RADAR 8978912 submitted.

a|x



--- On Wed, 9/2/11, Alex Drinkwater <the_vo...@yahoo.co.uk> wrote:

From: Alex Drinkwater <the_vo...@yahoo.co.uk>
Subject: Re: Image Feedback Memory Leaks
To: "Achim Breidenbach" <ac...@boinx.com>, "Chris Wood" <pson...@gmail.com>
Cc: quartzcomposer-dev@lists.apple.com
Date: Wednesday, 9 February, 2011, 20:45

Hi Chris,
I don't think the problem is to do with feedback per-se: it's the Feedback 
patch, specifically. Using the Core Image Accumulator patch seems OK (is that 
what you meant?). There's clearly some fundamental underlying issue though, so 
I'm going to file a bug.
Cheers,
a|x
--- On Wed, 9/2/11, Chris Wood <pson...@gmail.com> wrote:

From: Chris Wood <pson...@gmail.com>
Subject: Re: Image Feedback Memory Leaks
To: "Achim Breidenbach" <ac...@boinx.com>
Cc: "Alex Drinkwater" <the_vo...@yahoo.co.uk>, 
quartzcomposer-dev@lists.apple.com
Date: Wednesday, 9 February, 2011, 11:50

Reposted to the whole
 list, instead of just Alex:
No time to check just now, but are you using it with core image? I use feedback 
heavily without any major leaks in some of my projects, but I've switched to 
pure GLSL. I definitely had major leaks with core image before.

Chris

On 9 February 2011 11:43, Achim Breidenbach <ac...@boinx.com> wrote:

Hi Alex,



same issue with my hardware: iMac, NVIDIA GeForce GT 130



I also exchanged the image input into the feedback patch, as well as the image 
filter inside, but still the same problem.



I am not sure, if you are searching for a workaround or collecting data for 
filing a bug? You can certainly do the same feedback thing with an image 
accumulator patch.



best,



Achim Breidenbach

Boinx Software



On 09.02.2011, at 11:25, Alex Drinkwater wrote:



> I've noticed what seems to be a massive memory leak when using the Feedback 
> patch with images. The attached file illustrates a simple case. I find that 
> the framerate drops rapidly when running the composition. Can anyone else 
> confirm that the same thing happens on their hardware?


>

> I've also tried using a Queue patch to implement image/video feedback in a 
> similar way, with the same disappointing result.

>

> I seem to remember also using an undocumented JavaScript feature in a Core 
> Image Kernel to implement feedback in a previous version of Quartz Composer, 
> and hitting the same issue. The two issues may be completely unrelated, 
> however.


>

> a|x

>

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