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1 /* | 1 /* |
2 * Copyright 2012 Google Inc. | 2 * Copyright 2012 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 GrGLEffectMatrix_DEFINED | 8 #ifndef GrGLEffectMatrix_DEFINED |
9 #define GrGLEffectMatrix_DEFINED | 9 #define GrGLEffectMatrix_DEFINED |
10 | 10 |
11 #include "GrGLEffect.h" | 11 #include "GrGLEffect.h" |
12 #include "SkMatrix.h" | 12 #include "SkMatrix.h" |
13 | 13 |
14 class GrTexture; | 14 class GrTexture; |
15 | 15 |
16 /** | 16 /** |
17 * This is a helper to implement a texture matrix in a GrGLEffect. | 17 * This is a helper to implement a matrix in a GrGLEffect that operates on incom
ing coords in the |
| 18 * vertex shader and writes them to an attribute to be used in the fragment shad
er. When the input |
| 19 * coords in the vertex shader are local coordinates this class accounts for the
coord change matrix |
| 20 * communicated via GrDrawEffect. The input coords may also be positions and in
this case the coord |
| 21 * change matrix is ignored. The GrGLEffectMatrix will emit different code based
on the type of |
| 22 * matrix and thus must contribute to the effect's key. |
| 23 * |
| 24 * This class cannot be used to apply a matrix to coordinates that come in the f
orm of custom vertex |
| 25 * attributes. |
18 */ | 26 */ |
19 class GrGLEffectMatrix { | 27 class GrGLEffectMatrix { |
| 28 private: |
| 29 // We specialize the generated code for each of these matrix types. |
| 30 enum MatrixTypes { |
| 31 kIdentity_MatrixType = 0, |
| 32 kTrans_MatrixType = 1, |
| 33 kNoPersp_MatrixType = 2, |
| 34 kGeneral_MatrixType = 3, |
| 35 }; |
| 36 // The key for is made up of a matrix type and a bit that indicates the sour
ce of the input |
| 37 // coords. |
| 38 enum { |
| 39 kMatrixTypeKeyBits = 2, |
| 40 kMatrixTypeKeyMask = (1 << kMatrixTypeKeyBits) - 1, |
| 41 kPositionCoords_Flag = (1 << kMatrixTypeKeyBits), |
| 42 kKeyBitsPrivate = kMatrixTypeKeyBits + 1, |
| 43 }; |
| 44 |
20 public: | 45 public: |
| 46 |
| 47 typedef GrEffect::CoordsType CoordsType; |
| 48 |
21 typedef GrGLEffect::EffectKey EffectKey; | 49 typedef GrGLEffect::EffectKey EffectKey; |
| 50 |
22 /** | 51 /** |
23 * The matrix uses kKeyBits of the effect's EffectKey. A GrGLEffect may plac
e these bits at an | 52 * The matrix uses kKeyBits of the effect's EffectKey. A GrGLEffect may plac
e these bits at an |
24 * arbitrary shift in its final key. However, when GrGLEffectMatrix::emitCod
e*() code is called | 53 * arbitrary shift in its final key. However, when GrGLEffectMatrix::emitCod
e*() code is called |
25 * the relevant bits must be in the lower kKeyBits of the key parameter. | 54 * the relevant bits must be in the lower kKeyBits of the key parameter. |
26 */ | 55 */ |
27 enum { | 56 enum { |
28 kKeyBits = 2, | 57 kKeyBits = kKeyBitsPrivate, |
29 kKeyMask = (1 << kKeyBits) - 1, | 58 kKeyMask = (1 << kKeyBits) - 1, |
30 }; | 59 }; |
31 | 60 |
32 GrGLEffectMatrix() : fUni(GrGLUniformManager::kInvalidUniformHandle) { | 61 GrGLEffectMatrix(CoordsType coordsType) |
| 62 : fUni(GrGLUniformManager::kInvalidUniformHandle) |
| 63 , fCoordsType(coordsType) { |
| 64 GrAssert(GrEffect::kLocal_CoordsType == coordsType || |
| 65 GrEffect::kPosition_CoordsType == coordsType); |
33 fPrevMatrix = SkMatrix::InvalidMatrix(); | 66 fPrevMatrix = SkMatrix::InvalidMatrix(); |
34 } | 67 } |
35 | 68 |
36 /** | 69 /** |
37 * Generates the key for the portion of the code emitted by this class's emi
tCode() function. | 70 * Generates the key for the portion of the code emitted by this class's emi
tCode() function. |
38 * Pass a texture to make GrGLEffectMatrix automatically adjust for the text
ure's origin. Pass | 71 * Pass a texture to make GrGLEffectMatrix automatically adjust for the text
ure's origin. Pass |
39 * NULL when not using the EffectMatrix for a texture lookups, or if the GrG
LEffect subclass | 72 * NULL when not using the EffectMatrix for a texture lookup, or if the GrGL
Effect subclass |
40 * wants to handle origin adjustments in some other manner. coordChangeMatri
x is the matrix | 73 * wants to handle origin adjustments in some other manner. The coords type
param must match the |
41 * from GrEffectStage. | 74 * param that would be used to initialize GrGLEffectMatrix for the generatin
g GrEffect. |
42 */ | 75 */ |
43 static EffectKey GenKey(const SkMatrix& effectMatrix, | 76 static EffectKey GenKey(const SkMatrix& effectMatrix, |
44 const SkMatrix& coordChangeMatrix, | 77 const GrDrawEffect&, |
| 78 CoordsType, |
45 const GrTexture*); | 79 const GrTexture*); |
46 | 80 |
47 /** | 81 /** |
48 * Emits code to implement the matrix in the VS. A varying is added as an ou
tput of the VS and | 82 * Emits code to implement the matrix in the VS. A varying is added as an ou
tput of the VS and |
49 * input to the FS. The varying may be either a vec2f or vec3f depending upo
n whether | 83 * input to the FS. The varying may be either a vec2f or vec3f depending upo
n whether |
50 * perspective interpolation is required or not. The names of the varying in
the VS and FS are | 84 * perspective interpolation is required or not. The names of the varying in
the VS and FS are |
51 * are returned as output parameters and the type of the varying is the retu
rn value. The suffix | 85 * are returned as output parameters and the type of the varying is the retu
rn value. The suffix |
52 * is an optional parameter that can be used to make all variables emitted b
y the object | 86 * is an optional parameter that can be used to make all variables emitted b
y the object |
53 * unique within a stage. It is only necessary if multiple GrGLEffectMatrix
objects are used by | 87 * unique within a stage. It is only necessary if multiple GrGLEffectMatrix
objects are used by |
54 * a GrGLEffect. | 88 * a GrGLEffect. |
55 */ | 89 */ |
56 GrSLType emitCode(GrGLShaderBuilder*, | 90 GrSLType emitCode(GrGLShaderBuilder*, |
57 EffectKey, | 91 EffectKey, |
58 const char* vertexCoords, | |
59 const char** fsCoordName, /* optional */ | 92 const char** fsCoordName, /* optional */ |
60 const char** vsCoordName = NULL, | 93 const char** vsCoordName = NULL, |
61 const char* suffix = NULL); | 94 const char* suffix = NULL); |
62 | 95 |
63 /** | 96 /** |
64 * This is similar to emitCode except that it performs perspective division
in the FS if the | 97 * This is similar to emitCode except that it performs perspective division
in the FS if the |
65 * texture coordinates have a w coordinate. The fsCoordName always refers to
a vec2f. | 98 * texture coordinates have a w coordinate. The fsCoordName always refers to
a vec2f. |
66 */ | 99 */ |
67 void emitCodeMakeFSCoords2D(GrGLShaderBuilder*, | 100 void emitCodeMakeFSCoords2D(GrGLShaderBuilder*, |
68 EffectKey, | 101 EffectKey, |
69 const char* vertexCoords, | |
70 const char** fsCoordName, /* optional */ | 102 const char** fsCoordName, /* optional */ |
71 const char** vsVaryingName = NULL, | 103 const char** vsVaryingName = NULL, |
72 GrSLType* vsVaryingType = NULL, | 104 GrSLType* vsVaryingType = NULL, |
73 const char* suffix = NULL); | 105 const char* suffix = NULL); |
74 /** | 106 /** |
75 * Call from a GrGLEffect's subclass to update the texture matrix. The matri
x, | 107 * Call from a GrGLEffect's subclass to update the texture matrix. The effec
tMatrix and texture |
76 * coordChangeMatrix, and texture params should match those used with GenKey
. | 108 * params should match those used with GenKey. |
77 */ | 109 */ |
78 void setData(const GrGLUniformManager& uniformManager, | 110 void setData(const GrGLUniformManager& uniformManager, |
79 const SkMatrix& effectMatrix, | 111 const SkMatrix& effectMatrix, |
80 const SkMatrix& coordChangeMatrix, | 112 const GrDrawEffect& drawEffect, |
81 const GrTexture*); | 113 const GrTexture*); |
82 | 114 |
83 private: | |
84 enum { | |
85 kIdentity_Key = 0, | |
86 kTrans_Key = 1, | |
87 kNoPersp_Key = 2, | |
88 kGeneral_Key = 3, | |
89 }; | |
90 | |
91 GrGLUniformManager::UniformHandle fUni; | 115 GrGLUniformManager::UniformHandle fUni; |
92 GrSLType fUniType; | 116 GrSLType fUniType; |
93 SkMatrix fPrevMatrix; | 117 SkMatrix fPrevMatrix; |
| 118 CoordsType fCoordsType; |
94 }; | 119 }; |
95 | 120 |
96 #endif | 121 #endif |
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