Have you looked at the CGDirectDisplay API?

http://developer.apple.com/technotes/tn/tn2007.html

-Todd Blanchard

On Tuesday, August 5, 2003, at 01:06  PM, John M McIntosh wrote:

>
> On Tuesday, August 5, 2003, at 11:11  AM, Nevin Pratt wrote:
>> Of course, OS/X is the latest incarnation of NeXTSTEP.  And, in the  
>> good ol' NeXTSTEP days, there was a kit/library available that would  
>> bypass the NeXTSTEP Display Postscript primitives (with OS/X, that  
>> would be the Quartz stuff, I guess) and render directly to the  
>> framebuffer.  Without such bypassing, graphically intensive apps ran  
>> excrutiatingly slow.
>>
>> Nevin
>
> Yes but as mentioned there doesn't seem to be a way to get around all  
> the Quartz stuff. Perhaps open/gl? but
> an easy solution I've not yet discovered, open of course to  
> suggestions...
> --
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> ====
> John M. McIntosh <johnmci at smalltalkconsulting.com> 1-800-477-2659
> Corporate Smalltalk Consulting Ltd.  http://www.smalltalkconsulting.com
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>