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119 lines
2.8 KiB
C++
119 lines
2.8 KiB
C++
//
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// MasterSystem.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 20/09/2018.
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// Copyright © 2018 Thomas Harte. All rights reserved.
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//
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#include "MasterSystem.hpp"
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#include "../../Processors/Z80/Z80.hpp"
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#include "../../Components/9918/9918.hpp"
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#include "../../Components/SN76489/SN76489.hpp"
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#include "../CRTMachine.hpp"
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#include "../JoystickMachine.hpp"
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#include "../../ClockReceiver/ForceInline.hpp"
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#include "../../Outputs/Speaker/Implementation/LowpassSpeaker.hpp"
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namespace {
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const int sn76489_divider = 2;
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}
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namespace Sega {
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namespace MasterSystem {
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class ConcreteMachine:
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public Machine,
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public CPU::Z80::BusHandler,
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public CRTMachine::Machine {
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public:
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ConcreteMachine(const Analyser::Static::Target &target, const ROMMachine::ROMFetcher &rom_fetcher) :
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z80_(*this),
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sn76489_(TI::SN76489::Personality::SN76489, audio_queue_, sn76489_divider),
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speaker_(sn76489_) {
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speaker_.set_input_rate(3579545.0f / static_cast<float>(sn76489_divider));
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set_clock_rate(3579545);
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}
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~ConcreteMachine() {
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audio_queue_.flush();
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}
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void setup_output(float aspect_ratio) override {
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vdp_.reset(new TI::TMS::TMS9918(TI::TMS::TMS9918A));
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get_crt()->set_video_signal(Outputs::CRT::VideoSignal::Composite);
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}
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void close_output() override {
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vdp_.reset();
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}
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Outputs::CRT::CRT *get_crt() override {
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return vdp_->get_crt();
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}
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Outputs::Speaker::Speaker *get_speaker() override {
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return &speaker_;
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}
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void run_for(const Cycles cycles) override {
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z80_.run_for(cycles);
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}
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forceinline HalfCycles perform_machine_cycle(const CPU::Z80::PartialMachineCycle &cycle) {
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time_since_vdp_update_ += cycle.length;
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time_since_sn76489_update_ += cycle.length;
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if(time_until_interrupt_ > 0) {
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time_until_interrupt_ -= cycle.length;
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if(time_until_interrupt_ <= HalfCycles(0)) {
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z80_.set_non_maskable_interrupt_line(true, time_until_interrupt_);
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}
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}
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return HalfCycles(0);
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}
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void flush() {
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update_video();
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update_audio();
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audio_queue_.perform();
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}
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private:
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inline void update_audio() {
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speaker_.run_for(audio_queue_, time_since_sn76489_update_.divide_cycles(Cycles(sn76489_divider)));
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}
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inline void update_video() {
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vdp_->run_for(time_since_vdp_update_.flush());
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}
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CPU::Z80::Processor<ConcreteMachine, false, false> z80_;
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std::unique_ptr<TI::TMS::TMS9918> vdp_;
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Concurrency::DeferringAsyncTaskQueue audio_queue_;
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TI::SN76489 sn76489_;
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Outputs::Speaker::LowpassSpeaker<TI::SN76489> speaker_;
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HalfCycles time_since_vdp_update_;
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HalfCycles time_since_sn76489_update_;
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HalfCycles time_until_interrupt_;
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};
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}
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}
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using namespace Sega::MasterSystem;
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Machine *Machine::MasterSystem(const Analyser::Static::Target *target, const ROMMachine::ROMFetcher &rom_fetcher) {
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return new ConcreteMachine(*target, rom_fetcher);
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}
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Machine::~Machine() {}
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