mirror of
https://github.com/NovaSquirrel/Mesen-X.git
synced 2024-06-01 02:48:18 -04:00
ae2f365a50
- Rewite and update Mapper 226 and Mapper 233 - Fix BMC-Ghostbusters63in1 by changing it to Mapper 226 - Change BMC-42in1ResetSwitch from mapper 226 to Mapper 233, fixes switching menu listings from 20-in-1 to 22-in-1 on softreset.
73 lines
1.4 KiB
C++
73 lines
1.4 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "BaseMapper.h"
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// NES Mapper 226
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// UNIF BMC-Ghostbusters63in1
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class Mapper226 : public BaseMapper
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{
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protected:
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uint8_t _registers[2];
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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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_registers[0] = 0;
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_registers[1] = 0;
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}
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void StreamState(bool saving) override
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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 Reset(bool softReset) override
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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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uint8_t GetPrgPage()
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{
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const uint8_t banks[4] = { 0, 0, 1, 2 };
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uint8_t base = ((_registers[0] & 0x80) >> 7) | ((_registers[1] & 0x01) << 1);
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if(_prgSize == (1536 * 1024)) { // for 1536 KB PRG roms / BMC-Ghostbusters63in1
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base = banks[base];
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}
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return (_registers[0] & 0x1F) | (base << 5);
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}
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void UpdateState()
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{
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uint8_t prgPage = GetPrgPage();
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if(_registers[0] & 0x20) {
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SelectPRGPage(0, prgPage);
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SelectPRGPage(1, prgPage);
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} else {
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SelectPRGPage(0, prgPage & 0xFE);
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SelectPRGPage(1, (prgPage & 0xFE) + 1);
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}
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SelectCHRPage(0, 0);
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SetMirroringType(_registers[0] & 0x40 ? 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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_registers[addr & 0x01] = value;
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UpdateState();
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}
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};
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