Qt-interest Archive, July 2007
QOpenGLPaintEngine: Failed to create fragment programs.
Message 1 in thread
I've just upgraded my system from 4.2 to 4.3, running FC5. A
program that has been working perfectly until now emits the
following message:
QOpenGLPaintEngine: Failed to create fragment programs.
multiple times. The program still works as before, but emits
these irritating (and totally meaningless) messages.
The program has a central QGLWidget and a satellite QGLWidget
which shows the results of operations on the central widget.
The message is only emitted when the second widget is
present - it disappears if I remove all the 'rendertext' statements
in the second widget.
I have a) no idea what the message means, although it seems
to be related to improvements in the 4.3 OpenGL rendering system.
b) how to get rid of it - I can see no obvious errors.
Some guidance, please.
DS
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Message 2 in thread
>I've just upgraded my system from 4.2 to 4.3, running FC5. A
>program that has been working perfectly until now emits the
>following message:
>QOpenGLPaintEngine: Failed to create fragment programs.
>multiple times. The program still works as before, but emits
>these irritating (and totally meaningless) messages.
>The program has a central QGLWidget and a satellite QGLWidget
>which shows the results of operations on the central widget.
>The message is only emitted when the second widget is
>present - it disappears if I remove all the 'rendertext' statements
>in the second widget.
>I have a) no idea what the message means, although it seems
>to be related to improvements in the 4.3 OpenGL rendering system.
>b) how to get rid of it - I can see no obvious errors.
>Some guidance, please.
>DS
A second request for help - I keep getting these messages
when I create a second (or third) QGLWidget AND I have
'rendertext' statements in the 2nd (or 3rd) widget. They occur
in 4.3 (not 4.2) when running either FC5 or FC7.
It's very frustrating - I'm not sure what error this is - where
it is occuring, why it is, or how to cure it.
It doesn't seem to have any affect on the rendering of the image,
but it is a damn nuisance.
Anyone?
DS
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Message 3 in thread
On Jul 4, 2007, at 11:26 AM, David Scriven wrote:
>
>> I've just upgraded my system from 4.2 to 4.3, running FC5. A
>> program that has been working perfectly until now emits the
>> following message:
>
>> QOpenGLPaintEngine: Failed to create fragment programs.
>> multiple times. The program still works as before, but emits
>> these irritating (and totally meaningless) messages.
>
>> The program has a central QGLWidget and a satellite QGLWidget
>> which shows the results of operations on the central widget.
>> The message is only emitted when the second widget is
>> present - it disappears if I remove all the 'rendertext' statements
>> in the second widget.
>
>> I have a) no idea what the message means, although it seems
>> to be related to improvements in the 4.3 OpenGL rendering system.
>> b) how to get rid of it - I can see no obvious errors.
>
>> Some guidance, please.
>
>> DS
>
> A second request for help - I keep getting these messages
>
> when I create a second (or third) QGLWidget AND I have
>
> 'rendertext' statements in the 2nd (or 3rd) widget. They occur
> in 4.3 (not 4.2) when running either FC5 or FC7.
>
>
>
> It's very frustrating - I'm not sure what error this is - where
>
> it is occuring, why it is, or how to cure it.
>
>
>
> It doesn't seem to have any affect on the rendering of the image,
>
> but it is a damn nuisance.
>
>
>
> Anyone?
>
>
>
> DS
I don't know what the actual problem is, but the error is coming from
the Qt OpenGL paint engine ($QTDIR/src/opengl/
qpaintengine_opengl.cpp). The
QOpenGLPaintEnginePrivate::createFragmentPrograms() method is failing
to create one of the mask or brush fragment programs. It's not
affecting the functionality because the use of the Qt fragment
programs is disabled if any of them fail to get created.
Do you see any other messages of the form "Couldn't create mask ...
fragment program ..." or "Couldn't create painter ... fragment
program ..."? Looking at the code, one of these messages should be
displayed via a qDebug() statement.
The messages above will at least indicate which of the fragment
programs is causing the error. This won't solve the problem, but at
least you could look at the fragment program that's causing the error
(see the $QTDIR/src/opengl/util/fragmentprograms_p.h and the
associated GLSL files in the same directory). You could also put in
some debugging code into the qt_createFragmentProgram() function to
display the OpenGL error code after the failure.
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Message 4 in thread
David Scriven schrieb:
>> ...
>> QOpenGLPaintEngine: Failed to create fragment programs.
>> multiple times. The program still works as before, but emits
>> these irritating (and totally meaningless) messages.
> ...
> it is occuring, why it is, or how to cure it.
Did you try the latest graphic card driver for your card (nVidia? ATI?)?
There has been another poster complaining about OpenGL anomalies on a
SuSE system (10.0? 10.1?)with the shipped OpenGL driver. After
installing the latest driver these issues disappeared.
I know this sounds like a "This answer cures everything", but it's worth
a try...
Cheers, Oliver
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Message 5 in thread
On Thursday 05 July 2007 10:04, Till Oliver Knoll wrote:
> David Scriven schrieb:
> >> ...
> >> QOpenGLPaintEngine: Failed to create fragment programs.
> >> multiple times. The program still works as before, but emits
> >> these irritating (and totally meaningless) messages.
> >
> > ...
> > it is occuring, why it is, or how to cure it.
>
> Did you try the latest graphic card driver for your card (nVidia? ATI?)?
>
> There has been another poster complaining about OpenGL anomalies on a
> SuSE system (10.0? 10.1?)with the shipped OpenGL driver. After
> installing the latest driver these issues disappeared.
Its been a SuSE 10.2. And it segfaulted ...
However installing the driver update from SuSE didn't cure all:-(
Only installing the _same_ updated driver from NVidia manuelly helped ...
Frank
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