On Tue, 2007-06-19 at 11:31 -0400, Jeremy L. Moles wrote:
> On Tue, 2007-06-19 at 17:13 +0200, Stephan Maximilian Huber wrote:
> > Hi Jeremy,
> >
> > the video looks very nice. I am also investigating cairo and osg ( I
> > need to import SVG files for a new application) and it works ok.
> > Jeremy L. Moles schrieb:
> > > - The window "borders" are drawn using Cairo (so that they're nice and
> > > round and antialiased). They can be scaled to any size without loss in
> > > clarity (but suffer from the fact when drawn, they don't perfectly blend
> > > to the most discerning eye because they're actually rendered on a full
> > > transparent surface and not on top of the actual OpenGL scene/color
> > > buffer).
> > >
> > If I understand you correctly, then you can fix this very simple:
> > Cairo uses premultiplied alpha, if you change your blendfunc, your
> > alpha should be ok again.
> >
> > geode->getOrCreateStateSet()->setAttributeAndModes(new
> > osg::BlendFunc(osg::BlendFunc::ONE,
> > osg::BlendFunc::ONE_MINUS_SRC_ALPHA));
>
> Wow, that made a huge difference. :) I'm tempted to make another video
> just to show the amazing difference in quality...
Okay, yeah, couldn't resist:
Original (bland): http://cherustone.com/osgHUD.avi
New (bright!): http://cherustone.com/osgHUD2.avi
> Out of curiosity, is your code public? I'm curious to see how someone
> else integrated Cairo and OSG. You can find my implementation (osgCairo)
> here:
>
> svn co http://svn.const.lugatgt.org/osgCairo/trunk
>
> Are you somehow directly using the main OpenGL color buffer as your
> surface (is this even possible?) Are you drawing on individual textures
> (also Cairo surfaces) similar to me?
>
> Perhaps I can steal all your good ideas and we could call it
> "collaboration!?" :) *grin*
>
> > here's my demo-screenshot ;-)
> >
> > cheers,
> > Stephan
> >
> >
> >
> >
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