Processing’s web reference only contains the very basic, although they could add more to it:
For the most complete Processing’s API see its JavaDocs:
https://Processing.GitHub.io/processing-javadocs/core/
There’s also the full source code on its repo:
GLSL is a completely different programming language targeting the GPU:
Processing merely allows us to embed GLSL code in our sketches:
JOptionPane class doesn’t belong to Processing’s API but Java’s standard library:
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