mirror of
https://github.com/SourMesen/Mesen2.git
synced 2025-04-02 10:21:44 -04:00
133 lines
No EOL
3.6 KiB
C++
133 lines
No EOL
3.6 KiB
C++
#pragma once
|
|
#include "pch.h"
|
|
#include "NES/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 = 0;
|
|
uint8_t _rightLatch = 0;
|
|
uint8_t _prgPage = 0;
|
|
uint8_t _leftChrPage[2] = {};
|
|
uint8_t _rightChrPage[2] = {};
|
|
bool _needChrUpdate = 0;
|
|
|
|
uint16_t GetPrgPageSize() override { return 0x2000; }
|
|
uint16_t GetChrPageSize() override { return 0x1000; }
|
|
bool EnableVramAddressHook() override { return true; }
|
|
|
|
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 Serialize(Serializer& s) override
|
|
{
|
|
BaseMapper::Serialize(s);
|
|
SV(_prgPage);
|
|
SV(_leftLatch);
|
|
SV(_rightLatch);
|
|
SV(_needChrUpdate);
|
|
SV(_leftChrPage[0]);
|
|
SV(_leftChrPage[1]);
|
|
SV(_rightChrPage[0]);
|
|
SV(_rightChrPage[1]);
|
|
}
|
|
|
|
void WriteRegister(uint16_t addr, uint8_t value) override
|
|
{
|
|
switch((MMC2Registers)(addr >> 12)) {
|
|
case MMC2Registers::RegA000:
|
|
_prgPage = value & 0x0F;
|
|
SelectPrgPage(0, _prgPage);
|
|
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;
|
|
}
|
|
}
|
|
|
|
vector<MapperStateEntry> GetMapperStateEntries() override
|
|
{
|
|
vector<MapperStateEntry> entries;
|
|
string mirroringType;
|
|
int64_t mirValue = 0;
|
|
switch(GetMirroringType()) {
|
|
case MirroringType::Vertical: mirroringType = "Vertical"; mirValue = 0; break;
|
|
case MirroringType::Horizontal: mirroringType = "Horizontal"; mirValue = 1; break;
|
|
}
|
|
entries.push_back(MapperStateEntry("$A000.0-3", "PRG Bank", _prgPage, MapperStateValueType::Number8));
|
|
entries.push_back(MapperStateEntry("$B000.0-4", "CHR Bank ($0000) ($FD)", _leftChrPage[0], MapperStateValueType::Number8));
|
|
entries.push_back(MapperStateEntry("$C000.0-4", "CHR Bank ($0000) ($FE)", _leftChrPage[1], MapperStateValueType::Number8));
|
|
entries.push_back(MapperStateEntry("$D000.0-4", "CHR Bank ($1000) ($FD)", _rightChrPage[0], MapperStateValueType::Number8));
|
|
entries.push_back(MapperStateEntry("$E000.0-4", "CHR Bank ($1000) ($FE)", _rightChrPage[1], MapperStateValueType::Number8));
|
|
entries.push_back(MapperStateEntry("$F000.0", "Mirroring", mirroringType, mirValue));
|
|
return entries;
|
|
}
|
|
|
|
public:
|
|
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;
|
|
}
|
|
}
|
|
}; |