Method validateTranscode

tools/ktx2check/ktx2check.cpp:2177–2215

Must be called last as it rewinds the file.

// Must be called last as it rewinds the file.
bool
ktxValidator::validateTranscode(validationContext& ctx)
{
    uint32_t* bdb = ctx.pActualDfd + 1; // Basic descriptor block.
    uint32_t model = KHR_DFDVAL(bdb, MODEL);
    if (model != KHR_DF_MODEL_UASTC && model != KHR_DF_MODEL_ETC1S) {
        // Nothin to do. Not transcodable.
        return true;
    }

    bool retval;
    istream& is = *ctx.inp;
    is.seekg(0);
    streambuf* _streambuf = (is.rdbuf());
    StreambufStream<streambuf*> ktx2Stream(_streambuf, ios::in);
    KtxTexture<ktxTexture2> texture2;
    ktx_error_code_e result = ktxTexture2_CreateFromStream(ktx2Stream.stream(),
                                        KTX_TEXTURE_CREATE_LOAD_IMAGE_DATA_BIT,
                                        texture2.pHandle());
    if (result != KTX_SUCCESS) {
        addIssue(logger::eError, FileError.CreateFailure,
                 ktxErrorString(result));
        retval = false;
    }

    if (model == KHR_DF_MODEL_ETC1S)
        result = ktxTexture2_TranscodeBasis(texture2.handle(),
                                            KTX_TTF_ETC2_RGBA, 0);
    else
        result = ktxTexture2_TranscodeBasis(texture2.handle(),
                                            KTX_TTF_ASTC_4x4_RGBA,  0);
    if (result != KTX_SUCCESS) {
        addIssue(logger::eError, Transcode.Failure, ktxErrorString(result));
        retval = false;
    } else {
        retval = true;
    }
    return retval;
}