[PD] [GEM]: GL Shader Language

[Hans-Christoph Steiner]

On Jun 17, 2007, at 1:14 PM, cyrille henry wrote:

>
>
> 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?

Ok, no rush on getting them into CVS.  I was thinking even that it  
might make sense to make abstractions that wrap the Gem glsl shader  
loading stuff so people could just use them as Pd objects without  
knowing the details.

I think this would work well in the "externals" section, maybe as  
it's own lib, with the abstractions and the shaders.  And yes,  
licenses are important.

Also, look for some serious shader action from vade, who's mostly  
using Jitter these days.  Thanks to your examples, I think he'll  
start testing the shaders that he's writing with Gem in addition to  
Jitter (maybe he'll chime in here on this thread).

.hc

>
> 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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>>>>>>
>>>>>
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