webgl_multiple_views

对应 three.js 示例地址 。

仅需关注 init 函数的内容，其他部分都是示例小程序所使用的描述配置。

example.js

import * as THREE from "three";

/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
  name: "webgl_multiple_views",
  useLoaders: [],
  info: [
    [
      {
        tag: "a",
        link: "https://threejs.org",
        content: "three.js"
      },
      {
        tag: "text",
        content: "- multiple views - webgl"
      }
    ]
  ],
  init: ({ window, canvas: rendererCanvas, GUI, Stats, needToDispose, useFrame }) => {
    let stats;
    let scene, renderer;
    let mouseX = 0, mouseY = 0;
    let windowWidth, windowHeight;
    const views = [
      {
        left: 0,
        bottom: 0,
        width: 0.5,
        height: 1,
        background: new THREE.Color().setRGB(0.5, 0.5, 0.7, THREE.SRGBColorSpace),
        eye: [0, 300, 1800],
        up: [0, 1, 0],
        fov: 30,
        updateCamera: function(camera, scene2, mouseX2) {
          camera.position.x += mouseX2 * 0.05;
          camera.position.x = Math.max(Math.min(camera.position.x, 2e3), -2e3);
          camera.lookAt(scene2.position);
        }
      },
      {
        left: 0.5,
        bottom: 0,
        width: 0.5,
        height: 0.5,
        background: new THREE.Color().setRGB(0.7, 0.5, 0.5, THREE.SRGBColorSpace),
        eye: [0, 1800, 0],
        up: [0, 0, 1],
        fov: 45,
        updateCamera: function(camera, scene2, mouseX2) {
          camera.position.x -= mouseX2 * 0.05;
          camera.position.x = Math.max(Math.min(camera.position.x, 2e3), -2e3);
          camera.lookAt(camera.position.clone().setY(0));
        }
      },
      {
        left: 0.5,
        bottom: 0.5,
        width: 0.5,
        height: 0.5,
        background: new THREE.Color().setRGB(0.5, 0.7, 0.7, THREE.SRGBColorSpace),
        eye: [1400, 800, 1400],
        up: [0, 1, 0],
        fov: 60,
        updateCamera: function(camera, scene2, mouseX2) {
          camera.position.y -= mouseX2 * 0.05;
          camera.position.y = Math.max(Math.min(camera.position.y, 1600), -1600);
          camera.lookAt(scene2.position);
        }
      }
    ];
    init();
    function init() {
      for (let ii = 0; ii < views.length; ++ii) {
        const view = views[ii];
        const camera = new THREE.PerspectiveCamera(
          view.fov,
          window.innerWidth / window.innerHeight,
          1,
          1e4
        );
        camera.position.fromArray(view.eye);
        camera.up.fromArray(view.up);
        view.camera = camera;
      }
      scene = new THREE.Scene();
      const light = new THREE.DirectionalLight(16777215, 3);
      light.position.set(0, 0, 1);
      scene.add(light);
      const canvas = document.createElement("canvas");
      canvas.width = 128;
      canvas.height = 128;
      const context = canvas.getContext("2d");
      const gradient = context.createRadialGradient(
        canvas.width / 2,
        canvas.height / 2,
        0,
        canvas.width / 2,
        canvas.height / 2,
        canvas.width / 2
      );
      gradient.addColorStop(0.1, "rgba(0,0,0,0.15)");
      gradient.addColorStop(1, "rgba(0,0,0,0)");
      context.fillStyle = gradient;
      context.fillRect(0, 0, canvas.width, canvas.height);
      const shadowTexture = new THREE.CanvasTexture(canvas);
      const shadowMaterial = new THREE.MeshBasicMaterial({ map: shadowTexture, transparent: true });
      const shadowGeo = new THREE.PlaneGeometry(300, 300, 1, 1);
      let shadowMesh;
      shadowMesh = new THREE.Mesh(shadowGeo, shadowMaterial);
      shadowMesh.position.y = -250;
      shadowMesh.rotation.x = -Math.PI / 2;
      scene.add(shadowMesh);
      shadowMesh = new THREE.Mesh(shadowGeo, shadowMaterial);
      shadowMesh.position.x = -400;
      shadowMesh.position.y = -250;
      shadowMesh.rotation.x = -Math.PI / 2;
      scene.add(shadowMesh);
      shadowMesh = new THREE.Mesh(shadowGeo, shadowMaterial);
      shadowMesh.position.x = 400;
      shadowMesh.position.y = -250;
      shadowMesh.rotation.x = -Math.PI / 2;
      scene.add(shadowMesh);
      const radius = 200;
      const geometry1 = new THREE.IcosahedronGeometry(radius, 1);
      const count = geometry1.attributes.position.count;
      geometry1.setAttribute("color", new THREE.BufferAttribute(new Float32Array(count * 3), 3));
      const geometry2 = geometry1.clone();
      const geometry3 = geometry1.clone();
      const color = new THREE.Color();
      const positions1 = geometry1.attributes.position;
      const positions2 = geometry2.attributes.position;
      const positions3 = geometry3.attributes.position;
      const colors1 = geometry1.attributes.color;
      const colors2 = geometry2.attributes.color;
      const colors3 = geometry3.attributes.color;
      for (let i = 0; i < count; i++) {
        color.setHSL((positions1.getY(i) / radius + 1) / 2, 1, 0.5, THREE.SRGBColorSpace);
        colors1.setXYZ(i, color.r, color.g, color.b);
        color.setHSL(0, (positions2.getY(i) / radius + 1) / 2, 0.5, THREE.SRGBColorSpace);
        colors2.setXYZ(i, color.r, color.g, color.b);
        color.setRGB(1, 0.8 - (positions3.getY(i) / radius + 1) / 2, 0, THREE.SRGBColorSpace);
        colors3.setXYZ(i, color.r, color.g, color.b);
      }
      const material = new THREE.MeshPhongMaterial({
        color: 16777215,
        flatShading: true,
        vertexColors: true,
        shininess: 0
      });
      const wireframeMaterial = new THREE.MeshBasicMaterial({
        color: 0,
        wireframe: true,
        transparent: true
      });
      let mesh = new THREE.Mesh(geometry1, material);
      let wireframe = new THREE.Mesh(geometry1, wireframeMaterial);
      mesh.add(wireframe);
      mesh.position.x = -400;
      mesh.rotation.x = -1.87;
      scene.add(mesh);
      mesh = new THREE.Mesh(geometry2, material);
      wireframe = new THREE.Mesh(geometry2, wireframeMaterial);
      mesh.add(wireframe);
      mesh.position.x = 400;
      scene.add(mesh);
      mesh = new THREE.Mesh(geometry3, material);
      wireframe = new THREE.Mesh(geometry3, wireframeMaterial);
      mesh.add(wireframe);
      scene.add(mesh);
      renderer = new THREE.WebGLRenderer({ antialias: true, canvas: rendererCanvas });
      renderer.setPixelRatio(window.devicePixelRatio);
      renderer.setSize(window.innerWidth, window.innerHeight);
      renderer.setAnimationLoop(animate);
      stats = new Stats(renderer);
      rendererCanvas.addEventListener("pointermove", onDocumentMouseMove);
      needToDispose(renderer, scene);
    }
    function onDocumentMouseMove(event) {
      mouseX = event.clientX - windowWidth / 2;
      mouseY = event.clientY - windowHeight / 2;
    }
    function updateSize() {
      if (windowWidth != window.innerWidth || windowHeight != window.innerHeight) {
        windowWidth = window.innerWidth;
        windowHeight = window.innerHeight;
        renderer.setSize(windowWidth, windowHeight);
      }
    }
    function animate() {
      render();
      stats.update();
    }
    function render() {
      updateSize();
      for (let ii = 0; ii < views.length; ++ii) {
        const view = views[ii];
        const camera = view.camera;
        view.updateCamera(camera, scene, mouseX, mouseY);
        const left = Math.floor(windowWidth * view.left);
        const bottom = Math.floor(windowHeight * view.bottom);
        const width = Math.floor(windowWidth * view.width);
        const height = Math.floor(windowHeight * view.height);
        renderer.setViewport(left, bottom, width, height);
        renderer.setScissor(left, bottom, width, height);
        renderer.setScissorTest(true);
        renderer.setClearColor(view.background);
        camera.aspect = width / height;
        camera.updateProjectionMatrix();
        renderer.render(scene, camera);
      }
    }
  }
};
export {
  exampleInfo as default
};

typings.d.ts

import { Loader, TypedArray } from 'three';
/**
 * 官网示例的多端使用封装把版本
 * */
export interface OfficialExampleInfo extends MiniProgramMeta {
  /*** 示例名称（保持和官网一致）*/
  name: string;
  /** main */
  init: (context: LoadContext) => void;
}

export interface LoadContext {
  //为了减少官方代码的改动，实际上等同于 canvas
  window: EventTarget & { innerWidth: number; innerHeight: number; devicePixelRatio: number };
  /** HTMLCanvasElement */
  canvas: any;
  /** https://www.npmjs.com/package/lil-gui */
  GUI: any;
  /**
   * https://www.npmjs.com/package/stats.js
   * 也可以使用其他受支持的版本
   * */
  Stats: any;
  /** 收集需要 dispose 的对象（官方示例没有处理这部分）*/
  needToDispose: (...objs: any[]) => void | ((fromFn: () => any[]) => void);

  /**基于 raq 的通用封装 */
  useFrame(animateFunc: (/** ms */ delta: number) => void): { cancel: () => void };

  /** 显示加载模态框 */
  requestLoading(text?: string): Promise<void>;

  /** 隐藏加载模态框*/
  cancelLoading(): void;

  /** 保存文件的通用封装*/
  saveFile(
    fileName: string,
    data: ArrayBuffer | TypedArray | DataView | string
  ): Promise<string | null>;

  /** 示例使用 DracoDecoder 时的资源路径 */
  DecoderPath: {
    GLTF: string;
    STANDARD: string;
  };

  /** 为资源路径拼上 CDN 前缀 */
  withCDNPrefix(path: string): string;

  /**
   * 在小程序中应使用 import { VideoTexture } from '@minisheep/three-platform-adapter/override/jsm/textures/VideoTexture.js';
   * 正常情况（web） 可直接使用 THREE.VideoTexture
   * */
  getVideoTexture(videoOptions: VideoOptions): Promise<[{ isVideoTexture: true }, video: any]>;

  /**
   * 在小程序中应使用 import { CameraTexture } from '@minisheep/three-platform-adapter/override/jsm/textures/CameraTexture.js';
   * 正常情况（web） 可参考示例 webgl_materials_video_webcam
   * */
  getCameraTexture(): { isVideoTexture: true };

  /** 用于动态修改 info 中的占位符*/
  bindInfoText(template: `$${string}$`, initValue?: string): { value: string };

  /** 分屏控件对应的事件回调 */
  onSlideStart(handle: () => void): void;
  /** 分屏控件对应的事件回调 */
  onSlideEnd(handle: () => void): void;
  /** 分屏控件对应的事件回调 */
  onSlideChange(handle: (offset: number, boxSize: number) => void): void;
}

export type VideoOptions = {
  src: string;
  /** 相当于 HTMLVideoElement 的 naturalWidth (小程序中获取不到)*/
  width: number;
  /** 相当于 HTMLVideoElement 的 naturalHeight (小程序中获取不到)*/
  height: number;
  loop?: boolean;
  autoplay?: boolean;
  muted?: boolean;
};

/** 示例小程序中使用的一些配置 */
export interface MiniProgramMeta {
  /** 用于统计加载相关信息 */
  useLoaders: Loader[];
  /** 通用 info */
  info: TagItem[][];
  /** 特殊 info */
  infoPanel?: {
    left?: [string, string][];
    right?: [string, string][];
  };
  /** 分屏控件配置 */
  needSlider?: {
    /** 方向 */
    direction?: 'horizontal' | 'vertical';
    /** 初始偏移 0-100 */
    initPosition?: number;
  };
  /** 操作摇杆控件 */
  needArrowControls?: boolean;
  /** 默认需要的画布类型 */
  canvasType?: '2d' | 'webgl' | 'webgl2';
  /** 为保持效果一致所需要的画布样式 */
  canvasStyle?: {
    bgColor?: string;
    width?: number | string;
    height?: number | string;
  };
  /** 部分示例需要在加载前进行一些提示 */
  initAfterConfirm?: {
    /**
     * 提示类型
     * @default 'default'
     * */
    type?: 'warning' | 'default';
    text: string[];
  };
}

export interface BaseTag<T extends string> {
  tag: T;
  content: string;
}

export interface ATag extends BaseTag<'a'> {
  link: string;
}

export type TextTag = BaseTag<'text'>;

export type TagItem = TextTag | ATag;