PUBLIC MARKS from sbrothier with tags html5 & WebGL

If you've read some of my other articles on this blog you probably know I'm a fan of HTML5. With HTML5 we get all this interesting functionality, directly in the browser, in a way that, eventually, is standard across browsers. One of the new HTML5 APIs that is slowly moving through the standardization process is the Web Audio API. With this API, currently only supported in Chrome and as of October 2013 also in Firefox, we get access to all kinds of interesting audio components you can use to create, modify and visualize sounds (such as the following spectrogram).

ThreeAudio helps you create music visualizations in Three.js, by exposing audio data in GLSL shaders. It can be used directly with Three.js or as a tQuery plug-in.

I recently started playing with shaders in three.js and I wanted to share some of what I’ve discovered so far. Shaders are the ‘secret sauce’ of modern graphics programming and understanding them gives you a lot of extra graphical fire-power. For me the big obstacle to learning shaders was the lack of documentation or simple examples, so hopefully this post will be useful to others starting out. This post will focus on using pixel shaders to add post-processing effects to Three.js scenes. This post assumes you already know the basics of using Three.js.