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| 1 /* | |
| 2 * Copyright 2014 Google Inc. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license that can be | |
| 5 * found in the LICENSE file. | |
| 6 */ | |
| 7 | |
| 8 #ifndef GrGLXferProcessor_DEFINED | |
| 9 #define GrGLXferProcessor_DEFINED | |
| 10 | |
| 11 #include "glsl/GrGLSLProgramDataManager.h" | |
| 12 #include "glsl/GrGLSLTextureSampler.h" | |
| 13 | |
| 14 class GrGLSLXPBuilder; | |
| 15 class GrXferProcessor; | |
| 16 | |
| 17 class GrGLXferProcessor { | |
| 18 public: | |
| 19 GrGLXferProcessor() {} | |
| 20 virtual ~GrGLXferProcessor() {} | |
| 21 | |
| 22 typedef GrGLSLTextureSampler::TextureSamplerArray TextureSamplerArray; | |
| 23 struct EmitArgs { | |
| 24 EmitArgs(GrGLSLXPBuilder* pb, | |
| 25 const GrXferProcessor& xp, | |
| 26 const char* inputColor, | |
| 27 const char* inputCoverage, | |
| 28 const char* outputPrimary, | |
| 29 const char* outputSecondary, | |
| 30 const TextureSamplerArray& samplers) | |
| 31 : fPB(pb) | |
| 32 , fXP(xp) | |
| 33 , fInputColor(inputColor) | |
| 34 , fInputCoverage(inputCoverage) | |
| 35 , fOutputPrimary(outputPrimary) | |
| 36 , fOutputSecondary(outputSecondary) | |
| 37 , fSamplers(samplers) {} | |
| 38 | |
| 39 GrGLSLXPBuilder* fPB; | |
| 40 const GrXferProcessor& fXP; | |
| 41 const char* fInputColor; | |
| 42 const char* fInputCoverage; | |
| 43 const char* fOutputPrimary; | |
| 44 const char* fOutputSecondary; | |
| 45 const TextureSamplerArray& fSamplers; | |
| 46 }; | |
| 47 /** | |
| 48 * This is similar to emitCode() in the base class, except it takes a full s
hader builder. | |
| 49 * This allows the effect subclass to emit vertex code. | |
| 50 */ | |
| 51 void emitCode(const EmitArgs&); | |
| 52 | |
| 53 /** A GrGLXferProcessor instance can be reused with any GrGLXferProcessor th
at produces | |
| 54 the same stage key; this function reads data from a GrGLXferProcessor an
d uploads any | |
| 55 uniform variables required by the shaders created in emitCode(). The Gr
XferProcessor | |
| 56 parameter is guaranteed to be of the same type that created this GrGLXfe
rProcessor and | |
| 57 to have an identical processor key as the one that created this GrGLXfer
Processor. This | |
| 58 function calls onSetData on the subclass of GrGLXferProcessor | |
| 59 */ | |
| 60 void setData(const GrGLSLProgramDataManager& pdm, const GrXferProcessor& xp)
; | |
| 61 | |
| 62 private: | |
| 63 /** | |
| 64 * Called by emitCode() when the XP will not be performing a dst read. This
method is | |
| 65 * responsible for both blending and coverage. A subclass only needs to impl
ement this method if | |
| 66 * it can construct a GrXferProcessor that will not read the dst color. | |
| 67 */ | |
| 68 virtual void emitOutputsForBlendState(const EmitArgs&) { | |
| 69 SkFAIL("emitOutputsForBlendState not implemented."); | |
| 70 } | |
| 71 | |
| 72 /** | |
| 73 * Called by emitCode() when the XP will perform a dst read. This method onl
y needs to supply | |
| 74 * the blending logic. The base class applies coverage. A subclass only need
s to implement this | |
| 75 * method if it can construct a GrXferProcessor that reads the dst color. | |
| 76 */ | |
| 77 virtual void emitBlendCodeForDstRead(GrGLSLXPBuilder*, | |
| 78 const char* srcColor, | |
| 79 const char* dstColor, | |
| 80 const char* outColor, | |
| 81 const GrXferProcessor&) { | |
| 82 SkFAIL("emitBlendCodeForDstRead not implemented."); | |
| 83 } | |
| 84 | |
| 85 virtual void onSetData(const GrGLSLProgramDataManager&, const GrXferProcesso
r&) = 0; | |
| 86 | |
| 87 GrGLSLProgramDataManager::UniformHandle fDstTopLeftUni; | |
| 88 GrGLSLProgramDataManager::UniformHandle fDstScaleUni; | |
| 89 }; | |
| 90 #endif | |
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Chromium Code Reviews
Issue 1440073002:
Move XferProcessors to glsl (Closed)
Base URL: https://skia.googlesource.com/skia.git@fragProcs