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https://github.com/libretro/Mesen.git
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116 lines
2.4 KiB
C++
116 lines
2.4 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 Mapper357 : public BaseMapper
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{
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private:
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const uint8_t _dipswitchLut[4] = {
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0x00, 0x08, 0x10, 0x18
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};
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const uint8_t bankLut[2][8] = {
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{ 4, 3, 5, 3, 6, 3, 7, 3 },
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{ 1, 1, 5, 1, 4, 1, 5, 1 }
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};
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uint16_t _irqCounter;
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bool _irqEnabled;
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uint8_t _smb2jReg;
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uint8_t _unromReg;
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bool _prgSwap;
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uint8_t _dipswitch;
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protected:
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uint16_t RegisterStartAddress() override { return 0x4020; }
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uint16_t RegisterEndAddress() override { return 0xFFFF; }
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uint16_t GetPRGPageSize() override { return 0x2000; }
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uint16_t GetCHRPageSize() override { return 0x2000; }
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uint32_t GetDipSwitchCount() override { return 2; }
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void InitMapper() override
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{
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_irqCounter = 0;
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_irqEnabled = false;
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_unromReg = 0;
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_smb2jReg = 0;
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_prgSwap = 0;
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UpdateState();
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}
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void Reset(bool softReset) override
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{
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_dipswitch = _dipswitchLut[GetDipSwitches() & 0x03];
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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 UpdateState()
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{
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if(_dipswitch == 0) {
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SetCpuMemoryMapping(0x6000, 0x7FFF, _prgSwap ? 0x00 : 0x02, PrgMemoryType::PrgRom);
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SelectPRGPage(0, _prgSwap ? 0x00 : 0x01);
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SelectPRGPage(1, 0x00);
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SelectPRGPage(2, bankLut[_prgSwap][_smb2jReg]);
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SelectPRGPage(3, _prgSwap ? 0x08 : 0x0A);
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} else {
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SelectPrgPage2x(0, (_dipswitch | _unromReg) << 1);
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SelectPrgPage2x(1, (_dipswitch | 0x07) << 1);
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}
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SelectCHRPage(0, 0);
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SetMirroringType((_dipswitch == 0x18) ? MirroringType::Horizontal : MirroringType::Vertical);
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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(_irqCounter, _irqEnabled, _unromReg, _smb2jReg, _prgSwap, _dipswitch);
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if(!saving) {
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UpdateState();
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}
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}
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void ProcessCpuClock() override
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{
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if(_irqEnabled) {
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_irqCounter++;
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if(_irqCounter == 0x1000) {
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_irqCounter = 0;
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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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if(addr & 0x8000) {
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_unromReg = value & 0x07;
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UpdateState();
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}
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if((addr & 0x71FF) == 0x4022) {
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_smb2jReg = value & 0x07;
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UpdateState();
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}
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if((addr & 0x71FF) == 0x4120) {
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_prgSwap = (value & 0x01) == 0x01;
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UpdateState();
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}
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if((addr & 0x71FF) == 0x4122) {
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_irqEnabled = (value & 0x01) == 0x01;
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_irqCounter = 0;
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_console->GetCpu()->ClearIrqSource(IRQSource::External);
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}
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}
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};
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