Mesen/Core/Mapper57.h

53 lines
1.1 KiB
C++

#pragma once
#include "stdafx.h"
#include "BaseMapper.h"
class Mapper57 : public BaseMapper
{
private:
uint8_t _registers[2];
protected:
virtual uint16_t GetPRGPageSize() { return 0x4000; }
virtual uint16_t GetCHRPageSize() { return 0x2000; }
void InitMapper()
{
_registers[0] = 0;
_registers[1] = 0;
UpdateState();
}
void StreamState(bool saving)
{
BaseMapper::StreamState(saving);
Stream(_registers[0], _registers[1]);
}
void UpdateState()
{
SetMirroringType(_registers[1] & 0x08 ? MirroringType::Horizontal : MirroringType::Vertical);
SelectCHRPage(0, ((_registers[0] & 0x40) >> 3) | ((_registers[0] | _registers[1]) & 0x07));
if(_registers[1] & 0x10) {
SelectPRGPage(0, (_registers[1] >> 5) & 0x06);
SelectPRGPage(1, ((_registers[1] >> 5) & 0x06) + 1);
} else {
SelectPRGPage(0, (_registers[1] >> 5) & 0x07);
SelectPRGPage(1, (_registers[1] >> 5) & 0x07);
}
}
void WriteRegister(uint16_t addr, uint8_t value)
{
switch(addr & 0x8800) {
case 0x8000: _registers[0] = value; break;
case 0x8800: _registers[1] = value; break;
}
UpdateState();
}
};