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These modules have been doing their work in prepare_frame(), but
aren't actually threaded modules and don't return a frame plan
from prepare_frame() nor do they provide a render_fragment() to
complement the prepare_frame().
The convention thus far has been that single-threaded modules
just provide a render_fragment and by not providing a
prepare_frame they will be executed serially.
These two modules break the contract in a sense by using
prepare_frame() without following up with render_fragment().
I'm not sure why it happened that way, maybe at one time
prepare_frame() had access to some things that render_fragment()
didn't.
In any case, just make these use render_fragment() like any other
simple non-threaded module would.
This was actually causing a crash when n_cpus=1 because
module_render_fragment() was assuming the prepare_frame() branch
would include a render_fragment(). It should probably be
asserting as such.
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Wire up seed via til_module_context.seed in the obvious manner,
minimal change to the code, no functional difference besides
giving pixbounces instances an isolated random seed state.
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Normalized all the randomizers to use til_module_context.seed
while in here.
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wired up to til_module_context.seed
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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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More obvious migrations to using the supplied seed
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also update call sites in modules/{meta2d,swab} accordingly
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More plumbing seed to rand in the obvious way...
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Just plumbing seed down in the obvoius manner, this could
probably be cleaned up a bit in the future.
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Due to how the values get matched as strings this extraneous 0
was interfering with FLUI2D_DEFAULT_CLOCKSTEP actually matching
anything.
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just fixing up some vestigial rand() invocations to use the seed
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til_setting_desc_t.random() and til_module_randomize_setup() now
take seeds.
Note they are not taking a pointer to a shared seed, but instead
receive the seed by value.
If a caller wishes the seed to evolve on every invocation into
these functions, it should simply insert a rand_r(&seed) in
producing the supplied seed value.
Within a given randomizer, the seed evolves when appropriate.
But isolating the effects by default seems appropriate, so
callers can easily have determinism within their respective scope
regardless of how much nested random use occurs.
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Once upon a time this thing asserted the pinned chunks were
empty, and that code is still sitting there commented out. But
when it was commented out ages ago, to enable bulk freeing of
chunkers without requiring unrefs of every allocation as an
optimization, no code was added to free the pinned chunks.
It's been easily ignored all this time since nobody really runs
rototiller long enough to notice, but that's becoming less true
now with how interesting something like:
--module=rtv,layers=compose,duration=1,context_duration=1,snow_module=none
is becoming...
There are other leaks still, largely surrounding settings, but
they are quite small. Eventually those will get tidied up as
well.
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this introduces a color= setting syntax:
color=#rrggbb
color=0xrrggbb
color=rrggbb
where rrggbb is case-insensitive html-style hexadecimal
also introduces a fill= setting:
fill=color
fill=sampled
fill=textured
fill=random
fill=mixed
sampled draws the color from the incoming fragment when layered,
textured draws the pixels from the texture when available,
random randomizes the choice from color,sampled,textured.
mixed isn't implemented fully and is just aliased to random
currently. The thinking for mixed is to allow specifying
proportions for color,sampled,textured which would then be
applied as weights when randomizing the selection from the three
at every filled checker.
the current implementation is just calling rand() when
randomized, but should really be like the other dynamics in
checkers with rate control and hash-based.
and introduces a fill_module= setting:
this is a first stab at employing other modules for filling the
filled cells.
Note since checkers is already a threaded module, the fill module
context gets created per-cpu but with an n_cpus=1.
This is kind of the first time module contexts are being rendered
manifold for the same frame, and that's illuminating some
shortcomings which needed to be dealt with. Some modules
automatically advance a phase/T value on every render which gets
persisted in their context struct. With how checkers is using
contexts, it's desirable for multiple renders of the same context
using the same ticks to produce the same output. So modules need
to be more careful about time and determine "dt" (delta-time)
values, and animate proportional to ticks elapsed. When ticks
doesn't change between renders, dt is zero, and nothing should
change.
For now this is using a hard-coded list of modules to choose
from, you specify the module by name or "none" for no
fill_module (solid checker fill). ex: "fill_module=shapes"
There's a need for something like fragment color and flag
overrides to allow til_module_render() to be treated as more of a
brush where the caller gets to specify what colors to use, or if
texturing should be allowed. For now, when fill_module=$module
is employed, the color determination stuff within checkers
doesn't get applied. That will need to be fixed in the future.
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modules/checkers w/fill_module=$module requires a consistent
mapping of cpu to fragnum since it creates a per-cpu
til_module_context_t for the fill_module.
The existing implementation for threaded rendering maximizes
performance by letting *any* scheduled to run thread advance
fragnum atomically and render the acquired fragnum
indiscriminately. A side effect of this is any given frame, even
rendered by the same module, will have a random mapping of
cpus/threads to fragnums.
With this change, the simple til_module_t.prepare_frame() API of
returning a bare fragmenter function is changed to instead return
a "frame plan" in til_frame_plan_t. Right now til_frame_plan_t
just contains the same fragmenter as before, but also has a
.cpu_affinity member for setting if the frame requires a stable
relationship of cpu/thread to fragnum.
Setting .cpu_affinity should be avoided if unnecessary, and that
is the default if you don't mention .cpu_affinity at all when
initializing the plan in the ergonomic manner w/designated
initializers. This is because the way .cpu_affinity is
implemented will leave threads spinning while they poll for
*their* next fragnum using atomic intrinsics. There's probably
some room for improvement here, but this is good enough for now
to get things working and correct.
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The palette mutates across frames, on a context-specific
schedule. Meaning the palette is per-context, so move it into
roto_context_t.
The phase also needs to be driven by ticks. And when ticks
doesn't change in cases where the same context is rendered
manifold in the same frame, the phase shouldn't move.
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This way if a given context gets rendered repeatedly for the same
tick, no movement occurs, until ticks changes.
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Also wire this up to the til_module_context_new() helper and
all its callers.
This is in preparation for modules doing more correct delta-T
derived animation.
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While testing an experimental checkers w/fill_module=blinds with
ASAN it became clear this module is making flawed assumptions
about fragment->frame_{width,height} and fragment->{width,height}
being equal.
When used by checkers for filling cells, there are situations
where the edge cell fragments need to describe a frame slightly
larger than the drawn area, because the cell size doesn't align
perfectly to the overall window/screen dimensions. So in these
cases the synthesized frame will still be a full cell's
dimensions while the width,height serve to clip within that area.
If modules aren't properly clipping their rendering, instead just
using frame_{width,height}, then they will have to use the
_checked() variants to ensure clipping occurs properly on a
per-pixel (slower) basis.
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Contexts aren't void* anymore, and free the contexts array too on
failure.
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This initializer could perform an out-of-bounds read since it
occurs before the n_modules bounds check.
Since the variable isn't even being used anymore just get rid of
this. Also found via ASAN.
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While testing a checkers change that fills cells using other
modules, ASAN kept tripping on pixbounce:
==147817==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x7fc78a31c10c at pc 0x55b30cd406e2 bp 0x7fc790afd0d0 sp 0x7fc790afd0c8
WRITE of size 4 at 0x7fc78a31c10c thread T2
#0 0x55b30cd406e1 in til_fb_fragment_put_pixel_unchecked pixbounce.c
#1 0x55b30cd3f8ae in pixbounce_render_fragment pixbounce.c
#2 0x55b30cd1dffb in module_render_fragment til.c
#3 0x55b30cd1d989 in til_module_render (/home/foo/src/rototiller/build/src/rototiller+0x134989)
#4 0x55b30cd22534 in checkers_render_fragment checkers.c
#5 0x55b30cd14681 in thread_func til_threads.c
#6 0x7fc792b3d5c1 in start_thread pthread_create.c
#7 0x7fc792bc2583 in __clone (/usr/lib/libc.so.6+0x112583)
0x7fc78a31c10c is located 2276 bytes to the right of 1228840-byte region [0x7fc78a1ef800,0x7fc78a31b828)
allocated by thread T0 here:
#0 0x55b30cccf219 in __interceptor_malloc (/home/foo/src/rototiller/build/src/rototiller+0xe6219)
#1 0x7fc792d0e528 (/usr/lib/libSDL2-2.0.so.0+0x39528)
Thread T2 created by T0 here:
#0 0x55b30cc3cfa8 in pthread_create (/home/foo/src/rototiller/build/src/rototiller+0x53fa8)
#1 0x55b30cd13fff in til_threads_create (/home/foo/src/rototiller/build/src/rototiller+0x12afff)
#2 0x55b30cd1d573 in til_init (/home/foo/src/rototiller/build/src/rototiller+0x134573)
#3 0x55b30cd08f6c in main (/home/foo/src/rototiller/build/src/rototiller+0x11ff6c)
#4 0x7fc792add30f in __libc_start_call_main libc-start.c
SUMMARY: AddressSanitizer: heap-buffer-overflow pixbounce.c in til_fb_fragment_put_pixel_unchecked
Shadow bytes around the buggy address:
0x0ff97145b7d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ff97145b7e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ff97145b7f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ff97145b800: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ff97145b810: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0ff97145b820: fa[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ff97145b830: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ff97145b840: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ff97145b850: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ff97145b860: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0ff97145b870: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==147817==ABORTING
---
Rather than spend time digging into pixbounce's arithmetic, just
using the checked variant for now.
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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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- modules now allocate their contexts using
til_module_context_new() instead of [cm]alloc().
- modules simply embed til_module_context_t at the start of their
respective private context structs, if they do anything with
contexts
- modules that do nothing with contexts (lack a create_context()
method), will now *always* get a til_module_context_t supplied
to their other methods regardless of their create_context()
presence. So even if you don't have a create_context(), your
prepare_frame() and/or render_fragment() methods can still
access seed and n_cpus from within the til_module_context_t
passed in as context, *always*.
- modules that *do* have a create_context() method, implying they
have their own private context type, will have to cast the
til_module_context_t supplied to the other methods to their
private context type. By embedding the til_module_context_t at
the *start* of their private context struct, a simple cast is
all that's needed. If it's placed somewhere else, more
annoying container_of() style macros are needed - this is
strongly discouraged, just put it at the start of struct.
- til_module_create_context() now takes n_cpus, which may be set
to 0 for automatically assigning the number of threads in its
place. Any non-zero value is treated as an explicit n_cpus,
primarily intended for setting it to 1 for single-threaded
contexts necessary when embedded within an already-threaded
composite module.
- modules like montage which open-coded a single-threaded render
are now using the same til_module_render_fragment() as
everything else, since til_module_create_context() is accepting
n_cpus.
- til_module_create_context() now produces a real type, not void
*, that is til_module_context_t *. All the other module
context functions now operate on this type, and since
til_module_context_t.module tracks the module this context
relates to, those functions no longer require both the module
and context be passed in. This is especially helpful for
compositing modules which do a lot of module context creation
and destruction; the module handle is now only needed to create
the contexts. Everything else operating on that context only
needs the single context pointer, not module+context pairs,
which was unnecessarily annoying.
- if your module's context can be destroyed with a simple free(),
without any deeper knowledge or freeing of nested pointers, you
can now simply omit destroy_context() altogether. When
destroy_context() is missing, til_module_context_free() will
automatically use libc's free() on the pointer returned from
your create_context() (or on the pointer that was automatically
created if you omitted create_context() too, for the
bare til_module_context_t that got created on your behalf
anyways).
For the most part, these changes don't affect module creation.
In some ways this eases module creation by making it more
convenient access seed and n_cpus if you had no further
requirement for a context struct.
In other ways it's slightly annoying to have to do type-casts
when you're working with your own context type, since before it
was all void* and didn't require casts when assigning to your
typed context variables.
The elimination for requiring a destroy_context() method in
simple free() of private context scenarios removes some
boilerplate in simple cases.
I think it's a wash for module writers, or maybe a slight win for
the simple cases.
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I don't think rototiller is an appropriate place for being so
uncooperative, if someone gets the case wrong anywhere just make
it work. We should avoid making different things so subtly
different that case alone is the distinction anyways, so I don't
see this creating any future namespace collision problems.
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A bunch of these have just been done
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I didn't like the too fast spins where you can't even really get
a read on what's going on in the shape.
Suspect this will get tweaked more in the future...
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This is kind of experimental, not sure how I feel about it.
pinch=0..1 with a bunch of fractions, 0 disables it.
pinch_spin=-1..1 same as spin=
pinches=1..10 number of pinches, which come in pairs
This applies to all the current shapes, for a tour:
--module=rtv,channels=shapes,duration=2,context_duration=2,snow_module=none --defaults
I think the speeds might go to high atm, I kind of liked the
slower spins before all this more.
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woops
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scale=1-.5 with a few other fractions in between
Mostly added for the sake of rtv/compose where modules currently
always go full-frame, which can be really annoying sometimes for
shapes without any variety in the scale.
When checkers starts filling cells using modules like shapes,
it'll be interesting to see how this fares there since it'll
probably be randomizing the settings too. At least floored at
50% should still produce something legible in /most/ of the
checkers cell sizes. Definitely won't look like anything in the
smaller end of the checkers sizes though... hrm.
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Introduces spin={-1,0,1} with a few intermediate fractions on
both sides of 0. Controls rate and direction.
As-is these multiple choice style options don't let you
explicitly set a value in rototiller on the commandline that
isn't in the set.
There should probably be a flag in the desc we can set when
bypassing the available options is tolerable, probably when
regex's start getting enforced.
That way rototiller's commandline setting parsing can just lean
on the regex, and if the desc says anything can come in that
passes the regex even if it's not in the values set, this can all
still work and have something resembling input validation.
At the end of the day, the multiple choice value sets are
supposed to be a convenience/guide to a sane variety of values
and of particular utility to randomizers like used by
rtv/montage/compose, but also GUI setting selectors like in
glimmer.
They're not intended to get in the way preventing development
from accessing explicit values of arbitrary precision which can
be really necessary especially when trying to determine what's
best for going in the values set.
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Replace the hard-coded 5 points with a points=3-20 setting
Nothing fancy going on here
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- clear padding when {letter,pillar}boxed
- limit costly rendering to shape size area when boxed
- fix <= inclusion tests in circle and rhombus: s/<=/</
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I'm not sure why this was being done, it was probably just
vestigial from whatever I bootstrapped the compose module with
and never thought to remove it.
The first compose layer rendered will clear the frame if
necessary. By compose doing it ahead of time, it's performing
potentially unnecessary work clearing if the first layer is a
frame-filler style render where no clear is ever performed.
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This is a mostly mechanical change of using rand_r() in place of
rand(), using the provided seed as the seed state.
There's some outstanding rand()s outside of create_context()
which should probably get switched over, with the seed being
stowed in the context struct. I didn't bother going deeper on
this at the moment in the interests of getting to sleep soon.
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n_cells is a size_t, use %zu
clang complained, gcc doesn't, huh
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In the recent surge of ADD-style rtv+compose focused development,
a bunch of modules were changed to randomize initial states at
context_create() so they wouldn't be so repetitive.
But the way this was done in a way that made it impossible to
suppress the randomized initial state, which sometimes may be
desirable in compositions. Imagine for instance something like
the checkers module, rendering one module in the odd cells, and
another module into the even cells. Imagine if these modules are
actually the same, but if checkers used one seed for all the odd
cells and another seed for all the even cells. If the modules
used actually utilized the seed provided, checkers would be able
to differentiate the odd from even by seeding them differently
even when the modules are the same.
This commit is a step in that direction, but rototiller and all
the composite modules (rtv,compose,montage) are simply passing
rand() as the seeds. Also none of the modules have yet been
modified to actually make use of these seeds.
Subsequent commits will update modules to seed their
pseudo-randomized initial state from the seed value rather than
always calling things like rand() themselves.
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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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We don't actually want to produce indices 0-width and 0-height
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There's more to cleanup in rtv destruction, but this is the major
one.
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Found via -fsanitize=address, this is a quick and dirty way to
prevent the OOB access without adding more conditionals, just
prevent scaling the fragment dimensions to the full grid
dimensions.
This could be done better by reworking things a bit and putting
zero at the center of the grid with a -1..+1 mapping, so rounding
towards zero would land in the middle as opposed to off the
start, with the existing .5f offset.
But for now just fix the bug, nobody will notice the slight LCD
overscan-style difference of bilerp=on vs. off due to this way.
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This was causing the snow module to scribble via montage, since
snow uses per-cpu rand seeds indexed using the cpu value.
I didn't dig in to see if this was a vestigial thing where
fragnum once was passed as a parameter (it's also in
til_fb_fragment_t.number, but probably wasn't always that way).
But it's now used as a cpu idx, but since they're the same type
nothing complained, they say programming is hard.
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