Hi Paul, Thanks for the clarification. If it turns out we can't use gl_ then I think it would be best to standardise on an osg_ModelViewMatrix and osg_ProjectionMatrix etc, for both GL2, GL3 and GL ES2, and for GL2 toggle between use gl*Matrix calls and setting the osg_*Matrix uniform depending upon when shaders are active or not. Using osg_*Matrix would preclude the use of the ftransform() convenience function though.
Robert. On Fri, Aug 14, 2009 at 6:07 PM, Paul Martz<[email protected]> wrote: > For the record, I was quoting the latest GLSL 1.50 spec, so "gl_" is > reserved, even for current OpenGL 3.2. > > If OSG provides a mechanism that allows the user to specify the names that > matrices are associated with, then OSG could go ahead and violate the spec > and use "gl_" names by default, but apps would still have the flexibility to > be spec compliant and change the names if they desired to do so. > > Paul Martz > Skew Matrix Software LLC > http://www.skew-matrix.com > +1 303 859 9466 > > Jason Daly wrote: > > Robert Osfield wrote: > > If GL3 isn't providing any gl_ uniforms surely they can't be reserved, > you can only reserve something if it might exists. I can see why gl_ > will be reserved for GL2, but I can't see the issue for non backwards > compatible GL3. > > > It doesn't provide uniforms, but there are gl_* identifiers still in use > (gl_Position, for example). > Besides, it doesn't really matter whether we think it's an issue or not. If > the spec says they're illegal, then the GLSL compiler will likely throw an > error any time a shader tries to use one that's not declared by GL itself (I > haven't tried this personally, but that's what I would expect) > > --"J" > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
