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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 SkLights_DEFINED |
| 10 #define SkLights_DEFINED |
| 11 |
| 12 #include "SkPoint3.h" |
| 13 #include "SkRefCnt.h" |
| 14 #include "../private/SkTDArray.h" |
| 15 |
| 16 class SK_API SkLights : public SkRefCnt { |
| 17 public: |
| 18 class Light { |
| 19 public: |
| 20 enum LightType { |
| 21 kAmbient_LightType, // only 'fColor' is used |
| 22 kDirectional_LightType |
| 23 }; |
| 24 |
| 25 Light(const SkColor3f& color) |
| 26 : fType(kAmbient_LightType) |
| 27 , fColor(color) { |
| 28 fDirection.set(0.0f, 0.0f, 1.0f); |
| 29 } |
| 30 |
| 31 Light(const SkColor3f& color, const SkVector3& dir) |
| 32 : fType(kDirectional_LightType) |
| 33 , fColor(color) |
| 34 , fDirection(dir) { |
| 35 if (!fDirection.normalize()) { |
| 36 fDirection.set(0.0f, 0.0f, 1.0f); |
| 37 } |
| 38 } |
| 39 |
| 40 LightType type() const { return fType; } |
| 41 const SkColor3f& color() const { return fColor; } |
| 42 const SkVector3& dir() const { |
| 43 SkASSERT(kAmbient_LightType != fType); |
| 44 return fDirection; |
| 45 } |
| 46 |
| 47 private: |
| 48 LightType fType; |
| 49 SkColor3f fColor; // linear (unpremul) color. Range is 0..1
in each channel. |
| 50 SkVector3 fDirection; // direction towards the light (+Z is out
of the screen). |
| 51 // If degenerate, it will be replaced with
(0, 0, 1). |
| 52 }; |
| 53 |
| 54 class Builder { |
| 55 public: |
| 56 Builder() : fLights(new SkLights) { } |
| 57 |
| 58 void add(const Light& light) { |
| 59 if (fLights) { |
| 60 *fLights->fLights.push() = light; |
| 61 } |
| 62 } |
| 63 |
| 64 const sk_sp<SkLights> finish() { |
| 65 return fLights; |
| 66 } |
| 67 |
| 68 private: |
| 69 sk_sp<SkLights> fLights; |
| 70 }; |
| 71 |
| 72 int numLights() const { |
| 73 return fLights.count(); |
| 74 } |
| 75 |
| 76 const Light& light(int index) const { |
| 77 return fLights[index]; |
| 78 } |
| 79 |
| 80 private: |
| 81 SkLights() {} |
| 82 |
| 83 SkTDArray<Light> fLights; |
| 84 }; |
| 85 |
| 86 #endif |
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