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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 GrGLFragmentShaderBuilder_DEFINED | 8 #ifndef GrGLFragmentShaderBuilder_DEFINED |
9 #define GrGLFragmentShaderBuilder_DEFINED | 9 #define GrGLFragmentShaderBuilder_DEFINED |
10 | 10 |
11 #include "GrGLShaderBuilder.h" | 11 #include "GrGLShaderBuilder.h" |
12 | 12 |
13 class GrGLVarying; | |
14 | |
15 /* | 13 /* |
16 * This base class encapsulates the functionality which the GP uses to build fra
gment shaders | 14 * This base class encapsulates the functionality which the GP uses to build fra
gment shaders |
17 */ | 15 */ |
18 class GrGLGPFragmentBuilder : public GrGLShaderBuilder { | 16 class GrGLGPFragmentBuilder : public GrGLShaderBuilder { |
19 public: | 17 public: |
20 GrGLGPFragmentBuilder(GrGLProgramBuilder* program) : INHERITED(program) {} | 18 GrGLGPFragmentBuilder(GrGLProgramBuilder* program) : INHERITED(program) {} |
21 virtual ~GrGLGPFragmentBuilder() {} | 19 virtual ~GrGLGPFragmentBuilder() {} |
22 /** | 20 /** |
23 * Use of these features may require a GLSL extension to be enabled. Shaders
may not compile | 21 * Use of these features may require a GLSL extension to be enabled. Shaders
may not compile |
24 * if code is added that uses one of these features without calling enableFe
ature() | 22 * if code is added that uses one of these features without calling enableFe
ature() |
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86 | 84 |
87 GrGLFragmentShaderBuilder(GrGLProgramBuilder* program, const GrGLProgramDesc
& desc); | 85 GrGLFragmentShaderBuilder(GrGLProgramBuilder* program, const GrGLProgramDesc
& desc); |
88 | 86 |
89 // true public interface, defined explicitly in the abstract interfaces abov
e | 87 // true public interface, defined explicitly in the abstract interfaces abov
e |
90 virtual bool enableFeature(GLSLFeature) SK_OVERRIDE; | 88 virtual bool enableFeature(GLSLFeature) SK_OVERRIDE; |
91 virtual SkString ensureFSCoords2D(const GrGLProcessor::TransformedCoordsArra
y& coords, | 89 virtual SkString ensureFSCoords2D(const GrGLProcessor::TransformedCoordsArra
y& coords, |
92 int index) SK_OVERRIDE; | 90 int index) SK_OVERRIDE; |
93 virtual const char* fragmentPosition() SK_OVERRIDE; | 91 virtual const char* fragmentPosition() SK_OVERRIDE; |
94 virtual const char* dstColor() SK_OVERRIDE; | 92 virtual const char* dstColor() SK_OVERRIDE; |
95 | 93 |
96 private: | |
97 // Private public interface, used by GrGLProgramBuilder to build a fragment
shader | 94 // Private public interface, used by GrGLProgramBuilder to build a fragment
shader |
98 void emitCodeToReadDstTexture(); | 95 void emitCodeToReadDstTexture(); |
99 void enableCustomOutput(); | 96 void enableCustomOutput(); |
100 void enableSecondaryOutput(); | 97 void enableSecondaryOutput(); |
101 const char* getPrimaryColorOutputName() const; | 98 const char* getPrimaryColorOutputName() const; |
102 const char* getSecondaryColorOutputName() const; | 99 const char* getSecondaryColorOutputName() const; |
103 void enableSecondaryOutput(const GrGLSLExpr4& inputColor, const GrGLSLExpr4&
inputCoverage); | 100 void enableSecondaryOutput(const GrGLSLExpr4& inputColor, const GrGLSLExpr4&
inputCoverage); |
104 void combineColorAndCoverage(const GrGLSLExpr4& inputColor, const GrGLSLExpr
4& inputCoverage); | 101 void combineColorAndCoverage(const GrGLSLExpr4& inputColor, const GrGLSLExpr
4& inputCoverage); |
105 bool compileAndAttachShaders(GrGLuint programId, SkTDArray<GrGLuint>* shader
Ids) const; | 102 bool compileAndAttachShaders(GrGLuint programId, SkTDArray<GrGLuint>* shader
Ids) const; |
106 void bindFragmentShaderLocations(GrGLuint programID); | 103 void bindFragmentShaderLocations(GrGLuint programID); |
107 | 104 |
| 105 /* |
| 106 * An internal call for GrGLProgramBuilder to use to add varyings to the ver
tex shader |
| 107 */ |
| 108 void addVarying(GrSLType type, |
| 109 const char* name, |
| 110 const char** fsInName, |
| 111 GrGLShaderVar::Precision fsPrecision = GrGLShaderVar::kDefaul
t_Precision); |
| 112 |
108 // As GLProcessors emit code, there are some conditions we need to verify.
We use the below | 113 // As GLProcessors emit code, there are some conditions we need to verify.
We use the below |
109 // state to track this. The reset call is called per processor emitted. | 114 // state to track this. The reset call is called per processor emitted. |
110 bool hasReadDstColor() const { return fHasReadDstColor; } | 115 bool hasReadDstColor() const { return fHasReadDstColor; } |
111 bool hasReadFragmentPosition() const { return fHasReadFragmentPosition; } | 116 bool hasReadFragmentPosition() const { return fHasReadFragmentPosition; } |
112 void reset() { | 117 void reset() { |
113 fHasReadDstColor = false; | 118 fHasReadDstColor = false; |
114 fHasReadFragmentPosition = false; | 119 fHasReadFragmentPosition = false; |
115 } | 120 } |
116 | 121 |
117 /* | 122 private: |
118 * An internal call for GrGLProgramBuilder to use to add varyings to the ver
tex shader | |
119 */ | |
120 void addVarying(GrGLVarying* v, | |
121 GrGLShaderVar::Precision fsPrec = GrGLShaderVar::kDefault_Pr
ecision); | |
122 | |
123 /** | 123 /** |
124 * Features that should only be enabled by GrGLFragmentShaderBuilder itself. | 124 * Features that should only be enabled by GrGLFragmentShaderBuilder itself. |
125 */ | 125 */ |
126 enum GLSLPrivateFeature { | 126 enum GLSLPrivateFeature { |
127 kFragCoordConventions_GLSLPrivateFeature = kLastGLSLFeature + 1, | 127 kFragCoordConventions_GLSLPrivateFeature = kLastGLSLFeature + 1, |
128 kLastGLSLPrivateFeature = kFragCoordConventions_GLSLPrivateFeature | 128 kLastGLSLPrivateFeature = kFragCoordConventions_GLSLPrivateFeature |
129 }; | 129 }; |
130 | 130 |
131 // Interpretation of DstReadKey when generating code | 131 // Interpretation of DstReadKey when generating code |
132 enum { | 132 enum { |
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156 bool fHasReadDstColor; | 156 bool fHasReadDstColor; |
157 bool fHasReadFragmentPosition; | 157 bool fHasReadFragmentPosition; |
158 | 158 |
159 friend class GrGLNvprProgramBuilder; | 159 friend class GrGLNvprProgramBuilder; |
160 friend class GrGLProgramBuilder; | 160 friend class GrGLProgramBuilder; |
161 | 161 |
162 typedef GrGLFPFragmentBuilder INHERITED; | 162 typedef GrGLFPFragmentBuilder INHERITED; |
163 }; | 163 }; |
164 | 164 |
165 #endif | 165 #endif |
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