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1 /* | 1 /* |
2 * Copyright 2015 Google Inc. | 2 * Copyright 2015 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #ifndef SkLightingShader_DEFINED | 8 #ifndef SkLightingShader_DEFINED |
9 #define SkLightingShader_DEFINED | 9 #define SkLightingShader_DEFINED |
10 | 10 |
11 #include "SkLights.h" | 11 #include "SkLights.h" |
12 #include "SkShader.h" | 12 #include "SkShader.h" |
13 | 13 |
14 class SkBitmap; | 14 class SkBitmap; |
15 class SkMatrix; | 15 class SkMatrix; |
16 | 16 |
17 class SK_API SkLightingShader { | 17 class SK_API SkLightingShader { |
18 public: | 18 public: |
19 /** Abstract class that generates or reads in normals for use by SkLightingS
hader. Currently | |
20 implements the GPU side only. Not to be used as part of the API yet. Use
d internally by | |
21 SkLightingShader. | |
22 */ | |
23 class NormalSource : public SkFlattenable { | |
24 public: | |
25 virtual ~NormalSource(); | |
26 | |
27 #if SK_SUPPORT_GPU | |
28 | |
29 /** Returns a fragment processor that takes no input and outputs a norma
l (already rotated) | |
30 as its output color. To be used as a child fragment processor. | |
31 */ | |
32 virtual sk_sp<GrFragmentProcessor> asFragmentProcessor( | |
33 GrContext* context, | |
34 const SkMatrix& viewM, | |
35 const SkMatrix* localMatrix, | |
36 SkFilterQuality filterQuality, | |
37 SkSourceGammaTreatment gammaTreatment) const = 0; | |
38 #endif | |
39 | |
40 SK_DEFINE_FLATTENABLE_TYPE(NormalSource) | |
41 }; | |
42 | |
43 /** Returns a normal source that provides normals sourced from the the norma
l map argument. | |
44 Not to be used as part of the API yet. Used internally by SkLightingShad
er. | |
45 | |
46 @param normal the normal map | |
47 @param invNormRotation rotation applied to the normal map's norma
ls | |
48 @param normLocalM the local matrix for the normal map | |
49 | |
50 nullptr will be returned if | |
51 'normal' is empty | |
52 'normal' too big (> 65535 on either side) | |
53 | |
54 The normal map is currently assumed to be an 8888 image where the normal
at a texel | |
55 is retrieved by: | |
56 N.x = R-127; | |
57 N.y = G-127; | |
58 N.z = B-127; | |
59 N.normalize(); | |
60 The +Z axis is thus encoded in RGB as (127, 127, 255) while the -Z axis
is | |
61 (127, 127, 0). | |
62 */ | |
63 class NormalMapSource { | |
64 public: | |
65 static sk_sp<NormalSource> Make(const SkBitmap& normal, const SkVector&
invNormRotation, | |
66 const SkMatrix* normLocalM); | |
67 | |
68 SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP() | |
69 }; | |
70 | |
71 /** Returns a shader that lights the diffuse and normal maps with a set of l
ights. | 19 /** Returns a shader that lights the diffuse and normal maps with a set of l
ights. |
72 | 20 |
73 It returns a shader with a reference count of 1. | 21 It returns a shader with a reference count of 1. |
74 The caller should decrement the shader's reference count when done with
the shader. | 22 The caller should decrement the shader's reference count when done with
the shader. |
75 It is an error for count to be < 2. | 23 It is an error for count to be < 2. |
76 @param diffuse the diffuse bitmap | 24 @param diffuse the diffuse bitmap |
77 @param normal the normal map | 25 @param normal the normal map |
78 @param lights the lights applied to the normal map | 26 @param lights the lights applied to the normal map |
79 @param invNormRotation rotation applied to the normal map's normals | 27 @param invNormRotation rotation applied to the normal map's normals |
80 @param diffLocalMatrix the local matrix for the diffuse texture | 28 @param diffLocalMatrix the local matrix for the diffuse texture |
(...skipping 17 matching lines...) Expand all Loading... |
98 (127, 127, 0). | 46 (127, 127, 0). |
99 */ | 47 */ |
100 static sk_sp<SkShader> Make(const SkBitmap& diffuse, const SkBitmap& normal, | 48 static sk_sp<SkShader> Make(const SkBitmap& diffuse, const SkBitmap& normal, |
101 sk_sp<SkLights> lights, const SkVector& invNormR
otation, | 49 sk_sp<SkLights> lights, const SkVector& invNormR
otation, |
102 const SkMatrix* diffLocalMatrix, const SkMatrix*
normLocalMatrix); | 50 const SkMatrix* diffLocalMatrix, const SkMatrix*
normLocalMatrix); |
103 | 51 |
104 SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP() | 52 SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP() |
105 }; | 53 }; |
106 | 54 |
107 #endif | 55 #endif |
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