Made shadows blurry (thru implementing variance mapping)

samplecode/SampleShadowing.cpp

Index: samplecode/SampleShadowing.cpp
diff --git a/samplecode/SampleShadowing.cpp b/samplecode/SampleShadowing.cpp
index 7b434bca80a5fc5a5be323c4b54f84594e7bc2e4..82bbfac8aa2a82251196eaf12f931d346f5abc64 100644
--- a/samplecode/SampleShadowing.cpp
+++ b/samplecode/SampleShadowing.cpp
@@ -45,6 +45,11 @@ public:
         fMoveLight = false;
 
         fClearShadowMaps = false;
+

[robertphillips, 2016/08/15 23:00:24]

toggling on & off blurry shadows would be cool

[vjiaoblack, 2016/08/16 14:16:40]

Done.

+        fShadowType.fShadowRadius = 2.0f;
+        fShadowType.fBiasingConstant = 0.3f;
+        fShadowType.fMinVariance = 1024;
+        fShadowType.fBlurAlgorithm = SkShadowType::kVariance_BlurAlgorithm;
     }
 
 protected:
@@ -113,13 +118,15 @@ protected:
             for (int i = 0; i < fLights->numLights(); i++) {
                 fLights->light(i).setShadowMap(nullptr);
             }
+
             fSceneChanged = false;
             fLightsChanged = false;
             fClearShadowMaps = false;
-
-            canvas->setLights(fLights);
-            canvas->drawShadowedPicture(fPicture, nullptr, nullptr);
         }
+
+        canvas->setLights(fLights);
+
+        canvas->drawShadowedPicture(fPicture, nullptr, nullptr, fShadowType);
     }
 
     SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) override {
@@ -205,6 +212,8 @@ private:
     bool fSceneChanged;
     bool fLightsChanged;
 
+    SkShadowType fShadowType;
+
     sk_sp<SkLights> fLights;
 
     typedef SampleView INHERITED;