made point light shadows

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"
 #include "SkShadowShader.h"
 #include "SkSurface.h"
 
 #ifdef SK_EXPERIMENTAL_SHADOWING
 
 class ShadowingView : public SampleView {
 public:
     ShadowingView()
         : fSceneChanged(true)
         , fLightsChanged(true)
         , fMoveLight(false)
         , fClearShadowMaps(false)
         , fSelectedRectID(-1)
         , fSelectedSliderID(-1)
-        , fLightDepth(600.0f)  {
+        , fLightDepth(400.0f)  {
         this->setBGColor(0xFFCCCCCC);
 
-        this->updateLights(200, 200);
+        this->updateLights(100, 100);
 
         fTestRects[0].fColor = 0xFFEE8888;
         fTestRects[0].fDepth = 80;
         fTestRects[0].fGeometry = SkRect::MakeLTRB(200,150,350,300);
 
         fTestRects[1].fColor = 0xFF88EE88;
         fTestRects[1].fDepth = 160;
         fTestRects[1].fGeometry = SkRect::MakeLTRB(150,200,300,350);
 
         fTestRects[2].fColor = 0xFF8888EE;
         fTestRects[2].fDepth = 240;
         fTestRects[2].fGeometry = SkRect::MakeLTRB(100,100,250,250);
 
         fSliders[0].fGeometry = SkRect::MakeLTRB(20, 400, 30, 420);
         fSliders[0].fOffset = 0.0f;
         fSliders[0].fScale = 0.1f;
 
         fSliders[1].fGeometry = SkRect::MakeLTRB(100, 420, 110, 440);
         fSliders[1].fOffset = 0.0f;
         fSliders[1].fScale = 10.0f;
 
         fSliders[2].fGeometry = SkRect::MakeLTRB(0, 440, 10, 460);
         fSliders[2].fOffset = 0.0f;
         fSliders[2].fScale = 0.0025f;
 
         fShadowParams.fShadowRadius = 4.0f;
         fShadowParams.fBiasingConstant = 0.3f;
-        fShadowParams.fMinVariance = 1024;
+        fShadowParams.fMinVariance = 2048; // we need a higher min variance for point lights
         fShadowParams.fType = SkShadowParams::kVariance_ShadowType;
     }
 
 protected:
     bool onQuery(SkEvent *evt) override {
         if (SampleCode::TitleQ(*evt)) {
             SampleCode::TitleR(evt, "shadowing");
             return true;
         }
 
@@ skipping 88 matching lines @@
             canvas->drawRect(fSliders[i].fGeometry, paint);
         }
     }
 
     SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) override {
         return new SkView::Click(this);
     }
 
     void updateLights(int x, int y) {
         SkLights::Builder builder;
+        builder.setAmbientLightColor(SkColor3f::Make(0.2f, 0.2f, 0.2f));
         builder.add(SkLights::Light::MakePoint(SkColor3f::Make(0.2f, 0.4f, 0.6f),
                                                SkVector3::Make(x - 50,
                                                                350 - y,
                                                                fLightDepth),
                                                100000));
         builder.add(SkLights::Light::MakePoint(SkColor3f::Make(0.6f, 0.4f, 0.2f),
                                                SkVector3::Make(x + 50,
                                                                450 - y,
                                                                fLightDepth),
                                                100000));
-        builder.add(SkLights::Light::MakeDirectional(SkColor3f::Make(0.2f, 0.2f, 0.2f),
-                                                     SkVector3::Make(0.2f, 0.2f, 1.0f)));
         fLights = builder.finish();
     }
 
     void updateFromSelectedSlider() {
         SkScalar newValue = fSliders[fSelectedSliderID].fGeometry.fLeft *
                             fSliders[fSelectedSliderID].fScale +
                             fSliders[fSelectedSliderID].fOffset;
 
         switch (fSelectedSliderID) {
             case 0:
@@ skipping 112 matching lines @@
     sk_sp<SkLights> fLights;
 
     typedef SampleView INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 static SkView* MyFactory() { return new ShadowingView; }
 static SkViewRegister reg(MyFactory);
 
 #endif