mirror of
https://github.com/SourMesen/Mesen2.git
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90 lines
No EOL
2.2 KiB
C++
90 lines
No EOL
2.2 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/NesConsole.h"
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#include "NES/NesCpu.h"
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class Kaiser7017 : public BaseMapper
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{
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uint8_t _prgReg = 0;
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MirroringType _mirroring = {};
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uint16_t _irqCounter = 0;
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bool _irqEnabled = false;
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protected:
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uint16_t GetPrgPageSize() override { return 0x4000; }
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uint16_t GetChrPageSize() override { return 0x2000; }
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bool AllowRegisterRead() override { return true; }
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uint16_t RegisterStartAddress() override { return 0x4020; }
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uint16_t RegisterEndAddress() override { return 0x5FFF; }
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bool EnableCpuClockHook() override { return true; }
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void InitMapper() override
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{
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RemoveRegisterRange(0x4020, 0x5FFF, MemoryOperation::Read);
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AddRegisterRange(0x4030, 0x4030, MemoryOperation::Read);
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SelectChrPage(0, 0);
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_prgReg = 0;
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_mirroring = MirroringType::Vertical;
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_irqCounter = 0;
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_irqEnabled = false;
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UpdateState();
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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(_prgReg);
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SV(_mirroring);
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SV(_irqCounter);
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SV(_irqEnabled);
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}
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void UpdateState()
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{
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SelectPrgPage(0, _prgReg);
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SelectPrgPage(1, 2);
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SetMirroringType(_mirroring);
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}
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void ProcessCpuClock() override
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{
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BaseProcessCpuClock();
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if(_irqEnabled && _irqCounter) {
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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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uint8_t ReadRegister(uint16_t addr) override
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{
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bool irqPending = _console->GetCpu()->HasIrqSource(IRQSource::External);
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_console->GetCpu()->ClearIrqSource(IRQSource::External);
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return irqPending ? 0x01 : 0x00;
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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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if((addr & 0xFF00) == 0x4A00) {
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_prgReg = ((addr >> 2) & 0x03) | ((addr >> 4) & 0x04);
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} else if((addr & 0xFF00) == 0x5100) {
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UpdateState();
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} else if(addr == 0x4020) {
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_console->GetCpu()->ClearIrqSource(IRQSource::External);
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_irqCounter = (_irqCounter & 0xFF00) | value;
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} else if(addr == 0x4021) {
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_console->GetCpu()->ClearIrqSource(IRQSource::External);
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_irqCounter = (_irqCounter & 0xFF) | (value << 8);
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_irqEnabled = true;
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} else if(addr == 0x4025) {
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_mirroring = ((value >> 3) & 0x01) ? MirroringType::Horizontal : MirroringType::Vertical;
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}
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}
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}; |