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Rename inv->neg, preparation for a new sig_ops_inv for inverting
0..1 to 1..0
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Included a little hack to defend against divide by zero, seems
reasonable given the intended use cases.
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This is a specialized version of sig_ops_scale which assumes a
min..max range of -1..+1
nvidia register combiners docs describe this operation as "expand
normal", and they have several variants, but I don't want to go
too crazy here right now. Plain expand it is.
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This assumes the input value is always 0-1, but may be used to produce
values in any signed range, mapped linearly to the input.
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aka negation
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The whole idea was to produce values 0-1, except of course
sig_ops_{mult,const} where one could deliberately get out of
these bounds.
Everything else should stay within 0-1 as it makes everything
much more composable.
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Supply two sig_t *'s: a, b
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Supply three sig_t *'s: value, min, max
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Added a simple test exercising pow and round
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The flexible array of void *'s would just align to a pointer,
which may not be safe for all members of whatever gets shoved in
here.
In an effort to make it more robust, make it an array of a junk
drawer union of types.
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Comment was vestigial from ops_mult.c which ops_lerp.c was derived
from.
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(Ab)uses rand_r by feeding ticks_ms as seedp for pseudo-random
numbers deterministically derived from ticks_ms.
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Make sig_ops_t.destroy functions consistently after init, no
functional changes.
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This takes three signals; a, b, and t
t controls the weight interpolating between a and b, they all key
off the same time ticks_ms.
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Now hz can vary with time as well...
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The simplest of signals: a constant value.
The immediate need for this is to convert ops_sin_ctxt_t.hz to
another sig_t enabling varying hz with time, while still being
able to have a fixed hz as well.
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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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This is intended for modules to expose bindings for floats affecting
rendering output that may be varied at runtime frame-to-frame.
See the comment in knobs.h for more information.
This commit only introduces the concept, no modules utilize it yet.
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Cosmetic change, put setup with the other function pointers.
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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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Missed this!
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Make naming consistent
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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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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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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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draw stars as circles that get larger as the approach the camera
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This commit adds a module that emulates a spirograph
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Ideally the number of modules can tile without leaving gaps, but
as rototiller evolves over time modules are added piecemeal so
try accomodate those awkward layouts.
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- fix bug for square fragments
- use create and destroy context hooks instead of globals
- refactor to allow fragment resizing
- handle extremely small fragments gracefully
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- use a context not globals
- use floats and a "unit cube" to simulate the starfield
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Since 7a77cc1a landed this is no longer true, the .random member
will be used to support randomizing non multiple-choice settings.
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Phil reported a crash in swab, illuminating an overflow in how the unit
cube was being scaled to the noise field dimensions.
Added some asserts enforcing critical assumptions as well, though it
will probably cost some FPS in din-heavy modules like swab.
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While the montage doesn't deeply thread the per-tile/module rendering,
the per-frame rendering is threaded with a work unit granularity of
every module's tile.
Meaning every module renders its tile in a single thread, but the
tiles are all rendered in parallel.
For the most part this works, and will only work better as more modules
are added to rototiller increasing the granularity. In the mean time
it's a bit coarse and some modules can be a lot more costly to render
than others, and there can be a shortage of modules to schedule on idle
CPUs.
It would be an interesting task to try make each module's tile get
subfragmented elastically. I didn't make any attempt to do that, but
it might even be worthwhile on hidpi screens where even those small
tiles may have a whole lot of pixels, especially on manycore CPUs.
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I'd like the output to fill the range -1..+1, but it's not doing that and I'm
uncertain on what exactly the scaling factor should be here.
In one reference a factor of 1/sqrt(.75) is specified, but in my tests that
doesn't seem to quite fill the range but it doesn't seem to blow it out so
it seems safe for now.
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This requires a forward declaration of v3f_t and changing din()
to take a v3f_t *.
The swab module needed updating to supply a pointer type and a
v3f_t definition.
This is being done so din.h users can have their own v3f
implementations. I might consolidate all the duplicated vector
code scattered throughout the libs and modules, but for now I'm
carrying on with the original intention of having modules be
largely self-contained. Though the introduction of libs like
ray and din has certainly violated that a bit already.
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This TODO is very stale and needs to be revisited.
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Since snow_context_t needs another member anyways, stick n_cpus in there
to inform the fragmenter of precisely how many fragments to make.
This renderer doesn't benefit from tiling or any such locality, so it uses
the slice fragmenter and really only benefits from as many fragments as there
are CPUs. Any additional fragments is just wasted fragmenting overhead.
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Snow was already threaded, but used a global seed with rand_r() meaning
the CPUs were hammering on the same address. There wasn't any locking or
atomics, as it isn't terribly critical when generating white noise if the
seed access is racy. But the writes still caused cache lines to ping-pong.
This commit gives a ~15.5% speedup in my measurements on an i7-2640M.
Note without the padded union, using just an array of ints, zero gain
is realized. I used a padding of 256 just to have some headroom, x86
is 64 but other CPUs vary, POWER9 is 128 for example.
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This repurposes the generic fb_fragment_tile_single() to better fit
the montage use case.
Partially covered areas are simply skipped, and tiles no longer need
to be square.
In determining the tile width and height, I'm just using the sqrt of
the number of modules and dividing the frame width and height. But
when the sqrt has a fraction, it's rounded up on the width divide
and rounded down on the height divide. So the width gets the extra
column of tiles, and the height just throws away the fraction.
I think it's OK for now, until someone gets a bug up their ass and
wants to avoid having vacant tiles in the bottom right corner when
the number of modules doesn't cooperate.
One problem with the just skipping partially covered areas is they
don't get zeroed out - no fragment is ever generated for them.
To fix that there will prolly have to be a fb_fragment_zero() of
the frame @ prepare :(. I guess it wouldn't be the end of the
world if the fragmenter itself zeroed out skipped regions. It's
kind of an ugly layering violation but this is a private montage-
specific fragmenter.
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