activetheory

float levelChannel(float inPixel, float inBlack, float inGamma, float inWhite, float outBlack, float outWhite) {
    return (pow(((inPixel * 255.0) - inBlack) / (inWhite - inBlack), inGamma) * (outWhite - outBlack) + outBlack) / 255.0;
}

vec3 levels(vec3 inPixel, float inBlack, float inGamma, float inWhite, float outBlack, float outWhite) {
    vec3 o = vec3(1.0);
    o.r = levelChannel(inPixel.r, inBlack, inGamma, inWhite, outBlack, outWhite);
    o.g = levelChannel(inPixel.g, inBlack, inGamma, inWhite, outBlack, outWhite);
    o.b = levelChannel(inPixel.b, inBlack, inGamma, inWhite, outBlack, outWhite);
    return o;

edankwan

// port from GLSL code base on https://github.com/ashima/webgl-noise/blob/master/src/noise2D.glsl

//JS SNOISE PORT

function snoise2d(x, y) {

    var C0 = 0.211324865405187;
    var C1 = -0.577350269189626;
    var C2 = 1.79284291400159;
    var OVER_289 = 1 / 289;

paulirish

// http://paulirish.com/2011/requestanimationframe-for-smart-animating/
// http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating

// requestAnimationFrame polyfill by Erik Möller. fixes from Paul Irish and Tino Zijdel

// MIT license

(function() {
    var lastTime = 0;
    var vendors = ['ms', 'moz', 'webkit', 'o'];