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dotgradient() is very hot and needs this result when indexing
din->grid[]. Since it doesn't change for a given din instance,
just cache the result @ din_new().
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Phil reported a crash in swab, illuminating an overflow in how the unit
cube was being scaled to the noise field dimensions.
Added some asserts enforcing critical assumptions as well, though it
will probably cost some FPS in din-heavy modules like swab.
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I'd like the output to fill the range -1..+1, but it's not doing that and I'm
uncertain on what exactly the scaling factor should be here.
In one reference a factor of 1/sqrt(.75) is specified, but in my tests that
doesn't seem to quite fill the range but it doesn't seem to blow it out so
it seems safe for now.
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This requires a forward declaration of v3f_t and changing din()
to take a v3f_t *.
The swab module needed updating to supply a pointer type and a
v3f_t definition.
This is being done so din.h users can have their own v3f
implementations. I might consolidate all the duplicated vector
code scattered throughout the libs and modules, but for now I'm
carrying on with the original intention of having modules be
largely self-contained. Though the introduction of libs like
ray and din has certainly violated that a bit already.
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This is a 3D noise field addressed as a unit cube.
The caller supplies the resolution of the noise field in three
dimensions.
I've just pulled in my v3f.h here, but it probably makes sense to
later on move vector headers into libs/ and share them. Later.
It's called din as in noise, because it's shorter than perlin and
noise.
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