games/ComfyFactorio
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to local

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This commit is contained in:
MewMew 2020-02-05 09:38:13 +01:00
parent 080845d948
commit 1860b911ed
1 changed files with 8 additions and 5 deletions
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13
utils/simplex_noise.lua
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@ -3,6 +3,9 @@
local Simplex = {}
local bit32_band = bit32.band
local math_floor = math.floor
-- 2D simplex noise
local grad3 = {
@ -26,7 +29,7 @@ local p = {151,160,137,91,90,15,
138,236,205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180}
local perm = {}
for i=0,511 do
perm[i+1] = p[bit32.band(i, 255) + 1]
perm[i+1] = p[bit32_band(i, 255) + 1]
end
-- special case of dot with 3 inputs
@ -52,8 +55,8 @@ function Simplex.d2(xin, yin,seed)
local n0, n1, n2 -- Noise contributions from the three corners
-- Skew the input space to determine which simplex cell we're in
local s = (xin+yin)*F2; -- Hairy factor for 2D
local i = math.floor(xin+s)
local j = math.floor(yin+s)
local i = math_floor(xin+s)
local j = math_floor(yin+s)
local t = (i+j)*G2
local X0 = i-t -- Unskew the cell origin back to (x,y) space
local Y0 = j-t
@ -78,8 +81,8 @@ function Simplex.d2(xin, yin,seed)
local y2 = y0 - 1 + 2 * G2
-- Work out the hashed gradient indices of the three simplex corners
local ii = bit32.band(i, 255)
local jj = bit32.band(j, 255)
local ii = bit32_band(i, 255)
local jj = bit32_band(j, 255)
local gi0 = perm[ii + perm[jj+1]+1] % 12
local gi1 = perm[ii + i1 + perm[jj + j1+1]+1] % 12
local gi2 = perm[ii + 1 + perm[jj + 1+1]+1] % 12