kampos
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Tiny and fast effects compositor on WebGL
154 lines (123 loc) • 4.67 kB
JavaScript
/*!
* Cellular noise ("Worley noise") in 3D in GLSL.
* Author: Stefan Gustavson (stefan.gustavson@liu.se)
* Version: Stefan Gustavson 2011-04-19
*
* Many thanks to Ian McEwan of Ashima Arts for the
* ideas for permutation and gradient selection.
*
* Copyright (c) 2011 Stefan Gustavson. All rights reserved.
* Distributed under the MIT license. See LICENSE file.
* https://github.com/ashima/webgl-noise
*/
/**
* Cellular noise ("Worley noise") in 3D in GLSL. Exposes a `noise(vec3 P)` function for use inside fragment shaders.
*/
export default `
vec3 mod289(vec3 x) {
return x - floor(x * (1.0 / 289.0)) * 289.0;
}
// Modulo 7 without a division
vec3 mod7(vec3 x) {
return x - floor(x * (1.0 / 7.0)) * 7.0;
}
// Permutation polynomial: (34x^2 + x) mod 289
vec3 permute(vec3 x) {
return mod289((34.0 * x + 1.0) * x);
}
float noise(vec3 P) {
vec3 Pi = mod289(floor(P));
vec3 Pf = fract(P) - 0.5;
vec3 Pfx = Pf.x + vec3(1.0, 0.0, -1.0);
vec3 Pfy = Pf.y + vec3(1.0, 0.0, -1.0);
vec3 Pfz = Pf.z + vec3(1.0, 0.0, -1.0);
vec3 p = permute(Pi.x + vec3(-1.0, 0.0, 1.0));
vec3 p1 = permute(p + Pi.y - 1.0);
vec3 p2 = permute(p + Pi.y);
vec3 p3 = permute(p + Pi.y + 1.0);
vec3 p11 = permute(p1 + Pi.z - 1.0);
vec3 p12 = permute(p1 + Pi.z);
vec3 p13 = permute(p1 + Pi.z + 1.0);
vec3 p21 = permute(p2 + Pi.z - 1.0);
vec3 p22 = permute(p2 + Pi.z);
vec3 p23 = permute(p2 + Pi.z + 1.0);
vec3 p31 = permute(p3 + Pi.z - 1.0);
vec3 p32 = permute(p3 + Pi.z);
vec3 p33 = permute(p3 + Pi.z + 1.0);
vec3 ox11 = fract(p11*K) - Ko;
vec3 oy11 = mod7(floor(p11*K))*K - Ko;
vec3 oz11 = floor(p11*K2)*Kz - Kzo; // p11 < 289 guaranteed
vec3 ox12 = fract(p12*K) - Ko;
vec3 oy12 = mod7(floor(p12*K))*K - Ko;
vec3 oz12 = floor(p12*K2)*Kz - Kzo;
vec3 ox13 = fract(p13*K) - Ko;
vec3 oy13 = mod7(floor(p13*K))*K - Ko;
vec3 oz13 = floor(p13*K2)*Kz - Kzo;
vec3 ox21 = fract(p21*K) - Ko;
vec3 oy21 = mod7(floor(p21*K))*K - Ko;
vec3 oz21 = floor(p21*K2)*Kz - Kzo;
vec3 ox22 = fract(p22*K) - Ko;
vec3 oy22 = mod7(floor(p22*K))*K - Ko;
vec3 oz22 = floor(p22*K2)*Kz - Kzo;
vec3 ox23 = fract(p23*K) - Ko;
vec3 oy23 = mod7(floor(p23*K))*K - Ko;
vec3 oz23 = floor(p23*K2)*Kz - Kzo;
vec3 ox31 = fract(p31*K) - Ko;
vec3 oy31 = mod7(floor(p31*K))*K - Ko;
vec3 oz31 = floor(p31*K2)*Kz - Kzo;
vec3 ox32 = fract(p32*K) - Ko;
vec3 oy32 = mod7(floor(p32*K))*K - Ko;
vec3 oz32 = floor(p32*K2)*Kz - Kzo;
vec3 ox33 = fract(p33*K) - Ko;
vec3 oy33 = mod7(floor(p33*K))*K - Ko;
vec3 oz33 = floor(p33*K2)*Kz - Kzo;
vec3 dx11 = Pfx + jitter*ox11;
vec3 dy11 = Pfy.x + jitter*oy11;
vec3 dz11 = Pfz.x + jitter*oz11;
vec3 dx12 = Pfx + jitter*ox12;
vec3 dy12 = Pfy.x + jitter*oy12;
vec3 dz12 = Pfz.y + jitter*oz12;
vec3 dx13 = Pfx + jitter*ox13;
vec3 dy13 = Pfy.x + jitter*oy13;
vec3 dz13 = Pfz.z + jitter*oz13;
vec3 dx21 = Pfx + jitter*ox21;
vec3 dy21 = Pfy.y + jitter*oy21;
vec3 dz21 = Pfz.x + jitter*oz21;
vec3 dx22 = Pfx + jitter*ox22;
vec3 dy22 = Pfy.y + jitter*oy22;
vec3 dz22 = Pfz.y + jitter*oz22;
vec3 dx23 = Pfx + jitter*ox23;
vec3 dy23 = Pfy.y + jitter*oy23;
vec3 dz23 = Pfz.z + jitter*oz23;
vec3 dx31 = Pfx + jitter*ox31;
vec3 dy31 = Pfy.z + jitter*oy31;
vec3 dz31 = Pfz.x + jitter*oz31;
vec3 dx32 = Pfx + jitter*ox32;
vec3 dy32 = Pfy.z + jitter*oy32;
vec3 dz32 = Pfz.y + jitter*oz32;
vec3 dx33 = Pfx + jitter*ox33;
vec3 dy33 = Pfy.z + jitter*oy33;
vec3 dz33 = Pfz.z + jitter*oz33;
vec3 d11 = dx11 * dx11 + dy11 * dy11 + dz11 * dz11;
vec3 d12 = dx12 * dx12 + dy12 * dy12 + dz12 * dz12;
vec3 d13 = dx13 * dx13 + dy13 * dy13 + dz13 * dz13;
vec3 d21 = dx21 * dx21 + dy21 * dy21 + dz21 * dz21;
vec3 d22 = dx22 * dx22 + dy22 * dy22 + dz22 * dz22;
vec3 d23 = dx23 * dx23 + dy23 * dy23 + dz23 * dz23;
vec3 d31 = dx31 * dx31 + dy31 * dy31 + dz31 * dz31;
vec3 d32 = dx32 * dx32 + dy32 * dy32 + dz32 * dz32;
vec3 d33 = dx33 * dx33 + dy33 * dy33 + dz33 * dz33;
vec3 d1 = min(min(d11,d12), d13);
vec3 d2 = min(min(d21,d22), d23);
vec3 d3 = min(min(d31,d32), d33);
vec3 d = min(min(d1,d2), d3);
d.x = min(min(d.x,d.y),d.z);
return sqrt(d.x);
}
`;