Mesen/Core/MMC3_208.h

#pragma once
#include "stdafx.h"
#include "MMC3.h"

class MMC3_208 : public MMC3
{
private:
	const uint8_t _protectionLut[256] = {
		0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x49, 0x19, 0x09, 0x59, 0x49, 0x19, 0x09,
		0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x51, 0x41, 0x11, 0x01, 0x51, 0x41, 0x11, 0x01,
		0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x49, 0x19, 0x09, 0x59, 0x49, 0x19, 0x09,
		0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x51, 0x41, 0x11, 0x01, 0x51, 0x41, 0x11, 0x01,
		0x00, 0x10, 0x40, 0x50, 0x00, 0x10, 0x40, 0x50, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0x08, 0x18, 0x48, 0x58, 0x08, 0x18, 0x48, 0x58, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0x00, 0x10, 0x40, 0x50, 0x00, 0x10, 0x40, 0x50, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0x08, 0x18, 0x48, 0x58, 0x08, 0x18, 0x48, 0x58, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x58, 0x48, 0x18, 0x08, 0x58, 0x48, 0x18, 0x08,
		0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x50, 0x40, 0x10, 0x00, 0x50, 0x40, 0x10, 0x00,
		0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x58, 0x48, 0x18, 0x08, 0x58, 0x48, 0x18, 0x08,
		0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x59, 0x50, 0x40, 0x10, 0x00, 0x50, 0x40, 0x10, 0x00,
		0x01, 0x11, 0x41, 0x51, 0x01, 0x11, 0x41, 0x51, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0x09, 0x19, 0x49, 0x59, 0x09, 0x19, 0x49, 0x59, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0x01, 0x11, 0x41, 0x51, 0x01, 0x11, 0x41, 0x51, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0x09, 0x19, 0x49, 0x59, 0x09, 0x19, 0x49, 0x59, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	};

	uint8_t _exRegs[7];

protected:
	uint16_t RegisterStartAddress() override { return 0x8000; }
	uint16_t RegisterEndAddress() override { return 0xFFFF; }
	bool AllowRegisterRead() override { return true; }

	void InitMapper() override
	{
		_exRegs[5] = 3;
		MMC3::InitMapper();
		if(_romInfo.SubMapperID == 0) {
			AddRegisterRange(0x4800, 0x4FFF, MemoryOperation::Write);
			AddRegisterRange(0x6800, 0x6FFF, MemoryOperation::Write);
			AddRegisterRange(0x5000, 0x5FFF, MemoryOperation::Write);
			AddRegisterRange(0x5800, 0x5FFF, MemoryOperation::Read);
		}
		RemoveRegisterRange(0x8000, 0xFFFF, MemoryOperation::Read);
	}

	void StreamState(bool saving) override
	{
		MMC3::StreamState(saving);
		ArrayInfo<uint8_t> exRegs { _exRegs, 7 };
		Stream(exRegs);
	}

	void UpdatePrgMapping() override
	{
		if(_romInfo.SubMapperID == 1) {
			SelectPrgPage4x(0, MMC3::_registers[6]);
		} else {
			SelectPrgPage4x(0, _exRegs[5] << 2);
		}
	}

	void UpdateMirroring() override
	{
		if(_romInfo.SubMapperID == 1) {
			MMC3::UpdateMirroring();
		} else {
			SetMirroringType(_exRegs[6] ? MirroringType::Horizontal : MirroringType::Vertical);
		}
	}

	uint8_t ReadRegister(uint16_t addr) override
	{
		return _exRegs[addr & 0x03];
	}

	void WriteRegister(uint16_t addr, uint8_t value) override
	{
		if(addr >= 0x5000 && addr <= 0x5FFF) {
			if(addr <= 0x57FF) {
				_exRegs[4] = value;
			} else {
				_exRegs[addr & 0x03] = value ^ _protectionLut[_exRegs[4]];
			}
		} else if(addr < 0x8000) {
			_exRegs[5] = (value & 0x01) | ((value >> 3) & 0x02);
			_exRegs[6] = (value >> 5) & 0x01;
			UpdatePrgMapping();
		} else {
			MMC3::WriteRegister(addr, value);
		}
	}
};