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      1 
      2 /*
      3  * Copyright 2015 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 
      9 #ifndef SkLight_DEFINED
     10 #define SkLight_DEFINED
     11 
     12 #include "SkPoint3.h"
     13 
     14 class SK_API SkLight {
     15 public:
     16     enum LightType {
     17         kAmbient_LightType,       // only 'fColor' is used
     18         kDirectional_LightType
     19     };
     20 
     21     SkLight() : fType(kAmbient_LightType) {
     22         fColor.set(0.0f, 0.0f, 0.0f);
     23         fDirection.set(0.0f, 0.0f, 1.0f);
     24     }
     25 
     26     SkLight(const SkColor3f& color)
     27         : fType(kAmbient_LightType)
     28         , fColor(color) {
     29         fDirection.set(0.0f, 0.0f, 1.0f);
     30     }
     31 
     32     SkLight(const SkColor3f& color, const SkVector3& dir)
     33         : fType(kDirectional_LightType)
     34         , fColor(color)
     35         , fDirection(dir) {
     36         if (!fDirection.normalize()) {
     37             fDirection.set(0.0f, 0.0f, 1.0f);
     38         }
     39     }
     40 
     41     LightType type() const { return fType; }
     42     const SkColor3f& color() const { return fColor; }
     43     const SkVector3& dir() const {
     44         SkASSERT(kAmbient_LightType != fType);
     45         return fDirection;
     46     }
     47 
     48 private:
     49     LightType   fType;
     50     SkColor3f   fColor;           // linear (unpremul) color. Range is 0..1 in each channel.
     51     SkVector3   fDirection;       // direction towards the light (+Z is out of the screen).
     52                                   // If degenerate, it will be replaced with (0, 0, 1).
     53 };
     54 
     55 
     56 #endif
     57