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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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This introduces ray_render_t, and ray_render.[ch].
The _prepared member of ray_scene_t has been moved to ray_render_t,
and the other _prepared members (e.g. objects) will follow.
Up until now I've just been sticking the precomputed state under
_prepared members of their associated structures, and simply using
convention to enforce anything resembling an api boundary. It's
been convenient without being inefficient, but I'd like to move
the ray code into more of a reusable library and this wart needs
to be addressed.
The render state is also where any spatial indexes will be built
and maintained, another thing I've been experimenting with.
Note most of the churn here is just renaming ray_scene.c to
ray_render.c. A nearly global s/ray_scene/ray_render/ has occurred,
now that ray_scene_t really only serves as glue to bind objects,
lights, and scene-global properties into a cohesive unit.
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Prior to rototiller_module_t these headers were included
and the module-specific render functions called directly.
That's no longer the case, these files are irrelevant today.
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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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Originally I only implemented pitch->yaw->roll, and being new to all this
didn't fully appreciate the limitation that resulted in.
This adds all six permutations of pitch/yaw/roll, the scene must specify
the desired order when setting up the camera with the euler angles, see
the enum in ray_euler.h.
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The relative path broke out-of-tree builds.
Previously the following:
$ mkdir /tmp/foo
$ cd /tmp/foo
$ ~/src/rototiller/configure
$ make
Would fail to compile unable to locate the headers in
~/rototiller/src
This fixes it.
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Restoring some organizational sanity since adopting autotools.
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