54 lines
1,006 B
C
54 lines
1,006 B
C
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#pragma once
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#include "stdafx.h"
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#include "BaseMapper.h"
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class Bmc80013B : public BaseMapper
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{
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private:
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uint8_t _regs[2];
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uint8_t _mode;
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protected:
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uint16_t GetPRGPageSize() override { return 0x4000; }
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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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_regs[0] = _regs[1] = _mode = 0;
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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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Stream(_regs[0], _regs[1], _mode);
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}
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void UpdateState()
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{
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if(_mode & 0x02) {
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SelectPRGPage(0, (_regs[0] & 0x0F) | (_regs[1] & 0x70));
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} else {
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SelectPRGPage(0, _regs[0] & 0x03);
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}
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SelectPRGPage(1, _regs[1] & 0x7F);
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SetMirroringType(_regs[0] & 0x10 ? MirroringType::Vertical : MirroringType::Horizontal);
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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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uint8_t reg = (addr >> 13) & 0x03;
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if(reg == 0) {
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_regs[0] = value;
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} else {
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_regs[1] = value;
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_mode = reg;
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}
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UpdateState();
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}
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};
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