[Xcb] No opengl3 rendering

[Peter Harris]

On 2015-11-02 14:15, Remi Thebault wrote:
> Hello
> 
> I have the following findings:
> From a fully working Xlib client, switching only the event loop to xcb
> (keeping XCreateWindow and other xlib calls) makes it bug.

Most libgl register a hidden event handler with Xlib. That functionality
was only added to xcb recently (see xcb_register_for_special_xge). If
you have an older mesa (or a binary blob) libGL, you may need to stick
with the Xlib event queue until your libGL is updated to support xcb.

Peter Harris
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