[Octave-bug-tracker] [bug #41747] Octave crashes if you try to plot and your video card is not configured for OpenGL

[Mike Miller]

Follow-up Comment #3, bug #41747 (project octave):

The segfault occurs in the function Fl_Gl_Window::make_current(). The
following patch avoids a crash for me:


--- a/__init_fltk__.cc
+++ b/__init_fltk__.cc
@@ -932,7 +932,10 @@ public:
     if (fp.is_visible ())
       {
         canvas->show ();
-        canvas->make_current ();
+        if (! canvas->shown ())
+          error ("unable to plot with OpenGL");
+        else
+          canvas->make_current ();
       }
   }
 


In this case I end up seeing the error message "unable to plot with OpenGL"
and I get a figure with an empty drawing area, no segfault.

With this patch I still end up with an empty figure being created, but it at
least avoids crashing Octave. When I run "figure" I get an empty figure
created with no crash or error message from Octave, but a message, presumably
from FLTK, saying "Insufficient GL support". So there might still be a
different way to catch this even before a figure is created.

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