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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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Also shortened the durations across the board, and defaulted snow
to "none".
With "compose" being another meta module, and the randomized
settings, this actually gives a more interesting grand tour of
everything possible.
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Just adds TIL_FB_DRAW_FLAG_TEXTURABLE so callers can granularly
inhibit texturing if desired.
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Idea here is to provide texture sources for obtaining pixel
colors at the til_fb_put_pixel/fill drawing API, making it
possible for at least overlayable modules to serve as
mask/stencil operators where their drawn areas are populated by
the contents of another fragment produced dynamically,
potentially by other modules altogether.
This commit adds a texture=modulename option to the compose
module for specifying if a texture should be used when
compositing, excepting and defaulting to "none" for disabling
texturing.
A future commit should expand this compose option to accept a
potential list of modules for composing the texture in the same
way as the main layers= list functions.
Something this all immediately makes clear is the need for
a better settings syntax, probably in the form of all module
setting specifiers optionally being followed by a squence
of settings, with support for escaping to handle nested
situations.
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Same as for roto and plasma...
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As with roto, it's important to differentiate plasma instances
when layered... plus it's kind of boring to always start plasma
identically.
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Just something quick and dirty to differentiate roto layers, plus
it's kind of boring having roto always start at the same state.
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It's no longer necessary to specify both snow_duration=0 AND
snow_module=none to disable snow, just specify snow_module=none.
A future commit should really make describing the "snow_duration"
setting contingent on snow_module != "none".
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Just one case, modules/submit, was using 32x32 tiles and is now
using 64x64. I don't expect it to make any difference.
While here I fixed up the num_cpus/n_cpus naming inconsistencies,
normalizing on n_cpus.
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Fragmenting is often dimensioned according to the number of cpus,
and by not supplying this to the fragmenter it was made rather
common for module contexts to plumb this themselves - in some
cases incorporating a context type/create/destroy rigamarole
for the n_cpus circuit alone.
So just plumb it in libtil, and the prepare_frame functions can
choose to ignore it if they have something more desirable onhand.
Future commits will remove a bunch of n_cpus from module contexts
in favor of this.
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The code was deliberately showing a single frame of snow when
snow_duration=0, since the durations are integral seconds ther
was no way to have a sub 1-second snow otherwise.
snow_module=none just means cleared for the snow_duration, not no
snow mechanism whatsoever. So the combination of 0 duration and
"none" was still flashing a single blank frame.
With this commit the combination of "none" and 0 snow_duration
prevents even a single frame of blank snow from being rendered.
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cosmetic indentation fixup
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Mechanical rename to something less ambiguous in a world with
til_settings_t, til_setting_t, and til_setup_t etc.
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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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compute scaled x/y coordinates less often by reusing them
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Quick FPS based comparisons shows this simple change gets a
nearly 10% FPS boost on this particular 4-core i7 laptop.
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Originally it seemed sensible to make these units of bytes, for
flexibility reasons.
But it's advantageous for everything to be able to assume pixels
are always 4-byte/32-bit aligned. Having the stride/pitch be in
bytes of units made it theoretically possible to produce
unaligned rows of pixels, which would break that assumption.
I don't think anything was ever actually producing such things,
and I've added some asserts to the {sdl,drm}_fb.c page
acquisition code to go fatal on such pages.
This change required going through all the modules and get rid of
their uint32_t vs. void* dances and other such 1-byte vs. 4-byte
scaling arithmetic.
Code is simpler now, and probably faster in some cases. And now
allows future work to just assume things cna always occur 4-bytes
at a time without concern for unaligned accesses.
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Without gamma correction the linear colors don't really pop, this
helps tremendously.
The gamma factor is hard-coded at 1.4 currently but may make
sense as a runtime setting.
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This is a first approximation at introducing colors to flui2d, the
emitter colors aren't really well tuned or anything yet.
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Inspired by my little fomo match-four game PoC, this is a similar
style phased emitter grid layout producing some neat turbulent
interactions.
Introduces an emitters={figure8,clockgrid} setting, and when
clockgrid is used, a clockstep=[.05-.99] for the radians step
made from one grid cell's emitter to the next where 1=2PI.
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During rtv runs we'd occasionally segfault in the unchecked line
drawing. This needs to be fixed, but for now just go slower.
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This adds count=N and orientation={horizontal,vertical} settings.
Which was precipitated by the introduction of a vertical blinds
mode.
e.g.:
--module=blinds,count=32,orientation=vertical
or for a quick tour of the possibilities:
--module=rtv,channels=blinds,duration=1,context_duration=1,snow_duration=0
weeeee
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It's getting crazy in here, this is fun:
--module=rtv,channels=compose,duration=1,snow_duration=0,context_duration=1
which will rejigger the commpose module w/randomized layers every second.
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In the interests of facilitating randomized automagic layered
compositing, tell the world when you're overlay-appropriate.
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This should plug a bulk of the setup leaks. Some of the
free_funcs still need to be changed to bespoke ones in modules
that allocate nested things in their respective setup, so those
are still leaking the nested things which are usually just a
small strdup of some kind.
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This brings something resembling an actual type to the private
objects returrned in *res_setup. Internally libtil/rototiller
wants this to be a til_setup_t, and it's up to the private users
of what's returned in *res_setup to embed this appropriately and
either use container_of() or casting when simply embedded at the
start to go between til_setup_t and their private containing
struct.
Everywhere *res_setup was previously allocated using calloc() is
now using til_setup_new() with a free_func, which til_setup_new()
will initialize appropriately. There's still some remaining work
to do with the supplied free_func in some modules, where free()
isn't quite appropriate.
Setup freeing isn't actually being performed yet, but this sets
the foundation for that to happen in a subsequent commit that
cleans up the setup leaks.
Many modules use a static default setup for when no setup has
been provided. In those cases, the free_func would be NULL,
which til_setup_new() refuses to do. When setup freeing actually
starts happening, it'll simply skip freeing when
til_setup_t.free_func is NULL.
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Randomize the setting of the layered modules like rtv does.
This needs to free the setup, similarly to the others, once
that facility is added.
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Instead of always showing defaults, randomize the setup like rtv
does.
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This makes the arg return optional by using a res_arg pointer,
instead returning -ENOMEM when it would have returned NULL on
allocation failures.
This also makes it possible to detect when no setup was
performed, by returning 0 in such a case. Now returns 1 when
setup occurs and res pointers populated.
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This commit pulls the setup randomizer out of rtv into libtil
proper, so other modules may make use of it.
Other than adding an assert no functional changes occurred.
It may make sense to split this into two functions; one which
takes a til_module_t as-is, and a lower-level bare setup function
callback based function that doesn't know about til_module_t the
former would call into. That way generic setup randomization can
occur (the same setup machinery is used in video contexts for
example) without necessarily having a til_module_t on hand.
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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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There's been a longstanding todo item in montage where it was
ignoring the fragmenter returned by a module's prepare_frame().
This commit continues with the single-threaded rendering of the
modules within their respective tiles, still ad-hoc open coded.
But now actually applies the fragmenter returned as if the
rendering were being threaded, since when a module returns a
fragmenter from its prepare_frame() it may strongly depend on
that fragmenting for its output.
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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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Mechanical renaming of "zero" to "clear" throughout for this
context.
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