Moved ambient lights out of SkLight's light array

samplecode/SampleShadowing.cpp

Index: samplecode/SampleShadowing.cpp
diff --git a/samplecode/SampleShadowing.cpp b/samplecode/SampleShadowing.cpp
index 4892f9c27df5c97eb27bd38175a2f59ac5082aac..d3434f3fee200a994c7b0a1771331ca10fdd8efd 100644
--- a/samplecode/SampleShadowing.cpp
+++ b/samplecode/SampleShadowing.cpp
@@ -160,19 +160,21 @@ protected:
     }
 
     void updateLights(int x, int y) {

[robertphillips, 2016/08/26 19:45:00]

I'm okay with this change but don't you want to keep the old point light
behavior ?

[vjiaoblack, 2016/08/28 20:11:56]

Mmmm..... I was going to do another pass and fix it later, but then I guess
point lights already landed. 

I'll keep the old one.

+        float recipX = 1.0f / kWidth;
+        float recipY = 1.0f / kHeight;
+
         SkLights::Builder builder;
-        builder.add(SkLights::Light::MakePoint(SkColor3f::Make(0.2f, 0.4f, 0.6f),
-                                               SkVector3::Make(x - 50,
-                                                               350 - y,
-                                                               fLightDepth),
-                                               1024));
-        builder.add(SkLights::Light::MakePoint(SkColor3f::Make(0.6f, 0.4f, 0.2f),
-                                               SkVector3::Make(x + 50,
-                                                               450 - y,
-                                                               fLightDepth),
-                                               1024));
-        builder.add(SkLights::Light::MakeDirectional(SkColor3f::Make(0.2f, 0.2f, 0.2f),
-                                                     SkVector3::Make(0.2f, 0.2f, 1.0f)));
+        builder.add(SkLights::Light::MakeDirectional(
+                SkColor3f::Make(0.2f, 0.3f, 0.4f),
+                SkVector3::Make(0.2f + (200.0f - x) * recipX,
+                                0.05f + (200.0f - y) * recipY,
+                                1.0f)));
+        builder.add(SkLights::Light::MakeDirectional(
+                SkColor3f::Make(0.4f, 0.3f, 0.2f),
+                SkVector3::Make(0.05f + (200.0f - x) * recipX,
+                                0.2f + (200.0f - y) * recipY,
+                                1.0f)));
+        builder.setAmbientLightColor(SkColor3f::Make(0.4f, 0.4f, 0.4f));
         fLights = builder.finish();
     }