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106 lines
2.7 KiB
C++
106 lines
2.7 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "MMC3.h"
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//Mostly taken from FCEUX's code
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class MMC3_Coolboy : public MMC3
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{
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private:
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uint8_t _exRegs[4];
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protected:
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uint16_t RegisterStartAddress() override { return 0x6000; }
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uint32_t GetChrRamSize() override { return 0x40000; }
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void Reset(bool softReset) override
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{
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memset(_exRegs, 0, sizeof(_exRegs));
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BaseMapper::Reset(softReset);
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MMC3::ResetMmc3();
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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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MMC3::StreamState(saving);
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Stream(_exRegs[0], _exRegs[1], _exRegs[2], _exRegs[3]);
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}
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void SelectCHRPage(uint16_t slot, uint16_t page, ChrMemoryType memoryType = ChrMemoryType::Default) override
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{
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uint16_t addr = slot * 0x400;
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uint32_t mask = 0xFF ^ (_exRegs[0] & 0x80);
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int cbase = _chrMode ? 0x1000 : 0;
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if(_exRegs[3] & 0x10) {
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if(_exRegs[3] & 0x40) {
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switch(cbase ^ addr) {
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case 0x0400:
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case 0x0C00: page &= 0x7F; break;
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}
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}
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MMC3::SelectCHRPage(slot,
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(page & 0x80 & mask) | ((((_exRegs[0] & 0x08) << 4) & ~mask))
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| ((_exRegs[2] & 0x0F) << 3)
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| slot
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);
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} else {
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if(_exRegs[3] & 0x40) {
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switch(cbase ^ addr) {
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case 0x0000: page = _registers[0]; break;
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case 0x0800: page = _registers[1]; break;
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case 0x0400:
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case 0x0C00: page = 0; break;
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}
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}
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MMC3::SelectCHRPage(slot, (page & mask) | (((_exRegs[0] & 0x08) << 4) & ~mask));
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}
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}
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void SelectPRGPage(uint16_t slot, uint16_t page, PrgMemoryType memoryType = PrgMemoryType::PrgRom) override
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{
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uint16_t addr = 0x8000 + slot * 0x2000;
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uint32_t mask = ((0x3F | (_exRegs[1] & 0x40) | ((_exRegs[1] & 0x20) << 2)) ^ ((_exRegs[0] & 0x40) >> 2)) ^ ((_exRegs[1] & 0x80) >> 2);
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uint32_t base = ((_exRegs[0] & 0x07) >> 0) | ((_exRegs[1] & 0x10) >> 1) | ((_exRegs[1] & 0x0C) << 2) | ((_exRegs[0] & 0x30) << 2);
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if((_exRegs[3] & 0x40) && (page >= 0xFE) && _prgMode) {
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switch(slot) {
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case 1: if(_prgMode) page = 0; break;
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case 2: if(!_prgMode) page = 0; break;
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case 3: page = 0; break;
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}
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}
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if(!(_exRegs[3] & 0x10)) {
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MMC3::SelectPRGPage(slot, (((base << 4) & ~mask)) | (page & mask));
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} else {
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mask &= 0xF0;
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uint8_t emask;
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if((((_exRegs[1] & 0x02) != 0))) {
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emask = (_exRegs[3] & 0x0C) | ((addr & 0x4000) >> 13);
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} else {
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emask = _exRegs[3] & 0x0E;
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}
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MMC3::SelectPRGPage(slot, ((base << 4) & ~mask) | (page & mask) | emask | (slot & 0x01));
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}
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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 < 0x8000) {
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if(GetState().RegA001 & 0x80) {
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WritePrgRam(addr, value);
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}
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if((_exRegs[3] & 0x90) != 0x80) {
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_exRegs[addr & 0x03] = value;
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UpdateState();
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}
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} else {
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MMC3::WriteRegister(addr, value);
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}
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}
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}; |