Function ktxTexture2_constructFromStreamAndHeader

lib/texture2.c:674–1061

* @memberof ktxTexture2 @private * @~English * @brief Construct a ktxTexture from a ktxStream reading from a KTX source. * * The KTX header, which must have been read prior to calling this, is passed * to the function. * * The stream object is copied into the constructed ktxTexture2. * * The create flag KTX_TEXTURE_CREATE_LOAD_IMAGE_DATA_BIT should not be set, * if the ktxTexture is ulti

 *                              supported by OpenGL or Vulkan, e.g, a 3D array.
 */
KTX_error_code
ktxTexture2_constructFromStreamAndHeader(ktxTexture2* This, ktxStream* pStream,
                                        KTX_header2* pHeader,
                                        ktxTextureCreateFlags createFlags)
{
    ktxTexture2_private* private;
    KTX_error_code result;
    KTX_supplemental_info suppInfo;
    ktxStream* stream;
    struct BDFD* pBDFD;
    ktx_size_t levelIndexSize;

    assert(pHeader != NULL && pStream != NULL);

    memset(This, 0, sizeof(*This));
    result = ktxTexture_constructFromStream(ktxTexture(This), pStream,
                                            createFlags);
    if (result != KTX_SUCCESS)
        return result;

    result = ktxCheckHeader2_(pHeader, &suppInfo);
    if (result != KTX_SUCCESS)
        goto cleanup;
    // ktxCheckHeader2_ has done the max(1, levelCount) on pHeader->levelCount.
    result = ktxTexture2_constructCommon(This, pHeader->levelCount);
    if (result != KTX_SUCCESS)
        goto cleanup;
    private = This->_private;

    stream = ktxTexture2_getStream(This);

    /*
     * Initialize from pHeader->info.
     */
    This->vkFormat = pHeader->vkFormat;
    This->supercompressionScheme = pHeader->supercompressionScheme;

    This->_protected->_typeSize = pHeader->typeSize;
    // Can these be done by a ktxTexture_constructFromStream?
    This->numDimensions = suppInfo.textureDimension;
    This->baseWidth = pHeader->pixelWidth;
    assert(suppInfo.textureDimension > 0 && suppInfo.textureDimension < 4);
    switch (suppInfo.textureDimension) {
      case 1:
        This->baseHeight = This->baseDepth = 1;
        break;
      case 2:
        This->baseHeight = pHeader->pixelHeight;
        This->baseDepth = 1;
        break;
      case 3:
        This->baseHeight = pHeader->pixelHeight;
        This->baseDepth = pHeader->pixelDepth;
        break;
    }
    if (pHeader->layerCount > 0) {
        This->numLayers = pHeader->layerCount;
        This->isArray = KTX_TRUE;