taller de shaders, introducción a GLSL y PShader.
tested on Processing 2.2.1 / OSX.
####blurXy x,y Blur with ping-pong.
####Gradient some gradient examples...
####frameDifference.
####DrawingTest1, 2, 3
####NormalsToRgb
####DitherTest Ordered dithering aka Bayer matrix dithering. ported to PShader from http://devlog-martinsh.blogspot.com.ar/2011/03/glsl-dithering.html
####DistanceFn distance() function examples, combined with, step() and mod() functions. ref: https://www.opengl.org/sdk/docs/man/html/distance.xhtml
####StepFn Step(), smoothstep() and mix() functions examples. ref: https://www.opengl.org/sdk/docs/man/html/step.xhtml https://www.opengl.org/sdk/docs/man/html/smoothstep.xhtml https://www.opengl.org/sdk/docs/man/html/mix.xhtml
####Pixelate.