
C++
//
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// Dave.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 22/06/2021.
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// Copyright © 2021 Thomas Harte. All rights reserved.
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//
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#ifndef Dave_hpp
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#define Dave_hpp
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#include <cstdint>
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#include "../../Concurrency/AsyncTaskQueue.hpp"
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#include "../../Numeric/LFSR.hpp"
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#include "../../Outputs/Speaker/Implementation/SampleSource.hpp"
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namespace Enterprise {
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/*!
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Models a subset of Dave's behaviour; memory mapping and interrupt status
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is integrated into the main Enterprise machine.
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*/
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class Dave: public Outputs::Speaker::SampleSource {
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public:
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Dave(Concurrency::DeferringAsyncTaskQueue &audio_queue);
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void write(uint16_t address, uint8_t value);
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// MARK: - SampleSource.
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void set_sample_volume_range(int16_t range);
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static constexpr bool get_is_stereo() { return true; } // Dave produces stereo sound.
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void get_samples(std::size_t number_of_samples, int16_t *target);
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private:
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Concurrency::DeferringAsyncTaskQueue &audio_queue_;
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struct Channel {
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// User-set values.
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uint16_t reload = 0;
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bool high_pass = false;
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bool ring_modulate = false;
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enum class Distortion {
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None,
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FourBit,
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FiveBit,
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SevenBit,
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} distortion = Distortion::None;
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uint8_t amplitude[2]{};
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// Current state.
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uint16_t count = 0;
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bool output = true;
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} channels_[3];
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int16_t volume_ = 0;
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// Various polynomials that contribute to audio generation.
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Numeric::LFSRv<0xc> poly4_;
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Numeric::LFSRv<0x14> poly5_;
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Numeric::LFSRv<0x60> poly7_;
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Numeric::LFSRv<0x110> poly9_;
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Numeric::LFSRv<0x500> poly11_;
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Numeric::LFSRv<0x6000> poly15_;
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Numeric::LFSRv<0x12000> poly17_;
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};
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}
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#endif /* Dave_hpp */
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