[llvmpipe] gtkopengl rendering glitches

Submitted by Lukas K.

Assigned to mes..@..op.org

Link to original bug (#99863)

Description

Created attachment 129746 test case

On llvmpipe, GtkGLarea causes the whole window to get messed up: https://bugzilla.gnome.org/show_bug.cgi?id=778006

Even just creating a gl context for a widget causes glitchy rendering, see the attached python script for a test case.

Attachment 129746, "test case":
gltest2.py