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

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http://forum.openscenegraph.org/viewtopic.php?p=76859#76859





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