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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 #include "glsl/GrGLSLProcessorTypes.h" |
| 14 |
| 13 class GrGLVarying; | 15 class GrGLVarying; |
| 14 | 16 |
| 15 /* | 17 /* |
| 16 * This base class encapsulates the functionality which the GP uses to build fra
gment shaders | 18 * This base class encapsulates the functionality which the GP uses to build fra
gment shaders |
| 17 */ | 19 */ |
| 18 class GrGLFragmentBuilder : public GrGLShaderBuilder { | 20 class GrGLFragmentBuilder : public GrGLShaderBuilder { |
| 19 public: | 21 public: |
| 20 GrGLFragmentBuilder(GrGLProgramBuilder* program) | 22 GrGLFragmentBuilder(GrGLProgramBuilder* program) |
| 21 : INHERITED(program) { | 23 : INHERITED(program) { |
| 22 fSubstageIndices.push_back(0); | 24 fSubstageIndices.push_back(0); |
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| 35 * If the feature is supported then true is returned and any necessary #exte
nsion declarations | 37 * If the feature is supported then true is returned and any necessary #exte
nsion declarations |
| 36 * are added to the shaders. If the feature is not supported then false will
be returned. | 38 * are added to the shaders. If the feature is not supported then false will
be returned. |
| 37 */ | 39 */ |
| 38 virtual bool enableFeature(GLSLFeature) = 0; | 40 virtual bool enableFeature(GLSLFeature) = 0; |
| 39 | 41 |
| 40 /** | 42 /** |
| 41 * This returns a variable name to access the 2D, perspective correct versio
n of the coords in | 43 * This returns a variable name to access the 2D, perspective correct versio
n of the coords in |
| 42 * the fragment shader. If the coordinates at index are 3-dimensional, it im
mediately emits a | 44 * the fragment shader. If the coordinates at index are 3-dimensional, it im
mediately emits a |
| 43 * perspective divide into the fragment shader (xy / z) to convert them to 2
D. | 45 * perspective divide into the fragment shader (xy / z) to convert them to 2
D. |
| 44 */ | 46 */ |
| 45 virtual SkString ensureFSCoords2D(const GrGLProcessor::TransformedCoordsArra
y& coords, | 47 virtual SkString ensureFSCoords2D(const GrGLSLTransformedCoordsArray& coords
, int index) = 0; |
| 46 int index) = 0; | |
| 47 | 48 |
| 48 | 49 |
| 49 /** Returns a variable name that represents the position of the fragment in
the FS. The position | 50 /** Returns a variable name that represents the position of the fragment in
the FS. The position |
| 50 is in device space (e.g. 0,0 is the top left and pixel centers are at ha
lf-integers). */ | 51 is in device space (e.g. 0,0 is the top left and pixel centers are at ha
lf-integers). */ |
| 51 virtual const char* fragmentPosition() = 0; | 52 virtual const char* fragmentPosition() = 0; |
| 52 | 53 |
| 53 /** | 54 /** |
| 54 * Fragment procs with child procs should call these functions before/after
calling emitCode | 55 * Fragment procs with child procs should call these functions before/after
calling emitCode |
| 55 * on a child proc. | 56 * on a child proc. |
| 56 */ | 57 */ |
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| 120 | 121 |
| 121 /** Returns a key for reading the fragment location. This should only be cal
led if there is an | 122 /** Returns a key for reading the fragment location. This should only be cal
led if there is an |
| 122 effect that will requires the fragment position. If the fragment position
is not required, | 123 effect that will requires the fragment position. If the fragment position
is not required, |
| 123 the key is 0. */ | 124 the key is 0. */ |
| 124 static FragPosKey KeyForFragmentPosition(const GrRenderTarget* dst, const Gr
GLCaps&); | 125 static FragPosKey KeyForFragmentPosition(const GrRenderTarget* dst, const Gr
GLCaps&); |
| 125 | 126 |
| 126 GrGLFragmentShaderBuilder(GrGLProgramBuilder* program, uint8_t fragPosKey); | 127 GrGLFragmentShaderBuilder(GrGLProgramBuilder* program, uint8_t fragPosKey); |
| 127 | 128 |
| 128 // true public interface, defined explicitly in the abstract interfaces abov
e | 129 // true public interface, defined explicitly in the abstract interfaces abov
e |
| 129 bool enableFeature(GLSLFeature) override; | 130 bool enableFeature(GLSLFeature) override; |
| 130 virtual SkString ensureFSCoords2D(const GrGLProcessor::TransformedCoordsArra
y& coords, | 131 virtual SkString ensureFSCoords2D(const GrGLSLTransformedCoordsArray& coords
, |
| 131 int index) override; | 132 int index) override; |
| 132 const char* fragmentPosition() override; | 133 const char* fragmentPosition() override; |
| 133 const char* dstColor() override; | 134 const char* dstColor() override; |
| 134 | 135 |
| 135 void enableAdvancedBlendEquationIfNeeded(GrBlendEquation) override; | 136 void enableAdvancedBlendEquationIfNeeded(GrBlendEquation) override; |
| 136 | 137 |
| 137 private: | 138 private: |
| 138 // Private public interface, used by GrGLProgramBuilder to build a fragment
shader | 139 // Private public interface, used by GrGLProgramBuilder to build a fragment
shader |
| 139 void enableCustomOutput(); | 140 void enableCustomOutput(); |
| 140 void enableSecondaryOutput(); | 141 void enableSecondaryOutput(); |
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| 194 // the program creator | 195 // the program creator |
| 195 bool fHasReadDstColor; | 196 bool fHasReadDstColor; |
| 196 bool fHasReadFragmentPosition; | 197 bool fHasReadFragmentPosition; |
| 197 | 198 |
| 198 friend class GrGLProgramBuilder; | 199 friend class GrGLProgramBuilder; |
| 199 | 200 |
| 200 typedef GrGLXPFragmentBuilder INHERITED; | 201 typedef GrGLXPFragmentBuilder INHERITED; |
| 201 }; | 202 }; |
| 202 | 203 |
| 203 #endif | 204 #endif |
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