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Just adds TIL_FB_DRAW_FLAG_TEXTURABLE so callers can granularly
inhibit texturing if desired.
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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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Fragmenting is often dimensioned according to the number of cpus,
and by not supplying this to the fragmenter it was made rather
common for module contexts to plumb this themselves - in some
cases incorporating a context type/create/destroy rigamarole
for the n_cpus circuit alone.
So just plumb it in libtil, and the prepare_frame functions can
choose to ignore it if they have something more desirable onhand.
Future commits will remove a bunch of n_cpus from module contexts
in favor of this.
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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 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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This adds a checkers style overlay module, it's not terribly
interesting but may be made more useful if modules start
differentiating themselves as substantial vs. overlay effects.
It'd be nice if rtv/compose could automagically apply and
randomize overlay modules atop others, which would make use of
this type of thing as well as encourage more small modules like
these be written.
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