[vtkusers] vtkOpenGLClearErrorMacro() never returns

[Marco Sambin]

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/>
>
>
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> Road, Orpington, Kent  BR5 3BD, UK
>
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