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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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Before I can clean up the ray_scene_t._prepared kludge I need a
place to keep state from frame prepare to render, enter context.
Future commits will migrate the _prepared stuff into a separate
ray_render_t which is constructed on prepare then acted on in
fragment render.
Then spatial acceleration structures may be added, constructed
at prepare phase and shared across the concurrent rendering.
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Remove some extraneous indentation
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Commit 445e94 switched to using sentinel objects, but missed removal
of these obsoleted object counts.
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There's no point computing more reflections if they're not going
to contribute substantially to the resulting sample. Previously
the max depth threshold solely controlled how many times a given
ray could reflect, this commit introduces a minimum relevance as
well. Value may require tuning, may actually make sense to move
into the scene description as a parameter.
Brings a minor frame rate improvement.
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Just cast buf to (void *) for the pointer arithmetic, stride is in
units of bytes and no assumptions should be made about its value
such as divisability by 4.
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Mechanical cosmetic change
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Rather than laying out all fragments in a frame up-front in
ray_module_t.prepare_frame(), return a fragment generator
(rototiller_fragmenter_t) which produces the numbered fragment
as needed.
This removes complexity from the serially-executed
prepare_frame() and allows the individual fragments to be
computed in parallel by the different threads. It also
eliminates the need for a fragments array in the
rototiller_frame_t, indeed rototiller_frame_t is eliminated
altogether.
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Trivial optimization eliminates some instructions from the hot path,
no need to maintain a separate index from the current object pointer.
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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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Currently fragments always start at the left edge of the frame, but
when switching to a tiling fragmenter this is no longer true and
causes visible errors.
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ray:object intersection coordinates were incorrectly being computed
relative to the ray origin using a subtraction instead of addition, a
silly mistake with surprisingly acceptable results. Those results
were a result of other minor complementary mistakes compensating to
produce reasonable looking results.
In the course of experimenting with an acceleration data structure it
became very apparent that 3d space traversal vectors were not behaving
as intended, leading to review and correction of this code.
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For now, a simple cpu multiplier of 64 is used.
fb_fragment_t needs a tiling fragment divider added...
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Small speedup, I personally find the code cleaner this way too.
Everything in the hot path should now be inlined, no function calls.
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We can just assume the object which reflected the ray being tracing
isn't going to be intersected. Maybe later this assumption no longer
holds true, but it is true for now.
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This gets rid of some computation on the primary ray:plane intersection tests
The branches on depth suck though... I'm leaning towards specialized primary
ray intersection test functions.
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This gets rid of some computation on the primary ray:plane intersection tests
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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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This may need to be undone in the future when more sophisticated lights,
like area lights, are implemented. For now I can avoid polluting the
objects list with the lights by strictly separating them.
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Remove unnecessary nearest_object check, the distance comparison alone
is sufficient when initialized to INFINITY.
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Just tidying up shade_ray() before more optimizations.
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Trivially removes a ray_3f_mult_scalar() from the hot path.
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We can avoid some unnecessary work at the max depth by checking it in
shade_ray() instead.
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This is functionally identical.
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This function isn't currently used, but its implementation was awful.
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Need to normalize the direction when we step the y axis and @ start.
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powf() is slow but precise, this isn't the fastest method but it's
at least portable and a bit faster.
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It's only necessary to normalize the direction stored vector in x_step(),
the rest can simply be linearly interpolated which saves some divides.
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Simple optimization taking advantage of the prepare, mults generally
are cheaper than divs.
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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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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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This moves most of the particle system maintenance into the serially
executed sparkler_prepare_frame(), divides the frame into ncpus
fragments, and leaves the draw to occur concurrently.
The drawing must still currently process all particles and simply skips
drawing those falling outside the fragment.
Moving more of the computation out of prepare_frame() and into
render_fragment() is left for future improvements, as it's a bit
complex to do gainfully.
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should_draw_expire_if_oob() assumed the fragment represented the entire
frame. Instead, return 0 if the coordinates are outside the fragment,
but only reset longevity if outside of the frame.
If sparkler goes threaded in the drawing, this would result in threads
simply skipping particles outside the fragment. The longevity reset
occurring in all threads appears suspicious but should be benign since
they all write the same thing - 0.
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The burst particle abused a zero mass to circumvent the effects of aging.
Instead use an explicit virtual flag to suppress aging, change busrt_cb
to ignore all virtual particles instead of only its center. Previously
burst_cb would thrust other bursts like any other particle, and this was
incorrect. Now burst centers are always stationary, even when they overlap
other bursts.
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introduces create_context() and destroy_context() methods, and adds a
'void *context' first parameter to the module methods.
If a module doesn't supply create_context() then NULL is simply passed
around as the context, so trivial modules can continue to only implement
render_fragment().
A subsequent commit will update the modules to encapsulate their global
state in module-specific contexts.
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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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The ray tracer was already threaded, so this required little change other
than making some state global like the previous commits, and calling the
underlying non-threaded single-fragment scene renderer function.
A future commit will discard the now vestigial ray_threads related code.
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Same basic changes as the previous commits made to julia and plasma.
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Same general procedure as the previous commit made to the julia module.
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Move maintenance of per-frame variables into julia_prepare_frame(), which
requires making them static file-scope globals for now.
Also make minor adjustments to the code to make less assumptions about the
fragment being rendered (like it's x/y coordinates being 0, etc.)
A future commit will probably add an initializer function to
rototiller_module_t, with an opaque pointer output which will be fed to all
the module methods so these globals can be encapsulated and instantiated.
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Modules need to know the overall dimensions of the frame the fragment
they're rendering is part of. Previously it wasn't really necessary
since the fragments supplied to the modules had always been the full
page, but that's changing.
This commit also changes the julia module to use the frame dimensions,
others will need updating as well.
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Adding more context to the name in anticipation of adding a prepare_frame()
method to the module struct.
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