bytev-charts/lib/plugin/three.js/examples/jsm/shaders/SepiaShader.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";

/**
 * Sepia tone shader
 * based on glfx.js sepia shader
 * https://github.com/evanw/glfx.js
 */
var SepiaShader = {
  uniforms: {
    "tDiffuse": {
      value: null
    },
    "amount": {
      value: 1.0
    }
  },
  vertexShader: ["varying vec2 vUv;", "void main() {", "	vUv = uv;", "	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );", "}"].join("\n"),
  fragmentShader: ["uniform float amount;", "uniform sampler2D tDiffuse;", "varying vec2 vUv;", "void main() {", "	vec4 color = texture2D( tDiffuse, vUv );", "	vec3 c = color.rgb;", "	color.r = dot( c, vec3( 1.0 - 0.607 * amount, 0.769 * amount, 0.189 * amount ) );", "	color.g = dot( c, vec3( 0.349 * amount, 1.0 - 0.314 * amount, 0.168 * amount ) );", "	color.b = dot( c, vec3( 0.272 * amount, 0.534 * amount, 1.0 - 0.869 * amount ) );", "	gl_FragColor = vec4( min( vec3( 1.0 ), color.rgb ), color.a );", "}"].join("\n")
};
export { SepiaShader };