canvas实现webgl跟随鼠标可调节参数的小鬼交互效果代码-html代码-BFW代码库

代码语言：html

所属分类：动画

代码描述：canvas实现webgl跟随鼠标可调节参数的小鬼交互效果代码

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 lang="en" >

<head>
  <meta charset="UTF-8">
  

  
  
  
<style>
body, html {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #2C3E50;
}

canvas#ghost {
    position: fixed;
    top: 0;
    left: 0;
    display: block;
    width: 100%;
    z-index: 10000;
    pointer-events: none;
}

.page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-align: center;
    font-size: 4vw;
    text-shadow: 0 0 5px #000000;
}

.lil-gui {
    --width: 300px;
    max-width: 90%;
    --widget-height: 20px;
    font-size: 15px;
    --input-font-size: 15px;
    --padding: 10px;
    --spacing: 10px;
    --slider-knob-width: 5px;
    --background-color: rgba(5, 0, 15, .8);
    --widget-color: rgba(255, 255, 255, .3);
    --focus-color: rgba(255, 255, 255, .4);
    --hover-color: rgba(255, 255, 255, .5);
    --font-family: monospace;
    z-index: 1;
}
</style>


  
  
</head>

<body >
  <div class="page">
    WebGL Ghost Cursor
</div>

<canvas id="ghost"></canvas>


<script type="x-shader/x-fragment" id="vertShader">
    precision mediump float;

    varying vec2 vUv;
    attribute vec2 a_position;

    void main() {
        vUv = .5 * (a_position + 1.);
        gl_Position = vec4(a_position, 0.0, 1.0);
    }
</script>


<script type="x-shader/x-fragment" id="fragShader">
    precision mediump float;

    varying vec2 vUv;
    uniform float u_time;
    uniform float u_ratio;
    uniform float u_size;
    uniform vec2 u_pointer;
    uniform float u_smile;
    uniform vec2 u_target_pointer;
    uniform vec3 u_main_color;
    uniform vec3 u_border_color;
    uniform float u_flat_color;
    uniform sampler2D u_texture;

    #define TWO_PI 6.28318530718
    #define PI 3.14159265358979323846

    vec3 mod289(vec3 x) { return x - floor(x * (1.0 / 289.0)) * 289.0; }
    vec2 mod289(vec2 x) { return x - floor(x * (1.0 / 289.0)) * 289.0; }
    vec3 permute(vec3 x) { return mod289(((x*34.0)+1.0)*x); }
    float snoise(vec2 v) {
        const vec4 C = vec4(0.211324865405187, 0.366025403784439, -0.577350269189626, 0.024390243902439);
        vec2 i = floor(v + dot(v, C.yy));
        vec2 x0 = v - i + dot(i, C.xx);
        vec2 i1;
        i1 = (x0.x > x0.y) ? vec2(1.0, 0.0) : vec2(0.0, 1.0);
        vec4 x12 = x0.xyxy + C.xxzz;
        x12.xy -= i1;
        i = mod289(i);
        vec3 p = permute(permute(i.y + vec3(0.0, i1.y, 1.0)) + i.x + vec3(0.0, i1.x, 1.0));
        vec3 m = max(0.5 - vec3(dot(x0, x0), dot(x12.xy, x12.xy), dot(x12.zw, x12.zw)), 0.0);
        m = m*m;
        m = m*m;
        vec3 x = 2.0 * fract(p * C.www) - 1.0;
        vec3 h = abs(x) - 0.5;
        vec3 ox = floor(x + 0.5);
        vec3 a0 = x - ox;
        m *= 1.79284291400159 - 0.85373472095314 * (a0*a0 + h*h);
        vec3 g;
        g.x = a0.x * x0.x + h.x * x0.y;
        g.yz = a0.yz * x12.xz + h.yz * x12.yw;
        return 130.0 * dot(m, g);
    }
    vec2 rotate(vec2 v, float angle) {
        float r_sin = sin(angle);
        float r_cos = cos(angle);
        return vec2(v.x * r_cos - v.y * r_sin, v.x * r_sin + v.y * r_cos);
    }

    float eyes(vec2 uv) {
        uv.y -= .5;
        uv.x *= 1.;
        uv.y *= .8;
        uv.x = abs(uv.x);
        uv.y += u_smile * .3 * pow(uv.x, 1.3);
        uv.x -= (.6 + .2 * u_smile);

        float d = clamp(length(uv), 0., 1.);
        return 1. - pow(d, .08);
    }

    float mouth(vec2 uv) {
        uv.y += 1.5;

        uv.x *= (.5 + .5 * abs(1. - u_smile));
        uv.y *= (3. - 2. * abs(1. - u_smile));
        uv.y -= u_smile * 4. * pow(uv.x, 2.);

        float d = clamp(length(uv), 0., 1.);
        return 1. - pow(d, .07);
    }

    float face(vec2 uv, float rotation) {
        uv = rotate(uv, rotation);
        uv /= (.27 * u_size);

        float eyes_shape = 10. * eyes(uv);
        float mouth_shape = 20. * mouth(uv);

        float col = 0.;
        col = mix(col, 1., eyes_shape);
        col = mix(col, 1., mouth_shape);

        return col;
    }

    void main() {

        vec2 point = u_pointer;
        point.x *= u_ratio;

        vec2 uv = vUv;
        uv.x *= u_ratio;
        uv -= point;

        float texture = texture2D(u_texture, vec2(vUv.x, 1. - vUv.y)).r;
        float shape = texture;

        float noise = snoise(uv * vec2(.7 / u_size, .6 / u_size) + vec2(0., .0015 * u_time));
        noise += 1.2;
        noise *= 2.1;
        noise += smoothstep(-.8, -.2, (uv.y) / u_size);

        float face = face(uv, 5. * (u_target_pointer.x - u_pointer.x));
        shape -= face;

        shape *= noise;

        vec3 border = (1. - u_border_color);
        border.g += .2 * sin(.005 * u_time);
        border *= .5;

        vec3 color = u_main_color;
        color -= (1. - u_flat_color) * border * smoothstep(.0, .01, shape);

        shape = u_flat_color * smoothstep(.8, 1., shape) + (1. - u_flat_color) * shape;
        color *= shape;

        gl_FragColor = vec4(color, shape);
    }
</script>
  
      <script type="module">
import GUI from "//repo.bfw.wiki/bfwrepo/js/lil-gui.esm.js";

const canvasEl = document.querySelector("#ghost");

const mouseThreshold = .1;
const devicePixelRatio = Math.min(window.devicePixelRatio, 2);

const mouse = {
  x: .25 * window.innerWidth,
  y: .4 * window.innerHeight,
  tX: .25 * window.innerWidth,
  tY: .45 * window.innerHeight,
  moving: false,
  controlsPadding: 0 };


const params = {
  size: .1,
  tail: {
    dotsNumber: 25,
    spring: 1.4,
    friction: .3,
    maxGravity: 50,
    gravity: 25 },

  smile: 1,
  mainColor: [.98, .96, .96],
  borderColor: [.2, .5, .7],
  isFlatColor: false };



const textureEl = document.createElement("canvas");
const textureCtx = textureEl.getContext("2d");
const pointerTrail = new Array(params.tail.dotsNumber);
let dotSize = i => params.size * window.innerHeight * (1. - .2 * Math.pow(3. * i / params.tail.dotsNumber - 1., 2.));
for (let i = 0; i < params.tail.dotsNumber; i++) {
  pointerTrail[i] = {
    x: mouse.x,
    y: mouse.y,
    vx: 0,
    vy: 0,
    opacity: .04 + .3 * Math.pow(1 - i / params.tail.dotsNumber, 4),
    bordered: .6 * Math.pow(1 - i / pointerTrail.length, 1),
    r: dotSize(i) };

}


let uniforms;
const gl = initShader();
createControls();

window.addEventListener("resize", resizeCanvas);
resizeCanvas();
render();

window.addEventListener("mousemove", e => {
  updateMousePosition(e.pageX, e.pageY);
});
window.addEventListener("touchmove", e => {
  updateMousePosition(e.targetTouches[0].pageX, e.targetTouches[0].pageY);
});
window.addEventListener("click", e => {
  updateMousePosition(e.pageX, e.pageY);
});

let movingTimer = setTimeout(() => mouse.moving = false, 300);

function updateMousePosition(eX, eY) {
  mouse.moving = true;
  if (mouse.co.........完整代码请登录后点击上方下载按钮下载查看