@thi.ng/shader-ast-stdlib/math/fit.js

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

import { F } from "@thi.ng/shader-ast/api/types";
import { ternary } from "@thi.ng/shader-ast/ast/controlflow";
import { defn, ret } from "@thi.ng/shader-ast/ast/function";
import { FLOAT0, FLOAT05, FLOAT1, FLOAT2 } from "@thi.ng/shader-ast/ast/lit";
import { add, div, mul, neq, sub } from "@thi.ng/shader-ast/ast/ops";
import { mix } from "@thi.ng/shader-ast/builtin/math";
import { clamp01 } from "./clamp.js";
const fitNorm1 = defn(F, "fitNorm1", [F, F, F], (x, a, b) => [
  ret(ternary(neq(a, b), div(sub(x, a), sub(b, a)), FLOAT0))
]);
const fitNorm = (x, a, b) => div(sub(x, a), sub(b, a));
const fit = (x, a, b, c, d) => mix(c, d, fitNorm(x, a, b));
const fitClamped = (x, a, b, c, d) => mix(c, d, clamp01(div(sub(x, a), sub(b, a))));
const fit01 = (a, b, c) => mix(b, c, a);
const fit1101 = (x) => add(mul(x, FLOAT05), FLOAT05);
const fit0111 = (x) => sub(mul(x, FLOAT2), FLOAT1);
export {
  fit,
  fit01,
  fit0111,
  fit1101,
  fitClamped,
  fitNorm,
  fitNorm1
};