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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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Mechanical renaming of "zero" to "clear" throughout for this
context.
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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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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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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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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 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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