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https://github.com/NovaSquirrel/Mesen-X.git
synced 2024-05-31 18:38:15 -04:00
63 lines
1.6 KiB
C++
63 lines
1.6 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "MMC3.h"
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class Mapper112 : public BaseMapper
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{
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private:
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uint8_t _currentReg;
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uint8_t _outerChrBank;
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uint8_t _registers[8];
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protected:
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uint16_t RegisterStartAddress() override { return 0x8000; }
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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 0x400; }
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void InitMapper() override
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{
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_currentReg = 0;
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_outerChrBank = 0;
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memset(_registers, 0, sizeof(_registers));
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SetMirroringType(MirroringType::Vertical);
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AddRegisterRange(0x4020, 0x5FFF, MemoryOperation::Write);
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SelectPRGPage(2, -2);
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SelectPRGPage(3, -1);
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UpdateState();
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}
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void StreamState(bool saving) override
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{
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ArrayInfo<uint8_t> registers { _registers, 8 };
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Stream(registers, _currentReg, _outerChrBank);
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}
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void UpdateState()
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{
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SelectPRGPage(0, _registers[0]);
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SelectPRGPage(1, _registers[1]);
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SelectChrPage2x(0, _registers[2]);
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SelectChrPage2x(1, _registers[3]);
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SelectCHRPage(4, _registers[4] | ((_outerChrBank & 0x10) << 4));
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SelectCHRPage(5, _registers[5] | ((_outerChrBank & 0x20) << 3));
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SelectCHRPage(6, _registers[6] | ((_outerChrBank & 0x40) << 2));
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SelectCHRPage(7, _registers[7] | ((_outerChrBank & 0x80) << 1));
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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 & 0xE001) {
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case 0x8000: _currentReg = value & 0x07; break;
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case 0xA000: _registers[_currentReg] = value; break;
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case 0xC000: _outerChrBank = value; break;
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case 0xE000: SetMirroringType(value & 0x01 ? MirroringType::Horizontal : MirroringType::Vertical); break;
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}
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UpdateState();
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}
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}; |