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Just rely on til_init()'s srand() ensuring things are fresh.
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Now modules allocate and return an opaque setup pointer in
res_setup when they implement a setup method.
Defaults are utilized when ${module}_create_context() receives a
NULL setup. The default setup used in this case should match the
defaults/preferred values emitted by the module's setup method.
But performing setup should always be optional, so a NULL setup
provided to create_context() is to be expected.
No cleanup of these setup instances is currently performed, so
it's a small memory leak for now. Since these are opaque and may
contain nested references to other allocations, simply using
free() somewhere in the frontend is insufficient. There will
probably need to be something like a til_module_t.setup_free()
method added in the future which modules may assign libc's free()
to when appropriate, or their own more elaborate version.
Lifecycle for the settings is very simple; the setup method
returns an instance, the caller is expected to free it when no
longer needed (once free is implemented). The create_context
consumer of a given setup must make its own copy of the settings
if necessary, and may not keep a reference - it must assume the
setup will be freed immediately after create_context() returns.
This enables the ability to reuse a setup instance across
multiple create_context() calls if desired, one can imagine
something like running the same module with the same settings
multiple times across multiple displays for instance. If the
module has significant entropy the output will differ despite
being configured identically...
With this commit one may change settings for any of the modules
*while* the modules are actively rendering a given context, and
the settings should *not* be visible. They should only affect
the context they're supplied to.
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This is a preparatory commit for cleaning up the existing sloppy
global-ish application of settings during the iterative _setup()
call sequences.
Due to how this has evolved from a very rudimentary thing
enjoying many assumptions about there ever only being a single
module instance being configured by the settings, there's a lot
of weirdness and inconsistency surrounding module setup WRT
changes being applied instantaneously to /all/ existing and
future context's renderings of a given module vs. requiring a new
context be created to realize changes.
This commit doesn't actually change any of that, but puts the
plumbing in place for the setup methods to allocate and
initialize a private struct encapsulating the parsed and
validated setup once the settings are complete. This opaque
setup pointer will then be provided to the associated
create_context() method as the setup pointer. Then the created
context can configure itself using the provided setup when
non-NULL, or simply use defaults when NULL.
A future commit will update the setup methods to allocate and
populate their respective setup structs, adding the structs as
needed, as well as updating their create_context() methods to
utilize those setups.
One consequence of these changes when fully realized will be that
every setting change will require a new context be created from
the changed settings for the change to be realized.
For settings appropriately manipulated at runtime the concept of
knobs was introduced but never finished. That will have to be
finished in the future to enable more immediate/interactive
changing of settings-like values appropriate for interactive
manipulation
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Just mechanical replacement of some remaining ad-hoc
til_module_t.create_context() calls.
The montage module continues using an ad-hoc call because it
forces num_cpus=1 since it's already a threaded using a fragment
per module's tile. This suggests the til_module_create_context()
call should probably accept a num_cpus parameter, perhaps
treating a 0 value as the "automagic" discover value so callers
can explicitly set it when necessary.
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Introduce drawing styles, adding a line style in addition to the
existing points.
Settings are style={points,lines}, default is now lines.
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No idea why this was in there. Though it makes the leader jump
by huge values, since it still winds up as samples on the same
path, just non-continuous, the swarm still appears correct,
hiding this braino.
If you reduce the SWARM_SIZE to a tiny number like 2 though, it
becomes very obvious that the leader is teleporting all over the
place.
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This resulted in a NULL ptr deref, simply treating as invalid
since what's the point of handling a composition devoid of any
layers - it's probably a mistake.
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attempt at making these more clear
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Now that til_setting_t.desc is not only a thing, but a thing that
is intended to be refreshed regularly in the course of things
like GUI interactive settings construction, it's not really
appropriate to try even act like this these are const anymore.
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Mechanically replaced ad-hoc til_module_t.destroy_context()
invocations with helper calls.
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Always only capitalize the first letter, never capitalize like
titles.
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Originally the thinking was that rototiller modules would become
dlopen()ed shared objects, and that it would make sense to let
them be licensed differently.
At this time only some modules I have written were gplv3, Phil's
modules are all gplv2, and I'm not inclined to pivot towards a
dlopen model.
So this commit drops the license field from til_module_t,
relicenses my v3 code to v2, and adds a gplv2 LICENSE file to the
source root dir. As of now rototiller+libtil and all its modules
are simply gplv2, and anything linking in libtil must use a gplv2
compatible license - the expectation is that you just use gplv2.
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The existing iterative *_setup() interface only described
settings not found, quietly accepting usable settings already
present in the til_settings_t.
This worked fine for the existing interactive text setup thing,
but it's especially problematic for providing a GUI setup
frontend.
This commit makes it so the *_setup() methods always describe
undescribed settings they recognize, leaving the setup frontend
loop calling into the *_setup() methods to both apply the
description validation if wanted and actually tie the description
to respective setting returned by the _setup() methods as being
related to the returned description.
A new helper called til_settings_get_and_describe_value() has
been introduced primarily for use of module setup methods to
simplify this nonsense, replacing the til_settings_get_value()
calls and surrounding logic, but retaining the til_setting_desc_t
definitions largely verbatim.
This also results in discarding of some ad-hoc
til_setting_desc_check() calls, now that there's a centralized
place where settings become "described" (setup_interactively in
the case of rototiller).
Now a GUI frontend (like glimmer) would just provide its own
setup_interactively() equivalent for constructing its widgets for
a given *_setup() method's chain of returned descs. Whereas in
the past this wasn't really feasible unless there was never going
to be pre-supplied settings.
I suspect the til_setting_desc_check() integration into
setup_interactively() needs more work, but I think this is good
enough for now and I'm out of spare time for the moment.
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The existing simulation would always accumulate, eventually
filling the volume with density.
This adds a decay to diminish the density, with the default less
quickly filling the volume vs. before.
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These are making it into the settings strings, it's benign only
because regexps aren't currently being enforced. Fix it up
anyways.
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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 manifests in the current unconfigured rtv glimmer shows, since
the default is a the "none" module when no settings are applied.
But it turns out this isn't just a glimmer problem, "none" is advertised
in the settings as a blanking alternative to snow. So it's actually
broken in rototiller as well.
This fixes it by detecting the nil "none" module's lack of any
prepare_frame or render_fragment methods, and open coding the blanker
with a fb_fragment_zero() inline.
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This is a first approximation of separating the core modules and
threaded rendering from the cli-centric rototiller program and
its sdl+drm video backends.
Unfortunately this seemed to require switching over to libtool
archives (.la) to permit consolidating the per-lib and
per-module .a files into the librototiller.a and linking just
with librototiller.a to depend on the aggregate of
libs+modules+librototiller-glue in a simple fashion.
If an alternative to .la comes up I will switch over to it,
using libtool really slows down the build process.
Those are implementation/build system details though. What's
important in these changes is establishing something resembling a
librototiller API boundary, enabling creating alternative
frontends which vendor this tree as a submodule and link just to
librototiller.{la,a} for all the modules+threaded rendering of
them, while providing their own fb_ops_t for outputting into, and
their own settings applicators for driving the modules setup.
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These modules are meta modules, and the only place this
information is presented currently is in the rtv module captions
overlaying the visual output of unrelated modules.
So it's rather misleading to put the meta module's author and
license on-screen when what's being shown is arguably just a tiny
fraction of the meta module's contribution.
Rather than bother with constructing license and author lists at
runtime from the modules incorporated by these meta modules,
let's instead adopt a policy of meta modules omit any declaration
of license or authorship outside of the source. This is a simple
solution for now, it can be revisited later if necessary.
Changing the .author member of rototiller_module_t to an
.authors() function pointer wouldn't be difficult. But it does
open up something of a can of worms when considering recursive
dependencies and needing to construct unique authors and licenses
lists from things like nested meta modules. Obviously there
can't be infinite recursion as that would manifest in the
rendering path as well, but what I'm more concerned about is
properly handling potentialy quite long lists. It's already
annoying when rtv has to deal with a long settings string, which
I believe currently is just truncated. The same would have to be
done with long authors/licenses I guess.
In any case, I think it's probably fine to just leave authorship
and license ambiguous when a meta module is shown in rtv. It's
certainly preferable to vcaputo@pengaru.com getting credit for
everything shown in the three meta modules currently implemented,
or more specifically, the two shown in rtv; compose and montage.
Note this required making rtv tolerante of NULL .license and
.author rototiller_module_t members.
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Minor cosmetic consistency fixup
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Just a fun little swarm based loosely on 80s-era boids
It would be interesting to make stuff like the # of particles
and the weights runtime configurable, or exposed as knobs.
Using a Z-buffer for occlusions and perhaps shading by depth might
make a significant improvement on the visual quality. It might also
be interesting to draw the particles as lines connecting their current
position with their previous, instead as pixels. Or fat pixels like
stars...
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This is a quick and dirty jab at normalizing the plasma size to
be independent of the frame size.
I kind of hate this module as-is, it's tempting to discard all
the fixed point stuff and just redo it using floats.. the plasma
itself isn't that attractive as-is either.
But I have other things to work on currently, just wanted to make
it so the plasma doesn't look like a solid color in the montage
tile.
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- move LUT initialization to context create
- minor syntactic changes
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- switch puddle_sample() to 0..1 coordinates to avoid
some pointless extra arithmetic on every pixel
- avoid redundant ->w multiplies in puddle_sample()
- avoid multiplies in inner loops of drizzle_render_fragment()
by accumulating coordinates w/addition instead
I noticed full-screen 'compose' was struggling to keep a full
frame rate on my laptop when testing with the new 'plato' layer.
valgrind profiles showed drizzle as the big hog, mostly the
puddle_sample() function. These changes help but it's still not
great, getting much better will likely become invasive and
crufty. It would be nice to cache the vertical lerp results and
reuse them across puddle_sample() calls when valid, that might be
a useful TODO.
The runner-up is spiro, prolly some low-hanging fruit there as
well, I haven't looked yet.
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now: "drizzle:stars:spiro:plato"
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plato implements very simple software-rendered 3D models of
the five convex regular polyhedra / Platonic solids
Some TODO items:
- procedurally generate vertices at runtime
- add hidden surface removal setting (Z-buffer?)
- add flat shaded rendering setting
- add gouraud shading, maybe phong too?
- show dual polyhedra
This was more about slapping together a minimal 3D wireframe
software renderer than anything to do with polyhedra, convex
regular polyhedra just seemed like an excellent substrate since
they're so simple to model.
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In case some code path creates module contexts and renders without
applying settings, it's important to ensure there are defaults.
As-is this would have crashed compose because compose_layers would
have been NULL, and compose_create_context() assumed compose_layers
always contained something useful.
Montage would have been an example of this, though for other reasons
montage has had compose disabled so I don't think anything currently
would have triggered this.
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The threaded rendering backend isn't reentrant and compose could
hypothetically have montage as a layer triggering infinite
recursion.
For now use a big hammer and block compose module from montage.
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Once upon a time montage had to skip stars and pixbouce because
they crashed. That has since been corrected, but the commit which
removed the skips didn't remove the lookups.
This removes the leftover lookups.
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This module needs some love, but it already always supplies 1 to
the open-coded rendering for the tiles. It never should have been
supplying the real num_cpus to module.create_context(), then only
supplying 1 for rendering.
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--module=compose,layers=first:second:third:...
this draws the named modules in the order listed, overdrawing the
output of the previous layers in a cumulative fashion.
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This adds a bit flag for tracking if the fragment has been zeroed
since its last flip/present.
When a fresh frame comes back from flipping, its zeroed state is
reset to false.
When fb_fragment_zero() is called, it checks if zeroed is true,
and skips the zeroing if so.
If zeroed is false, fb_fragment_zero() will zero the fragment and
set the zeroed flag to 1.
This change is preparatory for layering the output of modules in
a compositing fashion. Not all modules are amenable to being
used as upper layers, since they inherently fill the screen with
new pixels every frame. Those modules make good bottom or bg
layers. Other modules perform fb_fragment_zero() every frame
and add relatively few pixels atop a clean slate. These modules
make good candidates for upper layers where this change becomes
relevant.
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This takes a module name or "none", to use the specified module or
do nothing during the channel switching snow_duration.
The default is "snow" like before.
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This renames rtv_channel_t to rtv_module_t and modules to
channels in various places, which arguably should have been in a
separate commit but I'm not up for separating that out at the
moment.
Fundamentally what's happening is every channel is getting its
own context which may persist across channel switches, this
allows watching a variety of channels in a stateful manner before
they get their contexts recreated with re-randomized settings.
For modules without settings it's not terribly interesting, and
I'm thinking modules should probably start deriving some of their
state more directly from the global ticks rather than their own
per-context counters and timers. That way even when their
contexts get recreated with re-randomized settings, there can be
some continuity for ticks-derived state. Deriving position for
instance mathematically from ticks would allow things to be
located continuously despite having their contexts and even
settings changed, which may be interesting.
Anyhow, if you want the previous behavior where contexts are
always recreated on channel switch, just set the value to be
contxt_duration equal to duration.
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Ticket is unnecessarily abstract/opaque of a name for this, it's
simply the sort order. No point making the reader grok whatever
model I was thinking when I wrote it at the time, i.e. tickets at
a butcher counter.
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time() only changes every second, so this had the effect of freezing
the seed a second at a time, affecting all rand() users, when spiro's
create_context() was called more frequently than 1HZ.
When using rtv with channels=spiro,duration=0 the create_context() gets
called every other frame, and the visual results were very broken with
the spiro only actually reseeding every second and the snow between each
frame being static since it too uses rand() for seeding itself.
This whole situation suggests no module should be calling srand(), and
instead rototiller should probably call srand() once at startup and any
modules that wish to use rand with a different seed should use rand_r(),
and maybe rand() just for acquiring the seed like modules/snow does.
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Purely cosmetic change renaming to
rtv_should_skip_module() since the function doesn't actually
skip anything, it just determines the skip.
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This adds a colon-separated channels setting, with a
setting of "all" for the existing all-modules behavior.
Colon was used since comma is already taken by the settings
separator, maybe in the future comma escaping can be added
everywhere relevant but for now just keep it simple.
The immediate value of this setting is telling rtv to limit
itself to a single module, and using its setting randomizer
to automatically observe a variety of the available settings
in action on a specific module, especially during development.
If knobs ever get added in the future I expect this will become
even more interesting for watching specific modules under their
various settings permutations in combination with their knobs
being twisted - especially if rtv reconstructs random signal
generator chains for the "knob-twisters" on every channel switch.
An immediately interesting TODO complementing this particular
change would be optionally preserving module contexts across
channel switches, so when the same module is revisited it resumes
where it was last seen. But this conflicts with settings changes
on channel switching, since contexts should probably always be
recreated when settings change - but that's probably a
module-specific detail that modules should just be robust enough
to tolerate as in they'd safely ignore settings changes without a
context recreate, or apply them if they safely can without a
context recreate... TODO.
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This adds three rtv settings:
duration, caption_duration, snow_duration
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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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These don't actually do anything yet
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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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My current version of mingw in debian 9.11 doesn't seem to have
rand_r(), so let's just use plain rand() and lose the improved
parallelization on win builds.
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Modulo ticks by 2*M_PI to preserve precision by constraining the float
to 2*M_PI radians.
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Most modules find themselves wanting some kind of "t" value increasing
with time or frames rendered. It's common for them to create and
maintain this variable locally, incrementing it with every frame
rendered.
It may be interesting to introduce a global notion of ticks since
rototiller started, and have all modules derive their "t" value from
this instead of having their own private versions of it.
In future modules and general innovations it seems likely that playing
with time, like jumping it forwards and backwards to achieve some
visual effects, will be desirable. This isn't applicable to all
modules, but for many their entire visible state is derived from their
"t" value, making them entirely reversible.
This commit doesn't change any modules functionally, it only adds the
plumbing to pull a ticks value down to the modules from the core.
A ticks offset has also been introduced in preparation for supporting
dynamic shifting of the ticks value, though no API is added for doing
so yet.
It also seems likely an API will be needed for disabling the
time-based ticks advancement, with functions for explicitly setting
its value. If modules are created for incorporating external
sequencers and music coordination, they will almost certainly need to
manage the ticks value explicitly. When a sequencer jumps
forwards/backwards in the creative process, the module glue
responsible will need to keep ticks synchronized with the
sequencer/editor tool.
Before any of this can happen, we need ticks as a first-class core
thing shared by all modules.
Future commits will have to modify existing modules to use the ticks
appropriately, replacing their bespoke variants.
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This commit adds some fun features to the starfield:
- normalize aspect ratio to fragment size
- rolling viewport
- rotating viewport (with rate option)
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The existing code conflated the rendered frame dimensions with
what's essentially the virtual camera's film dimensions. That
resulted in a viewing frustum depending on the rendered frame
dimensions. Smaller frames (like in the montage module) would
show a smaller viewport into the same scene.
Now the view into the scene always shows the same viewport in
terms of the frustum dimensions for a given combination of
focal_length and film_{width,height}.
The rendered frame is essentially a sampling of the 2D plane
(the virtual film) intersecting the frustum.
Nothing is done to try enforce a specific aspect ratio or any
such magic. The caller is expected to manage this for now, or
just ignore it and let the output be stretched when the aspect
ratio of the output doesn't match the virtual film's aspect
ratio.
In the future it might be interesting to support letter boxing or
such things for preserving the film's aspect ratio.
For now the ray module just lets things be stretched, with
hard-coded film dimensions of something approximately consistent
with the past viewport.
The ray module could make some effort to fit the hard-coded film
dimensions to the runtime aspect ratio for the frame to be
rendered, tweaking things as needed but generally preserving the
general hard-coded dimensions. Allowing the frustum to be
minimally adjusted to fit the circumstances... that might also be
worth shoving into libray. Something of a automatic fitting
mode for the camera.
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Using the new puddle lib throw some raindrops on the framebuffer
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Switch to working through the set of modules in a random order,
randomizing the order once per cycle.
This way no modules get starved for display, which was pretty common
in the old method.
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