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https://github.com/SourMesen/Mesen.git
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90 lines
2.4 KiB
C++
90 lines
2.4 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "MMC3.h"
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class MMC3_14 : public MMC3
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{
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private:
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uint8_t _vrcChrRegs[8];
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uint8_t _vrcPrgRegs[2];
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uint8_t _vrcMirroring;
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uint8_t _mode;
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protected:
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virtual void InitMapper() override
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{
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_mode = 0;
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_vrcMirroring = 0;
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memset(_vrcPrgRegs, 0, sizeof(_vrcPrgRegs));
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memset(_vrcChrRegs, 0, sizeof(_vrcChrRegs));
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MMC3::InitMapper();
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}
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virtual void StreamState(bool saving) override
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{
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MMC3::StreamState(saving);
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ArrayInfo<uint8_t> prgRegs{ _vrcPrgRegs, 2 };
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ArrayInfo<uint8_t> chrRegs{ _vrcChrRegs, 8 };
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Stream(_mode, _vrcMirroring, prgRegs, chrRegs);
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}
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void UpdateChrMapping() override
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{
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int slotSwap = (GetState().Reg8000 & 0x80) ? 4 : 0;
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int outerBank0 = (_mode & 0x08) ? 0x100 : 0;
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int outerBank1 = (_mode & 0x20) ? 0x100 : 0;
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int outerBank2 = (_mode & 0x80) ? 0x100 : 0;
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SelectCHRPage(0 ^ slotSwap, outerBank0 | (_registers[0] & (~1)));
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SelectCHRPage(1 ^ slotSwap, outerBank0 | _registers[0] | 1);
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SelectCHRPage(2 ^ slotSwap, outerBank0 | (_registers[1] & (~1)));
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SelectCHRPage(3 ^ slotSwap, outerBank0 | _registers[1] | 1);
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SelectCHRPage(4 ^ slotSwap, outerBank1 | _registers[2]);
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SelectCHRPage(5 ^ slotSwap, outerBank1 | _registers[3]);
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SelectCHRPage(6 ^ slotSwap, outerBank2 | _registers[4]);
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SelectCHRPage(7 ^ slotSwap, outerBank2 | _registers[5]);
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}
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void UpdateVrcState()
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{
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SelectPRGPage(0, _vrcPrgRegs[0]);
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SelectPRGPage(1, _vrcPrgRegs[1]);
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SelectPRGPage(2, -2);
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SelectPRGPage(3, -1);
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for(int i = 0; i < 8; i++) {
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SelectCHRPage(i, _vrcChrRegs[i]);
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}
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SetMirroringType(_vrcMirroring & 0x01 ? MirroringType::Horizontal : MirroringType::Vertical);
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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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if(addr == 0xA131) {
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_mode = value;
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}
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if(_mode & 0x02) {
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MMC3::UpdateState();
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MMC3::WriteRegister(addr, value);
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} else {
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if(addr >= 0xB000 && addr <= 0xEFFF) {
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uint8_t regNumber = ((((addr >> 12) & 0x07) - 3) << 1) + ((addr >> 1) & 0x01);
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bool lowBits = (addr & 0x01) == 0x00;
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if(lowBits) {
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_vrcChrRegs[regNumber] = (_vrcChrRegs[regNumber] & 0xF0) | (value & 0x0F);
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} else {
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_vrcChrRegs[regNumber] = (_vrcChrRegs[regNumber] & 0x0F) | ((value & 0x0F) << 4);
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}
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} else {
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switch(addr & 0xF003) {
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case 0x8000: _vrcPrgRegs[0] = value; break;
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case 0x9000: _vrcMirroring = value; break;
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case 0xA000: _vrcPrgRegs[1] = value; break;
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}
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}
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UpdateVrcState();
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}
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}
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}; |