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65 lines
1.5 KiB
C++
65 lines
1.5 KiB
C++
//
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// Bus.h
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// Clock Signal
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//
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// Created by Thomas Harte on 18/03/2017.
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// Copyright © 2017 Thomas Harte. All rights reserved.
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//
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#ifndef Atari2600_Bus_hpp
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#define Atari2600_Bus_hpp
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#include "Atari2600.hpp"
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#include "PIA.hpp"
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#include "Speaker.hpp"
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#include "TIA.hpp"
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namespace Atari2600 {
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class Bus {
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public:
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Bus() :
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tia_input_value_{0xff, 0xff},
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cycles_since_speaker_update_(0),
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cycles_since_video_update_(0),
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cycles_since_6532_update_(0) {}
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virtual void run_for_cycles(int number_of_cycles) = 0;
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virtual void set_reset_line(bool state) = 0;
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// the RIOT, TIA and speaker
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PIA mos6532_;
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std::shared_ptr<TIA> tia_;
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std::shared_ptr<Speaker> speaker_;
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// joystick state
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uint8_t tia_input_value_[2];
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protected:
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// speaker backlog accumlation counter
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unsigned int cycles_since_speaker_update_;
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inline void update_audio() {
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unsigned int audio_cycles = cycles_since_speaker_update_ / (CPUTicksPerAudioTick * 3);
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cycles_since_speaker_update_ %= (CPUTicksPerAudioTick * 3);
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speaker_->run_for_cycles(audio_cycles);
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}
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// video backlog accumulation counter
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unsigned int cycles_since_video_update_;
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inline void update_video() {
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tia_->run_for_cycles((int)cycles_since_video_update_);
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cycles_since_video_update_ = 0;
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}
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// RIOT backlog accumulation counter
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unsigned int cycles_since_6532_update_;
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inline void update_6532() {
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mos6532_.run_for_cycles(cycles_since_6532_update_);
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cycles_since_6532_update_ = 0;
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}
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};
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}
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#endif /* Atari2600_Bus_hpp */
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