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It's just simple function calls, minimal boilerplate and simple API.

You can write shaders (not mandatory since it supports 3D without them) but loading them is simple as using ShaderToy.

https://processing.org/tutorials/pshader/

No, you can do a lot of stuff in processing with the 2D primitives. You can use shaders if you want, but it's not something typically done as an introduction.

well, we were middle schoolers being introduced to programming through video games. we were making basic 2d games like asteroids and tankwar, nothing with shaders.