[PD] GEM noobie: I don't understand this glsl thing... but I need it!

Dan Wilcox danomatika at gmail.com
Mon Sep 9 23:21:57 CEST 2013

glsl is the open gl shader language ... basically a simple C-like language for doing graphics stuff on the GPU, see https://en.wikipedia.org/wiki/GLSL

Also, see the OpenGL Orange Book

On Sep 9, 2013, at 5:01 PM, pd-list-request at iem.at wrote:

> From: David Schaffer <schafferdavid at hotmail.com>
> Subject: [PD] GEM noobie: I don't understand this glsl thing... but I need it!
> Date: September 9, 2013 4:24:08 PM EDT
> To: pd list <pd-list at iem.at>
> Hi there, 
>               I'm in the process of writing my own photo stitching/assembling abstraction but I'm having a lot of trouble understanding what the glsl object do... I've been able to implement an edge blurring function by copy/pasting the glsl code from the "panoramique.pd" patch and the "panoramique.vert" and "panoramique.frag" files to the right places, but it only blurs vertical edges. Can anyone tell me how I could blur horizontal edges too? and... what this glsl thing is all about. I'm no code expert, so please keep it understandable (!) 
> Thanks a lot, 
> David
> http://www.flickr.com/photos/schafferdavid/
> https://soundcloud.com/schafferdavid

Dan Wilcox

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