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This doesn't seem to make any impact on performance, but it's
awkward to be modifying the supplied coordinate as if it's a
result... the coordinate input should be left alone, and should
be able to get reused across din calls so only the varying
members need to get updated across calls.
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din() just samples the din_t which will always just be a
read-only operation, so constify this. It might even help the
compiler generate faster code for din-heavy inner loops like
modules/swab uses.
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also update call sites in modules/{meta2d,swab} accordingly
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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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