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Spherical harmonics face relighting using OpenCV, OpenGL [w/ code]

I’ve been working on implementing a face image relighting algorithm using spherical harmonics, one of the most elegant methods I’ve seen lately.
I start up by aligning a face model with OpenGL to automatically get the canonical face normals, which brushed up my knowledge of GLSL. Then I continue to estimating real faces “spharmonics”, and relighting.
Let’s start!

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A GLSL shader showing the normal map [w/ code]

A very simple thing, although I couldn’t find on Google some place to copy-paste off, so here it is: