If Valve compile against MESA, then we can get the GUI working. As the Pi libs for GLES will have the same headers; this could probably already be done with some tweaking.
I’m guessing they also use hardware acceleration; but I don’t know what video pipeline they are using. If they can use V4L2 or they can pass us H264 frames, we can likely get something working.
It’s early days yet, but we’ll continue to monitor things
Cheers
Sam