Hyperandroid: Efficient WebGL stroking:

"While working on WebGL rendering you soon realize that a canvas like API, despite its opinionated implementation, is extremely useful and easy to work with. Concretely, I am referring to its stroking capabilities. While making a stroke WebGL implementation I came up with the following solution, which requires very simple maths, is fast, and can be implemented just from 2d vectors."

Fun stuff.