mirror of
https://github.com/SourMesen/Mesen.git
synced 2024-06-02 11:28:17 -04:00
77 lines
1.9 KiB
C++
77 lines
1.9 KiB
C++
#pragma once
|
|
#include "stdafx.h"
|
|
#include "BaseMapper.h"
|
|
#include "A12Watcher.h"
|
|
|
|
class Mapper117 : public BaseMapper
|
|
{
|
|
private:
|
|
uint8_t _irqCounter;
|
|
uint8_t _irqReloadValue;
|
|
bool _irqEnabled;
|
|
bool _irqEnabledAlt;
|
|
A12Watcher _a12Watcher;
|
|
|
|
protected:
|
|
virtual uint16_t GetPRGPageSize() override { return 0x2000; }
|
|
virtual uint16_t GetCHRPageSize() override { return 0x400; }
|
|
|
|
void InitMapper() override
|
|
{
|
|
_irqEnabled = false;
|
|
_irqEnabledAlt = false;
|
|
_irqCounter = 0;
|
|
_irqReloadValue = 0;
|
|
|
|
SelectPrgPage4x(0, -4);
|
|
}
|
|
|
|
void StreamState(bool saving) override
|
|
{
|
|
BaseMapper::StreamState(saving);
|
|
SnapshotInfo a12Watcher{ &_a12Watcher };
|
|
Stream(_irqCounter, _irqEnabled, _irqEnabledAlt, _irqReloadValue, a12Watcher);
|
|
}
|
|
|
|
void NotifyVRAMAddressChange(uint16_t addr) override
|
|
{
|
|
if(_a12Watcher.UpdateVramAddress(addr, _console->GetPpu()->GetFrameCycle()) == A12StateChange::Rise) {
|
|
if(_irqEnabled && _irqEnabledAlt && _irqCounter) {
|
|
_irqCounter--;
|
|
if(_irqCounter == 0) {
|
|
_console->GetCpu()->SetIrqSource(IRQSource::External);
|
|
_irqEnabledAlt = false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void WriteRegister(uint16_t addr, uint8_t value) override
|
|
{
|
|
switch(addr) {
|
|
case 0x8000: case 0x8001: case 0x8002: case 0x8003:
|
|
SelectPRGPage(addr & 0x03, value );
|
|
break;
|
|
|
|
case 0xA000: case 0xA001: case 0xA002: case 0xA003:
|
|
case 0xA004: case 0xA005: case 0xA006: case 0xA007:
|
|
SelectCHRPage(addr & 0x07, value);
|
|
break;
|
|
|
|
case 0xC001: _irqReloadValue = value; break;
|
|
case 0xC002: _console->GetCpu()->ClearIrqSource(IRQSource::External); break;
|
|
|
|
case 0xC003:
|
|
_irqCounter = _irqReloadValue;
|
|
_irqEnabledAlt = true;
|
|
break;
|
|
|
|
case 0xD000: SetMirroringType(value & 0x01 ? MirroringType::Horizontal : MirroringType::Vertical); break;
|
|
|
|
case 0xE000:
|
|
_irqEnabled = (value & 0x01) == 0x01;
|
|
_console->GetCpu()->ClearIrqSource(IRQSource::External);
|
|
break;
|
|
}
|
|
}
|
|
}; |