Some ShaderToy shaders converted for Processing

Comments

• kfrajer

  January 2018

  Thxs for sharing. Tagging @nabr.

  Kf
• nabr

  January 2018 edited January 2018

  Yeah, nice!

  You could teak it a bit, if you like to.
  Shadertoy using WebGL 2.0 means #version 300 es.
  Default in processing OpenGL version 120 or #version 100 es.

  Means gl_Fragcolor is deprecated. It works in Java, and this is great. I don't think this is a performance lost. But you know, just to be nice to the compiler ... So the best way would be if you copy +paste a String befor every shader, like shadertoy. with the version and the main function.

  Second if you not going to use a 3D Shape like a cube, sphere -
  you don't really need to do a Post Processing step like processing's filter() method. This will read all pixels form the Framebuffer -->make a rect -->send it to the shaders -->Colorbuffer, calling shader() and rect() directly will be a performance boost.

  @cansik have a nice lib for this kind of stuff, make a pull
  https://github.com/cansik/processing-postfx
• cansik

  February 2018

  @nabr Great idea to PL these shaders into the library. I've added the binary glitch as example:

  BinaryGlitchPass

  binaryGlitchFrag.glsl

  I've taken a look over the shaders you converted and it seems that you have a lot of unused variables declared. And as @nabr already mentioned, it is necessary to run the shaders with GLSL v120, because of compatibility.
• georgehenryrowe

  February 2018

  @kfrajer no worries, thought I should share rather than just being a lurker.

  @nabr thanks for the info, I didn't know either of those things. I'm pretty new to GLSL - what I was using these for did use 3D shapes, but I'll try on 2d and see if I get a performance increase.

  @cansik Yeah I was being lazy and copy-pasting a chunk which covered all the variables used in the most complex examples as I was part way through delivering something :) Will tidy them up.

  Thanks for the feedback y'all.
• BGADII

  April 2018 edited April 2018

  Great work. Would be great to see examples of the shaders being used on a gif hosting website like gyfcat, or even some example sketches. Also, do you know any resources for how to learn how to port shaders?