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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 class SkNormalSource; | |
16 | 17 |
17 class SK_API SkLightingShader { | 18 class SK_API SkLightingShader { |
18 public: | 19 public: |
robertphillips
2016/07/06 16:36:33
"map and normals with" -> "map using the normals a
dvonbeck
2016/07/06 18:07:48
Done.
| |
19 /** Returns a shader that lights the diffuse and normal maps with a set of l ights. | 20 /** Returns a shader that lights the diffuse map and normals with a set of l ights. |
20 | 21 |
21 It returns a shader with a reference count of 1. | 22 It returns a shader with a reference count of 1. |
22 The caller should decrement the shader's reference count when done with the shader. | 23 The caller should decrement the shader's reference count when done with the shader. |
23 It is an error for count to be < 2. | 24 It is an error for count to be < 2. |
24 @param diffuse the diffuse bitmap | 25 @param diffuse the diffuse bitmap |
25 @param normal the normal map | |
26 @param lights the lights applied to the normal map | 26 @param lights the lights applied to the normal map |
27 @param invNormRotation rotation applied to the normal map's normals | |
28 @param diffLocalMatrix the local matrix for the diffuse map (transform from | 27 @param diffLocalMatrix the local matrix for the diffuse map (transform from |
29 texture coordinates to shape source coordinates) . nullptr is | 28 texture coordinates to shape source coordinates) . nullptr is |
30 interpreted as an identity matrix. | 29 interpreted as an identity matrix. |
31 @param normLocalMatrix the local matrix for the normal map (transform f rom | 30 @param normalSource the source for the normals |
32 texture coordinates to shape source coordinates) . nullptr is | |
33 interpreted as an identity matrix. | |
34 | 31 |
35 nullptr will be returned if: | 32 nullptr will be returned if: |
36 either 'diffuse' or 'normal' are empty | 33 'diffuse' is empty |
37 either 'diffuse' or 'normal' are too big (> 65535 on a side) | 34 'diffuse' is too big (> 65535 on any side) |
38 'diffuse' and 'normal' aren't the same size | |
39 | 35 |
40 The lighting equation is currently: | 36 The lighting equation is currently: |
41 result = LightColor * DiffuseColor * (Normal * LightDir) + AmbientCo lor | 37 result = LightColor * DiffuseColor * (Normal * LightDir) + AmbientCo lor |
42 | 38 |
43 The normal map is currently assumed to be an 8888 image where the normal at a texel | |
44 is retrieved by: | |
45 N.x = R-127; | |
46 N.y = G-127; | |
47 N.z = B-127; | |
48 N.normalize(); | |
49 The +Z axis is thus encoded in RGB as (127, 127, 255) while the -Z axis is | |
50 (127, 127, 0). | |
51 */ | 39 */ |
52 static sk_sp<SkShader> Make(const SkBitmap& diffuse, const SkBitmap& normal, | 40 static sk_sp<SkShader> Make(const SkBitmap& diffuse, sk_sp<SkLights> lights, |
53 sk_sp<SkLights> lights, const SkVector& invNormR otation, | 41 const SkMatrix* diffLocalMatrix, |
54 const SkMatrix* diffLocalMatrix, const SkMatrix* normLocalMatrix); | 42 sk_sp<SkNormalSource> normalSource); |
55 | 43 |
56 SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP() | 44 SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP() |
57 }; | 45 }; |
58 | 46 |
59 #endif | 47 #endif |
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