Hi,
It might not necessarily be fast, as you'd be changing state that would
normally stay the same between consecutive draw calls, but you could also
change the scissor rectangle to the region you want to keep, or you could draw
a rectangle with the same depth as the text, then set the depth test to equal,
then draw the text. Other options include adding discards to the fragment
shader when the fragment is outside the rectangle (which can sometimes make all
draw calls that frame slower, not just the current one, especially on tiled
renderers like mobile GPUs and post-Maxwell Nvidia cards, so you'll want to
avoid this, too).
Cheers,
Chris
--
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=76859#76859
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