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This module started out as a way to test a line drawing algorithm, but
ended up looking interesting enough to include as a module of it's own.
#ZephyrCommit #BirdwalkCommit
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This module cycles through a set of modules referred to as pages.
Settings include:
pages={list,of,modules}
rate=float page flipping rate
direction=float page flipping direction
taps are exposed for controlling rate and direction real-time,
with the addition of an explicit page index tap for overriding
the automatic flipping normally influenced by rate and direction.
Note that when using rkt with these taps, it immediately becomes
limiting that there's no ability to specify NaN as a track value
for temporarily relinquishing control of the page idx. It'd be
very useful to let the automatic flipping run the show at
whatever rate the rkt tracks specify, until the page idx was
asserted to a specific page, then holding it on that page until a
NaN row for the page track was encountered, restoring automatic
flipping. This needs to get added in both the Rocket library and
RocketEditor to be supported, as well as getting wired up to the
rkt integration.
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This is primarily intended for overlay use, but when not an
overlay uses a little builtin seed-derived tile as a fallback.
Currently the only settings are {x,y}=-1..1 for the direction
vector. Speed is currently fixed to 1, the vector is always
normalized.
Nothing terribly exciting.
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Rudimentary .IT file music playback via libplayit.
When seekable=on, the file is 100% pre-rendered at context
create, then simply copied into the audio queue @ render_audio.
When seekable=off, the file is mixed incrementally per-frame @
render_audio in max of bufsize=N_frames increments. The bufsize
here basically just determines the maximum time spent rendering
audio in a single go, and how much tolerance of frame delays due
to slow rendering there will be before dropouts occur.
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More preparatory work for adding an .IT file playback module
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f89689b unintentionally removed this for some reason. Just
noticed a build with warnings wasn't failing...
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Intended as a bootstrap for new module creation, particularly
aimed at new contributors. No module context, fragmenting, taps,
or settings are implemented, to keep things as simple as
possible.
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This just binds the simple libs/txt/txt.c stuff to a rendering
module, exposing the minimal options as settings.
It's handy for testing libs/txt/txt.c, and introduces a module
requiring free-form strings potentially including newlines be
handled properly as settings values. This latter aspect is
important for improving settings syntax, any improvements must
handle these more complicated scenarios and now there's a good
test case for exercising those nuances.
I suppose there might also be use in the creative process if you
want a text element but haven't got around to hacking up a
prettier module for it yet. Just use this one temporarily.
See commit for some remaining TODO items.
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This is kind of a particle system, where the particles are pushed
around through a 3D vector space treated as a flow field.
No physics are being simulated here, it's just treating the flow
field as direction vectors that are trilinearly interpolated when
sampled to produce a single direction vector. That direction
vector gets applied to particles near it.
To keep things interesting the flow field evolves by having two
distinct flow fields which the simulation progressively
alternates sampling from. For every frame, both flow fields are
sampled for every particle, but how much weight is given to the
influence of one vs. the other varies by a triangle wave over
time. When the weight is biased enough to one of the flow fields
near a peak/valley in the triangle wave, the other gets
re-populated while its influence is negligible, also
interpolating its new values with 25% influence from the active
field.
The current flow field population routine is completely random.
Yet there's a surprising amount of emergent order despite being
totally randomized direction vectors.
Currently supported settings include:
size= the width of the 3D flow field cube in direction vectors
(the number of vectors is size*size*size)
count= the number of particles/elements
speed= how far a particle is moved along the current sample's
direction vector
This was first implemented in 2017, but sat unfinished in a topic
branch for myriad reasons. Now that rototiller has much more
robust settings infrastructure, among other things, it seemed
worth finishing this up and merging.
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Playing with libs/sig in 2D, this isn't really an interesting
module by itself in terms of visual output. But it might have
utility as a diagnostic thing if libs/sig becomes a more used
thing.
At the very least, for now, it's useful for observing affects of
and iterating on libs/sig development. So I'm merging this, just
gated behind TIL_MODULE_EXPERIMENTAL so it's not in rtv rotation
or presented as something in the usual modules list.
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I'm not sure if this will stay long-term, but it seems not be
disrupting linux builds and with open_memstream all gone now
mingw is succeeding with this present.
It would really make sense to simply replace all rand_r() usage
with a libtil rand_r equivalent. That way it can guaranteen
consistent behavior across platforms...
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This should have been in there already
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drm_fb.c did this locally for asprintf() but since then rand_r
and open_memstream have entered the picture as well...
this hasn't been a problem on gnu/linux builds but let's just
globally go _GNU_SOURCE for now. In mingw land I suspect
open_memstream in particular is going to be a PITA and require
replacement, judging from search results anyways
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this is very early/unfinished, hence experimental flag
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Finishes build/fs part of modules/rocket->modules/rkt rename
started in previous commit.
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This just stubs out a rocket meta module that renders with
another module.
Future commits will integrate GNU Rocket here.
When recursive settings formally lands you'll be able to nest as
much settings content as necessary for the underlying module
used, as part of the rocket settings. That should enable
describing stuff like complex compose scenarios for rocket to
sequence.
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Preparatory commit for experimenting with a GNU Rocket
integration for controlling the stream pipes on a timeline.
Since rocket doesn't support things like arbitrary strings, it's
not a natural fit for rototiller where the obvious thing would be
to describe scene compositions as settings strings as if you were
invoking rototiller.
But a temporary hack might be to just tell a rocket module
up-front all the scenes as settings strings you provide to its
setup. Those get assigned numeric identifiers, then rocket
tracks can control when they come on/off numerically. It just
requires describing all the scenes up front rather than in the
pattern editor which is less than ideal.
Being able to experiment with this half-ass solution may prove
useful anyways, and shouldn't be too much work.
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After reading about the Dreamachine[0], I wanted to experience
this phenomenon. The javascript-based web implementations
struggled to hold a steady 10Hz rate and would flicker like
crazy, so here we are.
Only setting right now is period=float_seconds, defaults to .1
for 10Hz.
One limitation in the current implementation is when the frame
rate can't keep up with the period the strobe will just stick on
without ever going off, because the period will always be
expired. There should probably be a setting to force turning off
for at least one frame when it can't keep up.
[0] https://en.wikipedia.org/wiki/Dreamachine
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This introduces a very naive unoptimized moire interference
pattern module, it's rather slow complete with a sqrtf() per
pixel per center.
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Mostly for compositing purposes, here will be a corpus of 2D
shapes, parameterized/procedurally generated and able to rotate
and perhaps have other dynamics added.
What shapes are there presently I had started implementing in
checkers as "styles", before realizing they really should just be
a separate module checkers can call into.
Not terribly interesting by itself, but as blinds and checkers
demonstrated, these things deliver a lot of value in
compositional situations. They're creating the palette to draw
from.
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This adds a voronoi diagram module, which when used as an overlay
produces a mosaic effect.
Some settings:
cells=N number of voronoi cells
randomize={on,off} randomizes the cell locations every frame
dirty={on,off} uses a faster sloppy/dithery-looking method
Some TODO items:
- use a more space efficient representation of the distance
buffer, maybe use uint16_t relative offsets into the cells
rather than pointers - capping their quantity to 64KiB
- anti-alias edges between cells
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This adds a checkers style overlay module, it's not terribly
interesting but may be made more useful if modules start
differentiating themselves as substantial vs. overlay effects.
It'd be nice if rtv/compose could automagically apply and
randomize overlay modules atop others, which would make use of
this type of thing as well as encourage more small modules like
these be written.
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This isn't super interesting but I might just start adding
simplistic overlay style modules for compositing/transition use.
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Now that there's a decoupled libtil usable by alternative
frontends by vendoring rototiller, the build should support
fb-less rototiller-less configurations.
In lieu of this change glimmer's build requires sdl2 despite not
actually utilizing sdl_fb. Now that shouldn't be necessary,
should there be neither libdrm or sdl2 present we'll only produce
libtil and no rototiller binary at all.
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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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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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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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--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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I'm pretty sure the remaining SDL2 API usage is fulfilled
by all SDL2 versions now that the SDL_CreateRGBSurfaceWithFormat()
call is gone.
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This adds a small framework of sorts for creating and composing signal
generators.
Two generators are implemented at this time; sig_ops_sin and sig_ops_mult
sig_ops_sin accepts a hz variable and will produce a sine wave of that
frequency.
sig_ops_mult accepts two sig_t generators and multiplies their outputs
Callers may construct their own sig_ops_t ops structs and supply them to
sig_new(), but it's expected that libs/sig will grow a collection of
commonly used generators which can then be used by simply passing their
sig_ops_$foo to sig_new().
See the test code at the bottom of libs/sig/sig.c for some contrived
sample usage. Note by composing multiple sig_ops_sin generators with
a sig_ops_mult generator, one can already easily construct a synth-like
LFO generator.
Some obvious todos are to add triangle/sawtooth/square wave generators.
More compositional generators may be interesting as well, like additive
and subtractive for example. Those will need to implement clipping, as
it's expected that the generators *always* stay within unity (0-1).
No modules use this yet, but I expect to wire this up to rtv for driving
knobs.
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Using the new puddle lib throw some raindrops on the framebuffer
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These were commonish in the 90s demo days, done as a library to encourage
use by different modules.
You can simply render this directly onto a frame buffer like the old days,
or sample it as a height map or density field for more complex compositions.
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This commit adds a module that emulates a spirograph
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This is somewhat unfinished as it uses the generic tiled fragmenter
that's not interested in appearances but prioritizes total coverage
and simplicity.
Montage should have its own tiler that can produce non-square and even
non-uniform tile dimensions, prioritizing filling the screen with
mostly-uniform tiles.
But that's a TODO item, this is good enough for now and exercises some
fragment details previously irrelevant and often ignored/broken in
modules.
The pixbounce module in particular seems completely broken with small
fragment sizes.
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This maps a different Z-slice through the noise field to each color
channel. The slices are moved up and down through the field over
time, and the size of the area each color samples is tweaked a bit
to make them less coherent with the noise field cells.
It could be improved, but I think the output is already neat enough
to be worth sharing.
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This is a 3D noise field addressed as a unit cube.
The caller supplies the resolution of the noise field in three
dimensions.
I've just pulled in my v3f.h here, but it probably makes sense to
later on move vector headers into libs/ and share them. Later.
It's called din as in noise, because it's shorter than perlin and
noise.
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This is as basic as it gets, the only fanciness is it recognizes
newlines and supports horizontal and vertical justification.
As this is intended to be run from potentially threaded fragmenter
renderers, it receives a fragment and *frame* coordinates for the
text to be rendered. If the text doesn't land in the given fragment,
nothing gets drawn.
Currently this is not optimized at all. There's a stubbed out rect
overlap test function which could be used to avoid entering the
text rendering loop for fragments with zero overlap, that's an obvious
low-hanging fruit optimization. After that, skipping characters
that don't overlap would be another obvious thing.
As-is the text render loop is always entered and the bounds-checked
put pixel helper is used. So every fragment will incur the cost of
rendering the full string, even when it's not visible.
For the rtv captions this isn't a particularly huge deal, but stuff
to improve upon in the future.
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The rtv module needs to show some captions, so I'm adding a minimal
bitmap ascii text renderer.
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I wanted to add some noise to the rtv module and figured why not
just add a snow module and make rtv pass through it briefly when
switching modules.
It's not interesting by itself, but as more composite/meta modules
like rtv get made it might be handy beyond rtv.
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This is sort of a meta renderer, as it simply renders other
modules in its prepare_frame() stage. They're still threaded
as the newly public rototiller_module_render() utilizes the
threading machinery, it just needs to be called from the serial
phase @ prepare_frame().
I'm pretty sure this module will leak memory every time it changes
modules, since the existing cleanup paths for the modules hasn't
needed to be thorough in the least. So that's something to fix
in a later commit, go through all the modules and make sure their
destroy_context() entrypoints actually cleans everything up.
See the source for some rtv-specific TODOs.
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This implements near verbatim the code found in the paper titled:
Real-Time Fluid Dynamics for Games
By Jos Stam
It sometimes has the filename GDC03.PDF, or Stam_fluids_GDC03.pdf
The density field is rendered using simple linear interpolation of
the samples, in a grayscale palette. No gamma correction is being
performed.
There are three configurable defines of interest:
VISCOSITY, DIFFUSION, and ROOT.
This module is only threaded in the drawing stage, so basically the
linear interpolation uses multiple cores. The simulation itself is
not threaded, the implementation from the paper made no such
considerations.
It would be nice to reimplement this in a threaded fashion with a
good generalized API, then move it into libs. Something where a unit
square can be sampled for interpolated densities would be nice.
Then extend it into 3 dimensions for volumetric effects...
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This module displays realtime battle for domination simulated
as 2D cellular automata.
This is just a test of the backend piece for a work-in-progress
multiplayer game idea. The visuals were kind of interesting to
watch so I figured may as well merge it as a module to share.
Enjoy!
PS: the results can vary a lot by tweaking the defines in submit.c
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Prep for adding a new module displaying a cellular automata
based on the grid component from a multiplayer game I'm working
on.
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This is the first step of breaking out all the core rendering stuffs
into reusable libraries and making modules purely compositional,
consumers of various included rendering/effects libraries.
Expect multiple modules leveraging libray for a variety of scenes and
such. Also expect compositions mixing the various libraries for more
interesting visuals.
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Fixes silly cosmetic error in configure output for checking libdrm...
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This is unoptimized, with a palette slapped together in vim, but still
pretty neat!
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