[osg-submissions] State.cpp

[Joseph Steel]

On the machine that I've been using _glMaxTextureCoords is 1 and
_glMaxTextureUnits is 4! Using _glMaxTextureCoords in the test therefore
prevents me using the other texture units.

Ahh! On this machine calling:
 glGetIntegerv(GL_MAX_TEXTURE_COORDS,&_glMaxTextureCoords);

gives an error in initializeExtensionProcs() (GL_INVALID_ENUM = pname was
not an accepted value). As the value of _glMaxTextureCoords is initialised
to 1 then this value remains.

The driver on this machine supports OpenGL v1.5 100% but not 2.0. Would I be
right in thinking that GL_MAX_TEXTURE_COORDS is in OpenGL2.0 and not
necessarily in earlier versions?

If this is the case, as it seems, what's the solution? The answer isn't
update the drivers on my machine!

Joseph


-----Original Message-----
From: osg-submissions-bounces at lists.openscenegraph.org
[mailto:osg-submissions-bounces at lists.openscenegraph.org]On Behalf Of
Farshid Lashkari
Sent: 19 November 2007 17:07
To: OpenSceneGraph Submissions
Subject: Re: [osg-submissions] State.cpp


Hi Joseph,

The documentation for glClientActiveTexture says the index can range
from 0 to GL_MAX_TEXTURE_COORDS - 1, so I believe the current behavior
is correct. Here is the link to the documentation for this command on
the OpenGL site:

http://www.opengl.org/sdk/docs/man/xhtml/glClientActiveTexture.xml

-Farshid

On Nov 19, 2007 3:20 AM, Joseph Steel <joseph.steel at simutecsystems.com>
wrote:
>
>
>
>
> In osg Ver2.2 public release osg::State::setClientActiveTextureUnit
> (State.cpp, line759) the test (I think) should be:
>
> if (_glClientActiveTexture && unit < (unsigned int)_glMaxTextureUnits)
>
> and not _glMaxTextureCoords.
>
> I've attached a modified version of the file (osg\State.cpp)
>
> Joseph Steel
> _______________________________________________
> osg-submissions mailing list
> osg-submissions at lists.openscenegraph.org
>
http://lists.openscenegraph.org/listinfo.cgi/osg-submissions-openscenegraph.
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>
>
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