Re: [osg-users] OpenGL viewport error (with Oculus)

[Riccardo Corsi]

Hi Robert,

yes, it's single context, single thread, all GL calls are done by osg and
osgOculusViewer in the various camera draw callbacks.

On Fri, Oct 19, 2018 at 4:55 PM Robert Osfield 
wrote:

> Hi Riccardo,
>
> On Fri, 19 Oct 2018 at 15:38, Riccardo Corsi 
> wrote:
>
>> I've tracked the issue down to the fact that it is necessary to call
>> viewer.setReleaseContextAtEndOfFrameHint(false);
>> for the Oculus to work properly.
>>
>
> Is it running single context, single threading and then using GL calls in
> the main thread?
>
> Robert.
>
>
>
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Re: [osg-users] OpenGL viewport error (with Oculus)

[Robert Osfield]

Hi Riccardo,

On Fri, 19 Oct 2018 at 15:38, Riccardo Corsi 
wrote:

> I've tracked the issue down to the fact that it is necessary to call
> viewer.setReleaseContextAtEndOfFrameHint(false);
> for the Oculus to work properly.
>

Is it running single context, single threading and then using GL calls in
the main thread?

Robert.
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Re: [osg-users] OpenGL viewport error (with Oculus)

[Riccardo Corsi]

I've tracked the issue down to the fact that it is necessary to call
viewer.setReleaseContextAtEndOfFrameHint(false);
for the Oculus to work properly.

Thanks,
Riccardo



On Wed, Oct 17, 2018 at 2:33 PM Robert Osfield 
wrote:

> On Wed, 17 Oct 2018 at 12:17, Riccardo Corsi 
> wrote:
>
>> the error I've reported is what I get with the env var already ON.
>> Unfortunately it doesn't add any more details.
>>
>
> Try adding GL checks around any of the Oculus related code.
>
> Robert.
>
>
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Re: [osg-users] OpenGL viewport error (with Oculus)

[Robert Osfield]

On Wed, 17 Oct 2018 at 12:17, Riccardo Corsi 
wrote:

> the error I've reported is what I get with the env var already ON.
> Unfortunately it doesn't add any more details.
>

Try adding GL checks around any of the Oculus related code.

Robert.
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Re: [osg-users] OpenGL viewport error (with Oculus)

[Riccardo Corsi]

Hi Robert,

the error I've reported is what I get with the env var already ON.
Unfortunately it doesn't add any more details.
Riccardo

On Wed, Oct 17, 2018 at 12:56 PM Robert Osfield 
wrote:

> Hi Riccardo,
>
> The OSG doesn't do fine grained GL error checking by default so when it
> does check for a GL error this error may have occurred many GL operations
> before, so while the error may have been reported just after a viewport is
> set it could well be prior operations that are the cause.
>
> You can enable finer grained GL error checking by setting the
> OSG_GL_ERROR_CHECKING env var to ON i.e.
>
> set OSG_GL_ERROR_CHECKING=ON
>
> This will hopefully give you a more precise location of the error.
>
> Robert.
>
> On Wed, 17 Oct 2018 at 11:43, Riccardo Corsi 
> wrote:
>
>> Hi all,
>>
>> when using my application with the Oculus I get the following GL error at
>> every frame:
>> *Warning: detected OpenGL error 'invalid operation' after applying
>> attribute Viewport *
>>
>> This error is coming from the call RenderStage::drawImplementation()
>> 
>>  but
>> the _viewport is valid. I'm not so familiar with the backend to understand
>> where this error might come from.
>> Any hint to debug this?
>>
>> Note: I'm using the Oculus through osgOculusViewer
>> .
>> The sample Oculus viewer works fine without GL errors.
>> My app is setup the same way, I cannot spot any sensible difference.
>>
>> I'm using win10, osg 3.6.3
>>
>> Thanks,
>> Riccardo
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>>
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Re: [osg-users] OpenGL viewport error (with Oculus)

[Robert Osfield]

Hi Riccardo,

The OSG doesn't do fine grained GL error checking by default so when it
does check for a GL error this error may have occurred many GL operations
before, so while the error may have been reported just after a viewport is
set it could well be prior operations that are the cause.

You can enable finer grained GL error checking by setting the
OSG_GL_ERROR_CHECKING env var to ON i.e.

set OSG_GL_ERROR_CHECKING=ON

This will hopefully give you a more precise location of the error.

Robert.

On Wed, 17 Oct 2018 at 11:43, Riccardo Corsi 
wrote:

> Hi all,
>
> when using my application with the Oculus I get the following GL error at
> every frame:
> *Warning: detected OpenGL error 'invalid operation' after applying
> attribute Viewport *
>
> This error is coming from the call RenderStage::drawImplementation()
> 
>  but
> the _viewport is valid. I'm not so familiar with the backend to understand
> where this error might come from.
> Any hint to debug this?
>
> Note: I'm using the Oculus through osgOculusViewer
> .
> The sample Oculus viewer works fine without GL errors.
> My app is setup the same way, I cannot spot any sensible difference.
>
> I'm using win10, osg 3.6.3
>
> Thanks,
> Riccardo
> ___
> osg-users mailing list
> osg-users@lists.openscenegraph.org
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
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[osg-users] OpenGL viewport error (with Oculus)

[Riccardo Corsi]

Hi all,

when using my application with the Oculus I get the following GL error at
every frame:
*Warning: detected OpenGL error 'invalid operation' after applying
attribute Viewport *

This error is coming from the call RenderStage::drawImplementation()

but
the _viewport is valid. I'm not so familiar with the backend to understand
where this error might come from.
Any hint to debug this?

Note: I'm using the Oculus through osgOculusViewer
.
The sample Oculus viewer works fine without GL errors.
My app is setup the same way, I cannot spot any sensible difference.

I'm using win10, osg 3.6.3

Thanks,
Riccardo
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