> What's the best way to "fallback" when a GPU doesn't have multi sample > antialiasing available? > Is there a reliable way to do a check for MSAA or give some conditional logic > that won't wind up with an app crashing?
best way to do fallback is to use a non-MSAA pixel format. As for a reliable way to check (I haven't actually tried this particular approach to my knowledge, but I've dealt with this exact same problem before, I just forget how): Ask for it (CGLChoosePixelFormat), and see if npix (the last argument, returned by reference) is 0 (meaning no renderers support that format) - that's a failure. Or you can see if CGLCreateContext gives you a NULL context (meaning it failed). Check for non-zero error codes returned from CGLChoosePixelFormat and CGLCreateContext. The software renderer doesn't support MSAA, only Supersampling (if I recall correctly), so it shouldn't muddy your capabilities check. -- Christopher Wright christopher_wri...@apple.com
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