comments for PointCloudShading.isSupported

Author: likangning93

Source/Scene/PointCloudShading.js

@@ -76,7 +76,15 @@ define([
         this.eyeDomeLightingRadius = defaultValue(pointCloudShading.eyeDomeLightingRadius, 1.0);
     }
 
-    PointCloudShading.isSupported = PointCloudEyeDomeLighting.isSupported;
+    /**
+     * Determines if point cloud shading is supported.
+     *
+     * @param {Scene} scene The scene.
+     * @returns {Boolean} <code>true</code> if point  cloud shading is supported; otherwise, returns <code>false</code>
+     */
+    PointCloudShading.isSupported = function(scene) {
+        return PointCloudEyeDomeLighting.isSupported(scene.context);
+    }
 
     return PointCloudShading;
 });

Specs/Scene/PointCloudShadingSpec.js

@@ -1,7 +1,9 @@
 defineSuite([
-        'Scene/PointCloudShading'
+        'Scene/PointCloudShading',
+        'Specs/createScene'
     ], function(
-        PointCloudShading) {
+        PointCloudShading,
+        createScene) {
     'use strict';
 
     it('creates expected instance from raw assignment and construction', function() {
@@ -30,4 +32,12 @@ defineSuite([
         expect(pointCloudShading.eyeDomeLightingStrength).toEqual(options.eyeDomeLightingStrength);
         expect(pointCloudShading.eyeDomeLightingRadius).toEqual(options.eyeDomeLightingRadius);
     });
+
+    it('provides a method for checking if point cloud shading is supported', function() {
+        var scene = createScene();
+        var context = scene.context;
+        var expectedSupport = context.floatingPointTexture && context.drawBuffers && context.fragmentDepth;
+        expect(PointCloudShading.isSupported(scene)).toEqual(expectedSupport);
+        scene.destroyForSpecs();
+    });
 });