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91 lines
2.4 KiB
C++
91 lines
2.4 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 Cheapocabra : public BaseMapper
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{
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private:
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unique_ptr<FlashSST39SF040> _flash;
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uint8_t _prgReg = 0;
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vector<uint8_t> _orgPrgRom;
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protected:
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uint16_t GetPRGPageSize() override { return 0x8000; }
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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 0x5000; }
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uint16_t RegisterEndAddress() override { return 0x5FFF; }
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uint32_t GetChrRamSize() override { return 0x4000; }
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bool AllowRegisterRead() override { return true; }
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void InitMapper() override
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{
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AddRegisterRange(0x7000, 0x7FFF, MemoryOperation::Write);
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_flash.reset(new FlashSST39SF040(_prgRom, _prgSize));
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AddRegisterRange(0x8000, 0xFFFF, MemoryOperation::Any);
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RemoveRegisterRange(0x5000, 0x5FFF, MemoryOperation::Read);
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WriteRegister(0x5000, GetPowerOnByte());
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_orgPrgRom = vector<uint8_t>(_prgRom, _prgRom + _prgSize);
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ApplySaveData();
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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(_prgReg, flash);
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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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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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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(addr < 0x8000) {
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_prgReg = value & 0x0F;
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SelectPRGPage(0, _prgReg);
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SelectCHRPage(0, (value >> 4) & 0x01);
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for(int i = 0; i < 8; i++) {
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SetNametable(i, ((value & 0x20) ? 8 : 0) + i);
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}
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} else {
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_flash->Write((_prgReg << 15) | (addr & 0x7FFF), value);
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}
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}
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}; |