bytev-charts/lib/plugin/three.js/examples/js/shaders/BleachBypassShader.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.BleachBypassShader: 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.");
/**
 * Bleach bypass shader [http://en.wikipedia.org/wiki/Bleach_bypass]
 * - based on Nvidia example
 * http://developer.download.nvidia.com/shaderlibrary/webpages/shader_library.html#post_bleach_bypass
 */

THREE.BleachBypassShader = {
  uniforms: {
    "tDiffuse": {
      value: null
    },
    "opacity": {
      value: 1.0
    }
  },
  vertexShader: ["varying vec2 vUv;", "void main() {", "	vUv = uv;", "	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );", "}"].join("\n"),
  fragmentShader: ["uniform float opacity;", "uniform sampler2D tDiffuse;", "varying vec2 vUv;", "void main() {", "	vec4 base = texture2D( tDiffuse, vUv );", "	vec3 lumCoeff = vec3( 0.25, 0.65, 0.1 );", "	float lum = dot( lumCoeff, base.rgb );", "	vec3 blend = vec3( lum );", "	float L = min( 1.0, max( 0.0, 10.0 * ( lum - 0.45 ) ) );", "	vec3 result1 = 2.0 * base.rgb * blend;", "	vec3 result2 = 1.0 - 2.0 * ( 1.0 - blend ) * ( 1.0 - base.rgb );", "	vec3 newColor = mix( result1, result2, L );", "	float A2 = opacity * base.a;", "	vec3 mixRGB = A2 * newColor.rgb;", "	mixRGB += ( ( 1.0 - A2 ) * base.rgb );", "	gl_FragColor = vec4( mixRGB, base.a );", "}"].join("\n")
};