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lua/stormfox2/lib/sv_perlin.lua
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139
lua/stormfox2/lib/sv_perlin.lua
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--[[
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| This file was obtained through the combined efforts
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| of Madbluntz & Plymouth Antiquarian Society.
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|
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| Credits: lifestorm, Gregory Wayne Rossel JR.,
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| Maloy, DrPepper10 @ RIP, Atle!
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| Visit for more: https://plymouth.thetwilightzone.ru/
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--]]
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--[[
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Implemented as described here:
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http://flafla2.github.io/2014/08/09/perlinnoise.html
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Copied from: https://gist.github.com/SilentSpike/25758d37f8e3872e1636d90ad41fe2ed
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]]--
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local floor,band,clamp,max = math.floor,bit.band,math.Clamp,math.max
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perlin = {}
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local p = {}
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-- Hash lookup table as defined by Ken Perlin
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-- This is a randomly arranged array of all numbers from 0-255 inclusive
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local permutation = {151,160,137,91,90,15,
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131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10,23,
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190, 6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33,
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88,237,149,56,87,174,20,125,136,171,168, 68,175,74,165,71,134,139,48,27,166,
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77,146,158,231,83,111,229,122,60,211,133,230,220,105,92,41,55,46,245,40,244,
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102,143,54, 65,25,63,161, 1,216,80,73,209,76,132,187,208, 89,18,169,200,196,
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135,130,116,188,159,86,164,100,109,198,173,186, 3,64,52,217,226,250,124,123,
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5,202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42,
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223,183,170,213,119,248,152, 2,44,154,163, 70,221,153,101,155,167, 43,172,9,
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129,22,39,253, 19,98,108,110,79,113,224,232,178,185, 112,104,218,246,97,228,
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251,34,242,193,238,210,144,12,191,179,162,241, 81,51,145,235,249,14,239,107,
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49,192,214, 31,181,199,106,157,184, 84,204,176,115,121,50,45,127, 4,150,254,
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138,236,205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180
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}
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-- p is used to hash unit cube coordinates to [0, 255]
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for i = 0,255 do
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-- Convert to 0 based index table
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p[i] = permutation[i + 1]
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-- Repeat the array to avoid buffer overflow in hash function
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p[i + 256] = permutation[i + 1]
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end
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-- Functions
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local dot_product = {
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[0x0] = function(x,y,z) return x + y end,
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[0x1] = function(x,y,z) return -x + y end,
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[0x2] = function(x,y,z) return x - y end,
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[0x3] = function(x,y,z) return -x - y end,
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[0x4] = function(x,y,z) return x + z end,
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[0x5] = function(x,y,z) return -x + z end,
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[0x6] = function(x,y,z) return x - z end,
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[0x7] = function(x,y,z) return -x - z end,
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[0x8] = function(x,y,z) return y + z end,
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[0x9] = function(x,y,z) return -y + z end,
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[0xA] = function(x,y,z) return y - z end,
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[0xB] = function(x,y,z) return -y - z end,
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[0xC] = function(x,y,z) return y + x end,
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[0xD] = function(x,y,z) return -y + z end,
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[0xE] = function(x,y,z) return y - x end,
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[0xF] = function(x,y,z) return -y - z end
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}
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local function grad(hash, x, y, z)
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return dot_product[band(hash,0xF)](x,y,z)
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end
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local function fade(t)
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return t * t * t * (t * (t * 6 - 15) + 10)
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end
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local function lerp(t, a, b)
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return a + t * (b - a)
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end
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function perlin.noise(x, y, z, zoom) -- [-1 , 1]
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zoom = zoom or 100
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x = x / zoom
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y = y and y / zoom or 0
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z = z and z / zoom or 0
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-- Calculate the "unit cube" that the point asked will be located in
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local xi = floor(x) % 256
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local yi = floor(y) % 256
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local zi = floor(z) % 256
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-- Next we calculate the location (from 0 to 1) in that cube
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x = x - floor(x)
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y = y - floor(y)
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z = z - floor(z)
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-- We also fade the location to smooth the result
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local u = fade(x)
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local v = fade(y)
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local w = fade(z)
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-- Hash all 8 unit cube coordinates surrounding input coordinate
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local A = p[xi ] + yi
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local AA = p[A ] + zi
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local AB = p[A + 1 ] + zi
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local AAA = p[ AA ]
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local ABA = p[ AB ]
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local AAB = p[ AA + 1 ]
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local ABB = p[ AB + 1 ]
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local B = p[xi + 1] + yi
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local BA = p[B ] + zi
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local BB = p[B + 1 ] + zi
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local BAA = p[ BA ]
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local BBA = p[ BB ]
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local BAB = p[ BA + 1 ]
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local BBB = p[ BB + 1 ]
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-- Take the weighted average between all 8 unit cube coordinates
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return lerp(w,
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lerp(v,
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lerp(u,
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grad(AAA,x,y,z),
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grad(BAA,x-1,y,z)
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),
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lerp(u,
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grad(ABA,x,y-1,z),
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grad(BBA,x-1,y-1,z)
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)
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),
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lerp(v,
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lerp(u,
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grad(AAB,x,y,z-1), grad(BAB,x-1,y,z-1)
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),
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lerp(u,
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grad(ABB,x,y-1,z-1), grad(BBB,x-1,y-1,z-1)
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)
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)
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)
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end
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function perlin.range(x, y ,z, zoom) -- [0 - 1]
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return (1 + perlinnoise(x, y, z, zoom)) / 2
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end
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function perlin.rangeSub(x, y, z , zoom, n)
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return max(0,(perlin.range(x, y ,z, zoom) - n ) / (1 - n))
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end
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