Hi everyone,we are in a little bit of a pickle here the sample code i attached really has major performance issues on the new NVIDIA GeForce 9600M GT OpenGL Engine (interestingly enough it is almost as bad as the on board one) but runs really well on the ATI of the second generation macbook pros and imacs (ATI Radeon X1600) and we can't really figure out why.
So what we do is essentially the QuartzComposerTV sample code, and add in on composition that runs perfectly on its own with it's 60 fps, but totally screws up everything when drawn in the same context together with other composisions. Which is what this sample code does: it renders a stack of Composition into an OpenGL context. To make it more like we really do it i put the rendering into a extra thread and a pixelbuffer, which is in turn put into an opengl view by drawing a quad with the pixelbuffer as a texture. Focus of this example is how many renderings the background thread can do, not if we display every rendering.
I also narrowed it down to the zodiac sings composition having many images as an input which travel down through iterators. E.g. when instead of sending in 12 different zodiac signs send in only one then it works nicely at high speed.
What are my questions:- do we anyhting wrong in setting up the contexts and pixel buffers that is hurtin on nvidia but not on ati? - do we maybe need to do some clearing or cleanup between rendering the compositions? - has quartz composer performance issues on nvidia that it has not on the ati cards? - in our actual application we have a lot of other pixelbuffers and contexts in place and there it hurts even more as in this sample. seems like resource run out and textures are swapped/uploaded every frame or something the likes of it
we are glad for any help we can get! the sample code can be found at: http://public.me.com/nikdo - QCTV-nvidia-problem.zipit performs at 756x512 at ~44fps on the ati macbook pros, and ~30fps on the new macbook pro... here
best, dom -- Dominik Wagner Mail: [EMAIL PROTECTED] TheCodingMonkeys http://www.codingmonkeys.de/ Blog - DasGenie: !Scrap http://scrap.dasgenie.com/
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