webgl_materials_blending
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。
js
import * as THREE from "three";
/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
name: "webgl_materials_blending",
canvasStyle: {
bgColor: "black"
},
useLoaders: [],
info: [],
init: ({ window, canvas, GUI, Stats, needToDispose, useFrame }) => {
let camera, scene, renderer;
let mapBg;
const textureLoader = new THREE.TextureLoader();
init();
function init() {
camera = new THREE.PerspectiveCamera(70, window.innerWidth / window.innerHeight, 1, 1e3);
camera.position.z = 600;
scene = new THREE.Scene();
const textureCanvas = document.createElement("canvas");
const ctx = textureCanvas.getContext("2d");
textureCanvas.width = textureCanvas.height = 128;
ctx.fillStyle = "#ddd";
ctx.fillRect(0, 0, 128, 128);
ctx.fillStyle = "#555";
ctx.fillRect(0, 0, 64, 64);
ctx.fillStyle = "#999";
ctx.fillRect(32, 32, 32, 32);
ctx.fillStyle = "#555";
ctx.fillRect(64, 64, 64, 64);
ctx.fillStyle = "#777";
ctx.fillRect(96, 96, 32, 32);
mapBg = new THREE.CanvasTexture(textureCanvas);
mapBg.colorSpace = THREE.SRGBColorSpace;
mapBg.wrapS = mapBg.wrapT = THREE.RepeatWrapping;
mapBg.repeat.set(64, 32);
scene.background = mapBg;
const blendings = [
{ name: "No", constant: THREE.NoBlending },
{ name: "Normal", constant: THREE.NormalBlending },
{ name: "Additive", constant: THREE.AdditiveBlending },
{ name: "Subtractive", constant: THREE.SubtractiveBlending },
{ name: "Multiply", constant: THREE.MultiplyBlending }
];
const assignSRGB = (texture) => {
texture.colorSpace = THREE.SRGBColorSpace;
};
const map0 = textureLoader.load("textures/uv_grid_opengl.jpg", assignSRGB);
const map1 = textureLoader.load("textures/sprite0.jpg", assignSRGB);
const map2 = textureLoader.load("textures/sprite0.png", assignSRGB);
const map3 = textureLoader.load("textures/lensflare/lensflare0.png", assignSRGB);
const map4 = textureLoader.load("textures/lensflare/lensflare0_alpha.png", assignSRGB);
const geo1 = new THREE.PlaneGeometry(100, 100);
const geo2 = new THREE.PlaneGeometry(100, 25);
addImageRow(map0, 300);
addImageRow(map1, 150);
addImageRow(map2, 0);
addImageRow(map3, -150);
addImageRow(map4, -300);
function addImageRow(map, y) {
for (let i = 0; i < blendings.length; i++) {
const blending = blendings[i];
const material = new THREE.MeshBasicMaterial({ map });
material.transparent = true;
material.blending = blending.constant;
const x = (i - blendings.length / 2) * 110;
const z = 0;
let mesh = new THREE.Mesh(geo1, material);
mesh.position.set(x, y, z);
scene.add(mesh);
mesh = new THREE.Mesh(geo2, generateLabelMaterial(blending.name));
mesh.position.set(x, y - 75, z);
scene.add(mesh);
}
}
renderer = new THREE.WebGLRenderer({ canvas });
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.setAnimationLoop(animate);
window.addEventListener("resize", onWindowResize);
needToDispose(renderer, scene);
}
function onWindowResize() {
const SCREEN_WIDTH = window.innerWidth;
const SCREEN_HEIGHT = window.innerHeight;
renderer.setSize(SCREEN_WIDTH, SCREEN_HEIGHT);
camera.aspect = SCREEN_WIDTH / SCREEN_HEIGHT;
camera.updateProjectionMatrix();
}
function generateLabelMaterial(text) {
const canvas2 = document.createElement("canvas");
const ctx = canvas2.getContext("2d");
canvas2.width = 128;
canvas2.height = 32;
ctx.fillStyle = "rgba( 0, 0, 0, 0.95 )";
ctx.fillRect(0, 0, 128, 32);
ctx.fillStyle = "white";
ctx.font = "bold 12pt arial";
ctx.fillText(text, 10, 22);
const map = new THREE.CanvasTexture(canvas2);
map.colorSpace = THREE.SRGBColorSpace;
const material = new THREE.MeshBasicMaterial({ map, transparent: true });
return material;
}
function animate() {
const time = Date.now() * 25e-5;
const ox = time * -0.01 * mapBg.repeat.x % 1;
const oy = time * -0.01 * mapBg.repeat.y % 1;
mapBg.offset.set(ox, oy);
renderer.render(scene, camera);
}
}
};
export {
exampleInfo as default
};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;