games/ComfyFactorio
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perlin - made it faster when using in loop

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This commit is contained in:
Gerkiz 2022-04-07 16:12:25 +02:00
parent 86ae1d5c9b
commit 095895ed81
1 changed files with 4 additions and 8 deletions
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12
utils/simplex_noise.lua
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@ -286,11 +286,6 @@ for i = 0, 511 do
perm[i + 1] = p[bit32_band(i, 255) + 1]
end
-- special case of dot with 3 inputs
local function dot2(g, x, y)
return x * g[1] + y * g[2]
end
local F2 = 0.5 * (math.sqrt(3.0) - 1.0)
local G2 = (3.0 - math.sqrt(3.0)) / 6.0
@ -317,6 +312,7 @@ function Simplex.d2(xin, yin, seed)
i1 = 0
j1 = 1
end
-- upper triangle, YX order: (0,0)->(0,1)->(1,1)
-- A step of (1,0) in (i,j) means a step of (1-c,-c) in (x,y), and
-- a step of (0,1) in (i,j) means a step of (-c,1-c) in (x,y), where
@ -339,7 +335,7 @@ function Simplex.d2(xin, yin, seed)
n0 = 0.0
else
t0 = t0 * t0
n0 = t0 * t0 * dot2(grad3[gi0 + 1], x0, y0) -- (x,y) of grad3 used for 2D gradient
n0 = t0 * t0 * (x0 * grad3[gi0 + 1][1] + y0 * grad3[gi0 + 1][2]) -- (x,y) of grad3 used for 2D gradient
end
local t1 = 0.5 - x1 * x1 - y1 * y1
@ -347,7 +343,7 @@ function Simplex.d2(xin, yin, seed)
n1 = 0.0
else
t1 = t1 * t1
n1 = t1 * t1 * dot2(grad3[gi1 + 1], x1, y1)
n1 = t1 * t1 * (x1 * grad3[gi1 + 1][1] + y1 * grad3[gi1 + 1][2])
end
local t2 = 0.5 - x2 * x2 - y2 * y2
@ -355,7 +351,7 @@ function Simplex.d2(xin, yin, seed)
n2 = 0.0
else
t2 = t2 * t2
n2 = t2 * t2 * dot2(grad3[gi2 + 1], x2, y2)
n2 = t2 * t2 * (x2 * grad3[gi2 + 1][1] + y2 * grad3[gi2 + 1][2])
end
-- Add contributions from each corner to get the final noise value.