Implement hasFeatureAtPixel for webgl

src/ol/renderer/webgl/webglmaprenderer.js

@@ -601,6 +601,53 @@ ol.renderer.webgl.Map.prototype.forEachFeatureAtPixel =
 };
 
 
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.Map.prototype.hasFeatureAtPixel =
+    function(coordinate, frameState, layerFilter, thisArg2) {
+  var hasFeature = false;
+
+  if (this.getGL().isContextLost()) {
+    return false;
+  }
+
+  var context = this.getContext();
+  var viewState = frameState.viewState;
+
+  // do the hit-detection for the overlays first
+  if (!goog.isNull(this.replayGroup)) {
+    // use default color values
+    var d = ol.renderer.webgl.Map.DEFAULT_COLOR_VALUES_;
+
+    hasFeature = this.replayGroup.hasFeatureAtPixel(context,
+        viewState.center, viewState.resolution, viewState.rotation,
+        frameState.size, frameState.pixelRatio,
+        d.opacity, d.brightness, d.contrast, d.hue, d.saturation, {},
+        coordinate);
+    if (hasFeature) {
+      return true;
+    }
+  }
+  var layerStates = this.getMap().getLayerGroup().getLayerStatesArray();
+  var numLayers = layerStates.length;
+  var i;
+  for (i = numLayers - 1; i >= 0; --i) {
+    var layerState = layerStates[i];
+    var layer = layerState.layer;
+    if (ol.layer.Layer.visibleAtResolution(layerState, viewState.resolution) &&
+        layerFilter.call(thisArg2, layer)) {
+      var layerRenderer = this.getLayerRenderer(layer);
+      hasFeature = layerRenderer.hasFeatureAtPixel(coordinate, frameState);
+      if (hasFeature) {
+        return true;
+      }
+    }
+  }
+  return hasFeature;
+};
+
+
 /**
  * @private
  */

src/ol/renderer/webgl/webglvectorlayerrenderer.js

@@ -140,6 +140,28 @@ ol.renderer.webgl.VectorLayer.prototype.forEachFeatureAtPixel =
 };
 
 
+/**
+ * @inheritDoc
+ */
+ol.renderer.webgl.VectorLayer.prototype.hasFeatureAtPixel =
+    function(coordinate, frameState) {
+  if (goog.isNull(this.replayGroup_) || goog.isNull(this.layerState_)) {
+    return false;
+  } else {
+    var mapRenderer = this.getWebGLMapRenderer();
+    var context = mapRenderer.getContext();
+    var viewState = frameState.viewState;
+    var layerState = this.layerState_;
+    return this.replayGroup_.hasFeatureAtPixel(context,
+        viewState.center, viewState.resolution, viewState.rotation,
+        frameState.size, frameState.pixelRatio,
+        layerState.opacity, layerState.brightness, layerState.contrast,
+        layerState.hue, layerState.saturation, frameState.skippedFeatureUids,
+        coordinate);
+  }
+};
+
+
 /**
  * Handle changes in image style state.
  * @param {goog.events.Event} event Image style change event.