function CombineMaterial() {
	    var _this;

	    var screenMode = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;

	    classCallCheck(this, CombineMaterial);

	    _this = possibleConstructorReturn(this, getPrototypeOf$2(CombineMaterial).call(this, {
	      type: "CombineMaterial",
	      uniforms: {
	        texture1: new Uniform(null),
	        texture2: new Uniform(null),
	        opacity1: new Uniform(1.0),
	        opacity2: new Uniform(1.0)
	      },
	      fragmentShader: fragment$3,
	      vertexShader: vertex$3,
	      depthWrite: false,
	      depthTest: false
	    }));

	    _this.setScreenModeEnabled(screenMode);

	    return _this;
	  }
Constructs a new combine material.

@param {Boolean} [screenMode=false] - Whether the screen blend mode should be used.