Re: [osg-users] osgViewer Threading Model problem.

[Robert Osfield]

HI Dario,

On 1 July 2016 at 14:26, Dario Minieri  wrote:
> All data change on osg tree are made inside callback, so theoretically we 
> have no "parallel" change during frame. However there are a lot of visitors 
> that I have to check, may be could do data alteration. In my test, actually, 
> there is osgHimmel and osgOcean also inside scene.
>
> This type of problem, anyway, is generated by osg tree alteration parallel to 
> frame only?

The DrawThreadPerContext threading model enables the draw thread of
one frame to run in parallel with the update, event and cull
traversals of the next frame.  This means that if you modify Drawable
or StateSet/Texture etc. state within the update, event or cull
traversals then you'll end up with a race condition.

The OSG uses a osg::Object::setDataVariance(osg::Object::STATIC |
osg::Object::DYNAMIC) hint to tell the draw traversal whether it's
safe the next frame proceed.  The way it works is the draw traversal
holds back the next frame till all the Drawable and StateSet's marked
with DYNAMIC DataVariance are dispatched.

My best guess is that you're modifying some state or drawable in the
update or event traversal (via callback for instance) without marking
the Drawable's or StateSet that encloses the dynamic state with a
DataVaraince of DYNAMIC.

Robert.
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Re: [osg-users] osgViewer Threading Model problem.

[Dario Minieri]

Hi,

All data change on osg tree are made inside callback, so theoretically we have 
no "parallel" change during frame. However there are a lot of visitors that I 
have to check, may be could do data alteration. In my test, actually, there is 
osgHimmel and osgOcean also inside scene.

This type of problem, anyway, is generated by osg tree alteration parallel to 
frame only? 

Thank you!

Cheers,
Dario

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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=67955#67955





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Re: [osg-users] osgViewer Threading Model problem.

[Robert Osfield]

Hi Dairo,

Are you modifying data during the frame?

Robert.

On 1 July 2016 at 10:13, Dario Minieri  wrote:
> Hi,
>
> I'm using SingleThreaded model inside the Viewer. Using another model 
> threading like DrawThreadPerContext I have various errors like:
>
> Warning:TextureRectangle::apply(..) failed, texture rectangle is not support 
> by your OpenGL drivers.
>
> and
>
> Warning: RenderStage::runCameraSetUp(State&) Pbuffer does not support 
> multiple color outputs.
>
> That is strange, because the card is Nvidia GTX 770, driver 352.63 which have 
> to support texturerectangle...
>
> Have you some ideas about this problem?
>
> Thank you!
>
> Cheers,
> Dario
>
> --
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=67949#67949
>
>
>
>
>
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[osg-users] osgViewer Threading Model problem.

[Dario Minieri]

Hi,

I'm using SingleThreaded model inside the Viewer. Using another model threading 
like DrawThreadPerContext I have various errors like: 

Warning:TextureRectangle::apply(..) failed, texture rectangle is not support by 
your OpenGL drivers. 

and

Warning: RenderStage::runCameraSetUp(State&) Pbuffer does not support multiple 
color outputs.

That is strange, because the card is Nvidia GTX 770, driver 352.63 which have 
to support texturerectangle... 

Have you some ideas about this problem?

Thank you!

Cheers,
Dario

--
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=67949#67949





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