gl_ssao

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TSIA; Fixes #2

mp3guy

Projection scale wrong for perspective projection?

1

Currently, scale factor of the projection (used to compute radius to screen), is computed as [`float(height) / (tanf(projection.fov * 0.5f) * 2.0f);`](https://github.com/nvpro-samples/gl_ssao/blob/cb9ddbdd17ae197107b5be064a7168b984634e87/ssao.cpp#L738). `projection.fov` is `45`, so these are presumably degrees...

Erellu