[PD] pd/gem per-pixel image manipulation

[Martin Leopold Grödl]

hi marius & others,
thanks for pointing me to glsl, i will have a look!

but for now i think i found what's causing the trouble:
actually i want to apply per pixel manips continuously on a stream of 
pixes. eg. video from pix_film. so i was constantly triggering pix_dump 
with the gemhead. when triggering pix_dump manually it works fine.
(see attached test-patch)

i know it's not very efficient to do it like that in the first place 
(pix_dump/pix_set), but is there a way to properly "synchronize" it all?
i want to have a data flow like this: [gemhead] -> [pix_image] or 
[pix_film] -> [pix_dump] -> manipulate data -> [pix_set] -> output on screen

---martin.



marius schebella schrieb:
> hi martin,
> not sure where you want to go with that, but if you want to create 
> visuals stuff, you should dive into glsl programming and do your 
> manipulations in shader language. this is extremely efficient and fast.
> there are examples by cyrille and the pd montreal community (alexandre 
> etc). there is also a mailing list (glslang at dataflow.ws).
> for your patch it could be a triggerproblem, but difficult to say 
> without seeing it.
> marius.
> 
> Martin Leopold Grödl wrote:
>> hi everybody, i want to do per pixel image manipulation in gem 
>> (running pd.extended 0.39-3).
>> so far i've been trying pix_dump with a lister and then until with 
>> packel to access individual rgba values in a loop. after i do the 
>> manipulations i accumulate them back into a list using repack and send 
>> it to pix_set.
>>
>> it all works out pretty smooth. only problem is the list that gets 
>> sent to pix_set somehow seems to get one float prepended, which 
>> effectively shifts all the rgba-values one step and messes up the colors.
>>
>> any advice/examples on a correct pix_dump / pix_set setup? ...any 
>> other solutions?
>>
>> thx,
>> martin
>>
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