| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkNormalSourcePriv_DEFINED |
| #define SkNormalSourcePriv_DEFINED |
| |
| #if SK_SUPPORT_GPU |
| #include "glsl/GrGLSLFragmentProcessor.h" |
| #include "glsl/GrGLSLFragmentShaderBuilder.h" |
| |
| /* GLSLFragmentProcessors for NormalSourceImpls must sub-class this class and override onEmitCode, |
| * and setNormalData calls, as well as all other calls FPs normally override, except for the 2 |
| * defined in this superclass. |
| * This class exists to intercept emitCode calls and emit <0, 0, 1> if the FP requires a distance |
| * vector but the GP doesn't provide it. onSetData calls need to be intercepted too because |
| * uniform handlers will be invalid in subclasses where onEmitCode isn't called. |
| * We don't need to adjust the key here since the use of a given GP (through its class ID already in |
| * the key), will determine what code gets emitted here. |
| */ |
| class GLSLNormalFP : public GrGLSLFragmentProcessor { |
| public: |
| GLSLNormalFP() |
| : fDidIntercept(false) {} |
| |
| void emitCode(EmitArgs& args) final override { |
| if (args.fFp.usesDistanceVectorField() && !args.fGpImplementsDistanceVector) { |
| GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; |
| fragBuilder->codeAppendf("// GLSLNormalFP intercepted emitCode call, GP does not " |
| "implement required distance vector feature\n"); |
| fragBuilder->codeAppendf("%s = vec4(0, 0, 1, 0);", args.fOutputColor); |
| |
| fDidIntercept = true; |
| } else { |
| this->onEmitCode(args); |
| } |
| } |
| |
| void onSetData(const GrGLSLProgramDataManager& pdman, const GrProcessor& proc) final override { |
| if (!fDidIntercept) { |
| this->setNormalData(pdman, proc); |
| } |
| } |
| |
| protected: |
| virtual void onEmitCode(EmitArgs& args) = 0; |
| virtual void setNormalData(const GrGLSLProgramDataManager& pdman, const GrProcessor& proc) = 0; |
| |
| private: |
| bool fDidIntercept; |
| }; |
| #endif |
| |
| #endif |