threepipe/lib/utils/color-encodings.js

A 3D viewer framework built on top of three.js in TypeScript with a focus on quality rendering, modularity and extensibility.

import { Color, Vector4 } from 'three';
// todo: move these to ts-browser-helpers maybe
// reference: http://iwasbeingirony.blogspot.ca/2010/06/difference-between-rgbm-and-rgbd.html
export function vRGBMToLinear(value, maxRange) {
    value.multiplyScalar(value.w * maxRange);
    value.w = 1.0;
    return value;
}
export function cRGBMToLinear(value, maxRange) {
    vRGBMToLinear(value, maxRange);
    return new Color(value.x, value.y, value.z);
}
export function vLinearToRGBM(value, maxRange) {
    const maxRGB = Math.max(value.x, Math.max(value.y, value.z));
    let M = Math.max(Math.min(maxRGB / maxRange, 1.0), 0.0);
    M = Math.ceil(M * 255.0) / 255.0;
    value.divideScalar(M * maxRange);
    value.w = M;
    return value;
}
export function cLinearToRGBM(value, maxRange) {
    return vLinearToRGBM(new Vector4(value.r, value.g, value.b, 1.0), maxRange);
}
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