The new OpenGL renderers in Processing 2.0 (P2D/P3D) rely extensively on GLSL shaders. Although in most common situations the use of shaders is invisible to the user, Processing includes a new PShader class that allows to apply custom shaders to the drawing of the sketch. This post describes the shader architecture in Processing 2.0, and the common interfaces that custom GLSL shader code needs to include in order to be accepted by the OpenGL renderers in Processing.
Update: With the release of Processing 2.0 final, some of the contents in this post are outdated, please check this tutorial for a detailed description of the finalized shader API.
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