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1 /* | |
2 * Copyright 2016 Google Inc. | |
3 * | |
4 * Use of this source code is governed by a BSD-style license that can be | |
5 * found in the LICENSE file. | |
6 */ | |
7 | |
8 #ifndef SkNormalSource_DEFINED | |
9 #define SkNormalSource_DEFINED | |
10 | |
11 #include "SkFlattenable.h" | |
12 | |
13 /** Abstract class that generates or reads in normals for use by SkLightingShade r. Not to be | |
14 used as part of the API yet. Used internally by SkLightingShader. | |
15 */ | |
16 class SK_API SkNormalSource : public SkFlattenable { | |
17 public: | |
18 virtual ~SkNormalSource(); | |
reed1
2016/06/27 14:28:20
nit: ~SkNormalSource() override;
dvonbeck
2016/06/27 15:18:09
Done.
| |
19 | |
20 #if SK_SUPPORT_GPU | |
21 /** Returns a fragment processor that takes no input and outputs a normal (a lready rotated) | |
22 as its output color. To be used as a child fragment processor. | |
23 */ | |
24 virtual sk_sp<GrFragmentProcessor> asFragmentProcessor( | |
25 GrContext* context, | |
26 const SkMatrix& viewM, | |
27 const SkMatrix* localMatrix, | |
28 SkFilterQuality filterQuality, | |
29 SkSourceGammaTreatment gammaTreatment) const = 0; | |
30 #endif | |
31 | |
32 class Provider { | |
33 public: | |
34 virtual ~Provider() {}; | |
35 | |
36 /** Called for each span of the object being drawn on the CPU. Your subc lass should set | |
37 the appropriate normals that correspond to the specified device coor dinates. | |
38 */ | |
39 virtual void fillScanLine(int x, int y, SkPoint3 output[], int count) co nst = 0; | |
40 }; | |
41 | |
42 /** Returns an instance of 'Provider' that provides normals for the CPU pipe line. The | |
43 necessary data will be initialized in place at 'storage'. | |
44 */ | |
45 virtual Provider* asProvider(const SkShader::ContextRec&, void* storage) con st = 0; | |
46 | |
47 /** Amount of memory needed to store a provider object and its dependencies. | |
48 */ | |
49 virtual size_t providerSize(const SkShader::ContextRec&) const = 0; | |
50 | |
51 /** Returns a normal source that provides normals sourced from the the norma l map argument. | |
52 Not to be used as part of the API yet. Used internally by SkLightingShad er. | |
53 | |
54 @param map a shader that outputs the normal map | |
55 @param normRotation rotation applied to the normal map's normals, i n the | |
56 [cos a, sin a] form. | |
57 | |
58 nullptr will be returned if 'map' is null | |
59 | |
60 The normal map is currently assumed to be an 8888 image where the normal at a texel | |
61 is retrieved by: | |
62 N.x = R-127; | |
63 N.y = G-127; | |
64 N.z = B-127; | |
65 N.normalize(); | |
66 The +Z axis is thus encoded in RGB as (127, 127, 255) while the -Z axis is | |
67 (127, 127, 0). | |
68 */ | |
69 static sk_sp<SkNormalSource> MakeFromNormalMap(sk_sp<SkShader> map, | |
70 const SkVector& normRotation) ; | |
71 | |
72 SK_DEFINE_FLATTENABLE_TYPE(SkNormalSource) | |
73 SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP() | |
74 }; | |
75 | |
76 #endif | |
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