Mirrorlandia_minetest/Minetest-WorldEditAdditions
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perlin: use wea.bit.band

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Starbeamrainbowlabs 2021-07-17 21:34:50 +01:00
parent 5c7b5432d9
commit e4d3f26692
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1 changed files with 4 additions and 15 deletions
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worldeditadditions/lib/noise/engines/perlin.lua
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@ -58,9 +58,9 @@ end
function Perlin:noise( x, y, z ) function Perlin:noise( x, y, z )
y = y or 0 y = y or 0
z = z or 0 z = z or 0
local xi = self:BitAND(math.floor(x), 255) local xi = wea.bit.band(math.floor(x), 255)
local yi = self:BitAND(math.floor(y), 255) local yi = wea.bit.band(math.floor(y), 255)
local zi = self:BitAND(math.floor(z), 255) local zi = wea.bit.band(math.floor(z), 255)
-- print("x", x, "y", y, "z", z, "xi", xi, "yi", yi, "zi", zi) -- print("x", x, "y", y, "z", z, "xi", xi, "yi", yi, "zi", zi)
-- print("p[xi]", self.p[xi]) -- print("p[xi]", self.p[xi])
@ -109,17 +109,6 @@ function Perlin:noise( x, y, z )
) )
end end
function Perlin:BitAND(a, b) --Bitwise and
local p, c = 1, 0
while a > 0 and b > 0 do
local ra, rb = a%2, b%2
if ra + rb > 1 then c = c + p end
a, b, p = (a - ra) / 2, (b - rb) / 2, p * 2
end
return c
end
function Perlin:fade(t) function Perlin:fade(t)
return t * t * t * (t * (t * 6 - 15) + 10) return t * t * t * (t * (t * 6 - 15) + 10)
end end
@ -129,7 +118,7 @@ function Perlin:lerp(t, a, b)
end end
function Perlin:grad(hash, x, y, z) function Perlin:grad(hash, x, y, z)
local h = self:BitAND(hash, 15) local h = wea.bit.band(hash, 15)
local u = h < 8 and x or y local u = h < 8 and x or y
local v = h < 4 and y or ((h == 12 or h == 14) and x or z) local v = h < 4 and y or ((h == 12 or h == 14) and x or z)
return ((h and 1) == 0 and u or - u) + ((h and 2) == 0 and v or - v) return ((h and 1) == 0 and u or - u) + ((h and 2) == 0 and v or - v)