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✏️ Editing: smoke.js

(function ($) {
    "use strict";
    window.ga = window.ga || function () {
        (ga.q = ga.q || []).push(arguments)
    };
    ga.l = +new Date;
    ga('create', 'UA-105392568-1', 'auto');
    ga('send', 'pageview');

function lightOrDark(color) {
        
        let r;
        let g;
        let b;
        let hsp;

// Check the format of the color, HEX or RGB?
        if (color.match(/^rgb/)) {

// If HEX --> store the red, green, blue values in separate variables
            color = color.match(/^rgba?$(\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+(?:\.\d+)?))?$$/);

r = color[1];
            g = color[2];
            b = color[3];
        }
        else {

// If RGB --> Convert it to HEX: http://gist.github.com/983661
            color = +("0x" + color.slice(1).replace(
                color.length < 5 && /./g, '$&$&'
            )
            );

r = color >> 16;
            g = color >> 8 & 255;
            b = color & 255;
        }

// HSP equation from http://alienryderflex.com/hsp.html
        hsp = Math.sqrt(
            0.299 * (r * r) +
            0.587 * (g * g) +
            0.114 * (b * b)
        );

// Using the HSP value, determine whether the color is light or dark
        if (hsp > 127.5) {

return 'light';
        }
        else {

return 'dark';
        }
    }

$(document).ready(function () {
        let bgColor = $("body").css('background-color') ? $("body").css('background-color') : $("body").css('background');
        let brightness = lightOrDark(bgColor);
        console.log(brightness)
        let canvasBackColor;
        let canvasColor;
        if(brightness == 'dark'){
            canvasBackColor = {
                r: 2,
                g: 3,
                b: 15
            }
        } else {
            canvasBackColor = {
                r: 255,
                g: 255,
                b: 255
            }
        }
        const canvas = document.getElementsByTagName("canvas")[0];
        canvas.width = canvas.clientWidth;
        canvas.height = canvas.clientHeight;

let config = {
            SIM_RESOLUTION: 128,
            DYE_RESOLUTION: 512,
            DENSITY_DISSIPATION: 0.97,
            VELOCITY_DISSIPATION: 0.98,
            PRESSURE_DISSIPATION: 0.8,
            PRESSURE_ITERATIONS: 20,
            CURL: 30,
            SPLAT_RADIUS: 0.1,
            SHADING: false,
            COLORFUL: false,
            PAUSED: false,
            BACK_COLOR: canvasBackColor,
            TRANSPARENT: false,
            BLOOM: false,
            BLOOM_ITERATIONS: 8,
            BLOOM_RESOLUTION: 256,
            BLOOM_INTENSITY: 0.8,
            BLOOM_THRESHOLD: 0.6,
            BLOOM_SOFT_KNEE: 0.7
        };

function pointerPrototype() {
            this.id = -1;
            this.x = 0;
            this.y = 0;
            this.dx = 0;
            this.dy = 0;
            this.down = false;
            this.moved = false;
            this.color = [30, 0, 300];
        }

let pointers = [];
        let splatStack = [];
        let bloomFramebuffers = [];
        pointers.push(new pointerPrototype());

const { gl, ext } = getWebGLContext(canvas);

if (isMobile()) config.SHADING = false;
        if (!ext.supportLinearFiltering) {
            config.SHADING = false;
            config.BLOOM = false;
        }

//startGUI();

function getWebGLContext(canvas) {
            const params = {
                alpha: true,
                depth: false,
                stencil: false,
                antialias: false,
                preserveDrawingBuffer: false
            };

let gl = canvas.getContext("webgl2", params);
            const isWebGL2 = !!gl;
            if (!isWebGL2)
                gl =
                    canvas.getContext("webgl", params) ||
                    canvas.getContext("experimental-webgl", params);

let halfFloat;
            let supportLinearFiltering;
            if (isWebGL2) {
                gl.getExtension("EXT_color_buffer_float");
                supportLinearFiltering = gl.getExtension("OES_texture_float_linear");
            } else {
                halfFloat = gl.getExtension("OES_texture_half_float");
                supportLinearFiltering = gl.getExtension("OES_texture_half_float_linear");
            }

gl.clearColor(0.0, 0.0, 0.0, 1.0);

const halfFloatTexType = isWebGL2 ? gl.HALF_FLOAT : halfFloat.HALF_FLOAT_OES;
            let formatRGBA;
            let formatRG;
            let formatR;

if (isWebGL2) {
                formatRGBA = getSupportedFormat(gl, gl.RGBA16F, gl.RGBA, halfFloatTexType);
                formatRG = getSupportedFormat(gl, gl.RG16F, gl.RG, halfFloatTexType);
                formatR = getSupportedFormat(gl, gl.R16F, gl.RED, halfFloatTexType);
            } else {
                formatRGBA = getSupportedFormat(gl, gl.RGBA, gl.RGBA, halfFloatTexType);
                formatRG = getSupportedFormat(gl, gl.RGBA, gl.RGBA, halfFloatTexType);
                formatR = getSupportedFormat(gl, gl.RGBA, gl.RGBA, halfFloatTexType);
            }

if (formatRGBA == null)
                ga("send", "event", isWebGL2 ? "webgl2" : "webgl", "not supported");
            else ga("send", "event", isWebGL2 ? "webgl2" : "webgl", "supported");

return {
                gl,
                ext: {
                    formatRGBA,
                    formatRG,
                    formatR,
                    halfFloatTexType,
                    supportLinearFiltering
                }
            };
        }

function getSupportedFormat(gl, internalFormat, format, type) {
            if (!supportRenderTextureFormat(gl, internalFormat, format, type)) {
                switch (internalFormat) {
                    case gl.R16F:
                        return getSupportedFormat(gl, gl.RG16F, gl.RG, type);
                    case gl.RG16F:
                        return getSupportedFormat(gl, gl.RGBA16F, gl.RGBA, type);
                    default:
                        return null;
                }
            }

return {
                internalFormat,
                format
            };
        }

function supportRenderTextureFormat(gl, internalFormat, format, type) {
            let texture = gl.createTexture();
            gl.bindTexture(gl.TEXTURE_2D, texture);
            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
            gl.texImage2D(gl.TEXTURE_2D, 0, internalFormat, 4, 4, 0, format, type, null);

let fbo = gl.createFramebuffer();
            gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
            gl.framebufferTexture2D(
                gl.FRAMEBUFFER,
                gl.COLOR_ATTACHMENT0,
                gl.TEXTURE_2D,
                texture,
                0
            );

const status = gl.checkFramebufferStatus(gl.FRAMEBUFFER);
            if (status != gl.FRAMEBUFFER_COMPLETE) return false;
            return true;
        }

gui
                .add(
                    {
                        fun: () => {
                            splatStack.push(parseInt(Math.random() * 20) + 5);
                        }
                    },
                    "fun"
                )
                .name("Random splats");

let bloomFolder = gui.addFolder("Bloom");
            bloomFolder.add(config, "BLOOM").name("enabled");
            bloomFolder.add(config, "BLOOM_INTENSITY", 0.1, 2.0).name("intensity");
            bloomFolder.add(config, "BLOOM_THRESHOLD", 0.0, 1.0).name("threshold");

let captureFolder = gui.addFolder("Capture");
            captureFolder.addColor(config, "BACK_COLOR").name("background color");
            captureFolder.add(config, "TRANSPARENT").name("transparent");
            captureFolder
                .add(
                    {
                        fun: captureScreenshot
                    },
                    "fun"
                )
                .name("take screenshot");

if (isMobile()) gui.close();
        }

function captureScreenshot() {
            colorProgram.bind();
            gl.uniform4f(colorProgram.uniforms.color, 0, 0, 0, 1);
            blit(density.write.fbo);

render(density.write.fbo);
            gl.bindFramebuffer(gl.FRAMEBUFFER, density.write.fbo);

let length = dyeWidth * dyeHeight * 4;
            let pixels = new Float32Array(length);
            gl.readPixels(0, 0, dyeWidth, dyeHeight, gl.RGBA, gl.FLOAT, pixels);

let newPixels = new Uint8Array(length);

let id = 0;
            for (let i = dyeHeight - 1; i >= 0; i--) {
                for (let j = 0; j < dyeWidth; j++) {
                    let nid = i * dyeWidth * 4 + j * 4;
                    newPixels[nid + 0] = clamp01(pixels[id + 0]) * 255;
                    newPixels[nid + 1] = clamp01(pixels[id + 1]) * 255;
                    newPixels[nid + 2] = clamp01(pixels[id + 2]) * 255;
                    newPixels[nid + 3] = clamp01(pixels[id + 3]) * 255;
                    id += 4;
                }
            }

let captureCanvas = document.createElement("canvas");
            let ctx = captureCanvas.getContext("2d");
            captureCanvas.width = dyeWidth;
            captureCanvas.height = dyeHeight;

let imageData = ctx.createImageData(dyeWidth, dyeHeight);
            imageData.data.set(newPixels);
            ctx.putImageData(imageData, 0, 0);
            let datauri = captureCanvas.toDataURL();

downloadURI("fluid.png", datauri);

URL.revokeObjectURL(datauri);
        }

function clamp01(input) {
            return Math.min(Math.max(input, 0), 1);
        }

// function downloadURI(filename, uri) {
        //   let link = document.createElement("a");
        //   link.download = filename;
        //   link.href = uri;
        //   document.body.appendChild(link);
        //   link.click();
        //   document.body.removeChild(link);
        // }

function isMobile() {
            return /Mobi|Android/i.test(navigator.userAgent);
        }

class GLProgram {
            constructor(vertexShader, fragmentShader) {
                this.uniforms = {};
                this.program = gl.createProgram();

gl.attachShader(this.program, vertexShader);
                gl.attachShader(this.program, fragmentShader);
                gl.linkProgram(this.program);

if (!gl.getProgramParameter(this.program, gl.LINK_STATUS))
                    throw gl.getProgramInfoLog(this.program);

const uniformCount = gl.getProgramParameter(
                    this.program,
                    gl.ACTIVE_UNIFORMS
                );
                for (let i = 0; i < uniformCount; i++) {
                    const uniformName = gl.getActiveUniform(this.program, i).name;
                    this.uniforms[uniformName] = gl.getUniformLocation(
                        this.program,
                        uniformName
                    );
                }
            }

bind() {
                gl.useProgram(this.program);
            }
        }

function compileShader(type, source) {
            const shader = gl.createShader(type);
            gl.shaderSource(shader, source);
            gl.compileShader(shader);

if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS))
                throw gl.getShaderInfoLog(shader);

return shader;
        }

const baseVertexShader = compileShader(
            gl.VERTEX_SHADER,
            `
        precision highp float;
    
        attribute vec2 aPosition;
        varying vec2 vUv;
        varying vec2 vL;
        varying vec2 vR;
        varying vec2 vT;
        varying vec2 vB;
        uniform vec2 texelSize;
    
        void main () {
            vUv = aPosition * 0.5 + 0.5;
            vL = vUv - vec2(texelSize.x, 0.0);
            vR = vUv + vec2(texelSize.x, 0.0);
            vT = vUv + vec2(0.0, texelSize.y);
            vB = vUv - vec2(0.0, texelSize.y);
            gl_Position = vec4(aPosition, 0.0, 1.0);
        }
    `
        );

const clearShader = compileShader(
            gl.FRAGMENT_SHADER,
            `
        precision mediump float;
        precision mediump sampler2D;
    
        varying highp vec2 vUv;
        uniform sampler2D uTexture;
        uniform float value;
    
        void main () {
            gl_FragColor = value * texture2D(uTexture, vUv);
        }
    `
        );

const colorShader = compileShader(
            gl.FRAGMENT_SHADER,
            `
        precision mediump float;
    
        uniform vec4 color;
    
        void main () {
            gl_FragColor = color;
        }
    `
        );

const backgroundShader = compileShader(
            gl.FRAGMENT_SHADER,
            `
        precision highp float;
        precision highp sampler2D;
    
        varying vec2 vUv;
        uniform sampler2D uTexture;
        uniform float aspectRatio;
    
        #define SCALE 25.0
    
        void main () {
            vec2 uv = floor(vUv * SCALE * vec2(aspectRatio, 1.0));
            float v = mod(uv.x + uv.y, 2.0);
            v = v * 0.1 + 0.8;
            gl_FragColor = vec4(vec3(v), 1.0);
        }
    `
        );

const displayShader = compileShader(
            gl.FRAGMENT_SHADER,
            `
        precision highp float;
        precision highp sampler2D;
    
        varying vec2 vUv;
        uniform sampler2D uTexture;
    
        void main () {
            vec3 C = texture2D(uTexture, vUv).rgb;
            float a = max(C.r, max(C.g, C.b));
            gl_FragColor = vec4(C, a);
        }
    `
        );

const displayBloomShader = compileShader(
            gl.FRAGMENT_SHADER,
            `
        precision highp float;
        precision highp sampler2D;
    
        varying vec2 vUv;
        uniform sampler2D uTexture;
        uniform sampler2D uBloom;
        uniform sampler2D uDithering;
        uniform vec2 ditherScale;
    
        void main () {
            vec3 C = texture2D(uTexture, vUv).rgb;
            vec3 bloom = texture2D(uBloom, vUv).rgb;
            vec3 noise = texture2D(uDithering, vUv * ditherScale).rgb;
            noise = noise * 2.0 - 1.0;
            bloom += noise / 800.0;
            bloom = pow(bloom.rgb, vec3(1.0 / 2.2));
            C += bloom;
            float a = max(C.r, max(C.g, C.b));
            gl_FragColor = vec4(C, a);
        }
    `
        );

const displayShadingShader = compileShader(
            gl.FRAGMENT_SHADER,
            `
        precision highp float;
        precision highp sampler2D;
    
        varying vec2 vUv;
        varying vec2 vL;
        varying vec2 vR;
        varying vec2 vT;
        varying vec2 vB;
        uniform sampler2D uTexture;
        uniform vec2 texelSize;
    
        void main () {
            vec3 L = texture2D(uTexture, vL).rgb;
            vec3 R = texture2D(uTexture, vR).rgb;
            vec3 T = texture2D(uTexture, vT).rgb;
            vec3 B = texture2D(uTexture, vB).rgb;
            vec3 C = texture2D(uTexture, vUv).rgb;
    
            float dx = length(R) - length(L);
            float dy = length(T) - length(B);
    
            vec3 n = normalize(vec3(dx, dy, length(texelSize)));
            vec3 l = vec3(0.0, 0.0, 1.0);
    
            float diffuse = clamp(dot(n, l) + 0.7, 0.7, 1.0);
            C.rgb *= diffuse;
    
            float a = max(C.r, max(C.g, C.b));
            gl_FragColor = vec4(C, a);
        }
    `
        );

const displayBloomShadingShader = compileShader(
            gl.FRAGMENT_SHADER,
            `
        precision highp float;
        precision highp sampler2D;
    
        varying vec2 vUv;
        varying vec2 vL;
        varying vec2 vR;
        varying vec2 vT;
        varying vec2 vB;
        uniform sampler2D uTexture;
        uniform sampler2D uBloom;
        uniform sampler2D uDithering;
        uniform vec2 ditherScale;
        uniform vec2 texelSize;
    
        void main () {
            vec3 L = texture2D(uTexture, vL).rgb;
            vec3 R = texture2D(uTexture, vR).rgb;
            vec3 T = texture2D(uTexture, vT).rgb;
            vec3 B = texture2D(uTexture, vB).rgb;
            vec3 C = texture2D(uTexture, vUv).rgb;
    
            float dx = length(R) - length(L);
            float dy = length(T) - length(B);
    
            vec3 n = normalize(vec3(dx, dy, length(texelSize)));
            vec3 l = vec3(0.0, 0.0, 1.0);
    
            float diffuse = clamp(dot(n, l) + 0.7, 0.7, 1.0);
            C *= diffuse;
    
            vec3 bloom = texture2D(uBloom, vUv).rgb;
            vec3 noise = texture2D(uDithering, vUv * ditherScale).rgb;
            noise = noise * 2.0 - 1.0;
            bloom += noise / 800.0;
            bloom = pow(bloom.rgb, vec3(1.0 / 2.2));
            C += bloom;
    
            float a = max(C.r, max(C.g, C.b));
            gl_FragColor = vec4(C, a);
        }
    `
        );

const bloomPrefilterShader = compileShader(
            gl.FRAGMENT_SHADER,
            `
        precision mediump float;
        precision mediump sampler2D;
    
        varying vec2 vUv;
        uniform sampler2D uTexture;
        uniform vec3 curve;
        uniform float threshold;
    
        void main () {
            vec3 c = texture2D(uTexture, vUv).rgb;
            float br = max(c.r, max(c.g, c.b));
            float rq = clamp(br - curve.x, 0.0, curve.y);
            rq = curve.z * rq * rq;
            c *= max(rq, br - threshold) / max(br, 0.0001);
            gl_FragColor = vec4(c, 0.0);
        }
    `
        );

const bloomBlurShader = compileShader(
            gl.FRAGMENT_SHADER,
            `
        precision mediump float;
        precision mediump sampler2D;
    
        varying vec2 vL;
        varying vec2 vR;
        varying vec2 vT;
        varying vec2 vB;
        uniform sampler2D uTexture;
    
        void main () {
            vec4 sum = vec4(0.0);
            sum += texture2D(uTexture, vL);
            sum += texture2D(uTexture, vR);
            sum += texture2D(uTexture, vT);
            sum += texture2D(uTexture, vB);
            sum *= 0.25;
            gl_FragColor = sum;
        }
    `
        );

const bloomFinalShader = compileShader(
            gl.FRAGMENT_SHADER,
            `
        precision mediump float;
        precision mediump sampler2D;
    
        varying vec2 vL;
        varying vec2 vR;
        varying vec2 vT;
        varying vec2 vB;
        uniform sampler2D uTexture;
        uniform float intensity;
    
        void main () {
            vec4 sum = vec4(0.0);
            sum += texture2D(uTexture, vL);
            sum += texture2D(uTexture, vR);
            sum += texture2D(uTexture, vT);
            sum += texture2D(uTexture, vB);
            sum *= 0.25;
            gl_FragColor = sum * intensity;
        }
    `
        );

const splatShader = compileShader(
            gl.FRAGMENT_SHADER,
            `
        precision highp float;
        precision highp sampler2D;
    
        varying vec2 vUv;
        uniform sampler2D uTarget;
        uniform float aspectRatio;
        uniform vec3 color;
        uniform vec2 point;
        uniform float radius;
    
        void main () {
            vec2 p = vUv - point.xy;
            p.x *= aspectRatio;
            vec3 splat = exp(-dot(p, p) / radius) * color;
            vec3 base = texture2D(uTarget, vUv).xyz;
            gl_FragColor = vec4(base + splat, 1.0);
        }
    `
        );

const advectionManualFilteringShader = compileShader(
            gl.FRAGMENT_SHADER,
            `
        precision highp float;
        precision highp sampler2D;
    
        varying vec2 vUv;
        uniform sampler2D uVelocity;
        uniform sampler2D uSource;
        uniform vec2 texelSize;
        uniform vec2 dyeTexelSize;
        uniform float dt;
        uniform float dissipation;
    
        vec4 bilerp (sampler2D sam, vec2 uv, vec2 tsize) {
            vec2 st = uv / tsize - 0.5;
    
            vec2 iuv = floor(st);
            vec2 fuv = fract(st);
    
            vec4 a = texture2D(sam, (iuv + vec2(0.5, 0.5)) * tsize);
            vec4 b = texture2D(sam, (iuv + vec2(1.5, 0.5)) * tsize);
            vec4 c = texture2D(sam, (iuv + vec2(0.5, 1.5)) * tsize);
            vec4 d = texture2D(sam, (iuv + vec2(1.5, 1.5)) * tsize);
    
            return mix(mix(a, b, fuv.x), mix(c, d, fuv.x), fuv.y);
        }
    
        void main () {
            vec2 coord = vUv - dt * bilerp(uVelocity, vUv, texelSize).xy * texelSize;
            gl_FragColor = dissipation * bilerp(uSource, coord, dyeTexelSize);
            gl_FragColor.a = 1.0;
        }
    `
        );

const advectionShader = compileShader(
            gl.FRAGMENT_SHADER,
            `
        precision highp float;
        precision highp sampler2D;
    
        varying vec2 vUv;
        uniform sampler2D uVelocity;
        uniform sampler2D uSource;
        uniform vec2 texelSize;
        uniform float dt;
        uniform float dissipation;
    
        void main () {
            vec2 coord = vUv - dt * texture2D(uVelocity, vUv).xy * texelSize;
            gl_FragColor = dissipation * texture2D(uSource, coord);
            gl_FragColor.a = 1.0;
        }
    `
        );

const curlShader = compileShader(
            gl.FRAGMENT_SHADER,
            `
        precision mediump float;
        precision mediump sampler2D;
    
        varying highp vec2 vUv;
        varying highp vec2 vL;
        varying highp vec2 vR;
        varying highp vec2 vT;
        varying highp vec2 vB;
        uniform sampler2D uVelocity;
    
        void main () {
            float L = texture2D(uVelocity, vL).y;
            float R = texture2D(uVelocity, vR).y;
            float T = texture2D(uVelocity, vT).x;
            float B = texture2D(uVelocity, vB).x;
            float vorticity = R - L - T + B;
            gl_FragColor = vec4(0.5 * vorticity, 0.0, 0.0, 1.0);
        }
    `
        );

const vorticityShader = compileShader(
            gl.FRAGMENT_SHADER,
            `
        precision highp float;
        precision highp sampler2D;
    
        varying vec2 vUv;
        varying vec2 vL;
        varying vec2 vR;
        varying vec2 vT;
        varying vec2 vB;
        uniform sampler2D uVelocity;
        uniform sampler2D uCurl;
        uniform float curl;
        uniform float dt;
    
        void main () {
            float L = texture2D(uCurl, vL).x;
            float R = texture2D(uCurl, vR).x;
            float T = texture2D(uCurl, vT).x;
            float B = texture2D(uCurl, vB).x;
            float C = texture2D(uCurl, vUv).x;
    
            vec2 force = 0.5 * vec2(abs(T) - abs(B), abs(R) - abs(L));
            force /= length(force) + 0.0001;
            force *= curl * C;
            force.y *= -1.0;
    
            vec2 vel = texture2D(uVelocity, vUv).xy;
            gl_FragColor = vec4(vel + force * dt, 0.0, 1.0);
        }
    `
        );

const pressureShader = compileShader(
            gl.FRAGMENT_SHADER,
            `
        precision mediump float;
        precision mediump sampler2D;
    
        varying highp vec2 vUv;
        varying highp vec2 vL;
        varying highp vec2 vR;
        varying highp vec2 vT;
        varying highp vec2 vB;
        uniform sampler2D uPressure;
        uniform sampler2D uDivergence;
    
        vec2 boundary (vec2 uv) {
            return uv;
            // uncomment if you use wrap or repeat texture mode
            // uv = min(max(uv, 0.0), 1.0);
            // return uv;
        }
    
        void main () {
            float L = texture2D(uPressure, boundary(vL)).x;
            float R = texture2D(uPressure, boundary(vR)).x;
            float T = texture2D(uPressure, boundary(vT)).x;
            float B = texture2D(uPressure, boundary(vB)).x;
            float C = texture2D(uPressure, vUv).x;
            float divergence = texture2D(uDivergence, vUv).x;
            float pressure = (L + R + B + T - divergence) * 0.25;
            gl_FragColor = vec4(pressure, 0.0, 0.0, 1.0);
        }
    `
        );

const gradientSubtractShader = compileShader(
            gl.FRAGMENT_SHADER,
            `
        precision mediump float;
        precision mediump sampler2D;
    
        varying highp vec2 vUv;
        varying highp vec2 vL;
        varying highp vec2 vR;
        varying highp vec2 vT;
        varying highp vec2 vB;
        uniform sampler2D uPressure;
        uniform sampler2D uVelocity;
    
        vec2 boundary (vec2 uv) {
            return uv;
            // uv = min(max(uv, 0.0), 1.0);
            // return uv;
        }
    
        void main () {
            float L = texture2D(uPressure, boundary(vL)).x;
            float R = texture2D(uPressure, boundary(vR)).x;
            float T = texture2D(uPressure, boundary(vT)).x;
            float B = texture2D(uPressure, boundary(vB)).x;
            vec2 velocity = texture2D(uVelocity, vUv).xy;
            velocity.xy -= vec2(R - L, T - B);
            gl_FragColor = vec4(velocity, 0.0, 1.0);
        }
    `
        );

const blit = (() => {
            gl.bindBuffer(gl.ARRAY_BUFFER, gl.createBuffer());
            gl.bufferData(
                gl.ARRAY_BUFFER,
                new Float32Array([-1, -1, -1, 1, 1, 1, 1, -1]),
                gl.STATIC_DRAW
            );
            gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, gl.createBuffer());
            gl.bufferData(
                gl.ELEMENT_ARRAY_BUFFER,
                new Uint16Array([0, 1, 2, 0, 2, 3]),
                gl.STATIC_DRAW
            );
            gl.vertexAttribPointer(0, 2, gl.FLOAT, false, 0, 0);
            gl.enableVertexAttribArray(0);

return (destination) => {
                gl.bindFramebuffer(gl.FRAMEBUFFER, destination);
                gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_SHORT, 0);
            };
        })();

let simWidth;
        let simHeight;
        let dyeWidth;
        let dyeHeight;
        let density;
        let velocity;
        let divergence;
        let curl;
        let pressure;
        let bloom;

// let ditheringTexture = createTextureAsync("LDR_RGB1_0.png");

const clearProgram = new GLProgram(baseVertexShader, clearShader);
        const colorProgram = new GLProgram(baseVertexShader, colorShader);
        const backgroundProgram = new GLProgram(baseVertexShader, backgroundShader);
        const displayProgram = new GLProgram(baseVertexShader, displayShader);
        const displayBloomProgram = new GLProgram(baseVertexShader, displayBloomShader);
        const displayShadingProgram = new GLProgram(
            baseVertexShader,
            displayShadingShader
        );
        const displayBloomShadingProgram = new GLProgram(
            baseVertexShader,
            displayBloomShadingShader
        );
        const bloomPrefilterProgram = new GLProgram(
            baseVertexShader,
            bloomPrefilterShader
        );
        const bloomBlurProgram = new GLProgram(baseVertexShader, bloomBlurShader);
        const bloomFinalProgram = new GLProgram(baseVertexShader, bloomFinalShader);
        const splatProgram = new GLProgram(baseVertexShader, splatShader);
        const advectionProgram = new GLProgram(
            baseVertexShader,
            ext.supportLinearFiltering ? advectionShader : advectionManualFilteringShader
        );
        const divergenceProgram = new GLProgram(baseVertexShader, divergenceShader);
        const curlProgram = new GLProgram(baseVertexShader, curlShader);
        const vorticityProgram = new GLProgram(baseVertexShader, vorticityShader);
        const pressureProgram = new GLProgram(baseVertexShader, pressureShader);
        const gradienSubtractProgram = new GLProgram(
            baseVertexShader,
            gradientSubtractShader
        );

function initFramebuffers() {
            let simRes = getResolution(config.SIM_RESOLUTION);
            let dyeRes = getResolution(config.DYE_RESOLUTION);

simWidth = simRes.width;
            simHeight = simRes.height;
            dyeWidth = dyeRes.width;
            dyeHeight = dyeRes.height;

const texType = ext.halfFloatTexType;
            const rgba = ext.formatRGBA;
            const rg = ext.formatRG;
            const r = ext.formatR;
            const filtering = ext.supportLinearFiltering ? gl.LINEAR : gl.NEAREST;

if (density == null)
                density = createDoubleFBO(
                    dyeWidth,
                    dyeHeight,
                    rgba.internalFormat,
                    rgba.format,
                    texType,
                    filtering
                );
            else
                density = resizeDoubleFBO(
                    density,
                    dyeWidth,
                    dyeHeight,
                    rgba.internalFormat,
                    rgba.format,
                    texType,
                    filtering
                );

if (velocity == null)
                velocity = createDoubleFBO(
                    simWidth,
                    simHeight,
                    rg.internalFormat,
                    rg.format,
                    texType,
                    filtering
                );
            else
                velocity = resizeDoubleFBO(
                    velocity,
                    simWidth,
                    simHeight,
                    rg.internalFormat,
                    rg.format,
                    texType,
                    filtering
                );

divergence = createFBO(
                simWidth,
                simHeight,
                r.internalFormat,
                r.format,
                texType,
                gl.NEAREST
            );
            curl = createFBO(
                simWidth,
                simHeight,
                r.internalFormat,
                r.format,
                texType,
                gl.NEAREST
            );
            pressure = createDoubleFBO(
                simWidth,
                simHeight,
                r.internalFormat,
                r.format,
                texType,
                gl.NEAREST
            );

initBloomFramebuffers();
        }

function initBloomFramebuffers() {
            let res = getResolution(config.BLOOM_RESOLUTION);

const texType = ext.halfFloatTexType;
            const rgba = ext.formatRGBA;
            const filtering = ext.supportLinearFiltering ? gl.LINEAR : gl.NEAREST;

bloom = createFBO(
                res.width,
                res.height,
                rgba.internalFormat,
                rgba.format,
                texType,
                filtering
            );

bloomFramebuffers.length = 0;
            for (let i = 0; i < config.BLOOM_ITERATIONS; i++) {
                let width = res.width >> (i + 1);
                let height = res.height >> (i + 1);

if (width < 2 || height < 2) break;

let fbo = createFBO(
                    width,
                    height,
                    rgba.internalFormat,
                    rgba.format,
                    texType,
                    filtering
                );
                bloomFramebuffers.push(fbo);
            }
        }

function createFBO(w, h, internalFormat, format, type, param) {
            gl.activeTexture(gl.TEXTURE0);
            let texture = gl.createTexture();
            gl.bindTexture(gl.TEXTURE_2D, texture);
            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, param);
            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, param);
            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
            gl.texImage2D(gl.TEXTURE_2D, 0, internalFormat, w, h, 0, format, type, null);

return {
                texture,
                fbo,
                width: w,
                height: h,
                attach(id) {
                    gl.activeTexture(gl.TEXTURE0 + id);
                    gl.bindTexture(gl.TEXTURE_2D, texture);
                    return id;
                }
            };
        }

function createDoubleFBO(w, h, internalFormat, format, type, param) {
            let fbo1 = createFBO(w, h, internalFormat, format, type, param);
            let fbo2 = createFBO(w, h, internalFormat, format, type, param);

return {
                get read() {
                    return fbo1;
                },
                set read(value) {
                    fbo1 = value;
                },
                get write() {
                    return fbo2;
                },
                set write(value) {
                    fbo2 = value;
                },
                swap() {
                    let temp = fbo1;
                    fbo1 = fbo2;
                    fbo2 = temp;
                }
            };
        }

function resizeFBO(target, w, h, internalFormat, format, type, param) {
            let newFBO = createFBO(w, h, internalFormat, format, type, param);
            clearProgram.bind();
            gl.uniform1i(clearProgram.uniforms.uTexture, target.attach(0));
            gl.uniform1f(clearProgram.uniforms.value, 1);
            blit(newFBO.fbo);
            return newFBO;
        }

function resizeDoubleFBO(target, w, h, internalFormat, format, type, param) {
            target.read = resizeFBO(
                target.read,
                w,
                h,
                internalFormat,
                format,
                type,
                param
            );
            target.write = createFBO(w, h, internalFormat, format, type, param);
            return target;
        }

function createTextureAsync(url) {
            let texture = gl.createTexture();
            gl.bindTexture(gl.TEXTURE_2D, texture);
            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT);
            gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT);
            gl.texImage2D(
                gl.TEXTURE_2D,
                0,
                gl.RGB,
                1,
                1,
                0,
                gl.RGB,
                gl.UNSIGNED_BYTE,
                new Uint8Array([255, 255, 255])
            );

let obj = {
                texture,
                width: 1,
                height: 1,
                attach(id) {
                    gl.activeTexture(gl.TEXTURE0 + id);
                    gl.bindTexture(gl.TEXTURE_2D, texture);
                    return id;
                }
            };

let image = new Image();
            image.onload = () => {
                obj.width = image.width;
                obj.height = image.height;
                gl.bindTexture(gl.TEXTURE_2D, texture);
                gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGB, gl.RGB, gl.UNSIGNED_BYTE, image);
            };
            image.src = url;

return obj;
        }

initFramebuffers();
        multipleSplats(parseInt(Math.random() * 20) + 5);

let lastColorChangeTime = Date.now();

update();

function update() {
            resizeCanvas();
            input();
            if (!config.PAUSED) step(0.016);
            render(null);
            requestAnimationFrame(update);
        }

function input() {
            if (splatStack.length > 0) multipleSplats(splatStack.pop());

for (let i = 0; i < pointers.length; i++) {
                const p = pointers[i];
                if (p.moved) {
                    splat(p.x, p.y, p.dx, p.dy, p.color);
                    p.moved = false;
                }
            }

if (!config.COLORFUL) return;

if (lastColorChangeTime + 100 < Date.now()) {
                lastColorChangeTime = Date.now();
                for (let i = 0; i < pointers.length; i++) {
                    const p = pointers[i];
                    p.color = generateColor();
                }
            }
        }

function step(dt) {
            gl.disable(gl.BLEND);
            gl.viewport(0, 0, simWidth, simHeight);

curlProgram.bind();
            gl.uniform2f(curlProgram.uniforms.texelSize, 1.0 / simWidth, 1.0 / simHeight);
            gl.uniform1i(curlProgram.uniforms.uVelocity, velocity.read.attach(0));
            blit(curl.fbo);

vorticityProgram.bind();
            gl.uniform2f(
                vorticityProgram.uniforms.texelSize,
                1.0 / simWidth,
                1.0 / simHeight
            );
            gl.uniform1i(vorticityProgram.uniforms.uVelocity, velocity.read.attach(0));
            gl.uniform1i(vorticityProgram.uniforms.uCurl, curl.attach(1));
            gl.uniform1f(vorticityProgram.uniforms.curl, config.CURL);
            gl.uniform1f(vorticityProgram.uniforms.dt, dt);
            blit(velocity.write.fbo);
            velocity.swap();

divergenceProgram.bind();
            gl.uniform2f(
                divergenceProgram.uniforms.texelSize,
                1.0 / simWidth,
                1.0 / simHeight
            );
            gl.uniform1i(divergenceProgram.uniforms.uVelocity, velocity.read.attach(0));
            blit(divergence.fbo);

clearProgram.bind();
            gl.uniform1i(clearProgram.uniforms.uTexture, pressure.read.attach(0));
            gl.uniform1f(clearProgram.uniforms.value, config.PRESSURE_DISSIPATION);
            blit(pressure.write.fbo);
            pressure.swap();

pressureProgram.bind();
            gl.uniform2f(
                pressureProgram.uniforms.texelSize,
                1.0 / simWidth,
                1.0 / simHeight
            );
            gl.uniform1i(pressureProgram.uniforms.uDivergence, divergence.attach(0));
            for (let i = 0; i < config.PRESSURE_ITERATIONS; i++) {
                gl.uniform1i(pressureProgram.uniforms.uPressure, pressure.read.attach(1));
                blit(pressure.write.fbo);
                pressure.swap();
            }

gradienSubtractProgram.bind();
            gl.uniform2f(
                gradienSubtractProgram.uniforms.texelSize,
                1.0 / simWidth,
                1.0 / simHeight
            );
            gl.uniform1i(
                gradienSubtractProgram.uniforms.uPressure,
                pressure.read.attach(0)
            );
            gl.uniform1i(
                gradienSubtractProgram.uniforms.uVelocity,
                velocity.read.attach(1)
            );
            blit(velocity.write.fbo);
            velocity.swap();

advectionProgram.bind();
            gl.uniform2f(
                advectionProgram.uniforms.texelSize,
                1.0 / simWidth,
                1.0 / simHeight
            );
            if (!ext.supportLinearFiltering)
                gl.uniform2f(
                    advectionProgram.uniforms.dyeTexelSize,
                    1.0 / simWidth,
                    1.0 / simHeight
                );
            let velocityId = velocity.read.attach(0);
            gl.uniform1i(advectionProgram.uniforms.uVelocity, velocityId);
            gl.uniform1i(advectionProgram.uniforms.uSource, velocityId);
            gl.uniform1f(advectionProgram.uniforms.dt, dt);
            gl.uniform1f(
                advectionProgram.uniforms.dissipation,
                config.VELOCITY_DISSIPATION
            );
            blit(velocity.write.fbo);
            velocity.swap();

gl.viewport(0, 0, dyeWidth, dyeHeight);

if (!ext.supportLinearFiltering)
                gl.uniform2f(
                    advectionProgram.uniforms.dyeTexelSize,
                    1.0 / dyeWidth,
                    1.0 / dyeHeight
                );
            gl.uniform1i(advectionProgram.uniforms.uVelocity, velocity.read.attach(0));
            gl.uniform1i(advectionProgram.uniforms.uSource, density.read.attach(1));
            gl.uniform1f(
                advectionProgram.uniforms.dissipation,
                config.DENSITY_DISSIPATION
            );
            blit(density.write.fbo);
            density.swap();
        }

function render(target) {
            if (config.BLOOM) applyBloom(density.read, bloom);

if (target == null || !config.TRANSPARENT) {
                gl.blendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA);
                gl.enable(gl.BLEND);
            } else {
                gl.disable(gl.BLEND);
            }

let width = target == null ? gl.drawingBufferWidth : dyeWidth;
            let height = target == null ? gl.drawingBufferHeight : dyeHeight;

gl.viewport(0, 0, width, height);

if (!config.TRANSPARENT) {
                colorProgram.bind();
                let bc = config.BACK_COLOR;
                gl.uniform4f(
                    colorProgram.uniforms.color,
                    bc.r / 255,
                    bc.g / 255,
                    bc.b / 255,
                    1
                );
                blit(target);
            }

if (target == null && config.TRANSPARENT) {
                backgroundProgram.bind();
                gl.uniform1f(
                    backgroundProgram.uniforms.aspectRatio,
                    canvas.width / canvas.height
                );
                blit(null);
            }

if (config.SHADING) {
                let program = config.BLOOM
                    ? displayBloomShadingProgram
                    : displayShadingProgram;
                program.bind();
                gl.uniform2f(program.uniforms.texelSize, 1.0 / width, 1.0 / height);
                gl.uniform1i(program.uniforms.uTexture, density.read.attach(0));
                if (config.BLOOM) {
                    gl.uniform1i(program.uniforms.uBloom, bloom.attach(1));
                    //   gl.uniform1i(program.uniforms.uDithering, ditheringTexture.attach(2));
                    //   let scale = getTextureScale(ditheringTexture, width, height);
                    gl.uniform2f(program.uniforms.ditherScale, scale.x, scale.y);
                }
            } else {
                let program = config.BLOOM ? displayBloomProgram : displayProgram;
                program.bind();
                gl.uniform1i(program.uniforms.uTexture, density.read.attach(0));
                if (config.BLOOM) {
                    gl.uniform1i(program.uniforms.uBloom, bloom.attach(1));
                    //   gl.uniform1i(program.uniforms.uDithering, ditheringTexture.attach(2));
                    //   let scale = getTextureScale(ditheringTexture, width, height);
                    gl.uniform2f(program.uniforms.ditherScale, scale.x, scale.y);
                }
            }

blit(target);
        }

function applyBloom(source, destination) {
            if (bloomFramebuffers.length < 2) return;

let last = destination;

gl.disable(gl.BLEND);
            bloomPrefilterProgram.bind();
            let knee = config.BLOOM_THRESHOLD * config.BLOOM_SOFT_KNEE + 0.0001;
            let curve0 = config.BLOOM_THRESHOLD - knee;
            let curve1 = knee * 2;
            let curve2 = 0.25 / knee;
            gl.uniform3f(bloomPrefilterProgram.uniforms.curve, curve0, curve1, curve2);
            gl.uniform1f(
                bloomPrefilterProgram.uniforms.threshold,
                config.BLOOM_THRESHOLD
            );
            gl.uniform1i(bloomPrefilterProgram.uniforms.uTexture, source.attach(0));
            gl.viewport(0, 0, last.width, last.height);
            blit(last.fbo);

bloomBlurProgram.bind();
            for (let i = 0; i < bloomFramebuffers.length; i++) {
                let dest = bloomFramebuffers[i];
                gl.uniform2f(
                    bloomBlurProgram.uniforms.texelSize,
                    1.0 / last.width,
                    1.0 / last.height
                );
                gl.uniform1i(bloomBlurProgram.uniforms.uTexture, last.attach(0));
                gl.viewport(0, 0, dest.width, dest.height);
                blit(dest.fbo);
                last = dest;
            }

gl.blendFunc(gl.ONE, gl.ONE);
            gl.enable(gl.BLEND);

for (let i = bloomFramebuffers.length - 2; i >= 0; i--) {
                let baseTex = bloomFramebuffers[i];
                gl.uniform2f(
                    bloomBlurProgram.uniforms.texelSize,
                    1.0 / last.width,
                    1.0 / last.height
                );
                gl.uniform1i(bloomBlurProgram.uniforms.uTexture, last.attach(0));
                gl.viewport(0, 0, baseTex.width, baseTex.height);
                blit(baseTex.fbo);
                last = baseTex;
            }

gl.disable(gl.BLEND);
            bloomFinalProgram.bind();
            gl.uniform2f(
                bloomFinalProgram.uniforms.texelSize,
                1.0 / last.width,
                1.0 / last.height
            );
            gl.uniform1i(bloomFinalProgram.uniforms.uTexture, last.attach(0));
            gl.uniform1f(bloomFinalProgram.uniforms.intensity, config.BLOOM_INTENSITY);
            gl.viewport(0, 0, destination.width, destination.height);
            blit(destination.fbo);
        }

function splat(x, y, dx, dy, color) {
            gl.viewport(0, 0, simWidth, simHeight);
            splatProgram.bind();
            gl.uniform1i(splatProgram.uniforms.uTarget, velocity.read.attach(0));
            gl.uniform1f(splatProgram.uniforms.aspectRatio, canvas.width / canvas.height);
            gl.uniform2f(
                splatProgram.uniforms.point,
                x / canvas.width,
                1.0 - y / canvas.height
            );
            gl.uniform3f(splatProgram.uniforms.color, dx, -dy, 1.0);
            gl.uniform1f(splatProgram.uniforms.radius, config.SPLAT_RADIUS / 100.0);
            blit(velocity.write.fbo);
            velocity.swap();

gl.viewport(0, 0, dyeWidth, dyeHeight);
            gl.uniform1i(splatProgram.uniforms.uTarget, density.read.attach(0));
            gl.uniform3f(splatProgram.uniforms.color, color.r, color.g, color.b);
            blit(density.write.fbo);
            density.swap();
        }

function multipleSplats(amount) {
            for (let i = 0; i < amount; i++) {
                const color = generateColor();
                color.r *= 10.0;
                color.g *= 10.0;
                color.b *= 10.0;
                const x = canvas.width * Math.random();
                const y = canvas.height * Math.random();
                const dx = 1000 * (Math.random() - 0.5);
                const dy = 1000 * (Math.random() - 0.5);
                splat(x, y, dx, dy, color);
            }
        }

function resizeCanvas() {
            if (
                canvas.width != canvas.clientWidth ||
                canvas.height != canvas.clientHeight
            ) {
                canvas.width = canvas.clientWidth;
                canvas.height = canvas.clientHeight;
                initFramebuffers();
            }
        }

document.body.addEventListener("mousemove", (e) => {
            pointers[0].moved = pointers[0].down;
            pointers[0].dx = (e.clientX - pointers[0].x) * 5.0;
            pointers[0].dy = (e.clientY - pointers[0].y) * 5.0;
            pointers[0].x = e.clientX;
            pointers[0].y = e.clientY;
        });

document.body.addEventListener("mousemove", () => {
            pointers[0].down = true;
            pointers[0].color = generateColor();
        });

function generateColor() {
            // Return light gray color (#ccc)
            if(brightness == 'dark'){
                return { r: 204 / 255, g: 204 / 255, b: 204 / 255 };
            } else {
                return { r: 1, g: 0, b: 0 };
            }
        }

function HSVtoRGB(h, s, v) {
            let r, g, b, i, f, p, q, t;
            i = Math.floor(h * 6);
            f = h * 6 - i;
            p = v * (1 - s);
            q = v * (1 - f * s);
            t = v * (1 - (1 - f) * s);

switch (i % 6) {
                case 0:
                    (r = v), (g = t), (b = p);
                    break;
                case 1:
                    (r = q), (g = v), (b = p);
                    break;
                case 2:
                    (r = p), (g = v), (b = t);
                    break;
                case 3:
                    (r = p), (g = q), (b = v);
                    break;
                case 4:
                    (r = t), (g = p), (b = v);
                    break;
                case 5:
                    (r = v), (g = p), (b = q);
                    break;
            }

return {
                r,
                g,
                b
            };
        }

function getResolution(resolution) {
            let aspectRatio = gl.drawingBufferWidth / gl.drawingBufferHeight;
            if (aspectRatio < 1) aspectRatio = 1.0 / aspectRatio;

let max = Math.round(resolution * aspectRatio);
            let min = Math.round(resolution);

if (gl.drawingBufferWidth > gl.drawingBufferHeight)
                return {
                    width: max,
                    height: min
                };
            else
                return {
                    width: min,
                    height: max
                };
        }

function getTextureScale(texture, width, height) {
            return {
                x: width / texture.width,
                y: height / texture.height
            };
        }

});
})(jQuery);

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