This makes no sense by itself, but we want to create the EGLImage at
DmabufTexture construction so that we can actually reject dmabufs that
we can't create EGLImages for.
This will make it possible to bail when the stride limitation for AMD
GPUs hits.
Instead of having an add_formats() function, make the get_downloader()
function add the formats.
This allows putting the actual downloader in a different place from the
initialization code.
That way, we can work with older libdrm versions.
The list was generated via a bit of sed and grep from the current
dmabuf-fourcc.h, which is why I put it into its own file and included
all the formats, no matter how old they are.
Make sure all our dmabuf debug messages are display-scoped so the
inspector doesn't trigger them, use the same formatting throughout,
and improve consistency of wording here and there.
Getting this wrong matters, since we won't offload textures in
non-opaque formats. Found by Robert Mader. At the same time,
unify the two places we have for mapping from fourcc to memory
format.
Remove all the roadblocks we've put up to keep implicit modifiers
out. Our importing code already handles them as a signal that says
'No modifiers, please!'. Now we just hope for the best and pass
things along.
This is necessary since some drivers won't produce any explicit
modifiers.
We were confusingly printing "supported format" for dmabuf formats
that we end up not adding to our list of supported formats. Don't
do that, it is confusing. At the same time, we shuold print out
the linear formats we support via mmap.
Add an implementation of GdkDmabufDownloader that uses
gsk_renderer_render_texture + GL texture download.
Since gsk isn't threadsafe, we do the download in the main thread,
taking care to not disturb the current GL context of whatever is
going on there at the time.
And since gsk renderers are expensive to create, we cache it
in the display.
Note that gsk does not yet have any special support for
dmabuf textures, so for now, they will always get downloaded
and then reuploaded as GL textures.
