[PD] [GEM]: GL Shader Language

[cyrille henry]

Alexandre Quessy a écrit :
> Eh Jack !
> Very nice examples, yes. Cyrille, do you think that one should
> understand C programming in order to use Pd? I don't.
i don't see your point here.
glsl programming is not very diferent from C. So, understanding C is good for learning glsl.
but you don't nead glsl in order to use pd.
you just need glsl if you want to do very heavy pixel processing at 50fps / 1024x768 without using any  CPU time by exemple.


> Of course, its
> low-level orientation makes it perfect for someone to learn lower
> level stuff.
> 
> Anyways, I added an abstraction for shaders in the PdMtlAbstractions.
> See https://devel.goto10.org/pdmtl/browser/trunk/pdmtl/gems

cut / paste the help file is (for me) easier to use, as i usually put the shader in in the same directory as my patch, so i don't nead to provide the full path for the shader. (and the patch could run on other computer without changing all path).
is there a solution for an abstraction to know the directory of it's parent patch?

cyrille
 
> 
> a
> 
> 
> 2007/6/19, jack at rybn.org <jack at rybn.org>:
>> Yep, very interesting example !
>> You can "boost" Gem with glsl object.
>> Is there workshop in Paris about that Cyrille ?
>> I think, that it would be interesting to do.
>>
>> Jack
>>
>> >
>> >
>> > Hans-Christoph Steiner a écrit :
>> >>
>> >> On Jun 17, 2007, at 6:58 AM, cyrille henry wrote:
>> >>
>> >>> hello,
>> >>>
>> >>>
>> >>> Kyle Klipowicz a écrit :
>> >>>> Ooop please send any elementary examples of these things.
>> >>>
>> >>>
>> >>> i post a few very diferents shader and the pd patch to use them 
>> here :
>> >>>
>> >>> http://drpichon.free.fr/gem_glsl_ch_200070617.zip
>> >>
>> >> Wow, these are some nice examples, these should be included in the
>> >> "examples" section of Pd-extended.
>> >>
>> >
>> > well, i think i should clean up some code and check licence for the 
>> shader
>> > i did not write.
>> > where should i put them in order to include them in pd-extended?
>> >
>> > cyrille
>> >
>> >> .hc
>> >>
>> >>>
>> >>>
>> >>>> I got
>> >>>> confused by the Gem docs (they don't explain OpenGL as thoroughly as
>> >>>> the vanilla Pd-docs explain DSP).
>> >>>
>> >>> Gem doc aim is to explain gem specific stuf. but in order to use Gem,
>> >>> you also need a good openGL book.
>> >>> (you can find lot's of them)
>> >>>
>> >>> cyrille
>> >>>
>> >>>
>> >>>>
>> >>>> ~Kyle
>> >>>>
>> >>>> On 6/17/07, cyrille henry <cyrille.henry at la-kitchen.fr> wrote:
>> >>>>> hello,
>> >>>>>
>> >>>>> Alexandre Quessy a écrit :
>> >>>>>> Hi all !
>> >>>>>> The Toon.vert and Toon.frag shaders don't seem to work quite well
>> >>>>>> here. I only get some kind of darker or lighter grey depending on
>> >>>>>> the
>> >>>>>> value of the "Phong" variable I set it to have. I am using
>> >>>>>> Pd-extended
>> >>>>>> 0.39-2 test 5 on Ubuntu Linux Intel. Gem is 0.91-cvs compiled 
>> on Mar
>> >>>>>> 16 2007. Should I generate something any better ?
>> >>>>> this is exactly what the toon shader is aiming to do.
>> >>>>> look at it's code to undersant why.
>> >>>>>
>> >>>>>>
>> >>>>>> Anyone has an other GLSL shader to suggest to try it with ?
>> >>>>>
>> >>>>> yes, google has a lot.
>> >>>>>
>> >>>>> i have a few other exemple on my computer, tell me if you're 
>> looking
>> >>>>> for some specific stuf.
>> >>>>>
>> >>>>>
>> >>>>> cyrille
>> >>>>>
>> >>>>>
>> >>>>>>
>> >>>>>> Thanks !!
>> >>>>>>
>> >>>>>> a
>> >>>>>>
>> >>>>>> 2007/6/16, chris clepper <cgclepper at gmail.com>:
>> >>>>>>> GEM is a bit easier to deal with for shaders since there is no 
>> need
>> >>>>> to do
>> >>>>>>> any specific wrapper.  Any ARB_ vertex or fragment shader and any
>> >>>>>>> GLSL
>> >>>>>>> shader you find on the web can work in GEM without modification.
>> >>>>> In some
>> >>>>>>> cases you might need to change something in the shader text to 
>> deal
>> >>>>> with
>> >>>>>>> rectangle vs 2D textures.
>> >>>>>>>
>> >>>>>>>
>> >>>>>>> On 6/16/07, Cypod <cypod25 at gmail.com> wrote:
>> >>>>>>>>
>> >>>>>>>> On the cycling74 webpage there is an interesting article about
>> >>>>> writing
>> >>>>>>> shaders for jitter:
>> >>>>>>>>   http://cycling74.com/story/2007/5/23/181113/507
>> >>>>>>>>
>> >>>>>>>>
>> >>>>>>>>
>> >>>>>>>>
>> >>>>>>>> is there a similar function available for GEM? Has anyone had
>> >>>>> experience
>> >>>>>>> with doing this?
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>> ---------------------------------------------------------------------------- 
>>
>> >>
>> >>
>> >>                                               http://at.or.at/hans/
>> >>
>> >>
>> >>
>> >>
>> >
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