PURE DATA forum~

It's cool.
I also meet the same problem as you.
You work show us that we can build any effect from a very basic object in PD. It depend on your knowledge about CG. To me, GLSL is confusing, I have no enough background about it. The GLSL examples is too simple.
I hope pd will be more easy to use and flexible in visual field. At the same time, we need learn more.
Indeed, I learned from your patch. Thanks!

Last edited by audioripple (2010-12-19 16:09:07)

what im missing the most in this GLSL part is documentation about the linkage of pd and opengl/glsl. when i ask someone about shaders the most common answer is "read the red and the orange book ." but these say nothing about the implementation in pd.
like this float K stuff and how [GLSL program] works?
how to get changing parameters into the scrips?
there is nothing about the Geometry Shader at all?
in pd docu just the patches are explained, but not the shaders.

so i would be extremely thankful for some simple shader examples with every line of code explained.

btw.: thanks for the tip with the multitexture patch...i somehow got it working without exactly knowing what im doing.

really good thread-thanks for sharing all- GLSL shading is a good direction to move visuals forward in PD. A place to host  GLSL effects/patches would be great too

Hi there,

finally more interest in GLSL-Shaders :)

i would be really interested in sharing GLSL-Shaders. So far I've only written Fragment-Shaders for Image Filtering and/or Generation. The first one rendering the Mandelbrot-Set and the second one is coloring Image-Areas based on Brightness-Values (more or less a extended cv_threshhold)

My main interest here lies in creating Shaders for Computer Vision Applications, or replacing pd_opencv with Shaders, where possible and reasonable, because i'm stuck with an ATI-Card which doesn't support CUDA and OpenCL seems to be no fun so far :(

And yes i would be interested in a Google-Code Page.

Thanks, i looked in to that a while ago, but it has hidden somewhere on the requirements page, that you need a CUDA-Thingie...

Back to the Topic:
Based on this article here http://www.gamerendering.com/2008/10/11 … er-shader/ i created an abstraction which makes an blur-Effect. Unfortunately it only works with pix_video as input so far. When i try to use it on an pix_image -> pix_draw/pix_texture it doesn't work.

Any ideas how to Blur images,... etc?

Last edited by az (2011-01-12 13:52:04)

hey az

i get these errors...it doesnt want to link

error: [glsl_fragment]: shader not loaded
linking: link 9.80909e-45 7.00649e-45
linking: link 9.80909e-45 1.12104e-44
[glsl_program]: Info_log:
[glsl_program]: linking with uncompiled shader
[glsl_program]: Link failed!
[glsl_vertex]: Vertex_shader Hardware Info
[glsl_vertex]: ============================
[glsl_vertex]: MAX_VERTEX_ATTRIBS: 16
[glsl_vertex]: MAX_VERTEX_UNIFORM_COMPONENTS_ARB: 4096
[glsl_vertex]: MAX_VARYING_FLOATS: 64
[glsl_vertex]: MAX_COMBINED_TEXTURE_IMAGE_UNITS: 32
[glsl_vertex]: MAX_VERTEX_TEXTURE_IMAGE_UNITS: 16
[glsl_vertex]: MAX_TEXTURE_IMAGE_UNITS: 16
[glsl_vertex]: MAX_TEXTURE_COORDS: 8

i realized that i just installed a new ubuntu and its running without nvidia drivers...i guess thats the reason...will try again tomorrow

Nice thread ! I'm also curious about how to blur specific shapes in G.E.M., my goal is to provide a simple 'depth of field' effect, a kind of blur based on zbuffer.
The 2 solutions I see for now :

- repeat shapes (with [until] or glsl), because once repeated a lot forms could seems to be 'blurred', and more the form is far from the point of view more the shape is repeated
see Gem/examples/10.glsl/10.geometry.pd or Gem/examples/02.advanced/20.double-gemhead_vs_repeat.pd

- render a scene to a framebuffer, blur specific parts of the frame with a shader, based on zbuffer...

While searching for something complety different i stumbled over this Thread and felt like reinventing the wheel again...

http://lists.puredata.info/pipermail/pd … 51145.html

Does anyone know what happened to these shaders, did they find their way in to an external-collection?

Today I've spent some time working on shaders. As I am no expert in computer graphic technologies the patch below is a result of a simple trial and error process.

You'll find a pd implementations of two shaders together with a first try of an abstraction to make glsl shaders work just out-of-the-box. There is also an hypothesis of a "standard" for collecting glsl shaders. It's cheap stuff at the moment, but it works (at least it does on my Macbook Pro with 10.5 OSX).

More informations in the patch below, download and run "shader-help.pd".
Any feedback will be extremely appreciated.

edit: [patch deleted, needs some fixes and a lot more thought before being public]

Last edited by guido (2011-07-23 12:58:17)

See the french forum, some people are into glsl and made a collection of shaders : http://codelab.fr/2897

Last edited by dwan (2012-02-25 14:15:15)

Just a quick note of appreciation ad encouragement for you folks working on GLSL stuff for Pd. I'm an avid user of Jean-Pierre Lemoine's AVSynthesis, a program that combines OpenGL graphics manipulations with audio by Csound. It's a powerful combination that I'd love to see available on Pd.