mirror of
https://github.com/ComfyFactory/ComfyFactorio.git
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125 lines
3.5 KiB
Lua
125 lines
3.5 KiB
Lua
-- Original implementation taken from here https://github.com/thenumbernine/lua-simplexnoise/blob/master/2d.lua
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local public, this = {}, {}
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local _global = require("utils.global")
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local _common = require(".common")
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_global.register(this, function(t) this = t end)
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this.perm = {}
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this.seed = 0
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this.grad3 = {
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{1, 1, 0}, {-1, 1, 0}, {1, -1, 0}, {-1, -1 ,0},
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{1, 0, 1}, {-1, 0, 1}, {1, 0, -1}, {-1, 0, -1},
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{0, 1, 1}, {0, -1, 1}, {0, 1, -1}, {0, -1, -1}
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}
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this.p = {
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151, 160, 137, 91, 90, 15, 131, 13, 201,
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95, 96, 53, 194, 233, 7, 225, 140, 36,
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103, 30, 69, 142, 8, 99, 37, 240, 21, 10,
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23, 190, 6, 148, 247, 120, 234, 75, 0, 26,
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197, 62, 94, 252, 219, 203, 117, 35, 11,
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32, 57, 177, 33, 88, 237, 149, 56, 87,
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174, 20, 125, 136, 171, 168, 68, 175, 74,
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165, 71, 134, 139, 48, 27, 166, 77, 146,
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158, 231, 83, 111, 229, 122, 60, 211, 133,
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230, 220, 105, 92, 41, 55, 46, 245, 40,
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244, 102, 143, 54, 65, 25, 63, 161, 1,
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216, 80, 73, 209, 76, 132, 187, 208, 89,
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18, 169, 200, 196, 135, 130, 116, 188,
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159, 86, 164, 100, 109, 198, 173, 186,
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3, 64, 52, 217, 226, 250, 124, 123, 5, 202,
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38, 147, 118, 126, 255, 82, 85, 212, 207,
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206, 59, 227, 47, 16, 58, 17, 182, 189,
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28, 42, 223, 183, 170, 213, 119, 248, 152,
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2, 44, 154, 163, 70, 221, 153, 101, 155,
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167, 43, 172, 9, 129, 22, 39, 253, 19,
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98, 108, 110, 79, 113, 224, 232, 178, 185,
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112, 104, 218, 246, 97, 228, 251, 34, 242,
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193, 238, 210, 144, 12, 191, 179, 162, 241,
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81, 51, 145, 235, 249, 14, 239, 107, 49, 192,
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214, 31, 181, 199, 106, 157, 184, 84, 204,
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176, 115, 121, 50, 45, 127, 4, 150, 254,
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138, 236, 205, 93, 222, 114, 67, 29, 24, 72,
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243, 141, 128, 195, 78, 66, 215, 61, 156, 180
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}
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local function dot(a, b)
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local sum = 0
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for i = 1, #b do
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sum = sum + (a[i] * b[i])
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end
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return sum
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end
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public.init = function()
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local rng = game.create_random_generator()
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this.seed = rng(1, 4294967295)
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for i = 0, 511 do
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this.perm[i + 1] = this.p[bit32.band(i, 255) + 1]
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end
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end
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public.get = function(pos, resolution)
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local x = (_common.get_axis(pos, 'x') + this.seed) * resolution
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local y = (_common.get_axis(pos, 'y') + this.seed) * resolution
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local n0, n1, n2
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local F2 = 0.5*(math.sqrt(3.0)-1.0)
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local s = (x + y) * F2;
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local i = math.floor(x + s)
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local j = math.floor(y + s)
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local G2 = (3.0-math.sqrt(3.0))/6.0
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local t = (i+j)*G2
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local X0 = i-t
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local Y0 = j-t
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local x0 = x - X0
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local y0 = y -Y0
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local i1, j1
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if x0 > y0 then
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i1 = 1
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j1 = 0
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else
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i1 = 0
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j1 = 1
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end
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local x1 = x0 - i1 + G2
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local y1 = y0 - j1 + G2
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local x2 = x0 - 1 + 2 * G2
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local y2 = y0 - 1 + 2 * G2
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local ii = bit32.band(i, 255)
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local jj = bit32.band(j, 255)
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local gi0 = this.perm[ii + this.perm[jj+1]+1] % 12
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local gi1 = this.perm[ii + i1 + this.perm[jj + j1+1]+1] % 12
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local gi2 = this.perm[ii + 1 + this.perm[jj + 1+1]+1] % 12
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-- Calculate the contribution from the three corners
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local t0 = 0.5 - x0 * x0 - y0 * y0
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if t0 < 0 then
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n0 = 0.0
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else
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t0 = t0 * t0
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n0 = t0 * t0 * dot(this.grad3[gi0+1], {x0, y0})
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end
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local t1 = 0.5 - x1 * x1 - y1 * y1
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if t1 < 0 then
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n1 = 0.0
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else
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t1 = t1 * t1
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n1 = t1 * t1 * dot(this.grad3[gi1+1], {x1, y1})
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end
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local t2 = 0.5 - x2 * x2 - y2 * y2
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if t2 < 0 then
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n2 = 0.0
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else
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t2 = t2 * t2
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n2 = t2 * t2 * dot(this.grad3[gi2+1], {x2, y2})
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end
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return 70.0 * (n0 + n1 + n2)
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end
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return public
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