Made shadows blurry (thru implementing variance mapping)

samplecode/SampleShadowing.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SampleCode.h"
 #include "SkPictureRecorder.h"
 #include "SkShadowPaintFilterCanvas.h"
@@ skipping 27 matching lines @@
         fTestRects[2].fDepth = 240;
         fTestRects[2].fGeometry = SkRect::MakeLTRB(100,100,250,250);
 
         fSceneChanged = true;
         fLightsChanged = true;
 
         fSelectedRect = -1;
         fMoveLight = false;
 
         fClearShadowMaps = false;
+
+        fShadowType.fShadowRadius = 2.0f;
+        fShadowType.fBiasingConstant = 0.3f;
+        fShadowType.fMinVariance = 1024;
+        fShadowType.fBlurAlgorithm = SkShadowType::kVariance_BlurAlgorithm;
     }
 
 protected:
     bool onQuery(SkEvent *evt) override {
         if (SampleCode::TitleQ(*evt)) {
             SampleCode::TitleR(evt, "shadowing");
             return true;
         }
 
         SkUnichar uni;
@@ skipping 48 matching lines @@
 
     void onDrawContent(SkCanvas *canvas) override {
         if (fSceneChanged) {
             fPicture = this->makeTestPicture(kWidth, kHeight);
         }
 
         if (fSceneChanged || fLightsChanged || fClearShadowMaps) {
             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 {
         return new SkView::Click(this);
     }
 
     bool onClick(Click *click) override {
         SkScalar x = click->fCurr.fX;
         SkScalar y = click->fCurr.fY;
 
@@ skipping 65 matching lines @@
     } fTestRects[kNumTestRects];
 
     int fSelectedRect;
     bool fMoveLight;
 
     sk_sp<SkPicture> fPicture;
 
     bool fSceneChanged;
     bool fLightsChanged;
 
+    SkShadowType fShadowType;
+
     sk_sp<SkLights> fLights;
 
     typedef SampleView INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 static SkView* MyFactory() { return new ShadowingView; }
 static SkViewRegister reg(MyFactory);
 
 #endif