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[Octave-bug-tracker] [bug #31931] figure (1, "visible", "off") -> Bus er
From: |
Søren Hauberg |
Subject: |
[Octave-bug-tracker] [bug #31931] figure (1, "visible", "off") -> Bus error |
Date: |
Sun, 06 Feb 2011 20:31:29 +0000 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686; da-DK; rv:1.9.2.13) Gecko/20101206 Ubuntu/10.10 (maverick) Firefox/3.6.13 |
Follow-up Comment #17, bug #31931 (project octave):
I've spend a little time on investigating this issue as it really makes FLTK
unstable for me. With the current code I see a crash when I do
graphics_toolkit fltk
figure
The crash happens in the call to 'canvas->resize' in
'plot_window::show_menubar'. The issue is that en OpenGL context has not been
created at this time, which causes the line
glMatrixMode (GL_PROJECTION);
in 'OpenGL_fltk::setup_viewport' to crash Octave. Thus, the real question is:
why has an OpenGL context not been created?
Well, in the 'plot_window' constructor we have the following code
if (fp.get_currentaxes ().ok())
show_canvas ();
else
hide_canvas ();
As I have just called 'figure' from the Octave prompt, there is no plot
content and hence no axes. This means that 'show_canvas' is not called. This
is important as 'show_canvas' calls 'canvas->make_current ()' which creates
the current OpenGL context.
I tried adding
canvas->make_current ();
before the above-mentioned conditional expression in the 'plot_window'
constructor and I no longer see the crash and things work for me. I realise
that this is most-likely not the correct solution, but hopefully it provides a
hint of what the right solution might be.
I hope this is helpful :-)
Søren
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- [Octave-bug-tracker] [bug #31931] figure (1, "visible", "off") -> Bus error,
Søren Hauberg <=
- [Octave-bug-tracker] [bug #31931] figure (1, "visible", "off") -> Bus error, John W. Eaton, 2011/02/07
- [Octave-bug-tracker] [bug #31931] figure (1, "visible", "off") -> Bus error, John W. Eaton, 2011/02/07
- [Octave-bug-tracker] [bug #31931] figure (1, "visible", "off") -> Bus error, Søren Hauberg, 2011/02/07
- [Octave-bug-tracker] [bug #31931] figure (1, "visible", "off") -> Bus error, Ben Abbott, 2011/02/07
- [Octave-bug-tracker] [bug #31931] figure (1, "visible", "off") -> Bus error, Ben Abbott, 2011/02/07
- [Octave-bug-tracker] [bug #31931] figure (1, "visible", "off") -> Bus error, Ben Abbott, 2011/02/07