mirror of
https://github.com/SourMesen/Mesen.git
synced 2024-05-20 05:01:03 -04:00
105 lines
2.5 KiB
C++
105 lines
2.5 KiB
C++
#pragma once
|
|
#include "stdafx.h"
|
|
#include "BaseMapper.h"
|
|
|
|
class MMC2 : public BaseMapper
|
|
{
|
|
private:
|
|
enum class MMC2Registers
|
|
{
|
|
RegA000 = 0xA,
|
|
RegB000 = 0xB,
|
|
RegC000 = 0xC,
|
|
RegD000 = 0xD,
|
|
RegE000 = 0xE,
|
|
RegF000 = 0xF
|
|
};
|
|
|
|
protected:
|
|
uint8_t _leftLatch;
|
|
uint8_t _rightLatch;
|
|
uint8_t _leftChrPage[2];
|
|
uint8_t _rightChrPage[2];
|
|
bool _needChrUpdate;
|
|
|
|
virtual uint16_t GetPRGPageSize() override { return 0x2000; }
|
|
virtual uint16_t GetCHRPageSize() override { return 0x1000; }
|
|
|
|
virtual void InitMapper() override
|
|
{
|
|
_leftLatch = 1;
|
|
_rightLatch = 1;
|
|
_leftChrPage[0] = GetPowerOnByte() & 0x1F;
|
|
_leftChrPage[1] = GetPowerOnByte() & 0x1F;
|
|
_rightChrPage[0] = GetPowerOnByte() & 0x1F;
|
|
_rightChrPage[1] = GetPowerOnByte() & 0x1F;
|
|
_needChrUpdate = false;
|
|
|
|
SelectPRGPage(1, -3);
|
|
SelectPRGPage(2, -2);
|
|
SelectPRGPage(3, -1);
|
|
}
|
|
|
|
void StreamState(bool saving) override
|
|
{
|
|
BaseMapper::StreamState(saving);
|
|
Stream(_leftLatch, _rightLatch, _needChrUpdate, _leftChrPage[0], _leftChrPage[1], _rightChrPage[0], _rightChrPage[1]);
|
|
}
|
|
|
|
void WriteRegister(uint16_t addr, uint8_t value) override
|
|
{
|
|
switch((MMC2Registers)(addr >> 12)) {
|
|
case MMC2Registers::RegA000:
|
|
SelectPRGPage(0, value & 0x0F);
|
|
break;
|
|
|
|
case MMC2Registers::RegB000:
|
|
_leftChrPage[0] = value & 0x1F;
|
|
SelectCHRPage(0, _leftChrPage[_leftLatch]);
|
|
break;
|
|
|
|
case MMC2Registers::RegC000:
|
|
_leftChrPage[1] = value & 0x1F;
|
|
SelectCHRPage(0, _leftChrPage[_leftLatch]);
|
|
break;
|
|
|
|
case MMC2Registers::RegD000:
|
|
_rightChrPage[0] = value & 0x1F;
|
|
SelectCHRPage(1, _rightChrPage[_rightLatch]);
|
|
break;
|
|
|
|
case MMC2Registers::RegE000:
|
|
_rightChrPage[1] = value & 0x1F;
|
|
SelectCHRPage(1, _rightChrPage[_rightLatch]);
|
|
break;
|
|
|
|
case MMC2Registers::RegF000:
|
|
SetMirroringType(((value & 0x01) == 0x01) ? MirroringType::Horizontal : MirroringType::Vertical);
|
|
break;
|
|
}
|
|
}
|
|
|
|
public:
|
|
virtual void NotifyVRAMAddressChange(uint16_t addr) override
|
|
{
|
|
if(_needChrUpdate) {
|
|
SelectCHRPage(0, _leftChrPage[_leftLatch]);
|
|
SelectCHRPage(1, _rightChrPage[_rightLatch]);
|
|
_needChrUpdate = false;
|
|
}
|
|
|
|
if(addr == 0x0FD8) {
|
|
_leftLatch = 0;
|
|
_needChrUpdate = true;
|
|
} else if(addr == 0x0FE8) {
|
|
_leftLatch = 1;
|
|
_needChrUpdate = true;
|
|
} else if(addr >= 0x1FD8 && addr <= 0x1FDF) {
|
|
_rightLatch = 0;
|
|
_needChrUpdate = true;
|
|
} else if(addr >= 0x1FE8 && addr <= 0x1FEF) {
|
|
_rightLatch = 1;
|
|
_needChrUpdate = true;
|
|
}
|
|
}
|
|
}; |