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Idea here is to provide texture sources for obtaining pixel
colors at the til_fb_put_pixel/fill drawing API, making it
possible for at least overlayable modules to serve as
mask/stencil operators where their drawn areas are populated by
the contents of another fragment produced dynamically,
potentially by other modules altogether.
This commit adds a texture=modulename option to the compose
module for specifying if a texture should be used when
compositing, excepting and defaulting to "none" for disabling
texturing.
A future commit should expand this compose option to accept a
potential list of modules for composing the texture in the same
way as the main layers= list functions.
Something this all immediately makes clear is the need for
a better settings syntax, probably in the form of all module
setting specifiers optionally being followed by a squence
of settings, with support for escaping to handle nested
situations.
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Just one case, modules/submit, was using 32x32 tiles and is now
using 64x64. I don't expect it to make any difference.
While here I fixed up the num_cpus/n_cpus naming inconsistencies,
normalizing on n_cpus.
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Originally it seemed sensible to make these units of bytes, for
flexibility reasons.
But it's advantageous for everything to be able to assume pixels
are always 4-byte/32-bit aligned. Having the stride/pitch be in
bytes of units made it theoretically possible to produce
unaligned rows of pixels, which would break that assumption.
I don't think anything was ever actually producing such things,
and I've added some asserts to the {sdl,drm}_fb.c page
acquisition code to go fatal on such pages.
This change required going through all the modules and get rid of
their uint32_t vs. void* dances and other such 1-byte vs. 4-byte
scaling arithmetic.
Code is simpler now, and probably faster in some cases. And now
allows future work to just assume things cna always occur 4-bytes
at a time without concern for unaligned accesses.
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This adds count=N and orientation={horizontal,vertical} settings.
Which was precipitated by the introduction of a vertical blinds
mode.
e.g.:
--module=blinds,count=32,orientation=vertical
or for a quick tour of the possibilities:
--module=rtv,channels=blinds,duration=1,context_duration=1,snow_duration=0
weeeee
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In the interests of facilitating randomized automagic layered
compositing, tell the world when you're overlay-appropriate.
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This isn't super interesting but I might just start adding
simplistic overlay style modules for compositing/transition use.
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