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53 lines
1.1 KiB
C++
53 lines
1.1 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "BaseMapper.h"
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class Mapper57 : public BaseMapper
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{
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private:
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uint8_t _registers[2];
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protected:
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virtual uint16_t GetPRGPageSize() { return 0x4000; }
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virtual uint16_t GetCHRPageSize() { return 0x2000; }
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void InitMapper()
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{
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_registers[0] = 0;
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_registers[1] = 0;
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UpdateState();
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}
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void StreamState(bool saving)
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{
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BaseMapper::StreamState(saving);
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Stream(_registers[0], _registers[1]);
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}
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void UpdateState()
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{
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SetMirroringType(_registers[1] & 0x08 ? MirroringType::Horizontal : MirroringType::Vertical);
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SelectCHRPage(0, ((_registers[0] & 0x40) >> 3) | ((_registers[0] | _registers[1]) & 0x07));
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if(_registers[1] & 0x10) {
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SelectPRGPage(0, (_registers[1] >> 5) & 0x06);
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SelectPRGPage(1, ((_registers[1] >> 5) & 0x06) + 1);
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} else {
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SelectPRGPage(0, (_registers[1] >> 5) & 0x07);
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SelectPRGPage(1, (_registers[1] >> 5) & 0x07);
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}
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}
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void WriteRegister(uint16_t addr, uint8_t value)
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{
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switch(addr & 0x8800) {
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case 0x8000: _registers[0] = value; break;
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case 0x8800: _registers[1] = value; break;
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}
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UpdateState();
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}
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};
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