Use frame state for pixel to coord conversion

src/ol/renderer/webgl/webglvectorlayerrenderer.js

@@ -9,6 +9,7 @@ goog.require('ol.layer.Vector');
 goog.require('ol.render.webgl.ReplayGroup');
 goog.require('ol.renderer.vector');
 goog.require('ol.renderer.webgl.Layer');
+goog.require('ol.vec.Mat4');
 
 
 
@@ -165,7 +166,9 @@ ol.renderer.webgl.VectorLayer.prototype.hasFeatureAtCoordinate =
  */
 ol.renderer.webgl.VectorLayer.prototype.forEachLayerAtPixel =
     function(pixel, frameState, callback, thisArg) {
-  var coordinate = this.getMap().getCoordinateFromPixel(pixel);
+  var coordinate = pixel.slice();
+  ol.vec.Mat4.multVec2(
+      frameState.pixelToCoordinateMatrix, coordinate, coordinate);
   var hasFeature = this.hasFeatureAtCoordinate(coordinate, frameState);
 
   if (hasFeature) {