Hi Robbert,
I failed to get a good grip on how we could make this work, because of the
way the new attribute would interact with the existing mode;
from the spec (viewport_array.txt
<https://www.opengl.org/registry/specs/ARB/viewport_array.txt>):
Calling Enable or Disable with the symbolic constant SCISSOR_TEST is
equivalent, assuming no errors, to:
for (uint i = 0; i < MAX_VIEWPORTS; i++) {
Enablei(SCISSOR_TEST, i);
/* or */
Disablei(SCISSOR_TEST, i);
}
therefore the (existing) mode will replace the values set by the new
attribute, causing the state to leak in unexpected ways.
I will leave this as is for the moment, as I think the scissor array
would be usable with only a global on/off switch, and a buggy
implementation of the per-viewport on/off could be very confusing.
Regards, Laurens.
On Mon, Jun 6, 2016 at 1:22 PM, Robert Osfield <[email protected]>
wrote:
> Hi Laurens,
>
> I have just done a first pass review and left wondering if we might be
> able to leverage the existing
> StateAttribute::getMember()/getTypeMemberPair() functionality in some
> way. The osg::Light and osg::ColorMaski are examples of this in
> action. Could we do something here?
>
> Robert.
>
> On 3 June 2016 at 15:59, Voerman, L. <[email protected]> wrote:
> > Hi Robert,
> > in order to try stereoscopic rendering with a geometry shader I added
> > support for the GL_ARB_viewport_array extention. I got stuck at
> implementing
> > the SCISSOR_TEST array, as I cannot see where I could extend the osg
> with
> > an array replacing a boolean glMode. Any thoughts on that would be
> > appreciated.
> > Meantime I think the current code is usable (even without the ability to
> > enable/disable the scissor test per viewport).
> > Regards, Laurens.
> >
> >
> >
> > _______________________________________________
> > osg-submissions mailing list
> > [email protected]
> >
> http://lists.openscenegraph.org/listinfo.cgi/osg-submissions-openscenegraph.org
> >
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