An article giving an interactive introduction to derivative functions in common shading languages. By Giuseppe Portelli.

An article explaining how OpenGL's APIs for vertex data have evolved over time.

Introduction to GPU programming with OpenGL

Introduction to GPU programming with OpenGL

Introduction to GPU programming with OpenGL

Two OpenGL tutorial videos that give an overview of the basics of setting up single-channel SDF font rendering. Video one covers basic bitmap text rendering, and video two shows how to convert from bitmap to SDF. Video one: https://www.youtube.com/watch?v=mnIQEQoHHCU Video two: https://www.youtube.com/watch?v=d8cfgcJR9Tk

User friendly OpenGL documentation site.