I downgraded to the latest Linux NVidia "legacy" driver and the problem
went away.
...go figure...
Full speed ahead!
On Tue, 2008-03-11 at 13:19 -0700, Mark Sciabica wrote:
> Check that new text code I posted. I initially had problems handling
> the space character because it's implemented as having zero height and
> width.
>
> First make sure I sent you the right version: fHorizQuadMargin and
> fVertQuadMargin initialization should be checking for vDiff nonzero
> before dividing. My driver didn't like when I forgot to do that. Also,
> the code assumes that the texture width/height are nonzero. If this
> assumption is incorrect, the division by zero at that point might be
> causing a problem.
>
> Other than that, the only thing I can see a driver tripping up on is
> creation of a zero area quad (which a space will end up being) with
> different texture coordinates at each vertex. This will give an
> infinite rate of change of texture coordinates across the primitive
> which might be confusing the driver.
>
> To see if this is the problem, try the following code to avoid adding
> unnecessary margins to zero width glyphs.
>
> float fHorizTCMargin = 1.0f / glyph->getTexture()-
> >getTextureWidth();
> float fVertTCMargin = 1.0f / glyph->getTexture()-
> >getTextureHeight();
> float fHorizQuadMargin;
> if (vDiff.x() == 0.0f)
> {
> fHorizQuadMargin = 0;
> }
> else
> {
> fHorizQuadMargin = width * fHorizTCMargin /
> vDiff.x();
> mintc.x() -= fHorizTCMargin;
> maxtc.x() += fHorizTCMargin;
> }
> if (vDiff.y() == 0.0f)
> {
> fVertQuadMargin = 0;
> }
> else
> {
> fVertQuadMargin = height * fVertTCMargin /
> vDiff.y();
> mintc.y() -= fVertTCMargin;
> maxtc.y() += fVertTCMargin;
> }
>
> On Mar 11, 10:46 am, Jeremy Moles <[EMAIL PROTECTED]> wrote:
> > I tagged a 0.1.6 of osgWidget:
> >
> > http://osgwidget.googlecode.com
> >
> > I really wouldn't even bother posting about it to be honest but I need a
> > bit of help if anyone is willing to try it. :)
> >
> > Upon building osgWidget (you'll want to get the monospace font and the
> > osgText.cpp patch for maximum font clarity, but they aren't necessary),
> > run the osgwidgetinput example and press the following keys:
> >
> > n
> > SPACE
> >
> > Where that's the actual key 'n' and the spacebar. Something really
> > bizarre is happening on my machine and I'm beginning to think it's a
> > driver bug... what happens though is that I get an Floating Point
> > Exception inside of NVidia's libGL, and it seems to have something to do
> > with the "space" character in some context. If you immediately insert a
> > space character, you can then follow that with any series of key presses
> > you like, including spaces or otherwise.
> >
> > Anyways, this isn't a big deal (I'm sure I'll get it figured out), but I
> > just wanted to let folks know I'm still alive and things are chugging
> > along slowly. :)
> >
> > (I've been extremely busy these last few weeks writing some
> > system-auditing software in Python for a client, and haven't had much
> > time for hobby code...)
> >
> > _______________________________________________
> > osg-users mailing list
> > [EMAIL
> > PROTECTED]://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph...
> _______________________________________________
> osg-users mailing list
> [email protected]
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>
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