behavior.js

import {
  createScopedThreejs
} from 'threejs-miniprogram'
import {
  registerGLTFLoader
} from '../loaders/gltf-loader'
import cloneGltf from '../loaders/gltf-clone'

const info = wx.getSystemInfoSync()

export default function getBehavior() {
  return Behavior({
    data: {
      width: 1,
      height: 1,
      fps: 0,
      memory: 0,
      cpu: 0,
    },
    methods: {
      onReady() {

        wx.createSelectorQuery()
          .select('#webgl')
          .node()
          .exec(res => {
            this.canvas = res[0].node

            const info = wx.getSystemInfoSync()
            const pixelRatio = info.pixelRatio
            const calcSize = (width, height) => {
              console.log(`canvas size: width = ${width} , height = ${height}`)
              this.canvas.width = width * pixelRatio
              this.canvas.height = height * pixelRatio
              this.setData({
                width,
                height,
              })
            }
            calcSize(info.windowWidth, info.windowHeight * 0.8)

            this.initVK()
          })
      },
      onUnload() {
        if (this._texture) {
          this._texture.dispose()
          this._texture = null
        }
        if (this.renderer) {
          this.renderer.dispose()
          this.renderer = null
        }
        if (this.scene) {
          this.scene.dispose()
          this.scene = null
        }
        if (this.scene2) {
          this.scene2.dispose()
          this.scene2 = null
        }
        if (this.camera) this.camera = null
        if (this.model) this.model = null
        if (this._insertModel) this._insertModel = null
        if (this._insertModels) this._insertModels = null
        if (this.planeBox) this.planeBox = null
        if (this.robotBox) this.robotBox = null
        if (this.mixers) {
          this.mixers.forEach(mixer => mixer.uncacheRoot(mixer.getRoot()))
          this.mixers = null
        }
        if (this.clock) this.clock = null

        if (this.THREE) this.THREE = null
        if (this._tempTexture && this._tempTexture.gl) {
          this._tempTexture.gl.deleteTexture(this._tempTexture)
          this._tempTexture = null
        }
        if (this._fb && this._fb.gl) {
          this._fb.gl.deleteFramebuffer(this._fb)
          this._fb = null
        }
        if (this._program && this._program.gl) {
          this._program.gl.deleteProgram(this._program)
          this._program = null
        }
        if (this.canvas) this.canvas = null
        if (this.gl) this.gl = null
        if (this.session) this.session = null
        if (this.anchor2DList) this.anchor2DList = []
      },
      initVK() {
        // 初始化 threejs
        this.initTHREE()
        const THREE = this.THREE

        // 自定义初始化
        if (this.init) this.init()

        console.log('this.gl', this.gl)

        this.session = wx.createVKSession({
          track: {
            plane: {
              mode: 1
            },
            depth: {
              mode: 1
            },
          },
          version: 'v2',
          gl: this.gl,
        })
      const session = this.session
        session.start(err => {
          
          if (err) {
            this.setData({
              errMsg:'VK error: ' + err
            })
            return console.error('VK error: ', err)
          }

          console.log('@@@@@@@@ VKSession.version', session.version)

          const canvas = this.canvas

          const calcSize = (width, height, pixelRatio) => {
            console.log(`canvas size: width = ${width} , height = ${height}`)
            this.canvas.width = width * pixelRatio
            this.canvas.height = height * pixelRatio
            this.setData({
              width,
              height,
            })
          }

          session.on('resize', () => {
            const info = wx.getSystemInfoSync()
            calcSize(info.windowWidth, info.windowHeight * 0.8, info.pixelRatio)
          })

          const loader = new THREE.GLTFLoader()
          loader.load('https://dldir1.qq.com/weixin/miniprogram/RobotExpressive_aa2603d917384b68bb4a086f32dabe83.glb', gltf => {
            this.model = {
              scene: gltf.scene,
              animations: gltf.animations,
            }
          })

          this.clock = new THREE.Clock()

          loader.load('https://dldir1.qq.com/weixin/miniprogram/reticle_4b6cc19698ca4a08b31fd3c95ce412ec.glb', gltf => {
            const reticle = this.reticle = gltf.scene

            reticle.visible = false
            this.planeBox.add(reticle)
          })


          // anchor 检测
          const createPlane = size => {
            const geometry = new THREE.PlaneGeometry(size.width, size.height)
            const material = new THREE.MeshBasicMaterial({
              color: 0xffffff,
              side: THREE.DoubleSide,
              transparent: true,
              opacity: 0.5
            })
            const mesh = new THREE.Mesh(geometry, material)
            mesh.rotateX(Math.PI / 2)
            const cnt = new THREE.Object3D()
            cnt.add(mesh)
            this.plane = cnt
            this.plane.width = size.width
            this.plane.height = size.height
            return cnt
          }
          const updateMatrix = (object, m) => {
            object.matrixAutoUpdate = false
            object.matrix.fromArray(m)
          }
          session.on('addAnchors', anchors => {
            anchors.forEach(anchor => {
              const size = anchor.size
              let object
              if (size) {
               //  object = createPlane(size)
                 this.planeBox.add(object)
              } else {
                if (!this.model) {
                  console.warn('this.model 还没加载完成 ！！！！！')
                  return
                }
                  object = new THREE.Object3D()
                  const model = this.getRobot()
                  model.rotateX(-Math.PI / 2)
                  object.add(model)
                  this.robotBox.add(object)
              }

              if(object){
                object._id = anchor.id
                object._size = size
                updateMatrix(object, anchor.transform)
              }
            })
          })
          session.on('updateAnchors', anchors => {
            const map = anchors.reduce((temp, item) => {
              temp[item.id] = item
              return temp
            }, {})
            this.planeBox.children.forEach(object => {
              if (object._id && map[object._id]) {
                const anchor = map[object._id]
                const size = anchor.size
                if (size && object._size && (size.width !== object._size.width || size.height !== object._size.height)) {
                  this.planeBox.remove(object)
                //  object = createPlane(size)
                  this.plane = object
                  this.planeBox.add(object)
                }
                object._id = anchor.id
                object._size = size
                updateMatrix(object, anchor.transform)
              }
            })
          })
          session.on('removeAnchors', anchors => {
            const map = anchors.reduce((temp, item) => {
              temp[item.id] = item
              return temp
            }, {})
            this.planeBox.children.forEach(object => {
              if (object._id && map[object._id]) this.planeBox.remove(object)
            })
            this.robotBox.children.forEach(object => {
              if (object._id && map[object._id]) this.robotBox.remove(object)
            })
          })

          //限制调用帧率
          let fps = 30
          let fpsInterval = 1000 / fps
          let last = Date.now()

          // 逐帧渲染
          const onFrame = timestamp => {
              let now = Date.now()
              const mill = now - last
              // 经过了足够的时间
              if (mill > fpsInterval) {
                  last = now - (mill % fpsInterval); //校正当前时间
                  const frame = session.getVKFrame(canvas.width, canvas.height)
                  if (frame) {
                    try{
                      this.render(frame)
                    }catch(e){
                      console.log(e)
                    }
                  
                  }
              }
              session.requestAnimationFrame(onFrame)
          }
          session.requestAnimationFrame(onFrame)
        })
      },
      initTHREE() {
        const THREE = this.THREE = createScopedThreejs(this.canvas)
        registerGLTFLoader(THREE)

        // 相机
        this.camera = new THREE.Camera()

        // 场景
        const scene = this.scene = new THREE.Scene()
        // 平面集合
        this.robotBox = new THREE.Object3D()
        this.planeBox = new THREE.Object3D()
        scene.add(this.robotBox)

        this.scene2 = new THREE.Scene()
        this.scene2.add(this.planeBox)

        // 光源
        const light1 = new THREE.HemisphereLight(0xffffff, 0x444444) // 半球光
        light1.position.set(0, 0.2, 0)
        scene.add(light1)
        const light2 = new THREE.DirectionalLight(0xffffff) // 平行光
        light2.position.set(0, 0.2, 0.1)
        scene.add(light2)

        // 渲染层
        const renderer = this.renderer = new THREE.WebGLRenderer({
          antialias: true,
          alpha: true
        })
        renderer.gammaOutput = true
        renderer.gammaFactor = 2.2
      },
      updateAnimation() {
        const dt = this.clock.getDelta()
        if (this.mixers) this.mixers.forEach(mixer => mixer.update(dt))
      },
      copyRobot() {
        const THREE = this.THREE
        const {
          scene,
          animations
        } = cloneGltf(this.model, THREE)
        scene.scale.set(0.1, 0.1, 0.1)

        // 动画混合器
        const mixer = new THREE.AnimationMixer(scene)
        for (let i = 0; i < animations.length; i++) {
          const clip = animations[i]
          if (clip.name === 'Dance') {
            const action = mixer.clipAction(clip)
            action.play()
          }
        }

        this.mixers = this.mixers || []
        this.mixers.push(mixer)

        scene._mixer = mixer
        return scene
      },
      getRobot() {
        const THREE = this.THREE

        const model = new THREE.Object3D()
        model.add(this.copyRobot())

        this._insertModels = this._insertModels || []
        this._insertModels.push(model)

        if (this._insertModels.length > 5) {
          const needRemove = this._insertModels.splice(0, this._insertModels.length - 5)
          needRemove.forEach(item => {
            if (item._mixer) {
              const mixer = item._mixer
              this.mixers.splice(this.mixers.indexOf(mixer), 1)
              mixer.uncacheRoot(mixer.getRoot())
            }
            if (item.parent) item.parent.remove(item)
          })
        }
        return model
      },
      onTouchEnd(evt) {
        if(this.reticle.visible){
          //0.05 -0.47 -0.14
          this.hitPosition = this.reticle.position.clone()
          console.log(this.hitPosition)
          
          const model = this.getRobot()
          model.position.copy(this.hitPosition)
          model.rotation.copy(this.reticle.rotation)
          this.robotBox.add(model)
        }
      }
    },
  })
}