It's fixed!
Code:
osg::ref_ptr<osg::BlendFunc> blendFunc = new
osg::BlendFunc(osg::BlendFunc::SRC_ALPHA, osg::BlendFunc::DST_ALPHA,
osg::BlendFunc::ZERO, osg::BlendFunc::ONE);
label->getOrCreateStateSet()->setAttributeAndModes(blendFunc);
I didn't know you could/should specify the alpha blending separately.
Now it doesn't overwrite the alpha anymore. It also means I HAVE to draw a
background for the label first, or else it will not be visible... but that's a
minor inconvenience, I don't think my idea "only write alpha when it's higher
than destination alpha" is actually possible in openGL. Somehow I assume that
it worked that way because it seems intuitive in the situation I am working
with..
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=60388#60388
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