A GPU card's support for OpenCL in OS X applications is not same thing as support for OpenCL patches inside Quartz Composer environment if I recall correctly. Somebody please fill in gaps/correct if I'm wrong.


On 24/07/2011, at 6:36 AM, Paul Harrison wrote:

I have constructed a simple .qtz composition using OpenCL Context Info patch which reports that my iMac has an OpenCl
  Device Count of 1,
  Device Type of CL_DEVICE_CPU, and
  Name of "Intel(R) Core(TM) i& CPU 860 @ 2.80GHz.

But, the iMac'a system info reports under Graphics/Displays that it also sports an
  ATI Radeon HD 4850:
  Chipset Model:        ATI Radeon HD 4850
  Type: GPU
  Bus:  PCIe
  PCIe Lane Width:      x16
  VRAM (Total): 512 MB
  Vendor:       ATI (0x1002)
  Device ID:    0x944a
  Revision ID:  0x0000
  ROM Revision: 113-B9110C-425
  EFI Driver Version:   01.00.383

And the Apple website http://www.apple.com/macosx/specs.html says:

"OpenCL
requires one of the following graphics cards or graphics processors:

NVIDIA GeForce 320M, GeForce GT 330M, GeForce 9400M, GeForce 9600M GT, GeForce 8600M GT, GeForce GT 120, GeForce GT 130, GeForce GTX 285, GeForce 8800 GT, GeForce 8800 GS, Quadro FX 4800, Quadro FX5600 ATI Radeon HD 4670, ATI Radeon HD 4850, Radeon HD 4870, ATI Radeon HD 5670, ATI Radeon HD 5750, ATI Radeon HD 5770, ATI Radeon HD 5870
AMD Radeon HD 6750M, AMD Radeon HD 6770M, AMD Radeon HD 6970M"

Seeing as how the official apple list of OpenCL supported graphics processors lists ATI Radeon HD 4850 and my machine reports having an ATI Radeon HD 4850 installed, why does Quartz Composer (version 4.0 103.1) not report it in the OpenCL Context Info?

The machine is running Mac OS X Version 10.6.8.

Paul




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