It utilizes OpenGL and you can bind those objects to your own user defined physics with resources and actions, much like javascript binds to events.

you can see the WebGL shapes objects and components they have in the Kivy library, which is very nicely documented online.

OpenGl and Kivy are opensource so you should be able to make a wrapper module install, which would be similiar to an npm package in javascript, for Kivy, which would be a combination of Python and OpenGL if you wanted to create your own SDL components.