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https://github.com/SourMesen/Mesen2.git
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68 lines
No EOL
1.8 KiB
C++
68 lines
No EOL
1.8 KiB
C++
#pragma once
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#include "pch.h"
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#include "NES/Mappers/Nintendo/MMC3.h"
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class MMC3_199 : public MMC3
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{
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private:
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uint8_t _exRegs[4] = {};
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protected:
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uint32_t GetChrRamSize() override { return 0x2000; }
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uint16_t GetChrRamPageSize() override { return 0x400; }
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void InitMapper() override
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{
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_exRegs[0] = 0xFE;
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_exRegs[1] = 0xFF;
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_exRegs[2] = 1;
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_exRegs[3] = 3;
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MMC3::InitMapper();
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}
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void Serialize(Serializer& s) override
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{
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MMC3::Serialize(s);
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SVArray(_exRegs, 4);
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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 == 0x8001 && (GetState().Reg8000 & 0x08)) {
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_exRegs[GetState().Reg8000 & 0x03] = value;
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UpdatePrgMapping();
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UpdateChrMapping();
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} else {
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MMC3::WriteRegister(addr, value);
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}
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}
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void UpdateMirroring() override
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{
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switch(GetState().RegA000 & 0x03) {
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case 0: SetMirroringType(MirroringType::Vertical); break;
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case 1: SetMirroringType(MirroringType::Horizontal); break;
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case 2: SetMirroringType(MirroringType::ScreenAOnly); break;
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case 3: SetMirroringType(MirroringType::ScreenBOnly); break;
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}
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}
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void UpdatePrgMapping() override
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{
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MMC3::UpdatePrgMapping();
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SelectPrgPage(2, _exRegs[0]);
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SelectPrgPage(3, _exRegs[1]);
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}
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void SelectChrPage(uint16_t slot, uint16_t page, ChrMemoryType memoryType) override
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{
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MMC3::SelectChrPage(slot, page, page < 8 ? ChrMemoryType::ChrRam : ChrMemoryType::ChrRom);
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MMC3::SelectChrPage(0, _registers[0], _registers[0] < 8 ? ChrMemoryType::ChrRam : ChrMemoryType::ChrRom);
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MMC3::SelectChrPage(1, _exRegs[2], _exRegs[2] < 8 ? ChrMemoryType::ChrRam : ChrMemoryType::ChrRom);
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MMC3::SelectChrPage(2, _registers[1], _registers[1] < 8 ? ChrMemoryType::ChrRam : ChrMemoryType::ChrRom);
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MMC3::SelectChrPage(3, _exRegs[3], _exRegs[3] < 8 ? ChrMemoryType::ChrRam : ChrMemoryType::ChrRom);
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}
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}; |