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58 lines
1.3 KiB
C++
58 lines
1.3 KiB
C++
#pragma once
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#include "pch.h"
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#include "NES/BaseMapper.h"
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class Mapper15 : public BaseMapper
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{
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protected:
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uint16_t GetPrgPageSize() override { return 0x2000; }
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uint16_t GetChrPageSize() override { return 0x2000; }
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void InitMapper() override
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{
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SelectChrPage(0, 0);
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}
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void Reset(bool softReset) override
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{
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WriteRegister(0x8000, 0);
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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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SetMirroringType(value & 0x40 ? MirroringType::Horizontal : MirroringType::Vertical);
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uint8_t subBank = value >> 7;
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uint8_t bank = (value & 0x7F) << 1;
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uint8_t mode = addr & 0x03;
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SetPpuMemoryMapping(0, 0x1FFF, 0, ChrMemoryType::Default, (mode == 0 || mode == 3) ? MemoryAccessType::Read : MemoryAccessType::ReadWrite);
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switch(mode) {
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case 0:
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SelectPrgPage(0, bank ^ subBank);
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SelectPrgPage(1, (bank + 1) ^ subBank);
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SelectPrgPage(2, (bank + 2) ^ subBank);
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SelectPrgPage(3, (bank + 3) ^ subBank);
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break;
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case 1:
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case 3:
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bank |= subBank;
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SelectPrgPage(0, bank);
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SelectPrgPage(1, bank + 1);
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bank = ((mode == 3) ? bank : (bank | 0x0E)) | subBank;
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SelectPrgPage(2, bank + 0);
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SelectPrgPage(3, bank + 1);
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break;
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case 2:
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bank |= subBank;
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SelectPrgPage(0, bank);
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SelectPrgPage(1, bank);
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SelectPrgPage(2, bank);
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SelectPrgPage(3, bank);
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break;
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}
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}
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};
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