[vtkusers] vtkOpenGLClearErrorMacro() never returns

[Richard Whitehead]

Marco,
Thanks for the support!  I only get it on one of my computers, where OpenGL
is issuing warnings, but then the purpose of this code is to clear
warnings...  It simply doesn't work.  Hopefully someone who knows what it's
doing could fix it.
Thanks again,
Richard


On 15 April 2014 10:49, Marco Sambin <m.sambin at gmail.com> wrote:

> Hi Richard,
>
> quite a while ago, while I was making experiments with the use of JOGL
> with VTK under Windows, I encountered the same issue that you describe.
>
> Basically, in some cases my application got stuck, and the CPU usage went
> up to 25% (I have a quad core processor on my dev PC). I discovered this
> was due to a "vtkClearOpenGLErrors()" call in the rendering pipeline, which
> was iterating indefinitely in its "while" loop. Not sure what was the real
> cause of this, did not have the time to debug in detail. At that time, I
> worked around the problem by setting the VTK_REPORT_OPENGL_ERRORS option to
> "false" on CMake (which forces the implementation of vtkClearOpenGLErrors()
> to be empty). I understand that this may not be a viable workaround in your
> case, and I also believe it would be good to understand the real cause for
> this infinite loop inside vtkClearOpenGLErrors().
>
> But for now, I can only let you know that "you are not alone" ;-)
>
> Maybe someone else on the list can shed some more light or share some
> experience about this issue.
>
> Best regards,
>
> Marco
>
>
>
> On Mon, Apr 14, 2014 at 1:04 PM, Richard Whitehead <
> richard.whitehead at vivosight.com> wrote:
>
>>
>> This new macro was introduced in 6.1.0.  It is getting called when my app
>> exits and it sits in an infinite loop.
>> The documentation say is t is supposed to silently clear errors, but it
>> is not doing this.
>>
>> Please can anyone suggest how to fix it?  Since my app is closing I am
>> willing to discard errors, but the only method I can see that should clear
>> errors is, well, vtkOpenGLClearErrorMacro...
>>
>> Many thanks,
>>
>> Richard
>>
>>
>>
>>
>> --
>>
>> Richard Whitehead *-* Senior Imaging Engineer
>>
>> *Michelson Diagnostics Ltd*
>>
>> *M:* +44 (0)7905 955276   *T:* +44 (0)20 8308 1695
>>
>> *E: *richard.whitehead at vivosight.com   *W:* www.vivosight.com
>>
>>
>> <http://www.vivosight.com/>
>>
>>
>> Michelson Diagnostics Ltd, 1 Grays Farm Production Village, Grays Farm
>> Road, Orpington, Kent  BR5 3BD, UK
>>
>> Registered Office: 3 Shearwater, Maidstone, ME16 0DW.     Registered in
>> England No. 5732681
>>
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-- 

Richard Whitehead *-* Senior Imaging Engineer

*Michelson Diagnostics Ltd*

*M:* +44 (0)7905 955276   *T:* +44 (0)20 8308 1695

*E: *richard.whitehead at vivosight.com   *W:* www.vivosight.com


<http://www.vivosight.com/>


Michelson Diagnostics Ltd, 1 Grays Farm Production Village, Grays Farm
Road, Orpington, Kent  BR5 3BD, UK

Registered Office: 3 Shearwater, Maidstone, ME16 0DW.     Registered in
England No. 5732681
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