[osg-users] Use OSG with an existing renderer in OpenGL ES

[Chris Hanson]

Fabien, if you want someone do do a custom implementation of that sort of
thing, we can be hired to do so. ;)

On Mon, Nov 21, 2016 at 7:27 AM, Riccardo Corsi <riccardo.corsi at kairos3d.it>
wrote:

> Hi Fabien,
>
> in your situation the approach suggested by Chris is certainly the most
> promising.
> Create a second GL context (shared), render everything you need to with
> osg in the second context to an FBO target and have Qt retrieve the fbo's
> texture content, to display it in one of its widgets/primitives.
> This way you don't need to know which GL states Qt/qml uses and/or
> modifies and you're sure neither qml nor osg rendering will be corrupted.
>
> You can find a sample integration I wrote some times ago here:
> https://github.com/rickyviking/qmlosg
> and a more recent example here: https://github.com/podsvirov/osgqtquick
>
> Ricky
>
>
> On Mon, Nov 21, 2016 at 11:52 AM, Robert Osfield <robert.osfield at gmail.com
> > wrote:
>
>> On 21 November 2016 at 09:12, Fabien Boco <fabien.boco at gmail.com> wrote:
>> > This is why I'm looking for an OpenGL ES alternative for
>> glPush/PopAttrib which works fine on the Windows version application.
>>
>>
>> The alternative to using glPush/glPop on the OSG would be to dirty the
>> associated modes and attributes that are tracked in osg::State.  In
>> osg::State there are series of haveApplied*() methods to help with
>> tell the OSG's state tracking mechanism something has externally
>> changed.  This requires you to know what modes and attributes will
>> have been changed by the 3rd party code so it's not an easy
>> alternative to glPush/glPop.
>>
>> Personally I find Qt's approach of changing GL state problematic, I
>> much prefer windowing libraries to just create a graphics context and
>> leave GL work entirely to dedicated graphics libraries.
>>
>> Robert.
>> _______________________________________________
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>> osg-users at lists.openscenegraph.org
>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>>
>
>
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>


-- 
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