Method Load

src/common/Misc/DDSLoader.cpp:109–187

}

bool DDSLoader::Load(const char *pFilename, float cutOff, IMG_INFO *pInfo)
{
    typedef enum RESOURCE_DIMENSION
    {
        RESOURCE_DIMENSION_UNKNOWN = 0,
        RESOURCE_DIMENSION_BUFFER = 1,
        RESOURCE_DIMENSION_TEXTURE1D = 2,
        RESOURCE_DIMENSION_TEXTURE2D = 3,
        RESOURCE_DIMENSION_TEXTURE3D = 4
    } RESOURCE_DIMENSION;

    typedef struct
    {
        DXGI_FORMAT      dxgiFormat;
        RESOURCE_DIMENSION  resourceDimension;
        UINT32           miscFlag;
        UINT32           arraySize;
        UINT32           reserved;
    } DDS_HEADER_DXT10;

    if (GetFileAttributesA(pFilename) == 0xFFFFFFFF)
        return false;

    m_handle = CreateFileA(pFilename, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (m_handle == INVALID_HANDLE_VALUE)
    {
        return false;
    }

    LARGE_INTEGER largeFileSize;
    GetFileSizeEx(m_handle, &largeFileSize);
    assert(0 == largeFileSize.HighPart);
    UINT32 fileSize = largeFileSize.LowPart;
    UINT32 rawTextureSize = fileSize;

    // read the header
    char headerData[4 + sizeof(DDS_HEADER) + sizeof(DDS_HEADER_DXT10)];
    DWORD dwBytesRead = 0;
    if (ReadFile(m_handle, headerData, 4 + sizeof(DDS_HEADER) + sizeof(DDS_HEADER_DXT10), &dwBytesRead, NULL))
    {
        char *pByteData = headerData;
        UINT32 dwMagic = *reinterpret_cast<UINT32 *>(pByteData);
        if (dwMagic != ' SDD')   // "DDS "
        {
            return false;
        }

        pByteData += 4;
        rawTextureSize -= 4;

        DDS_HEADER *header = reinterpret_cast<DDS_HEADER *>(pByteData);
        pByteData += sizeof(DDS_HEADER);
        rawTextureSize -= sizeof(DDS_HEADER);

        pInfo->width = header->dwWidth;
        pInfo->height = header->dwHeight;
        pInfo->depth = header->dwDepth ? header->dwDepth : 1;
        pInfo->mipMapCount = header->dwMipMapCount ? header->dwMipMapCount : 1;