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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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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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Mechanical change removing abbreviation for consistency
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Mostly mechanical change, though threads.c needed some jiggering to
make the logical cpu id available to the worker threads.
Now render_fragment() can easily addresss per-cpu data created by
create_context().
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Back in the day, there was no {create,destroy}_context(), so passing
num_cpus to just prepare_frame made sense. Modules then would
implicitly initialize themselves on the first prepare_frame() call
using a static initialized variable.
Since then things have been decomposed a bit for more sophisticated
(and cleaner) modules. It can be necessary to allocate per-cpu data
structures and the natural place to do that is @ create_context(). So
this commit wires that up.
A later commit will probably have to plumb a "current cpu" identifier
into the render_fragment() function. Because a per-cpu data structure
isn't particularly useful if you can't easily address it from within
your execution context.
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This removes the submit-softly module, instead using a runtime
setting to toggle bilinear interpolation on the submit module.
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Remove the silly kludge avoiding peripheral cells
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This substantially reworks the cell sampling in submit.
As a result, it's now threaded in the rendering phase which now
resembles a texture mapper sans transformations.
This produces a full-screen rendering rather than a potentially
smaller one when the resolution wasn't cleanly divisable by the grid
size.
A new module, named submit-softly has also been added to expose the
bilinearly interpolated variant. The transition between cells is also
employing a smoothstep so it's not actually linear.
The original non-interpolated version is retained as well, at the same
submit module name.
Some minor cleanups happened as well, nothing worth mentioning, except
perhaps that the cells are now a uint8_t which is fine unless someone
tries to redefine NUM_PLAYERS > 255.
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Just making things consistent, also dropping unnecessary player
assert from submit module. Future libs/grid may explore using
the "unassigned" zero player in taken calls for unassigning
cells like in simultaneously taken collision scenarios.
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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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