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Re: Custom Core Image filter help
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Re: Custom Core Image filter help


  • Subject: Re: Custom Core Image filter help
  • From: Nicko van Someren <email@hidden>
  • Date: Thu, 21 Feb 2008 22:08:40 +0000

On 20 Feb 2008, at 18:07, Daniel Thorpe wrote:

Hey Nicko, thanks for getting back to me...

No problem!

I am having some problems with my kernel code however, which I've changed as you suggested (I had already done this in my Obj-C implementation)...

This is my kernel code:
...
const float N = %.1lf;

I'd be inclined to make this an integer, since it will be easier for the compiler to deal optimise it out.


for(x=0.0; x<N; x++) {
...
}

You should be able to replace this with a call to dot(), if you set your Tchebichef image up correctly.


Unfortunately, this doesn't seem to work yet, as it crashed QuartzComposer instantly (as in as soon as I type in the kernel stuff with a suitable N. Which leads me to think, that it's syntactically correct, but essentially wrong....

That's odd, though I've managed to write kernel code that would crash my machine in the (distant) past.


So... have you got any other thoughts?

Making 'N' an integer might help the compiler. Other than that I don't have any ideas just now :-(


	Cheers,
		Nicko

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References: 
 >Custom Core Image filter help (From: Daniel Thorpe <email@hidden>)
 >Re: Custom Core Image filter help (From: Nicko van Someren <email@hidden>)
 >Re: Custom Core Image filter help (From: Daniel Thorpe <email@hidden>)

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