mirror of
https://github.com/SourMesen/Mesen2.git
synced 2025-04-02 10:21:44 -04:00
81 lines
No EOL
1.9 KiB
C++
81 lines
No EOL
1.9 KiB
C++
#pragma once
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#include "pch.h"
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#include "NES/BaseMapper.h"
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#include "NES/Mappers/A12Watcher.h"
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class Mapper117 : public BaseMapper
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{
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private:
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uint8_t _irqCounter = 0;
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uint8_t _irqReloadValue = 0;
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bool _irqEnabled = false;
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bool _irqEnabledAlt = false;
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A12Watcher _a12Watcher;
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protected:
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uint16_t GetPrgPageSize() override { return 0x2000; }
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uint16_t GetChrPageSize() override { return 0x400; }
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bool EnableVramAddressHook() override { return true; }
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void InitMapper() override
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{
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_irqEnabled = false;
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_irqEnabledAlt = false;
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_irqCounter = 0;
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_irqReloadValue = 0;
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SelectPrgPage4x(0, -4);
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}
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void Serialize(Serializer& s) override
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{
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BaseMapper::Serialize(s);
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SV(_a12Watcher);
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SV(_irqCounter);
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SV(_irqEnabled);
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SV(_irqEnabledAlt);
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SV(_irqReloadValue);
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}
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void NotifyVramAddressChange(uint16_t addr) override
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{
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if(_a12Watcher.UpdateVramAddress(addr, _console->GetPpu()->GetFrameCycle()) == A12StateChange::Rise) {
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if(_irqEnabled && _irqEnabledAlt && _irqCounter) {
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_irqCounter--;
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if(_irqCounter == 0) {
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_console->GetCpu()->SetIrqSource(IRQSource::External);
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_irqEnabledAlt = false;
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}
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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: case 0x8001: case 0x8002: case 0x8003:
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SelectPrgPage(addr & 0x03, value);
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break;
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case 0xA000: case 0xA001: case 0xA002: case 0xA003:
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case 0xA004: case 0xA005: case 0xA006: case 0xA007:
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SelectChrPage(addr & 0x07, value);
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break;
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case 0xC001: _irqReloadValue = value; break;
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case 0xC002: _console->GetCpu()->ClearIrqSource(IRQSource::External); break;
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case 0xC003:
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_irqCounter = _irqReloadValue;
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_irqEnabledAlt = true;
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break;
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case 0xD000: SetMirroringType(value & 0x01 ? MirroringType::Horizontal : MirroringType::Vertical); break;
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case 0xE000:
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_irqEnabled = (value & 0x01) == 0x01;
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_console->GetCpu()->ClearIrqSource(IRQSource::External);
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break;
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}
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}
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}; |