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Re: Drawing to NSView with OpenGL questions

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Re: Drawing to NSView with OpenGL questions

Subject: Re: Drawing to NSView with OpenGL questions
From: Erik Buck <email@hidden>
Date: Sun, 10 Feb 2008 12:18:27 -0500

It is easy to overlay gl over quartz or quartz over gl, but it's tricky to interleave them. Approaches for overlays include the following samples : <http://developer.apple.com/cgi-bin/search.pl?q=gl+NSView&num=50&site=(samplecode) >

If you must interleave gl and quartz, render quartz drawing into gl textures and draw with gl You are correct that reading back from VRAM is seldom the right solution. Instead of reading your gl images back from the card, write your quartz images to the card and do the mixing there. This sample shows one approach: http://developer.apple.com/samplecode/CocoaGL/listing10.html

Core Animation in Mac OS X 10.5 essentially draws with quartz into gl textures when views are layer backed. _______________________________________________

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