106 lines
2.2 KiB
C++
106 lines
2.2 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "ROMLoader.h"
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#include "IMemoryHandler.h"
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class BaseMapper : public IMemoryHandler
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{
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protected:
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NESHeader _header;
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vector<MemoryBank> _romBanks;
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vector<MemoryBank> _vromBanks;
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virtual void InitMapper() = 0;
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public:
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void Initialize(NESHeader header, vector<MemoryBank> romBanks, vector<MemoryBank> vromBanks)
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{
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_header = header;
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_romBanks = romBanks;
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_vromBanks = vromBanks;
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InitMapper();
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}
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const NESHeader GetHeader()
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{
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return _header;
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}
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};
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class DefaultMapper : public BaseMapper
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{
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vector<MemoryBank*> _mappedRomBanks;
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MemoryBank *_mappedVromBank;
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private:
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void InitMapper()
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{
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if(_romBanks.size() == 1) {
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_mappedRomBanks = { &_romBanks[0], &_romBanks[0] };
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} else {
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_mappedRomBanks = { &_romBanks[0], &_romBanks[1] };
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}
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if(_vromBanks.size() == 0) {
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uint8_t *buffer = new uint8_t[ROMLoader::VROMBankSize];
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_vromBanks.push_back(MemoryBank(buffer, buffer + ROMLoader::VROMBankSize));
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}
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_mappedVromBank = &_vromBanks[0];
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}
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public:
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vector<std::array<uint16_t, 2>> GetRAMAddresses()
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{
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return { { { 0x8000, 0xFFFF } } };
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}
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vector<std::array<uint16_t, 2>> GetVRAMAddresses()
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{
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return { { { 0x0000, 0x1FFF } } };
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}
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uint8_t ReadRAM(uint16_t addr)
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{
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return (*_mappedRomBanks[(addr >> 14) & 0x01])[addr & 0x3FFF];
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}
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void WriteRAM(uint16_t addr, uint8_t value)
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{
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(*_mappedRomBanks[(addr >> 14) & 0x01])[addr & 0x3FFF] = value;
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}
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uint8_t ReadVRAM(uint16_t addr)
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{
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return (*_mappedVromBank)[addr & 0x1FFF];
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}
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void WriteVRAM(uint16_t addr, uint8_t value)
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{
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(*_mappedVromBank)[addr & 0x1FFF] = value;
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}
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};
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class MapperFactory
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{
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public:
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static unique_ptr<BaseMapper> InitializeFromFile(wstring filename)
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{
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ROMLoader loader(filename);
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NESHeader header = loader.GetHeader();
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uint8_t mapperID = header.GetMapperID();
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unique_ptr<BaseMapper> mapper = nullptr;
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switch(mapperID) {
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case 0: mapper = unique_ptr<BaseMapper>(new DefaultMapper()); break;
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}
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if(!mapper) {
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throw std::exception("Unsupported mapper");
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}
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mapper->Initialize(header, loader.GetROMBanks(), loader.GetVROMBanks());
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return mapper;
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}
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};
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