bytev-charts/lib/plugin/three.js/examples/js/shaders/BokehShader.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.BokehShader: 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.");
/**
 * Depth-of-field shader with bokeh
 * ported from GLSL shader by Martins Upitis
 * http://artmartinsh.blogspot.com/2010/02/glsl-lens-blur-filter-with-bokeh.html
 */

THREE.BokehShader = {
  defines: {
    "DEPTH_PACKING": 1,
    "PERSPECTIVE_CAMERA": 1
  },
  uniforms: {
    "tColor": {
      value: null
    },
    "tDepth": {
      value: null
    },
    "focus": {
      value: 1.0
    },
    "aspect": {
      value: 1.0
    },
    "aperture": {
      value: 0.025
    },
    "maxblur": {
      value: 0.01
    },
    "nearClip": {
      value: 1.0
    },
    "farClip": {
      value: 1000.0
    }
  },
  vertexShader: ["varying vec2 vUv;", "void main() {", "	vUv = uv;", "	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );", "}"].join("\n"),
  fragmentShader: ["#include <common>", "varying vec2 vUv;", "uniform sampler2D tColor;", "uniform sampler2D tDepth;", "uniform float maxblur;", // max blur amount
  "uniform float aperture;", // aperture - bigger values for shallower depth of field
  "uniform float nearClip;", "uniform float farClip;", "uniform float focus;", "uniform float aspect;", "#include <packing>", "float getDepth( const in vec2 screenPosition ) {", "	#if DEPTH_PACKING == 1", "	return unpackRGBAToDepth( texture2D( tDepth, screenPosition ) );", "	#else", "	return texture2D( tDepth, screenPosition ).x;", "	#endif", "}", "float getViewZ( const in float depth ) {", "	#if PERSPECTIVE_CAMERA == 1", "	return perspectiveDepthToViewZ( depth, nearClip, farClip );", "	#else", "	return orthographicDepthToViewZ( depth, nearClip, farClip );", "	#endif", "}", "void main() {", "	vec2 aspectcorrect = vec2( 1.0, aspect );", "	float viewZ = getViewZ( getDepth( vUv ) );", "	float factor = ( focus + viewZ );", // viewZ is <= 0, so this is a difference equation
  "	vec2 dofblur = vec2 ( clamp( factor * aperture, -maxblur, maxblur ) );", "	vec2 dofblur9 = dofblur * 0.9;", "	vec2 dofblur7 = dofblur * 0.7;", "	vec2 dofblur4 = dofblur * 0.4;", "	vec4 col = vec4( 0.0 );", "	col += texture2D( tColor, vUv.xy );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.0,   0.4  ) * aspectcorrect ) * dofblur );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.15,  0.37 ) * aspectcorrect ) * dofblur );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.29,  0.29 ) * aspectcorrect ) * dofblur );", "	col += texture2D( tColor, vUv.xy + ( vec2( -0.37,  0.15 ) * aspectcorrect ) * dofblur );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.40,  0.0  ) * aspectcorrect ) * dofblur );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.37, -0.15 ) * aspectcorrect ) * dofblur );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.29, -0.29 ) * aspectcorrect ) * dofblur );", "	col += texture2D( tColor, vUv.xy + ( vec2( -0.15, -0.37 ) * aspectcorrect ) * dofblur );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.0,  -0.4  ) * aspectcorrect ) * dofblur );", "	col += texture2D( tColor, vUv.xy + ( vec2( -0.15,  0.37 ) * aspectcorrect ) * dofblur );", "	col += texture2D( tColor, vUv.xy + ( vec2( -0.29,  0.29 ) * aspectcorrect ) * dofblur );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.37,  0.15 ) * aspectcorrect ) * dofblur );", "	col += texture2D( tColor, vUv.xy + ( vec2( -0.4,   0.0  ) * aspectcorrect ) * dofblur );", "	col += texture2D( tColor, vUv.xy + ( vec2( -0.37, -0.15 ) * aspectcorrect ) * dofblur );", "	col += texture2D( tColor, vUv.xy + ( vec2( -0.29, -0.29 ) * aspectcorrect ) * dofblur );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.15, -0.37 ) * aspectcorrect ) * dofblur );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.15,  0.37 ) * aspectcorrect ) * dofblur9 );", "	col += texture2D( tColor, vUv.xy + ( vec2( -0.37,  0.15 ) * aspectcorrect ) * dofblur9 );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.37, -0.15 ) * aspectcorrect ) * dofblur9 );", "	col += texture2D( tColor, vUv.xy + ( vec2( -0.15, -0.37 ) * aspectcorrect ) * dofblur9 );", "	col += texture2D( tColor, vUv.xy + ( vec2( -0.15,  0.37 ) * aspectcorrect ) * dofblur9 );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.37,  0.15 ) * aspectcorrect ) * dofblur9 );", "	col += texture2D( tColor, vUv.xy + ( vec2( -0.37, -0.15 ) * aspectcorrect ) * dofblur9 );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.15, -0.37 ) * aspectcorrect ) * dofblur9 );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.29,  0.29 ) * aspectcorrect ) * dofblur7 );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.40,  0.0  ) * aspectcorrect ) * dofblur7 );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.29, -0.29 ) * aspectcorrect ) * dofblur7 );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.0,  -0.4  ) * aspectcorrect ) * dofblur7 );", "	col += texture2D( tColor, vUv.xy + ( vec2( -0.29,  0.29 ) * aspectcorrect ) * dofblur7 );", "	col += texture2D( tColor, vUv.xy + ( vec2( -0.4,   0.0  ) * aspectcorrect ) * dofblur7 );", "	col += texture2D( tColor, vUv.xy + ( vec2( -0.29, -0.29 ) * aspectcorrect ) * dofblur7 );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.0,   0.4  ) * aspectcorrect ) * dofblur7 );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.29,  0.29 ) * aspectcorrect ) * dofblur4 );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.4,   0.0  ) * aspectcorrect ) * dofblur4 );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.29, -0.29 ) * aspectcorrect ) * dofblur4 );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.0,  -0.4  ) * aspectcorrect ) * dofblur4 );", "	col += texture2D( tColor, vUv.xy + ( vec2( -0.29,  0.29 ) * aspectcorrect ) * dofblur4 );", "	col += texture2D( tColor, vUv.xy + ( vec2( -0.4,   0.0  ) * aspectcorrect ) * dofblur4 );", "	col += texture2D( tColor, vUv.xy + ( vec2( -0.29, -0.29 ) * aspectcorrect ) * dofblur4 );", "	col += texture2D( tColor, vUv.xy + ( vec2(  0.0,   0.4  ) * aspectcorrect ) * dofblur4 );", "	gl_FragColor = col / 41.0;", "	gl_FragColor.a = 1.0;", "}"].join("\n")
};