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

/**
 * Full-screen tone-mapping shader based on http://www.cis.rit.edu/people/faculty/ferwerda/publications/sig02_paper.pdf
 */
var ToneMapShader = {
  uniforms: {
    "tDiffuse": {
      value: null
    },
    "averageLuminance": {
      value: 1.0
    },
    "luminanceMap": {
      value: null
    },
    "maxLuminance": {
      value: 16.0
    },
    "minLuminance": {
      value: 0.01
    },
    "middleGrey": {
      value: 0.6
    }
  },
  vertexShader: ["varying vec2 vUv;", "void main() {", "	vUv = uv;", "	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );", "}"].join("\n"),
  fragmentShader: ["#include <common>", "uniform sampler2D tDiffuse;", "varying vec2 vUv;", "uniform float middleGrey;", "uniform float minLuminance;", "uniform float maxLuminance;", "#ifdef ADAPTED_LUMINANCE", "	uniform sampler2D luminanceMap;", "#else", "	uniform float averageLuminance;", "#endif", "vec3 ToneMap( vec3 vColor ) {", "	#ifdef ADAPTED_LUMINANCE", // Get the calculated average luminance
  "		float fLumAvg = texture2D(luminanceMap, vec2(0.5, 0.5)).r;", "	#else", "		float fLumAvg = averageLuminance;", "	#endif", // Calculate the luminance of the current pixel
  "	float fLumPixel = linearToRelativeLuminance( vColor );", // Apply the modified operator (Eq. 4)
  "	float fLumScaled = (fLumPixel * middleGrey) / max( minLuminance, fLumAvg );", "	float fLumCompressed = (fLumScaled * (1.0 + (fLumScaled / (maxLuminance * maxLuminance)))) / (1.0 + fLumScaled);", "	return fLumCompressed * vColor;", "}", "void main() {", "	vec4 texel = texture2D( tDiffuse, vUv );", "	gl_FragColor = vec4( ToneMap( texel.xyz ), texel.w );", "}"].join("\n")
};
export { ToneMapShader };