WebGL - introduction to attributes

In this episode, I give a brief introduction to GLSL attributes in WebGL.

Concepts:
* getAttribLocation
* vertexAttrib3f
* attribute vec4 aPosition;

Resources:
* https://github.com/davidwparker/programmingtil-webgl/tree/master/0014-intro-attributes
* http://www.html5rocks.com/en/tutorials/webgl/shaders/

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