@thi.ng/shader-ast-stdlib/isec/point.js

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

import { F, V2 } from "@thi.ng/shader-ast/api/types";
import { defn, ret } from "@thi.ng/shader-ast/ast/function";
import { bool } from "@thi.ng/shader-ast/ast/lit";
import { add } from "@thi.ng/shader-ast/ast/ops";
import { $x, $y } from "@thi.ng/shader-ast/ast/swizzle";
import { sym } from "@thi.ng/shader-ast/ast/sym";
import { distance, min, step } from "@thi.ng/shader-ast/builtin/math";
const isPointInCircle = defn(
  "bool",
  null,
  [V2, V2, F],
  (p, pos, radius) => [ret(bool(step(distance(p, pos), radius)))]
);
const isPointInRect = defn(
  "bool",
  null,
  [V2, V2, V2],
  (p, pos, size) => {
    let q;
    return [
      q = sym(min(step(pos, p), step(p, add(pos, size)))),
      ret(bool(min($x(q), $y(q))))
    ];
  }
);
export {
  isPointInCircle,
  isPointInRect
};