升壓序列化和文件IO是

Question

我做一個遊戲，並有加載3D模型的資源文件格式非常緩慢，紋理和網格等這樣的定義：

/* PackageHeader definition */ 
    struct PackageHeader 
    { 
     std::string mSignature; 
     uint8_t mMajorVersion; 
     uint8_t mMinorVersion; 


     PackageHeader(); 
    }; 

    /* PackageMesh definition */ 
    struct PackageMesh 
    { 
     std::vector<Vec3> mVertexData; 
     std::vector<Vec3> mNormalData; 
     std::vector<Vec2> mTexCoordsData; 
     std::vector<uint32_t> mIndiceData; 
     uint16_t mMaterialIndex; 
     bool mHasMaterial; 


     PackageMesh(); 
    }; 

    /* PackageTexture definition */ 
    struct PackageTexture 
    { 
     std::string mName; 
     std::vector<uint8_t> mTextureData; 
     uint32_t mTextureWidth;   // width/height in pixels 
     uint32_t mTextureHeight; 
     ITexture::TextureFormat mTextureFormat; 
     ITexture::TextureType mTextureType; 


     PackageTexture(); 
    }; 

    /* PackageMaterial definition */ 
    struct PackageMaterial 
    { 
     std::string mName; 
     PackageTexture mDiffuseTexture; 
     Vec3 mDiffuseColor; 
     Vec3 mAmbientColor; 
     Vec3 mSpecularColor; 
     Vec3 mEmissiveColor; 


     PackageMaterial(); 
    }; 

    /* PackageModel definition */ 
    struct PackageModel 
    { 
     std::string mName; 
     std::vector<PackageModel> mChildren; 
     std::vector<PackageMesh> mMeshes; 
     Mat4 mTransform; 


     PackageModel(); 
    }; 

    /* JonsPackage definition */ 
    struct JonsPackage 
    { 
     PackageHeader mHeader; 
     std::vector<PackageModel> mModels; 
     std::vector<PackageMaterial> mMaterials; 


     JonsPackage(); 
    }; 

我使用升壓序列化保存/從文件系統加載，直到現在一直是絕對令人驚歎的，因爲它幾乎不需要代碼來完成它。

但是進口一些3D模型，然後嘗試再次加載它之後，加載時間是巨大的;從文件系統加載到反序列化需要將近30秒的時間。

這是序列化的代碼/反序列化：

JonsPackagePtr ReadJonsPkg(const std::string& jonsPkgName) 
    { 
     std::ifstream jonsPkgStream(jonsPkgName.c_str(), std::ios::in | std::ios::binary);  // TODO: support opening of older resource packages 
     JonsPackagePtr pkg(HeapAllocator::GetDefaultHeapAllocator().AllocateObject<JonsPackage>(), boost::bind(&HeapAllocator::DeallocateObject<JonsPackage>, &HeapAllocator::GetDefaultHeapAllocator(), _1)); 

     if (jonsPkgStream && jonsPkgStream.good() && jonsPkgStream.is_open()) 
     { 
      std::stringstream buf(std::ios_base::binary | std::ios_base::in | std::ios_base::out); 
      buf << jonsPkgStream.rdbuf(); 
      buf.seekg(0); 
      jonsPkgStream.close(); 

      boost::archive::binary_iarchive iar(buf); 

      iar >> (*pkg.get()); 
     } 

     jonsPkgStream.close(); 

     return pkg; 
    } 

    bool WriteJonsPkg(const std::string& jonsPkgName, const JonsPackagePtr pkg) 
    { 
     std::ofstream outStream(jonsPkgName.c_str(), std::ios::out | std::ios::binary | std::ios::trunc); 
     bool ret = false; 

     if (outStream.is_open()) 
     { 
      boost::archive::binary_oarchive oar(outStream); 
      oar << (*pkg.get()); 

      ret = true; 
     } 

     return ret; 
    } 

這裏是VS2012性能analys的圖像： http://postimg.org/image/smdsnu5gl/

我使用的資源文件是上盤約26 MB，包含3個封裝模型和14個封裝紋理。我能做些什麼呢，我的文件格式設計是死衚衕嗎？

Answer 1

這只是26MB的時間太多。我看到你在VS2012中運行。我建議您嘗試在VS2012環境之外發布並運行該程序，只需直接從文件資源管理器中單擊您的.exe即可。

而且你不需要加載你的整個文件在內存中進行反序列化的內容。

您可以用下面的代碼試試：

std::ifstream file("path.dat"); 
boost::archive::binary_iarchive iar(file);