rnes/memory.cpp at master · mindbeast/rnes · GitHub

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#include "memory.h"
#include "mmc.h"
#include "save.pb.h"

namespace Rnes {

uint8_t CpuMemory::load(uint16_t addr) const {
  if (addr < cpuSramSize) {
    return cpuSram[addr];
  } else if ((addr >= prgSramBase) and (addr < prgSramBase + prgSramSize) and
             mmc->isPrgSramEnabled()) {
    return prgSram[addr - prgSramBase];
  } else {
    return mmc->cpuMemRead(addr);
  }
}

void CpuMemory::store(uint16_t addr, uint8_t data) {
  if (addr < cpuSramSize) {
    cpuSram[addr] = data;
  } else if ((addr >= prgSramBase) and (addr < prgSramBase + prgSramSize) and
             mmc->isPrgSramWriteable()) {
    prgSram[addr - prgSramBase] = data;
  } else {
    mmc->cpuMemWrite(addr, data);
  }
}

void CpuMemory::save(CpuMemoryState &pb) {
  pb.set_cpusram(cpuSram, cpuSramSize);
  pb.set_prgsram(prgSram, prgSramSize);
}

void CpuMemory::restore(const CpuMemoryState &pb) {
  const std::string &bytes = pb.cpusram();
  for (unsigned i = 0; i < bytes.size(); i++) {
    cpuSram[i] = bytes[i];
  }

  const std::string &prgBytes = pb.prgsram();
  for (unsigned i = 0; i < prgBytes.size(); i++) {
    prgSram[i] = prgBytes[i];
  }
}

uint8_t VideoMemory::load(uint16_t addr) const {
  if (addr >= 0x2000 and addr < 0x2000 + 0x1000) {
    addr = mmc->vidAddrTranslate(addr);
    return nameTableMemory[addr - 0x2000];
  } else if (addr >= 0x3f00 and addr <= 0x3f1f) {
    return paletteMemory[addr - 0x3f00];
  } else {
    return mmc->vidMemRead(addr);
  }
}

void VideoMemory::store(uint16_t addr, uint8_t data) {
  if (addr >= 0x2000 and addr < 0x2000 + 0x1000) {
    nameTableMemory[addr - 0x2000] = data;
  } else if (addr >= 0x3f00 and addr <= 0x3f1f) {
    paletteMemory[addr - 0x3f00] = data;
  } else {
    mmc->vidMemWrite(addr, data);
  }
}

void VideoMemory::save(VideoMemoryState &pb) {
  pb.set_patterntablememory(patternTableMemory, patternTableSize);
  pb.set_nametablememory(nameTableMemory, nameTableMemorySize);
  pb.set_palettememory(paletteMemory, paletteSize);
}

void VideoMemory::restore(const VideoMemoryState &pb) {
  {
    const std::string &bytes = pb.patterntablememory();
    for (unsigned i = 0; i < bytes.size(); i++) {
      patternTableMemory[i] = bytes[i];
    }
  }
  {
    const std::string &bytes = pb.nametablememory();
    for (unsigned i = 0; i < bytes.size(); i++) {
      nameTableMemory[i] = bytes[i];
    }
  }
  {
    const std::string &bytes = pb.palettememory();
    for (unsigned i = 0; i < bytes.size(); i++) {
      paletteMemory[i] = bytes[i];
    }
  }
}

} // namespace Rnes