constructor RenderContextWebGL

Source

RenderContextWebGL(CanvasElement canvasElement, {
  bool alpha: false, bool antialias: false }) : _canvasElement = canvasElement {

  _canvasElement.onWebGlContextLost.listen(_onContextLost);
  _canvasElement.onWebGlContextRestored.listen(_onContextRestored);

  var renderingContext = _canvasElement.getContext3d(
      alpha: alpha, antialias: antialias,
      depth: false, stencil: true,
      premultipliedAlpha: true, preserveDrawingBuffer: false);

  if (renderingContext is! gl.RenderingContext) {
    throw new StateError("Failed to get WebGL context.");
  }

  _renderingContext = renderingContext;
  _renderingContext.enable(gl.BLEND);
  _renderingContext.disable(gl.STENCIL_TEST);
  _renderingContext.disable(gl.DEPTH_TEST);
  _renderingContext.disable(gl.CULL_FACE);
  _renderingContext.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, 1);
  _renderingContext.blendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA);

  _activeRenderProgram = renderProgramSimple;
  _activeRenderProgram.activate(this);

  _contextValid = true;
  _contextIdentifier = ++_globalContextIdentifier;

  this.reset();
}