[Bug 73200] New: vdpau-GL interop fails due to different screen objects

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=73200

          Priority: medium
            Bug ID: 73200
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
           Summary: vdpau-GL interop fails due to different screen objects
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: ystreet00-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
          Hardware: Other
            Status: NEW
           Version: 10.0
         Component: Drivers/DRI/nouveau
           Product: Mesa

Basically I'm trying out the GL_NV_vdpau_interop extension and it's failing
with GL_INVALID_OPERATION inside mesa/state_tracker/st_vdpau.c:121
st_vdpau_map_surface() because the GL screen and the vdpau screen are
different.

Things I've tried:
 - Straight vdpau/x11 (no GL) - works nicely
 - #if 0 the screen equal check - Fails with 'Kernel rejected pushbuf'.  From
this I made the assumption that the screen represents some gpu context and thus
the object space that is addressable.  Also what I gathered from the libdrm
code.
 - Copying the fd hash table from the radeon_drm_winsys_create() into
nouveau_drm_screen_create().  That fails to work because vl_screen_create() and
dri2CreateScreen() both create seperate drm fds resulting in different entries
in the hash table (that's not the same - see next point)
 - static screen singleton (ignoring subsequent drm fds) however
nouveau_drm_screen_create is duplicated in both
/usr/lib/vdpau/libvdpau_nouveau.so and /usr/lib/xorg/modules/dri/nouveau_dri.so
and thus have different locations.

So all of my attempts to get the screens the same have so far failed and I am
not all that familiar with mesa internals to suggest a solution :)

Versions:
$ uname -a
Linux matt-arch 3.12.6-1-ARCH #1 SMP PREEMPT Fri Dec 20 19:39:00 CET 2013
x86_64 GNU/Linux
$ pacman -Si mesa | grep Version
Version        : 10.0.1-1
$ pacman -Si libdrm | grep Version
Version        : 2.4.50-1

Some logs follow.

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