Pixel effects tutorials?

[adrix89]

Is there going to be a pixel effects tutorial or wiki when the bouncing Piggy rolls out?
If not does anybody have some resources I can look over?

[kraftman]

OpenGL Shader Language Course Chapter 2 (pdf) is worth a read for the basics of how GLSL works, then this explains some of the slight differences between pure GLSL and its Love implementation, how to send data to the shader, and a good example of a simple shader.
Finally, this thread has a few examples at the moment, and hopefully will have more and more as people write new ones.