Mesen/Core/Bmc64in1NoRepeat.h

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

class Bmc64in1NoRepeat : public BaseMapper
{
private:
	uint8_t _regs[4];

protected:
	uint16_t GetPRGPageSize() override { return 0x4000; }
	uint16_t GetCHRPageSize() override { return 0x2000; }

	void InitMapper() override
	{
		AddRegisterRange(0x5000, 0x5003, MemoryOperation::Write);
	}

	void Reset(bool softReset) override
	{
		BaseMapper::Reset(softReset);

		_regs[0] = 0x80;
		_regs[1] = 0x43;
		_regs[2] = _regs[3] = 0;

		UpdateState();
	}

	void StreamState(bool saving) override
	{
		BaseMapper::StreamState(saving);
		Stream(_regs[0], _regs[1], _regs[2], _regs[3]);
	}

	void UpdateState()
	{
		if(_regs[0] & 0x80) {
			if(_regs[1] & 0x80) {
				SelectPrgPage2x(0, (_regs[1] & 0x1F) << 1);
			} else {
				int bank = ((_regs[1] & 0x1F) << 1) | ((_regs[1] >> 6) & 0x01);
				SelectPRGPage(0, bank);
				SelectPRGPage(1, bank);
			}
		} else {
			SelectPRGPage(1, ((_regs[1] & 0x1F) << 1) | ((_regs[1] >> 6) & 0x01));
		}
		SetMirroringType(_regs[0] & 0x20 ? MirroringType::Horizontal : MirroringType::Vertical);
		SelectCHRPage(0, (_regs[2] << 2) | ((_regs[0] >> 1) & 0x03));
	}

	void WriteRegister(uint16_t addr, uint8_t value) override
	{
		if(addr < 0x8000) {
			_regs[addr & 0x03] = value;
		} else {
			_regs[3] = value;
		}

		UpdateState();
	}
};