[osg-users] [osg-submissions] GL3 Mac OS X needs VertexArrayObject

[Mathieu MARACHE]

Hi Robert,

Indeed VAO support is needed (in obligatory sense) for Macosx Core Profile
targets but would be useful to other platforms also since it would make the
system more efficient.

I'm putting osg-users's mailing list in copy to see if someone has more
insight into VAO.

I've tried to setup VAO inside Geometry and make appropriate calls when
needed but fail to show more than one geometry...

I was on OpenSceneGraph-3.4 branch, I will try to setup a working branch
from master to show what I came up with. We can discuss on what would the
appropriate route should be to implement this. As you mentioned it would
imply osg::Geometry and maybe also osg::State modifications...

Regards

--
nǝıɥʇɐƜ

On 9 June 2016 at 09:19, Robert Osfield <robert.osfield at gmail.com> wrote:

> Hi Mathieu,
>
> On 9 June 2016 at 07:44, Mathieu MARACHE <mathieu.marache at gmail.com>
> wrote:
> > I'm struggling to understand what to do. I merely put up a solution that
> was
> > explained in a staled thread from 2012 (!), subject was : OpenGL 3.2
> support
> > in OS X 10.7 (Lion)
>
> This was clearly just a hack to get things "working" not an actual
> solution.
>
>
> > I see your points, you are right this is not a general solution.
> >
> > I'll be reading a bit more on VAO and try to add VAO support directly in
> > Geometry is possible...
>
> I would be worth just moving the discussion about VAO support to
> osg-users so we can all discuss the what solution.  I'm happy to pitch
> in some time to getting this resolved for 3.6.
>
> Right now from what I've learnt that natural place for binding the VAO
> would be in osg::Geometry.  It may be that osg::State would be the
> part of the OSG that does the binding as it already manages the vertex
> arrays and associated buffer objects.    The VAO essentially wraps up
> all the vertex array settings in one place so that once it's set up
> one just binds a single VAO object rather than a VBO and then specify
> the individual vertex arrays within this.  In theory this should mean
> the system is more efficient - as long as we get the design and
> implementation right.
>
> Robert.
> _______________________________________________
> osg-submissions mailing list
> osg-submissions at lists.openscenegraph.org
>
> http://lists.openscenegraph.org/listinfo.cgi/osg-submissions-openscenegraph.org
>
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