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fixed ppu postfetching

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Lauchmelder 2022-03-05 17:14:07 +01:00
parent a7808815a1
commit ca3eac8393
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GPG key ID: C2403C69D78F011D
17 changed files with 343 additions and 31 deletions
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48
src/mappers/Mapper003.cpp Normal file
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#include "Mapper003.hpp"
#include <fstream>
#include "../Log.hpp"
Mapper003::Mapper003(const Header& header, std::ifstream& ifs) :
Mapper(header)
{
LOG_CORE_INFO("Allocating PRG ROM");
PRG_ROM = std::vector<Byte>(0x4000 * prgBanks);
ifs.read((char*)PRG_ROM.data(), 0x4000 * prgBanks);
LOG_CORE_INFO("Allocating CHR ROM");
CHR_ROM = std::vector<Byte>(0x2000 * chrBanks);
ifs.read((char*)CHR_ROM.data(), 0x2000 * chrBanks);
}
Byte Mapper003::ReadCPU(Word addr)
{
if (0x8000 <= addr && addr <= 0xFFFF)
{
return PRG_ROM[addr & (0x4000 * prgBanks - 1)];
}
return 0x00;
}
Byte Mapper003::ReadPPU(Word addr)
{
if (0x0000 <= addr && addr <= 0x1FFF)
{
return CHR_ROM[0x2000 * selectedChrBank + addr];
}
return 0x00;
}
void Mapper003::WriteCPU(Word addr, Byte val)
{
if (0x8000 <= addr && addr <= 0xFFFF)
{
selectedChrBank = val & 0x3;
}
}
void Mapper003::WritePPU(Word addr, Byte val)
{
}