konva/test/performance/konva.webgl.js

Konva.WebGLLayer = function(config) {
  this.nodeType = 'Layer';
  this.canvas = new Konva.SceneWebGLCanvas();
  this.hitCanvas = new Konva.HitCanvas({
    pixelRatio: 1
  });
  // call super constructor
  Konva.BaseLayer.call(this, config);
};

Konva.Util.extend(Konva.WebGLLayer, Konva.Layer);

Konva.SceneWebGLCanvas = function(config) {
  var conf = config || {};
  var width = conf.width || 0,
    height = conf.height || 0;

  Konva.Canvas.call(this, conf);
  WebGL2D.enable(this._canvas);
  this.context = new Konva.SceneWebGLContext(this);
  this.setSize(width, height);
};

Konva.Util.extend(Konva.SceneWebGLCanvas, Konva.SceneCanvas);

Konva.SceneWebGLContext = function(canvas) {
  this.canvas = canvas;
  this._context = canvas._canvas.getContext('webgl-2d');

  if (Konva.enableTrace) {
    this.traceArr = [];
    this._enableTrace();
  }
};

Konva.Util.extend(Konva.SceneWebGLContext, Konva.SceneContext);