mirror of
https://github.com/NovaSquirrel/Mesen-X.git
synced 2024-06-01 02:48:18 -04:00
339 lines
9.4 KiB
C++
339 lines
9.4 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "BaseMapper.h"
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#include "MemoryManager.h"
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#include "Console.h"
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#include "CPU.h"
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#include "../Utilities/WavReader.h"
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#include "../Utilities/FolderUtilities.h"
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#include "../Utilities/StringUtilities.h"
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#include "../Utilities/HexUtilities.h"
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class StudyBox : public BaseMapper
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{
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private:
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shared_ptr<WavReader> _wavReader;
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uint32_t _audioSampleRate;
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bool _readyForBit = false;
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uint16_t _processBitDelay = 0;
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uint8_t _reg4202 = 0;
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uint8_t _commandCounter = 0;
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uint8_t _command = 0;
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uint8_t _currentPage = 0;
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int16_t _seekPage = 0;
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uint32_t _seekPageDelay = 0;
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bool _enableDecoder = false;
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bool _audioEnabled = false;
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bool _motorDisabled = false;
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uint16_t _byteReadDelay = 0;
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bool _irqEnabled = false;
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bool _pageFound = false;
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StudyBoxData _tapeData;
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int32_t _pageIndex = 0;
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int32_t _pagePosition = -1;
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uint32_t _inDataDelay = 0;
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bool _inDataRegion = false;
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protected:
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uint16_t RegisterStartAddress() override { return 0x4200; }
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uint16_t RegisterEndAddress() override { return 0x4203; }
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bool AllowRegisterRead() override { return true; }
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uint16_t GetPRGPageSize() override { return 0x4000; }
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uint16_t GetCHRPageSize() override { return 0x2000; }
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uint32_t GetWorkRamSize() override { return 0x10000; }
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uint32_t GetWorkRamPageSize() override { return 0x1000; }
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void InitMapper() override
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{
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SelectPRGPage(1, 0);
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SelectCHRPage(0, 0);
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//First bank (on the 2nd RAM chip, so bank #8 in the code) is mapped to 4000-4FFF, but the first 1kb is not accessible
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SetCpuMemoryMapping(0x4000, 0x4FFF, 8, PrgMemoryType::WorkRam);
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RemoveCpuMemoryMapping(0x4000, 0x43FF);
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SetMirroringType(MirroringType::FourScreens);
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}
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void InitMapper(RomData& romData) override
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{
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_tapeData = romData.StudyBox;
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_wavReader = WavReader::Create(_tapeData.AudioFile.data(), (uint32_t)_tapeData.AudioFile.size());
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if(!_wavReader) {
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_audioSampleRate = 44100;
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MessageManager::Log("[Study Box] Unsupported audio file format.");
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} else {
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_audioSampleRate = _wavReader->GetSampleRate();
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}
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}
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void StreamState(bool saving) override
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{
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BaseMapper::StreamState(saving);
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int32_t audioPosition = _wavReader ? _wavReader->GetPosition() : -1;
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Stream(
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_readyForBit, _processBitDelay, _reg4202, _commandCounter, _command, _currentPage, _seekPage, _seekPageDelay, _enableDecoder,
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_audioEnabled, _motorDisabled, _byteReadDelay, _irqEnabled, _pageFound, _pageIndex, _pagePosition, _inDataDelay, _inDataRegion, audioPosition
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);
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if(!saving && audioPosition >= 0 && _wavReader) {
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_wavReader->SetSampleRate(_console->GetSettings()->GetSampleRate());
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_wavReader->Play(audioPosition);
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}
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}
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void ReadLeadInTrack()
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{
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//Wait for the tape to read through the lead-in before the actual data
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_inDataDelay = (uint64_t)(_tapeData.Pages[_pageIndex].AudioOffset - _tapeData.Pages[_pageIndex].LeadInOffset) * _console->GetCpu()->GetClockRate(_console->GetModel()) / _audioSampleRate;
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_pagePosition = -1;
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_byteReadDelay = 0;
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_motorDisabled = false;
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_pageFound = true;
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}
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void ProcessCpuClock() override
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{
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if(_processBitDelay > 0) {
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_processBitDelay--;
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if(_processBitDelay == 0) {
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_readyForBit = true;
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}
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}
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if(_motorDisabled) {
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return;
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}
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if(_seekPage != _currentPage) {
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_seekPageDelay--;
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if(_seekPageDelay == 0) {
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_seekPageDelay = 3000000;
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if(_seekPage > _currentPage) {
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_currentPage++;
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} else {
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_currentPage--;
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}
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_pageIndex = 0;
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for(size_t i = 0; i < _tapeData.Pages.size(); i++) {
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if(_tapeData.Pages[i].Data[5] == _currentPage - 1) {
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//Find the first page that matches the requested page number
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_pageIndex = (int32_t)i;
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break;
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}
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}
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ReadLeadInTrack();
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}
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} else if(_inDataDelay > 0) {
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_inDataRegion = true;
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_inDataDelay--;
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if(_inDataDelay == 0) {
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_byteReadDelay = 7820;
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if(_wavReader) {
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_wavReader->SetSampleRate(_console->GetSettings()->GetSampleRate());
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_wavReader->Play(_tapeData.Pages[_pageIndex].AudioOffset);
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}
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_console->GetCpu()->SetIrqSource(IRQSource::External);
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}
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} else if(_byteReadDelay > 0) {
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_byteReadDelay--;
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if(_byteReadDelay == 0) {
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_byteReadDelay = 3355;
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_pagePosition++;
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if(_pagePosition >= (int32_t)_tapeData.Pages[_pageIndex].Data.size()) {
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_pageFound = false;
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_inDataRegion = false;
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_motorDisabled = true;
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}
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if(_irqEnabled) {
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_console->GetCpu()->SetIrqSource(IRQSource::External);
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}
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}
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}
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}
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uint8_t ReadRegister(uint16_t addr) override
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{
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switch(addr) {
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case 0x4200: {
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if(!_enableDecoder) {
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MessageManager::Log("Error - read 4200 without decoder being enabled");
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}
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_console->GetCpu()->ClearIrqSource(IRQSource::External);
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if(_pagePosition >= 0 && _pagePosition < (int32_t)_tapeData.Pages[_pageIndex].Data.size()) {
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//MessageManager::Log("Read: " + HexUtilities::ToHex(_tapeData.Pages[_pageIndex].Data[_pagePosition]));
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return _tapeData.Pages[_pageIndex].Data[_pagePosition];
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}
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//After command $86, games expect to read 1 $AA byte before the $C5 header
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return 0xAA;
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}
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case 0x4201: {
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/* Tape read status ?
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$80 - something to do with $4202.0 ? decoder disabled ? | decoder data ready ?
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$40 - tape data clock synched ? current tape data bit ? | current tape flux polarity ? tape motor running ? | seek complete ?
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$20 - set when in data region during seek ? possibly set when in data region generally ? or set normally and cleared when in a data region ?
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$10 - ? ? ? */
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uint8_t value = (
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//0x10 |
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(_inDataRegion ? 0x20 : 0) |
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(_pageFound ? 0x40 : 0) |
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(_enableDecoder ? 0x80 : 0)
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);
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_pageFound = false;
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return value;
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}
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case 0x4202:
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//Tape drive status?
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//$40 - shift register ready for next bit?
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//$08 - power supply not connected
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return (
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//(_powerDisconnected ? 0x08 : 0) |
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(_readyForBit ? 0x40 : 0)
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);
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case 0x4203:
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//unused?
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return 0x00;
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}
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return 0;
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}
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void WriteRegister(uint16_t addr, uint8_t value) override
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{
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switch(addr) {
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case 0x4200:
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SetCpuMemoryMapping(0x6000, 0x6FFF, (value & 0xC0) >> 5, PrgMemoryType::WorkRam);
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SetCpuMemoryMapping(0x7000, 0x7FFF, ((value & 0xC0) >> 5) + 1, PrgMemoryType::WorkRam);
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SetCpuMemoryMapping(0x5000, 0x5FFF, (value & 0x07) + 8, PrgMemoryType::WorkRam);
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break;
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case 0x4201:
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//PRG Select
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SelectPRGPage(0, value);
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break;
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case 0x4202:
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/*Tape drive control
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$80 - output data bit
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$40 - ???
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$20 - pulse low to reset drive controller?
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$10 - pulse low to clock data bit
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$08 - ???
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$04 - ??? maybe tape audio enable?
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$02 - irq enable?
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$01 - data decoding enable?
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*/
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if((_reg4202 & 0x10) && !(value & 0x10)) {
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if(!_readyForBit) {
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MessageManager::Log("Error - write without being ready");
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}
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//Clock command bit
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_command <<= 1;
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_command |= (value & 0x80) >> 7;
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_commandCounter++;
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if(_commandCounter == 8) {
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_commandCounter = 0;
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//MessageManager::Log("Command sent: " + std::to_string(_command));
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if(_command >= 1 && _command < 0x40) {
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//Move forward X pages
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_seekPage = _command + _currentPage;
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_seekPageDelay = 3000000;
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_motorDisabled = false;
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} else if(_command > 0x40 && _command < 0x80) {
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//Move back X pages
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_seekPage = -(_command - 0x40) + _currentPage;
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_seekPageDelay = 3000000;
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_motorDisabled = false;
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} else if(_command == 0) {
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//Move back to the start of this page (based on the internal page ID, not the page "index" in the array? - to validate)
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_seekPage = _currentPage;
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_currentPage = _currentPage - 1;
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_seekPageDelay = 3000000;
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_motorDisabled = false;
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} else if(_command == 0x86) {
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//Reenable motor (and continue to the next page)
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if(_pageIndex < (int32_t)_tapeData.Pages.size() - 1) {
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_pageIndex++;
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} else {
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//Pretend we go back to the start of the tape (inaccurate)
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_pageIndex = 0;
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}
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ReadLeadInTrack();
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} else {
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MessageManager::Log("Unknown command sent: " + std::to_string(_command));
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}
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}
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}
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if(value & 0x10) {
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_readyForBit = false;
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_processBitDelay = 100;
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}
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/*if((_reg4202 & 0x6E) != (value & 0x6E)) {
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MessageManager::Log("Reg 4202 value changed: " + HexUtilities::ToHex(_reg4202) + " -> " + HexUtilities::ToHex(value));
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}*/
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if((_reg4202 & 0x20) && !(value & 0x20)) {
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//Reset drive
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_command = 0;
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_commandCounter = 0;
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_readyForBit = true;
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}
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if((value & 0x04) != (_reg4202 & 0x04)) {
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_audioEnabled = (value & 0x04) == 0;
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//MessageManager::Log(_audioEnabled ? "Audio enabled" : "Audio disabled");
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}
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if((value & 0x02) != (_reg4202 & 0x02)) {
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//MessageManager::Log((value & 0x02) ? "IRQ enabled" : "IRQ disabled");
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}
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/*if((value & 0x01) != (_reg4202 & 0x01)) {
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MessageManager::Log((value & 0x01) ? "Decoder enabled" : "Decoder disabled");
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}*/
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_reg4202 = value;
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_enableDecoder = value & 0x01;
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_irqEnabled = value & 0x02;
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_console->GetCpu()->ClearIrqSource(IRQSource::External);
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break;
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case 0x4203:
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//Unused?
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break;
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}
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}
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public:
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void ApplySamples(int16_t* buffer, size_t sampleCount, double volume) override
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{
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if(!_motorDisabled && _wavReader) {
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_wavReader->ApplySamples(buffer, sampleCount, _audioEnabled ? volume : 0);
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_wavReader->SetSampleRate(_console->GetSettings()->GetSampleRate());
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}
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}
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}; |