bytev-charts/lib/plugin/three.js/examples/js/shaders/DigitalGlitch.js

基于echarts和JavaScript及ES6封装的一个可以直接调用的图表组件库，内置主题设计，简单快捷，且支持用户自定义配置； npm 安装方式: npm install bytev-charts 若启动提示还需额外install插件,则运行 npm install @babel/runtime-corejs2 即可;

import "core-js/modules/es.array.join.js";
console.warn("THREE.DigitalGlitch: As part of the transition to ES6 Modules, the files in 'examples/js' were deprecated in May 2020 (r117) and will be deleted in December 2020 (r124). You can find more information about developing using ES6 Modules in https://threejs.org/docs/#manual/en/introduction/Installation.");
/**
 * RGB Shift Shader
 * Shifts red and blue channels from center in opposite directions
 * Ported from http://kriss.cx/tom/2009/05/rgb-shift/
 * by Tom Butterworth / http://kriss.cx/tom/
 *
 * amount: shift distance (1 is width of input)
 * angle: shift angle in radians
 */

THREE.DigitalGlitch = {
  uniforms: {
    "tDiffuse": {
      value: null
    },
    //diffuse texture
    "tDisp": {
      value: null
    },
    //displacement texture for digital glitch squares
    "byp": {
      value: 0
    },
    //apply the glitch ?
    "amount": {
      value: 0.08
    },
    "angle": {
      value: 0.02
    },
    "seed": {
      value: 0.02
    },
    "seed_x": {
      value: 0.02
    },
    //-1,1
    "seed_y": {
      value: 0.02
    },
    //-1,1
    "distortion_x": {
      value: 0.5
    },
    "distortion_y": {
      value: 0.6
    },
    "col_s": {
      value: 0.05
    }
  },
  vertexShader: ["varying vec2 vUv;", "void main() {", "	vUv = uv;", "	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );", "}"].join("\n"),
  fragmentShader: ["uniform int byp;", //should we apply the glitch ?
  "uniform sampler2D tDiffuse;", "uniform sampler2D tDisp;", "uniform float amount;", "uniform float angle;", "uniform float seed;", "uniform float seed_x;", "uniform float seed_y;", "uniform float distortion_x;", "uniform float distortion_y;", "uniform float col_s;", "varying vec2 vUv;", "float rand(vec2 co){", "	return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);", "}", "void main() {", "	if(byp<1) {", "		vec2 p = vUv;", "		float xs = floor(gl_FragCoord.x / 0.5);", "		float ys = floor(gl_FragCoord.y / 0.5);", //based on staffantans glitch shader for unity https://github.com/staffantan/unityglitch
  "		vec4 normal = texture2D (tDisp, p*seed*seed);", "		if(p.y<distortion_x+col_s && p.y>distortion_x-col_s*seed) {", "			if(seed_x>0.){", "				p.y = 1. - (p.y + distortion_y);", "			}", "			else {", "				p.y = distortion_y;", "			}", "		}", "		if(p.x<distortion_y+col_s && p.x>distortion_y-col_s*seed) {", "			if(seed_y>0.){", "				p.x=distortion_x;", "			}", "			else {", "				p.x = 1. - (p.x + distortion_x);", "			}", "		}", "		p.x+=normal.x*seed_x*(seed/5.);", "		p.y+=normal.y*seed_y*(seed/5.);", //base from RGB shift shader
  "		vec2 offset = amount * vec2( cos(angle), sin(angle));", "		vec4 cr = texture2D(tDiffuse, p + offset);", "		vec4 cga = texture2D(tDiffuse, p);", "		vec4 cb = texture2D(tDiffuse, p - offset);", "		gl_FragColor = vec4(cr.r, cga.g, cb.b, cga.a);", //add noise
  "		vec4 snow = 200.*amount*vec4(rand(vec2(xs * seed,ys * seed*50.))*0.2);", "		gl_FragColor = gl_FragColor+ snow;", "	}", "	else {", "		gl_FragColor=texture2D (tDiffuse, vUv);", "	}", "}"].join("\n")
};