LE is up - hoping it'll be a good prototype for new features

[joevenzon]

Sure.

This is the way that lighting works in the deferred renderer: postprocess the gbuffer with a shader that accumulates the contribution from the light. Instead of postprocessing the entire screen, an optimization is to only postprocess the set of pixels that the light will affect. For a point light, we can roughly get the pixels affected by a light by rendering the backfaces of a bounding cube (we must render backfaces in case the camera is inside the cube).

This particular bit of code was a test that explicitly set up the bounding cube and its properties; eventually I'll make it so you can call a function to set up the point light with position, radius, and color.