[Bug 92220] GL_NV_vdpau_interop partially available

https://bugs.freedesktop.org/show_bug.cgi?id=92220

--- Comment #13 from Peter Frühberger fritsch@xbmc.org --- If I was to decide, I would suggest:

2. Add an extra step to the drivers using shaders to split the frame up into >separate fields in vlVdpVideoSurfaceGallium

(src/gallium/state_trackers/vdpau/surface.c) for chips that don't support field >based decode. This adds an extra copy and someone needs to write the code. With >that done, the extension can be enabled on all asics.

Reason: - No application needs to be changed and all methods would be supported by this hardware, too. - Our workarounds + extra code to handle the env would also easily be 50+ lines :-) and that per application (kodi, mpv, ...)

So @Christian happy for pointers on how to get it going.