@thi.ng/shader-ast-stdlib/color/rgbe.js

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

import { V3 } 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 { INT0, VEC3_0, float, vec3 } from "@thi.ng/shader-ast/ast/lit";
import { gt, mul, sub } from "@thi.ng/shader-ast/ast/ops";
import { $w, $xyz } from "@thi.ng/shader-ast/ast/swizzle";
import { exp2 } from "@thi.ng/shader-ast/builtin/math";
const decodeRGBE = defn(V3, "decodeRGBE", ["ivec4"], (col) => {
  return [
    ret(
      ternary(
        gt($w(col), INT0),
        mul(vec3($xyz(col)), exp2(float(sub($w(col), 136)))),
        VEC3_0
      )
    )
  ];
});
export {
  decodeRGBE
};