[PD] Pd and gpgpu

[marius schebella]

hmm, I tried it, because I thought, that's it, but somehow it is not 
working.
the problem is, that pix_snap is not working as expected:
after "do some stuff" I am still on the graphics card, basically I 
created a texture, that I can reference as ID. and pix_snap, I don't 
know, does not create an output...

[gemhead]
  |
  |       [ID\
  |        |
[pix_texture]
  |
[pix_snap]
  |
[pix_pix2sig~ 8 8]
  | | |
[dac~ 1 2 3]

marius.

Roman Haefeli wrote:
> yo, ignore me, if i am saying something absolutely stupid and unrelated,
> but isn't that exactly, what [pix_sig2pix~] and its counterpart
> [pix_pix2sig~] do? of course you still would have to [pix_texture] first
> in order to transfer the data to the gpu and then afterwards [pix_snap]
> it to bring it back from gpu to a pix. 
> 
> audioIn~
> |
> [pix_sig2pix~]
> |
> [pix_texture]
> |
> [doSomeStuff]
> |
> [pix_snap]
> |
> [pix_pix2sig~]
> |
> audioOut~
> 
> from my experience, doing just all this transfers is pretty slow
> (especially [pix_snap], as others already mentioned)
> 
> roman
> 
> 
> 
> On Sat, 2007-11-10 at 13:59 -0500, vade wrote:
>> Max MSP/Jitter has bridge objects that convert from audio rate to  
>> matrices and back, which would be needed in PD land to readback from  
>> the GPU, and convert to an audio rate signal. Thats how this is done.  
>> Otherwise i have no idea how you would implement souch a patch.
>>
>>
>> On Nov 10, 2007, at 8:55 AM, Georg Holzmann wrote:
>>
>>> Hallo!
>>>
>>>> it is true that the gpu is unused most of the time and could be  
>>>> used to
>>>> do fast calculations, but the main output for graphicscards is the
>>>> screen and reading back into ram can be slow. (of course "slow" is a
>>>> relative term). I also see a problem in the different formats for  
>>>> audio
>>>> and images. most graphics cards are optimized for vec4 processings (4
>>>> parallel color channels). and audio...
>>> Well, there are already quite some papers/software for audio  
>>> processing
>>> on the gpu (see e.g.
>>> http://www.gpgpu.org/cgi-bin/blosxom.cgi/Audio%20and%20Signal%20Processing/index.html) 
>>> .
>>>
>>> But AFAIK nobody did this with pd up to now ...
>>>
>>> LG
>>> Georg
>>>
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