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Having everything in fixed defines severely constrains the
diversity of particle behaviors and appearances.
This commit has been sitting around bitrotting since 2017, but
now that there's all this settings infra. and randomizing via
rtv, it seems worth landing, so I've rebased and am merging to
prevent a bitrot->rebase recurrence.
As-is, this commit ~minimally establishes a somewhat streamlined
parameterizing mechanism w/X-Macro patterns, while wiring up a
few of the obvious use cases surrounding xplode/burst, colorizing
the default sparkler explosions while at it.
It appears that when I first hacked this up I did some
experimentation with parameters as well, so there are some tweaks
to the behavior as opposed to a strict conversion of the fixed
defines to parameters. They seem minor enough to just leave be.
Plus a few minor optimizations like converting divides to
multiplies were in there.
Future commits can now wire up settings to choose from parameter
presets for different sparklers...
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This is a little contorted but not too bad. The input to
particles_new() is just a const conf struct, so instead of
passing in the seed value for particles_t to contain, a pointer
to where the seed lives is passed in via the conf. This requires
the caller to persist a seed somewhere outside the particles
instance, but at least in rototiller we already have that
conveniently in til_module_context_t.
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Just adds TIL_FB_DRAW_FLAG_TEXTURABLE so callers can granularly
inhibit texturing if desired.
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Largely mechanical rename of librototiller -> libtil, but
introducing a til_ prefix to all librototiller (now libtil)
functions and types where a rototiller prefix was absent.
This is just a step towards a more libized librototiller, and til
is just a nicer to type/read prefix than rototiller_.
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This commit adds a few settings for visualizing the octree BSP:
show_bsp_leafs (on/off):
Draw wireframe cubes around octree leaf nodes
show_bsp_leafs_min_depth (0,4,6,8,10):
Set minimum octree depth for leaf nodes displayed
show_bsp_matches (on/off):
Draw lines connecting BSP search matches
show_bsp_matches_affected_only (on/off):
Limit drawn BSP search matches to only matches actually
affected by the simulation
The code implementing this stuff is a bit crufty, fb_fragment_t
had to be pulled down to the sim ops for example and whether that
actually results in drawing occurring during the sim phase
depends on the config used and how the particle implementations
react to the config... it's just gross. This matters because the
caller used to know only the draw phase touched fb_fragment_t,
and because of that the fragment was zeroed after sim and before
draw in parallel. But now the caller needs to know if the config
would make sim do some drawing, and do the fragment zeroing
before sim instead, and skip the zero before draw to not lose
what sim drew. It's icky, but I'll leave it for now, at least
it's isolated to the sparkler.
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Just stubbed out for now, wanting to restore some octree overlays like
the old standalone sparkler had. Those can be wired up to settings so
rtv can occasionally show the spatial partition and matched particles.
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particles_free() didn't do all the necessary cleanup.
bsp_free() remains mostly unimplemented. I think this wasn't done at
the time because I was thinking bsp.c should use the chunker, then
cleanup is just a matter of freeing the chunker instead of traversing
the bsp.
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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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Restoring some organizational sanity since adopting autotools.
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