pages235/renderer/viewer/lib/viewerWrapper.ts

import * as THREE from 'three'
import { statsEnd, statsStart } from '../../../src/topRightStats'

// wrapper for now
export class ViewerWrapper {
  previousWindowWidth: number
  previousWindowHeight: number
  globalObject = globalThis as any
  stopRenderOnBlur = false
  addedToPage = false
  renderInterval = 0
  renderIntervalUnfocused: number | undefined
  fpsInterval

  constructor (public canvas: HTMLCanvasElement, public renderer?: THREE.WebGLRenderer) {
    if (this.renderer) this.globalObject.renderer = this.renderer
  }

  addToPage (startRendering = true) {
    if (this.addedToPage) throw new Error('Already added to page')
    let pixelRatio = window.devicePixelRatio || 1 // todo this value is too high on ios, need to check, probably we should use avg, also need to make it configurable
    if (this.renderer) {
      if (!this.renderer.capabilities.isWebGL2) pixelRatio = 1 // webgl1 has issues with high pixel ratio (sometimes screen is clipped)
      this.renderer.setPixelRatio(pixelRatio)
      this.renderer.setSize(window.innerWidth, window.innerHeight)
    } else {
      this.canvas.width = window.innerWidth * pixelRatio
      this.canvas.height = window.innerHeight * pixelRatio
    }
    this.previousWindowWidth = window.innerWidth
    this.previousWindowHeight = window.innerHeight

    this.canvas.id = 'viewer-canvas'
    document.body.appendChild(this.canvas)

    this.addedToPage = true

    let max = 0
    this.fpsInterval = setInterval(() => {
      if (max > 0) {
        viewer.world.droppedFpsPercentage = this.renderedFps / max
      }
      max = Math.max(this.renderedFps, max)
      this.renderedFps = 0
    }, 1000)
    if (startRendering) {
      this.globalObject.requestAnimationFrame(this.render.bind(this))
    }
    if (typeof window !== 'undefined') {
      this.trackWindowFocus()
    }
  }

  windowFocused = true
  trackWindowFocus () {
    window.addEventListener('focus', () => {
      this.windowFocused = true
    })
    window.addEventListener('blur', () => {
      this.windowFocused = false
    })
  }

  dispose () {
    if (!this.addedToPage) throw new Error('Not added to page')
    this.canvas.remove()
    this.renderer?.dispose()
    // this.addedToPage = false
    clearInterval(this.fpsInterval)
  }


  renderedFps = 0
  lastTime = performance.now()
  delta = 0
  preRender = () => { }
  postRender = () => { }
  render (time: DOMHighResTimeStamp) {
    if (this.globalObject.stopLoop) return
    for (const fn of beforeRenderFrame) fn()
    this.globalObject.requestAnimationFrame(this.render.bind(this))
    if (!viewer || this.globalObject.stopRender || this.renderer?.xr.isPresenting || (this.stopRenderOnBlur && !this.windowFocused)) return
    const renderInterval = (this.windowFocused ? this.renderInterval : this.renderIntervalUnfocused) ?? this.renderInterval
    if (renderInterval) {
      this.delta += time - this.lastTime
      this.lastTime = time
      if (this.delta > renderInterval) {
        this.delta %= renderInterval
        // continue rendering
      } else {
        return
      }
    }
    this.preRender()
    statsStart()
    // ios bug: viewport dimensions are updated after the resize event
    if (this.previousWindowWidth !== window.innerWidth || this.previousWindowHeight !== window.innerHeight) {
      this.resizeHandler()
      this.previousWindowWidth = window.innerWidth
      this.previousWindowHeight = window.innerHeight
    }
    viewer.render()
    this.renderedFps++
    statsEnd()
    this.postRender()
  }

  resizeHandler () {
    const width = window.innerWidth
    const height = window.innerHeight

    viewer.camera.aspect = width / height
    viewer.camera.updateProjectionMatrix()

    if (this.renderer) {
      this.renderer.setSize(width, height)
    }
    viewer.world.handleResize()
  }
}