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Previously every fb_fragment_t (and thus thread) was constructing
its own ray_camera_frame_t view into the scene, duplicating some
work.
Instead introduce ray_camera_fragment_t to encapsulate the truly
per-fragment state and make ray_scene_render_fragment() operate
on just this stuff with a reference to a shared
ray_camera_frame_t prepared once per-frame.
Some minor ray_camera.c cleanups sneak in as well (prefer multiply
instead of divide, whitespace cleanups...)
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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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Trivially removes a ray_3f_mult_scalar() from the hot path.
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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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Now that rototiller is generally threaded when a prepare_frame() method is
supplied, and modules/ray has been updated accordingly, discard the now
redundant ray-specific threading code and related stuff.
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Restoring some organizational sanity since adopting autotools.
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