webgl_clipculldistance

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.jstypings.d.ts

import * as THREE from "three";
import { OrbitControls } from "three/examples/jsm/controls/OrbitControls.js";

/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
  name: "webgl_clipculldistance",
  useLoaders: [],
  info: [
    [
      {
        tag: "a",
        link: "https://threejs.org",
        content: "three.js"
      },
      {
        tag: "text",
        content: "- vertex shader clipping via"
      },
      {
        tag: "a",
        link: "https://registry.khronos.org/webgl/extensions/WEBGL_clip_cull_distance/",
        content: "WEBGL_clip_cull_distance"
      }
    ]
  ],
  init: ({ window, canvas, GUI, Stats, needToDispose, useFrame }) => {
    let camera, controls, clock, scene, renderer, stats;
    let material;
    init();
    function init() {
      camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 10);
      camera.position.z = 2;
      scene = new THREE.Scene();
      clock = new THREE.Clock();
      renderer = new THREE.WebGLRenderer({ antialias: true, canvas });
      renderer.setPixelRatio(window.devicePixelRatio);
      renderer.setSize(window.innerWidth, window.innerHeight);
      renderer.setAnimationLoop(animate);
      if (renderer.extensions.has("WEBGL_clip_cull_distance") === false) {
        console.error("WEBGL_clip_cull_distance not supported");
        return;
      }
      const ext = renderer.getContext().getExtension("WEBGL_clip_cull_distance");
      const gl = renderer.getContext();
      gl.enable(ext.CLIP_DISTANCE0_WEBGL);
      const vertexCount = 200 * 3;
      const geometry = new THREE.BufferGeometry();
      const positions = [];
      const colors = [];
      for (let i = 0; i < vertexCount; i++) {
        positions.push(Math.random() - 0.5);
        positions.push(Math.random() - 0.5);
        positions.push(Math.random() - 0.5);
        colors.push(Math.random() * 255);
        colors.push(Math.random() * 255);
        colors.push(Math.random() * 255);
        colors.push(Math.random() * 255);
      }
      const positionAttribute = new THREE.Float32BufferAttribute(positions, 3);
      const colorAttribute = new THREE.Uint8BufferAttribute(colors, 4);
      colorAttribute.normalized = true;
      geometry.setAttribute("position", positionAttribute);
      geometry.setAttribute("color", colorAttribute);
      material = new THREE.ShaderMaterial({
        uniforms: {
          time: { value: 1 }
        },
        vertexShader: `
			uniform float time;
			varying vec4 vColor;
			void main() {
				vColor = color;
				#ifdef USE_CLIP_DISTANCE
					vec4 worldPosition = modelMatrix * vec4( position, 1.0 );
					gl_ClipDistance[ 0 ] = worldPosition.x - sin( time ) * ( 0.5 );
				#endif
				gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
			}
		`,
        fragmentShader: `
			varying vec4 vColor;
			void main() {
				gl_FragColor = vColor;
			}
		`,
        side: THREE.DoubleSide,
        transparent: true,
        vertexColors: true
      });
      material.extensions.clipCullDistance = true;
      const mesh = new THREE.Mesh(geometry, material);
      scene.add(mesh);
      controls = new OrbitControls(camera, renderer.domElement);
      stats = new Stats(renderer);
      window.addEventListener("resize", onWindowResize);
      needToDispose(renderer, scene, controls);
    }
    function onWindowResize() {
      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();
      renderer.setSize(window.innerWidth, window.innerHeight);
    }
    function animate() {
      controls.update();
      stats.update();
      material.uniforms.time.value = clock.getElapsedTime();
      renderer.render(scene, camera);
    }
  }
};
export {
  exampleInfo as default
};

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;

webgl_clipculldistance ​

webgl_clipculldistance