strata-game-library/shaders / noiseSnippet

Variable: noiseSnippet

const noiseSnippet: "\nvec3 mod289(vec3 x) { return x - floor(x * (1.0 / 289.0)) * 289.0; }\nvec4 mod289(vec4 x) { return x - floor(x * (1.0 / 289.0)) * 289.0; }\nvec4 permute(vec4 x) { return mod289(((x * 34.0) + 1.0) * x); }\nvec4 taylorInvSqrt(vec4 r) { return 1.79284291400159 - 0.85373472095314 * r; }\n\nfloat simplex3D(vec3 v) {\n const vec2 C = vec2(1.0 / 6.0, 1.0 / 3.0);\n const vec4 D = vec4(0.0, 0.5, 1.0, 2.0);\n \n vec3 i = floor(v + dot(v, C.yyy));\n vec3 x0 = v - i + dot(i, C.xxx);\n \n vec3 g = step(x0.yzx, x0.xyz);\n vec3 l = 1.0 - g;\n vec3 i1 = min(g.xyz, l.zxy);\n vec3 i2 = max(g.xyz, l.zxy);\n \n vec3 x1 = x0 - i1 + C.xxx;\n vec3 x2 = x0 - i2 + C.yyy;\n vec3 x3 = x0 - D.yyy;\n \n i = mod289(i);\n vec4 p = permute(permute(permute(\n i.z + vec4(0.0, i1.z, i2.z, 1.0))\n + i.y + vec4(0.0, i1.y, i2.y, 1.0))\n + i.x + vec4(0.0, i1.x, i2.x, 1.0));\n \n float n_ = 0.142857142857;\n vec3 ns = n_ * D.wyz - D.xzx;\n \n vec4 j = p - 49.0 * floor(p * ns.z * ns.z);\n vec4 x_ = floor(j * ns.z);\n vec4 y_ = floor(j - 7.0 * x_);\n \n vec4 x = x_ * ns.x + ns.yyyy;\n vec4 y = y_ * ns.x + ns.yyyy;\n vec4 h = 1.0 - abs(x) - abs(y);\n \n vec4 b0 = vec4(x.xy, y.xy);\n vec4 b1 = vec4(x.zw, y.zw);\n \n vec4 s0 = floor(b0) * 2.0 + 1.0;\n vec4 s1 = floor(b1) * 2.0 + 1.0;\n vec4 sh = -step(h, vec4(0.0));\n \n vec4 a0 = b0.xzyw + s0.xzyw * sh.xxyy;\n vec4 a1 = b1.xzyw + s1.xzyw * sh.zzww;\n \n vec3 p0 = vec3(a0.xy, h.x);\n vec3 p1 = vec3(a0.zw, h.y);\n vec3 p2 = vec3(a1.xy, h.z);\n vec3 p3 = vec3(a1.zw, h.w);\n \n vec4 norm = taylorInvSqrt(vec4(dot(p0, p0), dot(p1, p1), dot(p2, p2), dot(p3, p3)));\n p0 *= norm.x;\n p1 *= norm.y;\n p2 *= norm.z;\n p3 *= norm.w;\n \n vec4 m = max(0.6 - vec4(dot(x0, x0), dot(x1, x1), dot(x2, x2), dot(x3, x3)), 0.0);\n m = m * m;\n return 42.0 * dot(m * m, vec4(dot(p0, x0), dot(p1, x1), dot(p2, x2), dot(p3, x3)));\n}"

Defined in: materials/index.ts:80