mirror of
https://github.com/libretro/Mesen.git
synced 2024-11-24 09:39:44 +00:00
77 lines
1.9 KiB
C++
77 lines
1.9 KiB
C++
#pragma once
|
|
#include "stdafx.h"
|
|
#include "BaseMapper.h"
|
|
#include "CPU.h"
|
|
|
|
class IremH3001 : public BaseMapper
|
|
{
|
|
private:
|
|
bool _irqEnabled = false;
|
|
uint16_t _irqCounter = 0;
|
|
uint16_t _irqReloadValue = 0;
|
|
|
|
protected:
|
|
virtual uint16_t GetPRGPageSize() { return 0x2000; }
|
|
virtual uint16_t GetCHRPageSize() { return 0x400; }
|
|
|
|
void InitMapper()
|
|
{
|
|
SelectPRGPage(0, 0);
|
|
SelectPRGPage(1, 1);
|
|
SelectPRGPage(2, 0xFE);
|
|
SelectPRGPage(3, -1);
|
|
}
|
|
|
|
void StreamState(bool saving)
|
|
{
|
|
BaseMapper::StreamState(saving);
|
|
Stream<bool>(_irqEnabled);
|
|
Stream<uint16_t>(_irqCounter);
|
|
Stream<uint16_t>(_irqReloadValue);
|
|
}
|
|
|
|
virtual void ProcessCpuClock()
|
|
{
|
|
if(_irqEnabled) {
|
|
_irqCounter--;
|
|
if(_irqCounter == 0) {
|
|
_irqEnabled = false;
|
|
CPU::SetIRQSource(IRQSource::External);
|
|
}
|
|
}
|
|
}
|
|
|
|
void WriteRegister(uint16_t addr, uint8_t value)
|
|
{
|
|
switch(addr) {
|
|
case 0x8000: SelectPRGPage(0, value); break;
|
|
|
|
case 0x9001: SetMirroringType(value & 0x80 ? MirroringType::Horizontal : MirroringType::Vertical); break;
|
|
case 0x9003:
|
|
_irqEnabled = (value & 0x80) == 0x80;
|
|
CPU::ClearIRQSource(IRQSource::External);
|
|
break;
|
|
|
|
case 0x9004:
|
|
_irqCounter = _irqReloadValue;
|
|
CPU::ClearIRQSource(IRQSource::External);
|
|
break;
|
|
|
|
case 0x9005: _irqReloadValue = (_irqReloadValue & 0x00FF) | (value << 8); break;
|
|
case 0x9006: _irqReloadValue = (_irqReloadValue & 0xFF00) | value; break;
|
|
|
|
case 0xA000: SelectPRGPage(1, value); break;
|
|
|
|
case 0xB000: SelectCHRPage(0, value); break;
|
|
case 0xB001: SelectCHRPage(1, value); break;
|
|
case 0xB002: SelectCHRPage(2, value); break;
|
|
case 0xB003: SelectCHRPage(3, value); break;
|
|
case 0xB004: SelectCHRPage(4, value); break;
|
|
case 0xB005: SelectCHRPage(5, value); break;
|
|
case 0xB006: SelectCHRPage(6, value); break;
|
|
case 0xB007: SelectCHRPage(7, value); break;
|
|
|
|
case 0xC000: SelectPRGPage(2, value); break;
|
|
}
|
|
}
|
|
}; |