[4/7] wined3d: YUY2 and UYVY are block based

[Henri Verbeet]

On 17 October 2011 19:54, Stefan Dösinger <stefan at codeweavers.com> wrote:
> The fixup is a separate issue. We can write to formats with fixups just fine if
> the input is in the correct format or we have a shader that can convert TO
> that format. The problem with the blocks is that if one pixel is modified the
> entire block may have to be modified, and we can't do that even with shaders.
> So we can't blit to e.g. YUY2 surfaces even if the input is YUY2 as well and
> the underlying luminance-alpha textures may be fbo attachable.
>
That's mostly a limitation of the individual blitters. You could
certainly make YUY2 and UYVY work with e.g. FBO blits as long as you
only blit on block boundaries, and I wouldn't be all that surprised if
you have to blit on block boundaries anyway in D3D. YV12 would be
harder, but at least d3d10/11 hardware could probably do it.