@thi.ng/shader-ast-stdlib/math/mix-cubic.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 { add, mul, sub } from "@thi.ng/shader-ast/ast/ops";
import { sym } from "@thi.ng/shader-ast/ast/sym";
const $ = (n, type) => defn(
  type,
  `mixCubic${n > 1 ? n : ""}`,
  [type, type, type, type, F],
  (a, b, c, d, t) => {
    let s;
    let s2;
    let t2;
    return [
      t2 = sym(mul(t, t)),
      s = sym(sub(1, t)),
      s2 = sym(mul(s, s)),
      ret(
        add(
          add(
            add(
              mul(a, mul(s, s2)),
              mul(b, mul(3, mul(s2, t)))
            ),
            mul(c, mul(3, mul(t2, s)))
          ),
          mul(d, mul(t, t2))
        )
      )
    ];
  }
);
const mixCubic = $(1, F);
const mixCubic2 = $(2, V2);
const mixCubic3 = $(3, V3);
const mixCubic4 = $(4, V4);
export {
  mixCubic,
  mixCubic2,
  mixCubic3,
  mixCubic4
};