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1 /* | 1 /* |
2 * Copyright 2014 Google Inc. | 2 * Copyright 2014 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 GrGLVertexShader_DEFINED | 8 #ifndef GrGLVertexShader_DEFINED |
9 #define GrGLVertexShader_DEFINED | 9 #define GrGLVertexShader_DEFINED |
10 | |
11 #include "GrGLShaderBuilder.h" | 10 #include "GrGLShaderBuilder.h" |
12 | 11 |
13 class GrGLProgramBuilder; | 12 class GrGLProgramBuilder; |
14 | 13 |
15 // TODO we only actually ever need to return a GrGLShaderBuilder for this guy, n
one of the below | 14 class GrGLVertexShaderBuilder : public GrGLFullShaderBuilder { |
16 // functions need to be part of VertexShaderBuilder's public interface | |
17 class GrGLVertexBuilder : public GrGLShaderBuilder { | |
18 public: | 15 public: |
19 GrGLVertexBuilder(GrGLProgramBuilder* program); | 16 GrGLVertexShaderBuilder(GrGLFullProgramBuilder* program); |
| 17 |
| 18 /* |
| 19 * this call is only for GrGLProgramEffects' internal use |
| 20 */ |
| 21 void emitAttributes(const GrGeometryProcessor& gp); |
20 | 22 |
21 /** | 23 /** |
22 * Are explicit local coordinates provided as input to the vertex shader. | 24 * Are explicit local coordinates provided as input to the vertex shader. |
23 */ | 25 */ |
24 bool hasExplicitLocalCoords() const { return (fLocalCoordsVar != fPositionVa
r); } | 26 bool hasExplicitLocalCoords() const { return (fLocalCoordsVar != fPositionVa
r); } |
25 | 27 |
| 28 const SkString* getEffectAttributeName(int attributeIndex) const; |
| 29 |
26 /** Returns a vertex attribute that represents the local coords in the VS. T
his may be the same | 30 /** Returns a vertex attribute that represents the local coords in the VS. T
his may be the same |
27 as positionAttribute() or it may not be. It depends upon whether the ren
dering code | 31 as positionAttribute() or it may not be. It depends upon whether the ren
dering code |
28 specified explicit local coords or not in the GrDrawState. */ | 32 specified explicit local coords or not in the GrDrawState. */ |
29 const GrGLShaderVar& localCoordsAttribute() const { return *fLocalCoordsVar;
} | 33 const GrGLShaderVar& localCoordsAttribute() const { return *fLocalCoordsVar;
} |
30 | 34 |
31 /** Returns a vertex attribute that represents the vertex position in the VS
. This is the | 35 /** Returns a vertex attribute that represents the vertex position in the VS
. This is the |
32 pre-matrix position and is commonly used by effects to compute texture c
oords via a matrix. | 36 pre-matrix position and is commonly used by effects to compute texture c
oords via a matrix. |
33 */ | 37 */ |
34 const GrGLShaderVar& positionAttribute() const { return *fPositionVar; } | 38 const GrGLShaderVar& positionAttribute() const { return *fPositionVar; } |
35 | 39 |
| 40 private: |
36 /* | 41 /* |
37 * Internal call for GrGLProgramBuilder.addVarying | 42 * Add attribute will push a new attribute onto the end. It will also asser
t if there is |
| 43 * a duplicate attribute |
38 */ | 44 */ |
39 SkString* addVarying(GrSLType type, const char* name, const char** vsOutName
); | 45 bool addAttribute(const GrShaderVar& var); |
| 46 |
| 47 /* |
| 48 * Internal call for GrGLFullProgramBuilder.addVarying |
| 49 */ |
| 50 void addVarying(GrSLType type, |
| 51 const char* name, |
| 52 const char** vsOutName); |
40 | 53 |
41 /* | 54 /* |
42 * private helpers for compilation by GrGLProgramBuilder | 55 * private helpers for compilation by GrGLProgramBuilder |
43 */ | 56 */ |
44 void setupLocalCoords(); | 57 void bindProgramLocations(GrGLuint programId); |
45 void transformGLToSkiaCoords(); | |
46 void setupBuiltinVertexAttribute(const char* inName, GrGLSLExpr4* out); | |
47 void emitAttributes(const GrGeometryProcessor& gp); | |
48 void transformSkiaToGLCoords(); | |
49 void bindVertexAttributes(GrGLuint programID); | |
50 bool compileAndAttachShaders(GrGLuint programId, SkTDArray<GrGLuint>* shader
Ids) const; | 58 bool compileAndAttachShaders(GrGLuint programId, SkTDArray<GrGLuint>* shader
Ids) const; |
| 59 void emitCodeBeforeEffects(GrGLSLExpr4* color, GrGLSLExpr4* coverage); |
| 60 void emitCodeAfterEffects(); |
51 | 61 |
52 private: | |
53 // an internal call which checks for uniquness of a var before adding it to
the list of inputs | |
54 bool addAttribute(const GrShaderVar& var); | |
55 struct AttributePair { | 62 struct AttributePair { |
56 void set(int index, const SkString& name) { | 63 void set(int index, const SkString& name) { |
57 fIndex = index; fName = name; | 64 fIndex = index; fName = name; |
58 } | 65 } |
59 int fIndex; | 66 int fIndex; |
60 SkString fName; | 67 SkString fName; |
61 }; | 68 }; |
62 | 69 |
63 GrGLShaderVar* fPositionVar; | 70 GrGLShaderVar* fPositionVar; |
64 GrGLShaderVar* fLocalCoordsVar; | 71 GrGLShaderVar* fLocalCoordsVar; |
65 int fEffectAttribOffset; | 72 int fEffectAttribOffset; |
66 | 73 |
67 typedef GrGLShaderBuilder INHERITED; | 74 friend class GrGLFullProgramBuilder; |
| 75 |
| 76 typedef GrGLFullShaderBuilder INHERITED; |
68 }; | 77 }; |
69 | 78 |
70 #endif | 79 #endif |
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