It really depends on what the GUI is for? The 3d gui lib I recently wrote was pixel perfect but it was not necessary to use single surfaces for multiple gadgets. Each gadget is a separate quad entity which makes managing / manipulating them easier. Single surface is good for rendering in terms of raw speed but I don't think it's necessary for a GUI unless you have alot of gadgets on screen. It's a case of trading speed over flexibility - I choose the later.
Single Surface GUI - good | bad idea?
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