_setGLContext()

in modules/core/src/lib/deck.js [604:677]

• 55 lines of code
• 5 McCabe index (conditional complexity)

  _setGLContext(gl) {
    if (this.layerManager) {
      return;
    }

    // if external context...
    if (!this.canvas) {
      this.canvas = gl.canvas;
      instrumentGLContext(gl, {enable: true, copyState: true});
    }

    this.tooltip = new Tooltip(this.canvas);

    setParameters(gl, {
      blend: true,
      blendFunc: [GL.SRC_ALPHA, GL.ONE_MINUS_SRC_ALPHA, GL.ONE, GL.ONE_MINUS_SRC_ALPHA],
      polygonOffsetFill: true,
      depthTest: true,
      depthFunc: GL.LEQUAL
    });

    this.props.onWebGLInitialized(gl);

    // timeline for transitions
    const timeline = new Timeline();
    timeline.play();
    this.animationLoop.attachTimeline(timeline);

    this.eventManager = new EventManager(this.props.parent || gl.canvas, {
      touchAction: this.props.touchAction,
      events: {
        pointerdown: this._onPointerDown,
        pointermove: this._onPointerMove,
        pointerleave: this._onPointerMove
      }
    });
    for (const eventType in EVENTS) {
      this.eventManager.on(eventType, this._onEvent);
    }

    this.viewManager = new ViewManager({
      timeline,
      eventManager: this.eventManager,
      onViewStateChange: this._onViewStateChange,
      onInteractiveStateChange: this._onInteractiveStateChange,
      views: this._getViews(),
      viewState: this._getViewState(),
      width: this.width,
      height: this.height
    });

    // viewManager must be initialized before layerManager
    // layerManager depends on viewport created by viewManager.
    const viewport = this.viewManager.getViewports()[0];

    // Note: avoid React setState due GL animation loop / setState timing issue
    this.layerManager = new LayerManager(gl, {
      deck: this,
      stats: this.stats,
      viewport,
      timeline
    });

    this.effectManager = new EffectManager();

    this.deckRenderer = new DeckRenderer(gl);

    this.deckPicker = new DeckPicker(gl);

    this.setProps(this.props);

    this._updateCanvasSize();
    this.props.onLoad();
  }