https://github.com/erik-larsen/emscripten-sdl2-ogles2

https://github.com/erik-larsen/emscripten-sdl2-ogles2
Demonstrates the basics of porting desktop graphics to the web using Emscripten, via a collection of code samples. Code is written in C++, SDL2, and OpenGLES2 and transpiled into Javascript and WebGL by Emscripten.