[VirtualGL-Users] Using VirtualGL as a transport AFTER rendering on the remote screen.

[Eric A. <era...@gm...>]

Imagine I have a laptop with 2 GPUs. An Intel one connected to the LVDS, 
VGA, and HDMI. And an Nvidia one connected to no physical output.

Each GPU has its own X server. The Intel one (:0) is the primary one and 
runs the visible desktop. The Nvidia one (:8) is started and stopped as 
needed.

What I'd like to do is the following:

1. Start the app on the invisible Nvidia desktop. Let it render here, on 
that screen instead of the Intel one. VDPAU in particular does not 
permit rendering on the Intel screen.
DISPLAY=:8 mplayer -vo vdpau file

2. Dump the already rendered window from :8 and display on :0
vglrun magic

Is this possible? I looked into Xpra; it provides better performance 
numbers, but the framerate makes it unusable.

Kind regards,
Eric