/* global alert */

class Screen {
  constructor () {
    this._el = document.createElement('canvas')
    this.resize()
    this._gl = this._el.getContext('webgl')

    if (!this._gl) {
      alert('Your machine or browser does not support WebGL!')
      return
    }

    document.body.appendChild(this._el)

    window.addEventListener('resize', (e) => {
      this.resize()
    }, false)
  }

  get gl () {
    return this._gl
  }

  get ctx () {
    return this._gl
  }

  resize () {
    this._el.width = window.innerWidth
    this._el.height = window.innerHeight
  }
}

export default Screen