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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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To facilitate random setting of these flexible string-oriented
settings, support a random helper supplied with the description.
This helper would return a valid random string to be used with the
respective setting being described.
Immediate use case is the rtv module, which also gets fixed up to
use it in this commit.
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This is just a quick stab at randomizing settings, only multiple
choice setings are randomized currently.
For modules with settings, a new Settings: field is added to the
caption showing the settings as the arguments one would pass to
rototiller's module argument.
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Consolidate the time() calls in setup_next_module() by using a now
variable.
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This broke when snow was added.
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The idea is to have captions similar to how MTV did back in the 80s.
It'd be nice to make the text resolution independent, but this is a
good first stab for an afternoon of tooling around.
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This uses the newly added snow module as a transition between modules
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This is sort of a meta renderer, as it simply renders other
modules in its prepare_frame() stage. They're still threaded
as the newly public rototiller_module_render() utilizes the
threading machinery, it just needs to be called from the serial
phase @ prepare_frame().
I'm pretty sure this module will leak memory every time it changes
modules, since the existing cleanup paths for the modules hasn't
needed to be thorough in the least. So that's something to fix
in a later commit, go through all the modules and make sure their
destroy_context() entrypoints actually cleans everything up.
See the source for some rtv-specific TODOs.
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