webgl实现多彩烟雾流动动画效果代码-html代码-BFW代码库

代码语言：html
所属分类：粒子
代码描述：webgl实现多彩烟雾流动动画效果代码
下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开
<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/dat.gui-min.js"></script>
        <style>
            @font-face {
                font-family: 'iconfont';
                src: url('iconfont.ttf') format('truetype');
            }

            * {
                user-select: none;
            }

            html, body {
                overflow: hidden;
                background-color: #000;
            }

            body {
                margin: 0;
                position: fixed;
                width: 100%;
                height: 100%;
            }

            canvas {
                width: 100%;
                height: 100%;
            }

            .dg {
                opacity: 0.9;
            }

            .dg .property-name {
                overflow: visible;
            }

            .bigFont {
                font-size: 150%;
                color: #8C8C8C;
            }

            .cr.function.appBigFont {
                font-size: 150%;
                line-height: 27px;
                color: #A5F8D3;
                background-color: #023C40;
            }

            .cr.function.appBigFont .property-name {
                float: none;
            }

            .cr.function.appBigFont .icon {
                position: sticky;
                bottom: 27px;
            }

            .icon {
                font-family: 'iconfont';
                font-size: 130%;
                float: right;
            }

            .twitter:before {
                content: 'a';
            }

            .github:before {
                content: 'b';
            }

            .app:before {
                content: 'c';
            }

            .discord:before {
                content: 'd';
            }

            .promo {
                display: none;
                /* display: table; */
                position: absolute;
                top: 0;
                left: 0;
                width: 100%;
                height: 100%;
                z-index: 1;
                overflow: auto;
                color: lightblue;
                background-color: rgba(0,0,0,0.4);
                animation: promo-appear-animation 0.35s ease-out;
            }

            .promo-middle {
                display: table-cell;
                vertical-align: middle;
            }

            .promo-content {
                width: 80vw;
                height: 80vh;
                max-width: 80vh;
                max-height: 80vw;
                margin: auto;
                padding: 0;
                font-size: 2.8vmax;
                font-family: Futura, "Trebuchet MS", Arial, sans-serif;
                text-align: center;
                background-image: url("promo_back.png");
                background-position: center;
                background-repeat: no-repeat;
                background-size: cover;
                border-radius: 15px;
                box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2), 0 6px 20px 0 rgba(0,0,0,0.19);
            }

            .promo-header {
                height: 10%;
                padding: 2px 16px;
            }

            .promo-close {
                width: 10%;
                height: 100%;
                text-align: left;
                float: left;
                font-size: 1.3em;
                /* transition: 0.2s; */
            }

            .promo-close:hover {
                /* transform: scale(1.25); */
                cursor: pointer;
            }

            .promo-body {
                padding: 8px 16px 16px 16px;
                margin: auto;
            }

            .promo-body p {
                margin-top: 0;
                mix-blend-mode: color-dodge;
            }

            .link {
                width: 100%;
                display: inline-block;
            }

            .link img {
                width: 100%;
            }

            @keyframes promo-appear-animation {
                0% {
                    transform: scale(2.0);
                    opacity: 0;
                }
                100% {
                    transform: scale(1.0);
                    opacity: 1;
                }
            }
        </style>
        <script>
            window.ga=window.ga||function(){(ga.q=ga.q||[]).push(arguments)};ga.l=+new Date;

        </script>

    </head>
    <body>
        <canvas></canvas>

        <!-- Mother of God, pls forgive me -->
        <div class="promo">
            <div class="promo-middle">
                <div class="promo-content">
                    <div class="promo-header">
                        <span class="promo-close">&times;</span>
                    </div>
                    <div class="promo-body">
                        <p>Try Fluid Simulation app!</p>
                        <div class="links-container">
                            <a class="link" id="apple_link" target="_blank">
                                <img class="link-img" alt="Download on the App Store" src="app_badge.png"/>
                            </a>
                            <a class="link" id="google_link" target="_blank">
                                <img class="link-img" alt="Get it on Google Play" src="gp_badge.png"/>
                            </a>
                        </div>
                    </div>
                </div>
            </div>
        </div>

        <script>
            /*
MIT License

Copyright (c) 2017 Pavel Dobryakov

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

'use strict';

// Mobile promo section

// Simulation section

const canvas = document.getElementsByTagName('canvas')[0];
resizeCanvas();

let config = {
    SIM_RESOLUTION: 128,
    DYE_RESOLUTION: 1024,
    CAPTURE_RESOLUTION: 512,
    DENSITY_DISSIPATION: 1,
    VELOCITY_DISSIPATION: 0.2,
    PRESSURE: 0.8,
    PRESSURE_ITERATIONS: 20,
    CURL: 30,
    SPLAT_RADIUS: 0.25,
    SPLAT_FORCE: 6000,
    SHADING: true,
    COLORFUL: true,
    COLOR_UPDATE_SPEED: 10,
    PAUSED: false,
    BACK_COLOR: { r: 0, g: 0, b: 0 },
    TRANSPARENT: false,
    BLOOM: true,
    BLOOM_ITERATIONS: 8,
    BLOOM_RESOLUTION: 256,
    BLOOM_INTENSITY: 0.8,
    BLOOM_THRESHOLD: 0.6,
    BLOOM_SOFT_KNEE: 0.7,
    SUNRAYS: true,
    SUNRAYS_RESOLUTION: 196,
    SUNRAYS_WEIGHT: 1.0,
}

function pointerPrototype () {
    this.id = -1;
    this.texcoordX = 0;
    this.texcoordY = 0;
    this.prevTexcoordX = 0;
    this.prevTexcoordY = 0;
    this.deltaX = 0;
    this.deltaY = 0;
    this.down = false;
    this.moved = false;
    this.color = [30, 0, 300];
}

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

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

if (isMobile()) {
    config.DYE_RESOLUTION = 512;
}
if (!ext.supportLinearFiltering) {
    config.DYE_RESOLUTION = 512;
    config.SHADING = false;
    config.BLOOM = false;
    config.SUNRAYS = 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);
    }

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

    let status = gl.checkFramebufferStatus(gl.FRAMEBUFFER);
    return status == gl.FRAMEBUFFER_COMPLETE;
}

function startGUI () {
    var gui = new dat.GUI({ width: 300 });
    gui.add(config, 'DYE_RESOLUTION', { 'high': 1024, 'medium': 512, 'low': 256, 'very low': 128 }).name('quality').onFinishChange(initFramebuffers);
    gui.add(config, 'SIM_RESOLUTION', { '32': 32, '64': 64, '128': 128, '256': 256 }).name('sim resolution').onFinishChange(initFramebuffers);
    gui.add(config, 'DENSITY_DISSIPATION', 0, 4.0).name('density diffusion');
    gui.add(config, 'VELOCITY_DISSIPATION', 0, 4.0).name('velocity diffusion');
    gui.add(config, 'PRESSURE', 0.0, 1.0).name('pressure');
    gui.add(config, 'CURL', 0, 50).name('vorticity').step(1);
    gui.add(config, 'SPLAT_RADIUS', 0.01, 1.0).name('splat radius');
    gui.add(config, 'SHADING').name('shading').onFinishChange(updateKeywords);
    gui.add(config, 'COLORFUL').name('colorful');
    gui.add(config, 'PAUSED').name('paused').listen();

    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').onFinishChange(updateKeywords);
    bloomFolder.add(config, 'BLOOM_INTENSITY', 0.1, 2.0).name('intensity');
    bloomFolder.add(config, 'BLOOM_THRESHOLD', 0.0, 1.0).name('threshold');

    let sunraysFolder = gui.addFolder('Sunrays');
    sunraysFolder.add(config, 'SUNRAYS').name('enabled').onFinishChange(updateKeywords);
    sunraysFolder.add(config, 'SUNRAYS_WEIGHT', 0.3, 1.0).name('weight');

    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');
	/*
    let github = gui.add({ fun : () => {
        window.open('https://github.com/PavelDoGreat/WebGL-Fluid-Simulation');
        ga('send', 'event', 'link button', 'github');
    } }, 'fun').name('Github');
    github.__li.className = 'cr function bigFont';
    github.__li.style.borderLeft = '3px solid #8C8C8C';
    let githubIcon = document.createElement('span');
    github.domElement.parentElement.appendChild(githubIcon);
    githubIcon.className = 'icon github';

    let twitter = gui.add({ fun : () => {
        ga('send', 'event', 'link button', 'twitter');
        window.open('https://twitter.com/PavelDoGreat');
    } }, 'fun').name('Twitter');
    twitter.__li.className = 'cr function bigFont';
    twitter.__li.style.borderLeft = '3px solid #8C8C8C';
    let twitterIcon = document.createElement('span');
    twitter.domElement.parentElement.appendChild(twitterIcon);
    twitterIcon.className = 'icon twitter';

    let discord = gui.add({ fun : () => {
        ga('send', 'event', 'link button', 'discord');
        window.open('https://discordapp.com/invite/CeqZDDE');
    } }, 'fun').name('Discord');
    discord.__li.className = 'cr function bigFont';
    discord.__li.style.borderLeft = '3px solid #8C8C8C';
    let discordIcon = document.createElement('span');
    discord.domElement.parentElement.appendChild(discordIcon);
    discordIcon.className = 'icon discord';

    let app = gui.add({ fun : () => {
        ga('send', 'event', 'link button', 'app');
        window.open('http://onelink.to/5b58bn');
    } }, 'fun').name('Check out mobile app');
    app.__li.className = 'cr function appBigFont';
    app.__li.style.borderLeft = '3px solid #00FF7F';
    let appIcon = document.createElement('span');
    app.domElement.parentElement.appendChild(appIcon);
    appIcon.className = 'icon app';

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

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

function captureScreenshot () {
    let res = getResolution(config.CAPTURE_RESOLUTION);
    let target = createFBO(res.width, res.height, ext.formatRGBA.internalFormat, ext.formatRGBA.format, ext.halfFloatTexType, gl.NEAREST);
    render(target);

    let texture = framebufferToTexture(target);
    texture = normalizeTexture(texture, target.width, target.height);

    let captureCanvas = textureToCanvas(texture, target.width, target.height);
    let datauri = captureCanvas.toDataURL();
    downloadURI('fluid.png', datauri);
    URL.revokeObjectURL(datauri);
}

function framebufferToTexture (target) {
    gl.bindFramebuffer(gl.FRAMEBUFFER, target.fbo);
    let length = target.width * target.height * 4;
    let texture = new Float32Array(length);
    gl.readPixels(0, 0, target.width, target.height, gl.RGBA, gl.FLOAT, texture);
    return texture;
}

function normalizeTexture (texture, width, height) {
    let result = new Uint8Array(texture.length);
    let id = 0;
    for (let i = height - 1; i >= 0; i--) {
        for (let j = 0; j < width; j++) {
            let nid = i * width * 4 + j * 4;
            result[nid + 0] = clamp01(texture[id + 0]) * 255;
            result[nid + 1] = clamp01(texture[id + 1]) * 255;
            result[nid + 2] = clamp01(texture[id + 2]) * 255;
            result[nid + 3] = clamp01(texture[id + 3]) * 255;
            id += 4;
        }
    }
    return result;
}

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

function textureToCanvas (texture, width, height) {
    let captureCanvas = document.createElement('canvas');
    let ctx = captureCanvas.getContext('2d');
    captureCanvas.width = width;
    captureCanvas.height = height;

    let imageData = ctx.createImageData(width, height);
    imageData.data.set(texture);
    ctx.putImageData(imageData, 0, 0);

    return captureCanvas;
}

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);
}

class Material {
    constructor (vertexShader, fragmentShaderSource) {
        this.vertexShader = vertexShader;
        this.fragmentShaderSource = fragmentShaderSource;
        this.programs = [];
        this.activeProgram = null;
        this.uniforms = [];
    }

    setKeywords (keywords) {
        let hash = 0;
        for (let i = 0; i < keywords.length; i++)
            hash += hashCode(keywords[i]);

        let program = this.programs[hash];
        if (program == null)
        {
            let fragmentShader = compileShader(gl.FRAGMENT_SHADER, this.fragmentShaderSource, keywords);
            program = createProgram(this.vertexShader, fragmentShader);
            this.programs[hash] = program;
        }

        if (program == this.activeProgram) return;

        this.uniforms = getUniforms(program);
        this.activeProgram = program;
    }

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

class Program {
    constructor (vertexShader, fragmentShader) {
        this..........完整代码请登录后点击上方下载按钮下载查看