import * as THREE from "three";
// 导入轨道控制器
import {OrbitControls} from "three/examples/jsm/controls/OrbitControls";
// 导入动画库

import {EffectComposer} from "three/examples/jsm/postprocessing/EffectComposer.js";
import {RenderPass} from "three/examples/jsm/postprocessing/RenderPass.js";
import {UnrealBloomPass} from "three/examples/jsm/postprocessing/UnrealBloomPass.js";

// 1、创建场景
const scene = new THREE.Scene();

// 2、创建相机
const camera = new THREE.PerspectiveCamera(
  75,
  window.innerWidth / window.innerHeight,
  0.1,
  1000
);
camera.aspect = window.innerWidth / window.innerHeight;
//   更新摄像机的投影矩阵
camera.updateProjectionMatrix();

// 设置相机位置
camera.position.set(0, 0, 20);
scene.add(camera);

// 创建一个金属球添加到场景中
const geometry = new THREE.SphereGeometry(1, 32, 32);
const material1 = new THREE.MeshBasicMaterial({
  color: "#ffaa33",
});
const sphere = new THREE.Mesh(geometry, material1);
sphere.position.set(-5, 0, 0);
sphere.layers.set(1);
scene.add(sphere);

// 创建一个正方体
const geometry2 = new THREE.BoxGeometry(1, 1, 1);
const material2 = new THREE.MeshStandardMaterial({
  emissive: 0x33ff33,
});
const cube = new THREE.Mesh(geometry2, material2);
cube.position.set(5, 0, 0);
scene.add(cube);

// 创建一个纽结体
const geometry3 = new THREE.TorusKnotGeometry(1, 0.3, 100, 16);
const material3 = new THREE.MeshStandardMaterial({
  emissive: 0x33ff33,
});
const torusKnot = new THREE.Mesh(geometry3, material3);
torusKnot.position.set(0, 0, 0);
scene.add(torusKnot);

// 初始化渲染器
const renderer = new THREE.WebGLRenderer();
// 设置渲染的尺寸大小
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.autoClear = false;

// 添加效果合成
const composer = new EffectComposer(renderer);
composer.setSize(window.innerWidth, window.innerHeight);
const renderPass = new RenderPass(scene, camera);
composer.addPass(renderPass);
const effect = new UnrealBloomPass(
  new THREE.Vector2(window.innerWidth, window.innerHeight),
  3,
  0.5,
  0
);
composer.addPass(effect);

// 将webgl渲染的canvas内容添加到body
document.body.appendChild(renderer.domElement);

// 创建轨道控制器
const controls = new OrbitControls(camera, renderer.domElement);
// 设置控制器阻尼，让控制器更有真实效果,必须在动画循环里调用.update()。
controls.enableDamping = true;

function render() {
  // 因为渲染器autoClear关掉了
  // 所以，每次渲染前，先清理渲染器缓冲区
  renderer.clear();
  // 相机可见层级设置为0
  camera.layers.set(0);
  // 效果组合器，后期加工后，渲染出场景
  composer.render();

  // 做深度清理，具体为什么做深度清理，没理解
  renderer.clearDepth();
  camera.layers.set(1);
  // 再叠上一层
  renderer.render(scene, camera);
  // 渲染下一帧的时候就会调用render函数
  requestAnimationFrame(render);
}

render();

// 监听画面变化，更新渲染画面
window.addEventListener("resize", () => {
  // 更新摄像头
  camera.aspect = window.innerWidth / window.innerHeight;
  //   更新摄像机的投影矩阵
  camera.updateProjectionMatrix();

  // 更新渲染器
  renderer.setSize(window.innerWidth, window.innerHeight);
  // 设置渲染器的像素比
  renderer.setPixelRatio(window.devicePixelRatio);
});

window.addEventListener("click", () => {
  cube.layers.set(1);
});