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