mirror of
https://github.com/SourMesen/Mesen2.git
synced 2025-04-02 10:21:44 -04:00
d72658de7a
+ Added option to save directly to the original rom file instead of creating .ips files (for FDS & cartridges with flashable prg/chr rom)
115 lines
3.2 KiB
C++
115 lines
3.2 KiB
C++
#pragma once
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#include "pch.h"
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#include "NES/BaseMapper.h"
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#include "NES/Mappers/Homebrew/FlashSST39SF040.h"
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#include "Shared/BatteryManager.h"
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#include "Utilities/Patches/IpsPatcher.h"
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#include "Utilities/Serializer.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 = false;
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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.Header.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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if(HasBattery()) {
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AddRegisterRange(0x8000, 0xFFFF, MemoryOperation::Read);
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_orgPrgRom = vector<uint8_t>(_prgRom, _prgRom + _prgSize);
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ApplySaveData();
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}
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}
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void Serialize(Serializer& s) override
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{
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BaseMapper::Serialize(s);
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SV(_flash);
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SV(_prgBank);
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SerializeRomDiff(s, _orgPrgRom);
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}
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void ApplySaveData()
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{
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if(_console->GetNesConfig().DisableFlashSaves) {
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return;
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}
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LoadRomPatch(_orgPrgRom);
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}
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void SaveBattery() override
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{
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if(_console->GetNesConfig().DisableFlashSaves) {
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return;
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}
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if(HasBattery()) {
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SaveRom(_orgPrgRom);
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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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