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FYI, the problem is still present in the final VTK 6.3. The solution
provided by Ken can be found at <br>
<br>
<a class="moz-txt-link-freetext" href="https://gitlab.kitware.com/vtk/vtk/merge_requests/638">https://gitlab.kitware.com/vtk/vtk/merge_requests/638</a><br>
<br>
Marcin<br>
<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 09/08/2015 03:32 PM, Marcin
Krotkiewski wrote:<br>
</div>
<blockquote cite="mid:55EEE362.4010800@gmail.com" type="cite">
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Hi, Ken,<br>
<br>
I have found two issues here. First, I think the
vtk.sample.VTKCanvas example (on which I based my simplified code)
might be wrong because it does not call frame.setVisible in EDT.
From what I have seen in other examples frame.setVisible should be
called from InvokeLater. Note that there are other places in Java
examples where JFrame.setVisible is called _NOT_ from within
InvokeLater. If this is an error, it might be a good idea to fix
this.. At least for me changing this partly fixed the problem,
i.e., the error was more difficult for me to get in the example,
but not in my real code, where frame.setVisible is called from
EDT (I am _almost_ certain of this, as I call Java indirectly
from MATLAB, and I do use MATLABs EDT framework).<br>
<br>
Hunting the real problem, I have already mentioned that I got
error from glewInit. Writing out the reason for the error gave me
'Missing GL version'. I am no expert in OpenGL, so I googled
around and understood that this might mean that glewInit was
called before OpenGL context was created. Due to this fact glew
was not initialized and the code segfaulted on call to
glBlendFuncSeparate in OpenGLInitState due to the address being
NULL. <br>
<br>
This made me experiment with vtkOpenGLRenderWindow and
vtkXOpenGLRenderWindow. I have found that from 6.2 you have
changed the initialization in
vtkXOpenGLRenderWindow::CreateAWindow. In particular, you have
added the if statement after '// try for 32 context'. Being
desperate I have commented out the entire
if(this->internal->fbconfig) statement. This worked for me,
i.e., I did not manage to get a glewInit error after the change.
Neither in my code, nor in the VTKCanvas sample.<br>
<br>
I do not know exactly what this code does, but it might need a
second look. From the observed behavior it was very much like a
race condition: I was getting the glewInit 'Missing GL version'
condition sometimes, but not always. Of course, this might mean
that commenting out those lines does not fix anything, just hides
the problem.<br>
<br>
Let me know if you need more information - I will gladly work
towards fixing this.<br>
<br>
Marcin<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 09/08/2015 02:47 PM, Ken Martin
wrote:<br>
</div>
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<p class="MsoNormal"><a moz-do-not-send="true"
name="_MailEndCompose"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Can
either of you verify that the VTK C++ tests work on the
system? E.g. ctest –R Mace passes? Just trying to see
if this is a general system/VM issue or tied
specifically to Java/OpenGL2 interactions.</span></a></p>
<p class="MsoNormal"><span
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Thanks</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Ken</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Ken
Martin PhD</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Chairman
& CFO</span></p>
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Inc.</span></p>
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<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
vtkusers [mailto:<a moz-do-not-send="true"
href="mailto:vtkusers-bounces@vtk.org">vtkusers-bounces@vtk.org</a>]
<b>On Behalf Of </b>Jens Schmidt<br>
<b>Sent:</b> Monday, September 7, 2015 12:53 PM<br>
<b>To:</b> marcin.krotkiewski; VTK Users<br>
<b>Subject:</b> Re: [vtkusers] segfault with Opengl2
in 6.3.0.rc2</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<p class="MsoNormal" style="margin-bottom:12.0pt">To chime in,
the jvm (1.8.60) crashes on debian jessie (virtualbox) when
using the opengl2 rendering backend (vtk 6.3.0rc1 and rc2)
and the swtComponent. The old OpenGL works fine.<br>
When not using virtualbox's 3d accelleration the window wont
even open. When activating the 3d accelleration you get a
window but as soon as you add some actors and call update it
crashes (some of the time).<br>
Also the jvm crashes when running everything on "real"
hardware (Intel HD Graphics 4600) instead of a virtual
machine. <br>
Unfortunately i cannot access the logs right now (vacation)
if this still is an issue after, i happily provide any logs
you desire :-)<br>
Just wanted to let you know, keep up the good work!<br>
<br>
<br>
i also have segfaults with the opengl2 backend on linux
(debian jessie) running on virtualbox.<br>
<br>
</p>
<div>
<p class="MsoNormal">Am 05.09.2015 um 21:32 schrieb
marcin.krotkiewski:</p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal">I keep getting segfaults when using
vtk.sample.VTKCanvas with OpenGL2 backend in 6.3.0.rc2.
This does not happen with 6.2.0 + OpenGL2, nor with the
standard OpenGL backend. I use ubuntu 14.04 and compile
with gcc 4.9.2 and jdk1.8.0_60. <br>
<br>
On my laptop, the segfaults are 100 reproducible with mesa
library - some lines from glxinfo: <br>
<br>
<br>
OpenGL renderer string: Mesa DRI Intel(R) Haswell Mobile <br>
OpenGL core profile version string: 3.3 (Core Profile)
Mesa 10.1.3 <br>
OpenGL core profile shading language version string: 3.30
<br>
<br>
<br>
When I use the high performance card (fglrx drivers,
Radeon HD 8790M) the segfaults sometimes happen, sometimes
not. Lines from glxinfo: <br>
<br>
<br>
OpenGL vendor string: Advanced Micro Devices, Inc. <br>
OpenGL renderer string: AMD Radeon HD 8790M <br>
OpenGL core profile version string: 4.3.13374 Core Profile
Context 15.20.1013 <br>
OpenGL core profile shading language version string: 4.40
<br>
<br>
<br>
I have attached a simplified java code based on VTKCanvas
- In my experience this one segfaults always, both with
mesa, and with Radeon drivers. I get the following line
before vtk dies: <br>
<br>
<br>
ERROR: In
/home/angainor/bergverk/vtk/VTK-6.3.0.rc2/Rendering/OpenGL2/vtkOpenGLRenderWindow.cxx,
line 412 <br>
vtkXOpenGLRenderWindow (0x7f110429aa90): GLEW could not be
initialized. <br>
<br>
<br>
And this is the top of the stack reported by the dying
Java VM <br>
<br>
<br>
R11=0x00007fcbd8a79840: <offset 0x72840> in
/usr/lib/fglrx/libGL.so.1 at 0x00007fcbd8a07000 <br>
<br>
Stack: [0x00007fcbb94e4000,0x00007fcbb95e5000],
sp=0x00007fcbb95e1148, free space=1012k <br>
Java frames: (J=compiled Java code, j=interpreted, Vv=VM
code) <br>
j vtk.vtkRenderWindow.Render_9()V+0 <br>
j vtk.vtkRenderWindow.Render()V+1 <br>
j vtk.vtkPanel.Render()V+164 <br>
j vtk.vtkPanel.paint(Ljava/awt/Graphics;)V+1 <br>
<br>
[...] <br>
<br>
<br>
It seems that this is a problem specific to 6.3.0.rc2 with
OpenGL2. I could not reproduce it for 6.2.0, nor when
using OpenGL backend. Do you know any reason why this
could happen? I will be happy to provide more information
and help to solve this. <br>
<br>
Cheers, <br>
<br>
Marcin <br>
<br>
<br>
<br>
<br>
</p>
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