Mesen2/Core/NES/Mappers/Mmc3Variants/MMC3_Bmc411120C.h

#pragma once
#include "pch.h"
#include "NES/Mappers/Nintendo/MMC3.h"

class MMC3_Bmc411120C : public MMC3
{
private:
	uint8_t _exReg = 0;

protected:
	uint32_t GetDipSwitchCount() override { return 1; }

	void InitMapper() override
	{
		AddRegisterRange(0x6000, 0xFFFF, MemoryOperation::Write);
		_exReg = 0;

		MMC3::InitMapper();
	}

	void Serialize(Serializer& s) override
	{
		MMC3::Serialize(s);
		SV(_exReg);
	}
	
	void SelectChrPage(uint16_t slot, uint16_t page, ChrMemoryType memoryType = ChrMemoryType::Default) override
	{
		MMC3::SelectChrPage(slot, page | ((_exReg & 0x03) << 7), memoryType);
	}

	void SelectPrgPage(uint16_t slot, uint16_t page, PrgMemoryType memoryType = PrgMemoryType::PrgRom) override
	{
		if(_exReg & (0x08 | (GetDipSwitches() << 2))) {
			MMC3::SelectPrgPage4x(0, (((_exReg >> 4) & 0x03) | 0x0C) << 2);
		} else {
			MMC3::SelectPrgPage(slot, (page & 0x0F) | ((_exReg & 0x03) << 4));
		}
	}

	void WriteRegister(uint16_t addr, uint8_t value) override
	{
		if(addr < 0x8000) {
			_exReg = (uint8_t)addr;
			UpdateState();
		} else {
			MMC3::WriteRegister(addr, value);
		}
	}
};