@thi.ng/shader-ast-stdlib/noise/permute.js

Function collection for modular GPGPU / shader programming with @thi.ng/shader-ast

import { F, V2, V3, V4 } from "@thi.ng/shader-ast/api/types";
import { defn, ret } from "@thi.ng/shader-ast/ast/function";
import { FLOAT1, float } from "@thi.ng/shader-ast/ast/lit";
import { add, mul } from "@thi.ng/shader-ast/ast/ops";
import { mod } from "@thi.ng/shader-ast/builtin/math";
const __permute = (type, suffix = "") => defn(type, `permute${suffix}`, [type], (v) => [
  ret(mod(mul(v, add(mul(v, float(34)), FLOAT1)), float(289)))
]);
const permute = __permute(F);
const permute2 = __permute(V2, "2");
const permute3 = __permute(V3, "3");
const permute4 = __permute(V4, "4");
export {
  permute,
  permute2,
  permute3,
  permute4
};