http://bugs.winehq.org/show_bug.cgi?id=2398
------- Additional Comments From willie@froq.net 2006-23-04 11:07 ------- OpenGL can draw to either a X window, a GLX pixmap, or a Pbuffer. GLX pixmaps and Pbuffers are offscreen. See "Course 24: OpenGL and Window System Integration, Siggraph 1997": http://www.mesa3d.org/brianp/sig97/glxport.htm#Pixmaps And: http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi?coll=0650&db=man&...
I have no idea if this helps, though. According to the linked article, direct rendering is usually not available for GLX pixmaps (but the article is quite old, so this might have changed). No idea about Pbuffers. It is possible to copy the content of the pixmap anywhere you want, though, as far as I understood the docs.