<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [Regression] widgets rendered black in gtk" href="https://bugs.freedesktop.org/show_bug.cgi?id=107530#c6">Comment # 6</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [Regression] widgets rendered black in gtk" href="https://bugs.freedesktop.org/show_bug.cgi?id=107530">bug 107530</a> from <a class="email" href="mailto:lionel.g.landwerlin@linux.intel.com" title="Lionel Landwerlin <lionel.g.landwerlin@linux.intel.com>"> Lionel Landwerlin</a> <pre>So I went back and compiled 18.0.5 and unfortunately it doesn't work for me. All the widgets are black outside the GLArea. Interestingly if you set LIBGL_DRI3_DISABLE=1 the rendering of the widgets sometimes appear. GTK+ tries to be clever by reading back it's front buffer into the back buffer. What I found is that DRI3 will outright prevent you from reading back the front buffer of a window : <a href="https://gitlab.freedesktop.org/mesa/mesa/blob/master/src/loader/loader_dri3_helper.c#L1930">https://gitlab.freedesktop.org/mesa/mesa/blob/master/src/loader/loader_dri3_helper.c#L1930</a> That makes the core of Mesa fill the texture unit, that should be used to sample from the front buffer of the window, use the default that is a 1x1 black texture. You can workaround that issue by disabling the texture from pixmap mechanism of GTK+ by setting GDK_GL=software-draw-surface. I'm not really experienced enough to tell what part of the stack is broken :(</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>