Repeating the same test, I get quicker results with Native Core Image Rendering disabled. With it disabled, my fps hovers a range between 20~56fps, with much more time in the 50's. With it enabled, it reigns it in to between 19~30fps.
In general, I've noted better performance with it off. One thing that caused me to ask this was that I noted a composition (not of mine) that gained significantly from turning this off (around 20~30fps). Again, counter to what is apparently expected. -George Toledo On Mon, May 18, 2009 at 7:47 PM, Christopher Wright <[email protected]>wrote: > So, are you saying with it on it could be faster? >> >>> When it is on, we use [ciContext drawImage:], just like you would do in >>> your own code with a fully CI-based render chain. That's why it is fast, the >>> CoreImage framework can do their special optimizations and make it so. >>> >> > > Yes -- it saves some round-trip GL stuff (CIImage -> GL texture -> GL_QUAD) > to become (CIImage -> context). Behind the scenes, I imagine it's doing > something very similar, but CI has an advantage when it knows exactly how > many pixels are visible, how large the destination extent is, what parts are > offscreen, etc. with that extra information, it can potentially end up > doing less work (fewer pixels to evaluate, for example). > > For me, Video Input -> Gaussian Blur -> Billboard is about twice as fast > with Native Core Image Rendering enabled. This characteristic is probably > different for different video sizes (mine's 640x480) and GPUs (mine's a > GMA950). > > -- > [ christopher wright ] > [email protected] > http://kineme.net/ > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Quartzcomposer-dev mailing list ([email protected]) > Help/Unsubscribe/Update your Subscription: > > http://lists.apple.com/mailman/options/quartzcomposer-dev/gtoledo3%40gmail.com > > This email sent to [email protected] >
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