We've seen that we have calls to glViewport(800, 600), mixed in with calls to 
the actual size of our viewport.

Is the final state.apply() call at the end of RenderStage::drawImplementation() 
intended to set things back to a default state after rendering everything?  
I've seen that RenderStage has a Viewport and applies it at the beginning of 
drawImplementation().  When I saw state.apply() putting in a different value, I 
thought it was a bug.  But if it returning things to a default value, I get it. 
 Is that what's happening?

thanks,
andy

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