When you init your MSAA enabled NSOpenGLContext, check if it fails. If it fails, it the GPU doesn't supports MSAA, fallback to a "normal" context, and avoid MSAA related GL calls.
On Apr 19, 2012, at 11:18 PM, George Toledo wrote: > > What's the best way to "fallback" when a GPU doesn't have multi sample > antialiasing available? > > Right now, I'm setting up the NSOpenGLPixelFormatAttribute so that it uses > multisample. This works fine on my machine w/ nVidia 9400/9600, and I'm > guessing any other GPU that supports MSAA. > > So in the code, I setup the pixel format that calls MSAA, and if gl context > can't be set, then I provide it a pixel format that works on cards that don't > have multisampling available. I've tried a few variations on the pixel format > to use when there isn't MSAA available, but I can tell that's not the > problem. If I run just the "no MSAA" pixel format from start, everything is > ok on the older machines. > > I started out with the idea of doing that from the QCAdvancedPlayer / old > discussion and vimeo video about enabling multisampling in an app from Vade > and TobySpark. When I run that code on my old white macbook (intel X3100 > series GPU, I think it was called), it also fails, so it's not some rogue > problem elsewhere in my code. > > 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? I'm almost not too worried about it, > because there are so few machines that don't support MSAA nowdays... and I > can keep around an alternate build for older machines. I'd rather handle the > pixel format switch in the app itself if possible. > > I don't want to cross-post this, but if it's a more appropriate for another > list (cocoa, openGL, quartz?), let me know. > > -gt > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Quartzcomposer-dev mailing list (Quartzcomposer-dev@lists.apple.com) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/quartzcomposer-dev/info%40cogevj.hu > > This email sent to i...@cogevj.hu
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