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2020-01-25rototiller: introduce ticks and wire up to modulesVito Caputo
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.
2020-01-08modules/flui2d: static-ify flui2d_setup()Vito Caputo
2019-11-24rototiller: rototiller_fragmenter_t s/num/number/Vito Caputo
Mechanical change removing abbreviation for consistency
2019-11-23rototiller: pass cpu to .render_fragment()Vito Caputo
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().
2019-11-23rototiller: pass num_cpus to .create_context()Vito Caputo
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.
2019-11-10flui2d: add some rudimentary settingsVito Caputo
Viscosity and diffusion are supported, it'd be neat to add a configurable size (the ROOT define) for the flow field in the future. I didn't go crazy here, it's just a list of orders of magnitude you choose from for each. It'd probably be more interesting to change this into a single knob with descriptive names like "smoke" "goop" "water" mapping to a LUT.
2019-10-16modules/flui2d: fix spelling of paper's authorVito Caputo
s/Joe/Jos/, I should wear my glasses more.
2019-10-14modules/flui2d: add 2D fluid dynamics simulationVito Caputo
This implements near verbatim the code found in the paper titled: Real-Time Fluid Dynamics for Games By Jos Stam It sometimes has the filename GDC03.PDF, or Stam_fluids_GDC03.pdf The density field is rendered using simple linear interpolation of the samples, in a grayscale palette. No gamma correction is being performed. There are three configurable defines of interest: VISCOSITY, DIFFUSION, and ROOT. This module is only threaded in the drawing stage, so basically the linear interpolation uses multiple cores. The simulation itself is not threaded, the implementation from the paper made no such considerations. It would be nice to reimplement this in a threaded fashion with a good generalized API, then move it into libs. Something where a unit square can be sampled for interpolated densities would be nice. Then extend it into 3 dimensions for volumetric effects...
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