mirror of
https://github.com/SourMesen/Mesen2.git
synced 2025-04-02 10:21:44 -04:00
66 lines
No EOL
1.7 KiB
C++
66 lines
No EOL
1.7 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/NesCpu.h"
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#include "NES/NesConsole.h"
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#include "NES/Mappers/A12Watcher.h"
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class Mapper222 : public BaseMapper
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{
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private:
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uint16_t _irqCounter = 0;
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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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_irqCounter = 0;
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SelectPrgPage2x(1, -2);
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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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}
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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(_irqCounter) {
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_irqCounter++;
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if(_irqCounter >= 240) {
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_console->GetCpu()->SetIrqSource(IRQSource::External);
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_irqCounter = 0;
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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 & 0xF003) {
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case 0x8000: SelectPrgPage(0, value); break;
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case 0x9000: SetMirroringType(value & 0x01 ? MirroringType::Horizontal : MirroringType::Vertical); 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 0xB002: SelectChrPage(1, value); break;
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case 0xC000: SelectChrPage(2, value); break;
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case 0xC002: SelectChrPage(3, value); break;
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case 0xD000: SelectChrPage(4, value); break;
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case 0xD002: SelectChrPage(5, value); break;
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case 0xE000: SelectChrPage(6, value); break;
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case 0xE002: SelectChrPage(7, value); break;
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case 0xF000:
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_irqCounter = value;
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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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}; |