mirror of
https://github.com/SourMesen/Mesen.git
synced 2024-05-20 05:01:03 -04:00
73 lines
1.6 KiB
C++
73 lines
1.6 KiB
C++
#pragma once
|
|
#include "stdafx.h"
|
|
#include "BaseMapper.h"
|
|
#include "A12Watcher.h"
|
|
#include "CPU.h"
|
|
|
|
class Mapper35 : public BaseMapper
|
|
{
|
|
private:
|
|
uint8_t _irqCounter;
|
|
bool _irqEnabled;
|
|
A12Watcher _a12Watcher;
|
|
|
|
protected:
|
|
virtual uint16_t GetPRGPageSize() override { return 0x2000; }
|
|
virtual uint16_t GetCHRPageSize() override { return 0x0400; }
|
|
|
|
void InitMapper() override
|
|
{
|
|
_irqEnabled = false;
|
|
_irqCounter = 0;
|
|
|
|
SelectPRGPage(3, -1);
|
|
}
|
|
|
|
void StreamState(bool saving) override
|
|
{
|
|
BaseMapper::StreamState(saving);
|
|
SnapshotInfo a12Watcher{ &_a12Watcher };
|
|
Stream(_irqCounter, _irqEnabled, a12Watcher);
|
|
}
|
|
|
|
void WriteRegister(uint16_t addr, uint8_t value) override
|
|
{
|
|
switch(addr & 0xF007) {
|
|
case 0x8000: case 0x8001: case 0x8002: case 0x8003:
|
|
SelectPRGPage(addr & 0x03, value);
|
|
break;
|
|
|
|
case 0x9000: case 0x9001: case 0x9002: case 0x9003:
|
|
case 0x9004: case 0x9005: case 0x9006: case 0x9007:
|
|
SelectCHRPage(addr & 0x07, value);
|
|
break;
|
|
|
|
case 0xC002:
|
|
_irqEnabled = false;
|
|
_console->GetCpu()->ClearIrqSource(IRQSource::External);
|
|
break;
|
|
|
|
case 0xC003: _irqEnabled = true; break;
|
|
case 0xC005: _irqCounter = value; break;
|
|
|
|
case 0xD001:
|
|
SetMirroringType(value & 0x01 ? MirroringType::Horizontal : MirroringType::Vertical);
|
|
break;
|
|
}
|
|
}
|
|
|
|
virtual void NotifyVRAMAddressChange(uint16_t addr) override
|
|
{
|
|
//MMC3-style A12 IRQ counter
|
|
if(_a12Watcher.UpdateVramAddress(addr, _console->GetPpu()->GetFrameCycle()) == A12StateChange::Rise) {
|
|
if(_irqEnabled) {
|
|
_irqCounter--;
|
|
if(_irqCounter == 0) {
|
|
_irqEnabled = false;
|
|
_console->GetCpu()->SetIrqSource(IRQSource::External);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
};
|