Okay, I finally did the obvious and searched the list. We have covered this territory a few times before, and Chris Wright @ Apple was able to tell us that the apple list of OpenCL supporting cards is not dispositive:
"It's potentially correct/up-to-date, but it may not be enough for QC. QC requires some additional CL features, and it might be those extensions that the card doesn't support." Intriguing, but vague. "Some additional features" are required, and "those extensions" may not be supported. I guess the output of the OpenCL Context Info patch is what passes for documentation of supported cards. Ah, well. Par for the course. ________________________________ From: Paul Harrison <harrisonpa...@yahoo.com> To: "quartzcomposer-dev@lists.apple.com" <quartzcomposer-dev@lists.apple.com> Sent: Sunday, July 24, 2011 9:16 AM Subject: Re: OpenCL Supported Cards @george: The OpenGL Info patch reports the Radeon HD 4850 as Render Device with 8 texture units and Max Texture Size of 8192. So QC definitely sees the gpu. It just does not choose to use it for OpenCL. @vade: By "image buffer support" do you mean OpenGL context sharing? I get the sense that the AMD 4xxx series has some design limitations in local data sharing. OpenCL / Open GL versions above the OpenCL 1.0 and OpenGL 3.3 supposedly supported by OS X 10.6 and Radeon 4850 seem to focus a good deal on better OpenCL / OpenGL integration. Maybe Quartz Composer wants some of that sharing goodness that was only supported by extensions and specific cards back in the SL birthing timeframe? I guess it is pretty clear that the Radeon HD 4850 is does not support OpenCL acceleration in the context of SL and Quartz Composer. I just wish I could see the Apple document(s) that told me so, since what I have seen "suggests" support.
_______________________________________________ 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: http://lists.apple.com/mailman/options/quartzcomposer-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
