Function ktxTexture1_constructFromStreamAndHeader

lib/texture1.c:186–379

* @memberof ktxTexture1 @private * @brief Construct a ktxTexture1 from a ktxStream reading from a KTX source. * * The KTX header, that must have been read prior to calling this, is passed * to the function. * * The stream object is copied into the constructed ktxTexture1. * * The create flag KTX_TEXTURE_CREATE_LOAD_IMAGE_DATA_BIT should not be set, * if the ktxTexture1 is ultimately to be

 *                              supported by OpenGL or Vulkan, e.g, a 3D array.
 */
KTX_error_code
ktxTexture1_constructFromStreamAndHeader(ktxTexture1* This, ktxStream* pStream,
                                          KTX_header* pHeader,
                                          ktxTextureCreateFlags createFlags)
{
    ktxTexture1_private* private;
    KTX_error_code result;
    KTX_supplemental_info suppInfo;
    ktxStream* stream;
    ktx_off_t pos;
    ktx_size_t size;
    ktxFormatSize formatSize;

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

	memset(This, 0, sizeof(*This));
    result = ktxTexture_constructFromStream(ktxTexture(This), pStream, createFlags);
    if (result != KTX_SUCCESS)
        return result;
    result = ktxTexture1_constructCommon(This);
    if (result != KTX_SUCCESS) {
        ktxTexture_destruct(ktxTexture(This));
        return result;
    }

    private = This->_private;
    stream = ktxTexture1_getStream(This);

    result = ktxCheckHeader1_(pHeader, &suppInfo);
    if (result != KTX_SUCCESS)
        goto cleanup;

    /*
     * Initialize from pHeader info.
     */
    This->glFormat = pHeader->glFormat;
    This->glInternalformat = pHeader->glInternalformat;
    This->glType = pHeader->glType;
    glGetFormatSize(This->glInternalformat, &formatSize);
    if (formatSize.blockSizeInBits == 0) {
        // Most likely a deprecated legacy format.
        result = KTX_UNSUPPORTED_TEXTURE_TYPE;
        goto cleanup;
    }
    This->_protected->_formatSize = formatSize;
    This->glBaseInternalformat = pHeader->glBaseInternalformat;
    // 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;