mirror of
https://github.com/SourMesen/Mesen2.git
synced 2025-04-02 10:21:44 -04:00
121 lines
No EOL
2.9 KiB
C++
121 lines
No EOL
2.9 KiB
C++
#pragma once
|
|
#include "pch.h"
|
|
#include "NES/BaseMapper.h"
|
|
|
|
class Tf1201 : public BaseMapper
|
|
{
|
|
private:
|
|
uint8_t _chrRegs[8] = {};
|
|
uint8_t _prgRegs[2] = {};
|
|
bool _swapPrg = false;
|
|
uint8_t _irqCounter = 0;
|
|
uint8_t _irqReloadValue = 0;
|
|
int16_t _irqScaler = 0;
|
|
bool _irqEnabled = false;
|
|
|
|
protected:
|
|
uint16_t GetPrgPageSize() override { return 0x2000; }
|
|
uint16_t GetChrPageSize() override { return 0x400; }
|
|
bool EnableCpuClockHook() override { return true; }
|
|
|
|
void InitMapper() override
|
|
{
|
|
memset(_prgRegs, 0, sizeof(_prgRegs));
|
|
memset(_chrRegs, 0, sizeof(_chrRegs));
|
|
_swapPrg = false;
|
|
|
|
_irqCounter = 0;
|
|
_irqReloadValue = 0;
|
|
_irqScaler = 0;
|
|
_irqEnabled = false;
|
|
|
|
UpdateChr();
|
|
UpdatePrg();
|
|
}
|
|
|
|
void Serialize(Serializer& s) override
|
|
{
|
|
BaseMapper::Serialize(s);
|
|
SVArray(_prgRegs, 2);
|
|
SVArray(_chrRegs, 8);
|
|
SV(_swapPrg);
|
|
SV(_irqCounter);
|
|
SV(_irqReloadValue);
|
|
SV(_irqScaler);
|
|
SV(_irqEnabled);
|
|
}
|
|
|
|
void UpdateChr()
|
|
{
|
|
for(int i = 0; i < 8; i++) {
|
|
SelectChrPage(i, _chrRegs[i]);
|
|
}
|
|
}
|
|
|
|
void UpdatePrg()
|
|
{
|
|
if(_swapPrg) {
|
|
SelectPrgPage(0, -2);
|
|
SelectPrgPage(2, _prgRegs[0]);
|
|
} else {
|
|
SelectPrgPage(0, _prgRegs[0]);
|
|
SelectPrgPage(2, -2);
|
|
}
|
|
SelectPrgPage(1, _prgRegs[1]);
|
|
SelectPrgPage(3, -1);
|
|
}
|
|
|
|
void ProcessCpuClock() override
|
|
{
|
|
BaseProcessCpuClock();
|
|
|
|
if(_irqEnabled) {
|
|
_irqScaler -= 3;
|
|
if(_irqScaler <= 0) {
|
|
_irqScaler += 341;
|
|
_irqCounter++;
|
|
if(_irqCounter == 0) {
|
|
_console->GetCpu()->SetIrqSource(IRQSource::External);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void WriteRegister(uint16_t addr, uint8_t value) override
|
|
{
|
|
addr = (addr & 0xF003) | ((addr & 0x0C) >> 2);
|
|
if(addr >= 0xB000 && addr <= 0xE003) {
|
|
int slot = (((addr >> 11) - 6) | (addr & 0x01)) & 0x07;
|
|
int shift = ((addr & 0x02) << 1);
|
|
_chrRegs[slot] = (_chrRegs[slot] & (0xF0 >> shift)) | ((value & 0x0F) << shift);
|
|
UpdateChr();
|
|
} else {
|
|
switch(addr & 0xF003) {
|
|
case 0x8000: _prgRegs[0] = value; UpdatePrg(); break;
|
|
case 0xA000: _prgRegs[1] = value; UpdatePrg(); break;
|
|
case 0x9000: SetMirroringType(value & 0x01 ? MirroringType::Horizontal : MirroringType::Vertical); break;
|
|
case 0x9001: _swapPrg = (value & 0x03) != 0; UpdatePrg(); break;
|
|
|
|
case 0xF000: _irqReloadValue = (_irqReloadValue & 0xF0) | (value & 0x0F); break;
|
|
case 0xF002: _irqReloadValue = (_irqReloadValue & 0x0F) | (value << 4); break;
|
|
|
|
case 0xF001:
|
|
//VRC-like IRQs? This seems to make more sense than A12-based IRQs
|
|
//considering FCEUX/puNES both adjust the counter value based on when
|
|
//on the screen the IRQ is enabled.
|
|
//This still some glitches on the screen, but relatively minor ones.
|
|
_irqEnabled = (value & 0x02) == 0x02;
|
|
if(_irqEnabled) {
|
|
_irqScaler = 341;
|
|
_irqCounter = _irqReloadValue;
|
|
}
|
|
_console->GetCpu()->ClearIrqSource(IRQSource::External);
|
|
break;
|
|
|
|
case 0xF003:
|
|
_console->GetCpu()->ClearIrqSource(IRQSource::External);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}; |