Method UpdateTexture

Source/Engine/Tools/TextureTool/TextureTool.cpp:398–470

}

bool TextureTool::UpdateTexture(GPUContext* context, GPUTexture* texture, int32 arrayIndex, int32 mipIndex, Span<byte> data, uint32 rowPitch, uint32 slicePitch, PixelFormat dataFormat)
{
    PROFILE_MEM(GraphicsTextures);
    PixelFormat textureFormat = texture->Format();

    // Basis Universal data transcoded into the runtime GPU format (supercompressed texture)
    if (dataFormat == PixelFormat::Basis)
    {
#if COMPILE_WITH_BASISU
        return UpdateTextureBasisUniversal(context, texture, arrayIndex, mipIndex, data, rowPitch, slicePitch, dataFormat);
#else
        LOG(Error, "Loading Basis Universal textures is not supported on this platform.");
#endif
    }

    // Try converting texture on the fly (slow)
    Array<byte> tempData;
    if (textureFormat != dataFormat)
    {
        PROFILE_CPU_NAMED("ConvertTexture");

        int32 mipWidth, mipHeight, mipDepth;
        texture->GetMipSize(mipIndex, mipWidth, mipHeight, mipDepth);

        auto dataSampler = PixelFormatSampler::Get(dataFormat);
        auto textureSampler = PixelFormatSampler::Get(textureFormat);
        if (dataSampler && textureSampler)
        {
            // Conversion with an in-built samplers
            auto tempRowPitch = mipWidth * textureSampler->PixelSize;
            auto tempSlicePitch = tempRowPitch * mipHeight;
            tempData.Resize(tempSlicePitch * mipDepth);
            ASSERT(data.Length() / rowPitch >= (uint32)mipHeight);
            for (int32 y = 0; y < mipHeight; y++)
            {
                for (int32 x = 0; x < mipWidth; x++)
                {
                    Color color = dataSampler->SamplePoint(data.Get(), x, y, rowPitch);
                    textureSampler->Store(tempData.Get(), x, y, tempRowPitch, color);
                }
            }
            data = ToSpan(tempData);
            rowPitch = tempRowPitch;
            slicePitch = tempSlicePitch;
        }
        else
        {
            // Conversion with external library
            TextureData src, dst;
            src.Width = mipWidth;
            src.Height = mipHeight;
            src.Depth = mipDepth;
            src.Format = dataFormat;
            auto& srcItem = src.Items.AddOne();
            auto& srcMip = srcItem.Mips.AddOne();
            srcMip.RowPitch = rowPitch;
            srcMip.DepthPitch = slicePitch;
            srcMip.Lines = slicePitch / rowPitch;