Mesen-SX/Core/GsuRomHandler.h

#pragma once
#include "stdafx.h"
#include "IMemoryHandler.h"
#include "GsuTypes.h"

class GsuRomHandler : public IMemoryHandler
{
private:
	GsuState* _state;
	IMemoryHandler* _romHandler;

public:
	GsuRomHandler(GsuState& state, IMemoryHandler* romHandler) : IMemoryHandler(SnesMemoryType::PrgRom)
	{
		_romHandler = romHandler;
		_state = &state;
	}

	uint8_t Read(uint32_t addr) override
	{
		if (!_state->SFR.Running || !_state->GsuRomAccess)
		{
			return _romHandler->Read(addr);
		}

		if (addr & 0x01)
		{
			return 0x01;
		}

		switch (addr & 0x0E)
		{
		default:
		case 2:
		case 6:
		case 8:
		case 0x0C:
			return 0;

		case 4: return 0x04;
		case 0x0A: return 0x08;
		case 0x0E: return 0x0C;
		}
	}

	uint8_t Peek(uint32_t addr) override
	{
		return Read(addr);
	}

	void PeekBlock(uint32_t addr, uint8_t* output) override
	{
		for (int i = 0; i < 0x1000; i++)
		{
			output[i] = Read(i);
		}
	}

	void Write(uint32_t addr, uint8_t value) override
	{
		//ROM
	}

	AddressInfo GetAbsoluteAddress(uint32_t address) override
	{
		if (!_state->SFR.Running || !_state->GsuRomAccess)
		{
			return _romHandler->GetAbsoluteAddress(address);
		}
		else
		{
			return {-1, SnesMemoryType::Register};
		}
	}
};