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35 lines
961 B
C++
35 lines
961 B
C++
#pragma once
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#include "BaseMapper.h"
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class Mapper218 : public BaseMapper
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{
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protected:
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uint16_t GetPRGPageSize() { return 0x8000; }
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uint16_t GetCHRPageSize() { return 0x2000; }
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void InitMapper()
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{
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SelectPRGPage(0, 0);
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if(GetMirroringType() == MirroringType::FourScreens) {
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SetMirroringType(_nesHeader.Byte6 & 0x01 ? MirroringType::ScreenBOnly : MirroringType::ScreenAOnly);
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}
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}
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void SetDefaultNametables(uint8_t* nametableA, uint8_t* nametableB)
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{
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BaseMapper::SetDefaultNametables(nametableA, nametableB);
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uint16_t mask = 0;
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switch(GetMirroringType()) {
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case MirroringType::Vertical: mask = 0x400; break;
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case MirroringType::Horizontal: mask = 0x800; break;
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case MirroringType::ScreenAOnly: mask = 0x1000; break;
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case MirroringType::ScreenBOnly: mask = 0x2000; break;
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}
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for(int i = 0; i < 8; i++) {
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SetPpuMemoryMapping(i * 0x400, i * 0x400 + 0x3FF, (i * 0x400) & mask ? GetNametable(1) : GetNametable(0));
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}
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}
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}; |