bytev-charts-beta/lib/plugin/three.js/examples/jsm/postprocessing/BloomPass.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 _Object$assign from "@babel/runtime-corejs2/core-js/object/assign";
import _Object$create from "@babel/runtime-corejs2/core-js/object/create";
import "core-js/modules/es.function.name.js";
import "core-js/modules/es.number.to-fixed.js";
import { AdditiveBlending, LinearFilter, RGBAFormat, ShaderMaterial, UniformsUtils, Vector2, WebGLRenderTarget } from "../../../build/three.module.js";
import { Pass } from "../postprocessing/Pass.js";
import { CopyShader } from "../shaders/CopyShader.js";
import { ConvolutionShader } from "../shaders/ConvolutionShader.js";

var BloomPass = function BloomPass(strength, kernelSize, sigma, resolution) {
  Pass.call(this);
  strength = strength !== undefined ? strength : 1;
  kernelSize = kernelSize !== undefined ? kernelSize : 25;
  sigma = sigma !== undefined ? sigma : 4.0;
  resolution = resolution !== undefined ? resolution : 256; // render targets

  var pars = {
    minFilter: LinearFilter,
    magFilter: LinearFilter,
    format: RGBAFormat
  };
  this.renderTargetX = new WebGLRenderTarget(resolution, resolution, pars);
  this.renderTargetX.texture.name = "BloomPass.x";
  this.renderTargetY = new WebGLRenderTarget(resolution, resolution, pars);
  this.renderTargetY.texture.name = "BloomPass.y"; // copy material

  if (CopyShader === undefined) console.error("BloomPass relies on CopyShader");
  var copyShader = CopyShader;
  this.copyUniforms = UniformsUtils.clone(copyShader.uniforms);
  this.copyUniforms["opacity"].value = strength;
  this.materialCopy = new ShaderMaterial({
    uniforms: this.copyUniforms,
    vertexShader: copyShader.vertexShader,
    fragmentShader: copyShader.fragmentShader,
    blending: AdditiveBlending,
    transparent: true
  }); // convolution material

  if (ConvolutionShader === undefined) console.error("BloomPass relies on ConvolutionShader");
  var convolutionShader = ConvolutionShader;
  this.convolutionUniforms = UniformsUtils.clone(convolutionShader.uniforms);
  this.convolutionUniforms["uImageIncrement"].value = BloomPass.blurX;
  this.convolutionUniforms["cKernel"].value = ConvolutionShader.buildKernel(sigma);
  this.materialConvolution = new ShaderMaterial({
    uniforms: this.convolutionUniforms,
    vertexShader: convolutionShader.vertexShader,
    fragmentShader: convolutionShader.fragmentShader,
    defines: {
      "KERNEL_SIZE_FLOAT": kernelSize.toFixed(1),
      "KERNEL_SIZE_INT": kernelSize.toFixed(0)
    }
  });
  this.needsSwap = false;
  this.fsQuad = new Pass.FullScreenQuad(null);
};

BloomPass.prototype = _Object$assign(_Object$create(Pass.prototype), {
  constructor: BloomPass,
  render: function render(renderer, writeBuffer, readBuffer, deltaTime, maskActive) {
    if (maskActive) renderer.state.buffers.stencil.setTest(false); // Render quad with blured scene into texture (convolution pass 1)

    this.fsQuad.material = this.materialConvolution;
    this.convolutionUniforms["tDiffuse"].value = readBuffer.texture;
    this.convolutionUniforms["uImageIncrement"].value = BloomPass.blurX;
    renderer.setRenderTarget(this.renderTargetX);
    renderer.clear();
    this.fsQuad.render(renderer); // Render quad with blured scene into texture (convolution pass 2)

    this.convolutionUniforms["tDiffuse"].value = this.renderTargetX.texture;
    this.convolutionUniforms["uImageIncrement"].value = BloomPass.blurY;
    renderer.setRenderTarget(this.renderTargetY);
    renderer.clear();
    this.fsQuad.render(renderer); // Render original scene with superimposed blur to texture

    this.fsQuad.material = this.materialCopy;
    this.copyUniforms["tDiffuse"].value = this.renderTargetY.texture;
    if (maskActive) renderer.state.buffers.stencil.setTest(true);
    renderer.setRenderTarget(readBuffer);
    if (this.clear) renderer.clear();
    this.fsQuad.render(renderer);
  }
});
BloomPass.blurX = new Vector2(0.001953125, 0.0);
BloomPass.blurY = new Vector2(0.0, 0.001953125);
export { BloomPass };