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This moves the per-object _prepared state into ray_render_object_$type
structs with all the rendering-related object methods switched to
operate on the new render structs.
Since the current rendering code just makes all these assumptions
about light objects being point lights, I've just dropped all the
stuff associated with rendering light objects for now. I think it
will be refactored a bit later on when the rendering code stops
hard-coding the point light stuff.
These changes open up the possibility of constifying the scene and
constituent objects, now that rendering doesn't shove the prepared
state into the embedded _prepared object substructs.
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To enable prepare to precompute aspects of primary rays which all have a
common origin at the camera, bring the camera to ray_object*_prepare() and
bring the depth to ray_object*_intersects_ray() for primary ray detection.
This is only scaffolding, functionally unchanged.
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Just embed a _prepared struct in the object where precomputed stuff can be
cached. Gets called once before rendering, which ends up calling the
object-specific ray_object_$type_prepare() methods per object.
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Restoring some organizational sanity since adopting autotools.
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