mirror of
https://github.com/TomHarte/CLK.git
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2253341904
Which hopefully gives me as much as I need to implement joypads, etc, and definitively get to just the VDP being outstanding.
252 lines
6.9 KiB
C++
252 lines
6.9 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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#include "../../Analyser/Static/Sega/Target.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::Sega::Target &target, const ROMMachine::ROMFetcher &rom_fetcher) :
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z80_(*this),
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sn76489_(TI::SN76489::Personality::SMS, 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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for(auto &pointer: read_pointers_) {
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pointer = nullptr;
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}
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for(auto &pointer: write_pointers_) {
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pointer = nullptr;
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}
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// Take a copy of the cartridge and place it into memory.
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cartridge_ = target.media.cartridges[0]->get_segments()[0].data;
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map(read_pointers_, cartridge_.data(), static_cast<int>(cartridge_.size()), 0x0000, 0xc000);
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// Establish the BIOS (if relevant) and RAM.
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if(target.model == Analyser::Static::Sega::Target::Model::MasterSystem) {
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const auto roms = rom_fetcher("MasterSystem", {"bios.sms"});
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if(!roms[0]) {
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throw ROMMachine::Error::MissingROMs;
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}
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roms[0]->resize(8*1024);
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memcpy(&bios_, roms[0]->data(), roms[0]->size());
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map(read_pointers_, bios_, 8*1024, 0);
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map(read_pointers_, ram_, 8*1024, 0xc000, 0x10000);
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map(write_pointers_, ram_, 8*1024, 0xc000, 0x10000);
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} else {
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map(read_pointers_, ram_, 1024, 0xc000, 0x10000);
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map(write_pointers_, ram_, 1024, 0xc000, 0x10000);
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}
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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::SMSVDP));
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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(cycle.is_terminal()) {
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uint16_t address = cycle.address ? *cycle.address : 0x0000;
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switch(cycle.operation) {
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case CPU::Z80::PartialMachineCycle::ReadOpcode:
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case CPU::Z80::PartialMachineCycle::Read:
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*cycle.value = read_pointers_[address >> 10] ? read_pointers_[address >> 10][address & 1023] : 0xff;
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break;
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case CPU::Z80::PartialMachineCycle::Write:
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if(write_pointers_[address >> 10]) write_pointers_[address >> 10][address & 1023] = *cycle.value;
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break;
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case CPU::Z80::PartialMachineCycle::Input:
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switch(address & 0xc1) {
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case 0x00:
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printf("TODO: memory control\n");
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*cycle.value = 0xff;
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break;
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case 0x01:
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printf("TODO: I/O port control\n");
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*cycle.value = 0xff;
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break;
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case 0x40: case 0x41:
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printf("TODO: get current line\n");
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*cycle.value = 0xff;
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break;
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case 0x80: case 0x81:
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update_video();
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*cycle.value = vdp_->get_register(address);
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z80_.set_interrupt_line(vdp_->get_interrupt_line());
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time_until_interrupt_ = vdp_->get_time_until_interrupt();
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break;
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case 0xc0:
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printf("TODO: I/O port A/N\n");
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*cycle.value = 0;
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break;
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case 0xc1:
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printf("TODO: I/O port B/misc\n");
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*cycle.value = 0;
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break;
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default:
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printf("Clearly some sort of typo\n");
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break;
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}
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break;
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case CPU::Z80::PartialMachineCycle::Output:
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switch(address & 0xc1) {
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case 0x00:
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printf("TODO: memory control\n");
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break;
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case 0x01:
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printf("TODO: I/O port control\n");
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break;
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case 0x40: case 0x41:
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update_audio();
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sn76489_.set_register(*cycle.value);
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break;
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case 0x80: case 0x81:
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update_video();
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vdp_->set_register(address, *cycle.value);
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z80_.set_interrupt_line(vdp_->get_interrupt_line());
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time_until_interrupt_ = vdp_->get_time_until_interrupt();
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break;
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case 0xc0:
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printf("TODO: I/O port A/N\n");
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break;
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case 0xc1:
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printf("TODO: I/O port B/misc\n");
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break;
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default:
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printf("Clearly some sort of typo\n");
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break;
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}
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break;
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case CPU::Z80::PartialMachineCycle::Interrupt:
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*cycle.value = 0xff;
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break;
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default: break;
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}
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}
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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_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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uint8_t ram_[8*1024];
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uint8_t bios_[8*1024];
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std::vector<uint8_t> cartridge_;
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// The memory map has a 1kb granularity; this is determined by the SG1000's 1kb of RAM.
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const uint8_t *read_pointers_[64];
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uint8_t *write_pointers_[64];
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template <typename T> void map(T **target, uint8_t *source, int size, int start_address, int end_address = -1) {
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if(end_address == -1) end_address = start_address + size;
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for(int address = start_address; address < end_address; address += 1024) {
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target[address >> 10] = &source[(address - start_address) & (size - 1)];
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}
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}
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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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using Target = Analyser::Static::Sega::Target;
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const Target *const sega_target = dynamic_cast<const Target *>(target);
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return new ConcreteMachine(*sega_target, rom_fetcher);
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}
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Machine::~Machine() {}
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