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53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
//
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// TIASound.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 03/12/2016.
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// Copyright 2016 Thomas Harte. All rights reserved.
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//
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#ifndef Atari2600_TIASound_hpp
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#define Atari2600_TIASound_hpp
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#include "../../../Outputs/Speaker/Implementation/SampleSource.hpp"
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#include "../../../Concurrency/AsyncTaskQueue.hpp"
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namespace Atari2600 {
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// This should be a divisor of 38; audio counters are updated every 38 cycles, though lesser dividers
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// will give greater resolution to changes in audio state. 1, 2 and 19 are the only divisors of 38.
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constexpr int CPUTicksPerAudioTick = 2;
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class TIASound: public Outputs::Speaker::SampleSource {
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public:
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TIASound(Concurrency::AsyncTaskQueue<false> &audio_queue);
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void set_volume(int channel, uint8_t volume);
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void set_divider(int channel, uint8_t divider);
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void set_control(int channel, uint8_t control);
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// To satisfy ::SampleSource.
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void get_samples(std::size_t number_of_samples, int16_t *target);
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void set_sample_volume_range(std::int16_t range);
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static constexpr bool get_is_stereo() { return false; }
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private:
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Concurrency::AsyncTaskQueue<false> &audio_queue_;
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uint8_t volume_[2];
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uint8_t divider_[2];
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uint8_t control_[2];
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int poly4_counter_[2];
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int poly5_counter_[2];
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int poly9_counter_[2];
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int output_state_[2];
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int divider_counter_[2];
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int16_t per_channel_volume_ = 0;
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};
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}
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#endif /* Speaker_hpp */
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