Method CopyTextureImageData

deps/LLGL/sources/Renderer/RenderSystem.cpp:439–491

}

void RenderSystem::CopyTextureImageData(
    const DstImageDescriptor&   dstImageDesc,
    const Extent3D&             extent,
    const Format                format,
    const void*                 data,
    std::size_t                 rowStride)
{
    /* Check if image buffer must be converted */
    const auto  numTexels       = (extent.width * extent.height * extent.depth);
    const auto& srcTexFormat    = GetFormatAttribs(format);
    auto        srcFormatSize   = DataTypeSize(srcTexFormat.dataType) * ImageFormatSize(srcTexFormat.format);
    auto        srcImageSize    = (numTexels * srcFormatSize);
    const auto  dstPitch        = (extent.width * srcFormatSize);

    if (srcTexFormat.format != dstImageDesc.format || srcTexFormat.dataType != dstImageDesc.dataType)
    {
        /* Check if padding must be removed */
        ByteBuffer unpaddedData;
        if (rowStride != 0 && dstPitch != rowStride)
        {
            unpaddedData = GenerateEmptyByteBuffer(srcImageSize, false);
            CopyRowAlignedData(unpaddedData.get(), data, srcImageSize, dstPitch, rowStride);
            data = unpaddedData.get();
        }

        /* Determine destination image size */
        auto dstFormatSize  = DataTypeSize(dstImageDesc.dataType) * ImageFormatSize(dstImageDesc.format);
        auto dstImageSize   = (numTexels * dstFormatSize);

        /* Validate input size */
        AssertImageDataSize(dstImageDesc.dataSize, dstImageSize);

        /* Convert mapped data into requested format */
        auto tempData = ConvertImageBuffer(
            SrcImageDescriptor{ srcTexFormat.format, srcTexFormat.dataType, data, srcImageSize },
            dstImageDesc.format, dstImageDesc.dataType, GetConfiguration().threadCount
        );

        /* Copy temporary data into output buffer */
        ::memcpy(dstImageDesc.data, tempData.get(), dstImageSize);
    }
    else
    {
        /* Validate input size */
        AssertImageDataSize(dstImageDesc.dataSize, srcImageSize);

        /* Copy mapped data directly into the output buffer */
        if (rowStride != 0 && dstPitch != rowStride)
            CopyRowAlignedData(dstImageDesc.data, data, srcImageSize, dstPitch, rowStride);
        else
            ::memcpy(dstImageDesc.data, data, srcImageSize);
    }
}


} // /namespace LLGL