[Mesa-dev] [PATCH 1/4] gallium/dri: Allow drivers to support DRI Image v7

[Christopher James Halse Rogers]

On Mon, 2013-04-22 at 21:38 +1000, Dave Airlie wrote:
> On Mon, Apr 22, 2013 at 9:09 PM, Jose Fonseca <jfonseca at vmware.com> wrote:
> > ----- Original Message -----
> >> From: Christopher James Halse Rogers <raof at ubuntu.com>
> >>
> >> This is only exposed by drivers wich support the new PIPE_CAP_PRIME
> >> parameter,
> >> for PRIME import/export.
> >
> > What does exactly PIPE_CAP_PRIME entail? Please document it.
> 
> Also why is it needed at all?
> 
> pipe drivers should be able to render to/from any buffer the winsys
> can hand it I don't think we need special treatment here, maybe just
> have the generic code ask the generic kernel cap for prime support.

It's perhaps not in the right place, but I couldn't find a better one. A
generic solution in the dri state tracker querying DRM_CAP_PRIME would
be possible, but I think suboptimal - you really want to know if the
winsys can handle dma-buf fds, and that's hidden.

It's easy enough to keep PIPE_CAP_PRIME and make the pipe drivers not
pull in drm.h, if that's accepable.

If its not acceptable, and it's ok to lie about driver support for image
v7 then I can gate it in the dri state tracker.