use GLXPixmap for VirtualDevice

Change-Id: I6397708f164be68bd6561a382115654f90ecd471
I screwed up before, fix it

Change-Id: Ib787319dcf75249bc7768e72d12fe9c1c23977e2
use some flags found at some examples

At least it seems to crash much later like that.

Change-Id: Ic64550aefe963a9671ce0e485d5de14376c4963e