130 lines
4 KiB
C++
130 lines
4 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "BaseMapper.h"
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#include "FlashSST39SF040.h"
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#include "../Utilities/IpsPatcher.h"
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class UnRom512 : public BaseMapper
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{
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private:
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unique_ptr<FlashSST39SF040> _flash;
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bool _enableMirroringBit;
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uint8_t _prgBank = 0;
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vector<uint8_t> _orgPrgRom;
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protected:
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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 0; }
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uint32_t GetSaveRamSize() override { return 0; }
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uint16_t RegisterStartAddress() override { return 0x8000; }
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uint16_t RegisterEndAddress() override { return 0xFFFF; }
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uint32_t GetChrRamSize() override { return 0x8000; }
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bool HasBusConflicts() override { return !HasBattery(); }
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bool AllowRegisterRead() override { return HasBattery(); }
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void InitMapper() override
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{
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_flash.reset(new FlashSST39SF040(_prgRom, _prgSize));
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SelectPRGPage(0, 0);
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SelectPRGPage(1, -1);
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_enableMirroringBit = false;
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if(GetMirroringType() == MirroringType::ScreenAOnly || GetMirroringType() == MirroringType::ScreenBOnly) {
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SetMirroringType(MirroringType::ScreenAOnly);
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_enableMirroringBit = true;
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} else {
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switch(_romInfo.NesHeader.Byte6 & 0x09) {
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case 0: SetMirroringType(MirroringType::Horizontal); break;
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case 1: SetMirroringType(MirroringType::Vertical); break;
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case 8: SetMirroringType(MirroringType::ScreenAOnly); _enableMirroringBit = true; break;
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case 9: SetMirroringType(MirroringType::FourScreens); break;
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}
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}
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if(GetMirroringType() == MirroringType::FourScreens && _chrRam && _chrRamSize >= 0x8000) {
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//InfiniteNesLives four-screen mirroring variation, last 8kb of CHR RAM is always mapped to 0x2000-0x3FFF (0x3EFF due to palette)
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//This "breaks" the "UNROM512_4screen_test" test ROM - was the ROM actually tested on this board? Seems to contradict hardware specs
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SetPpuMemoryMapping(0x2000, 0x3FFF, ChrMemoryType::ChrRam, 0x6000, MemoryAccessType::ReadWrite);
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}
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_orgPrgRom = vector<uint8_t>(_prgRom, _prgRom + _prgSize);
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if(HasBattery()) {
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AddRegisterRange(0x8000, 0xFFFF, MemoryOperation::Read);
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ApplySaveData();
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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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SnapshotInfo flash { _flash.get() };
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Stream(_prgBank, flash);
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if(saving) {
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vector<uint8_t> prgRom = vector<uint8_t>(_prgRom, _prgRom + _prgSize);
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vector<uint8_t> ipsData = IpsPatcher::CreatePatch(_orgPrgRom, prgRom);
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VectorInfo<uint8_t> data { &ipsData };
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Stream(data);
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} else {
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vector<uint8_t> ipsData;
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VectorInfo<uint8_t> data { &ipsData };
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Stream(data);
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vector<uint8_t> patchedPrgRom;
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if(IpsPatcher::PatchBuffer(ipsData, _orgPrgRom, patchedPrgRom)) {
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memcpy(_prgRom, patchedPrgRom.data(), _prgSize);
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}
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}
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}
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void ApplySaveData()
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{
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//Apply save data (saved as an IPS file), if found
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vector<uint8_t> ipsData = _console->GetBatteryManager()->LoadBattery(".ips");
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if(!ipsData.empty()) {
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vector<uint8_t> patchedPrgRom;
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if(IpsPatcher::PatchBuffer(ipsData, _orgPrgRom, patchedPrgRom)) {
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memcpy(_prgRom, patchedPrgRom.data(), _prgSize);
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}
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}
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}
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void SaveBattery() override
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{
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if(HasBattery()) {
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vector<uint8_t> prgRom = vector<uint8_t>(_prgRom, _prgRom + _prgSize);
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vector<uint8_t> ipsData = IpsPatcher::CreatePatch(_orgPrgRom, prgRom);
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if(ipsData.size() > 8) {
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_console->GetBatteryManager()->SaveBattery(".ips", ipsData.data(), (uint32_t)ipsData.size());
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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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int16_t value = _flash->Read(addr);
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if(value >= 0) {
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return (uint8_t)value;
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}
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return BaseMapper::InternalReadRam(addr);
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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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if(!HasBattery() || addr >= 0xC000) {
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SelectPRGPage(0, value & 0x1F);
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_prgBank = value & 0x1F;
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SelectCHRPage(0, (value >> 5) & 0x03);
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if(_enableMirroringBit) {
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SetMirroringType(value & 0x80 ? MirroringType::ScreenBOnly : MirroringType::ScreenAOnly);
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}
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} else {
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_flash->Write((addr & 0x3FFF) | (_prgBank << 14), value);
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}
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}
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};
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