OLD | NEW |
(Empty) | |
| 1 /* |
| 2 * Copyright 2016 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 SkNormalSourcePriv_DEFINED |
| 9 #define SkNormalSourcePriv_DEFINED |
| 10 |
| 11 #if SK_SUPPORT_GPU |
| 12 #include "glsl/GrGLSLFragmentProcessor.h" |
| 13 #include "glsl/GrGLSLFragmentShaderBuilder.h" |
| 14 |
| 15 /* GLSLFragmentProcessors for NormalSourceImpls must sub-class this class and ov
erride onEmitCode, |
| 16 * and setNormalData calls, as well as all other calls FPs normally override, ex
cept for the 2 |
| 17 * defined in this superclass. |
| 18 * This class exists to intercept emitCode calls and emit <0, 0, 1> if the FP re
quires a distance |
| 19 * vector but the GP doesn't provide it. onSetData calls need to be intercepted
too because |
| 20 * uniform handlers will be invalid in subclasses where onEmitCode isn't called. |
| 21 * We don't need to adjust the key here since the use of a given GP (through its
class ID already in |
| 22 * the key), will determine what code gets emitted here. |
| 23 */ |
| 24 class GLSLNormalFP : public GrGLSLFragmentProcessor { |
| 25 public: |
| 26 GLSLNormalFP() |
| 27 : fDidIntercept(false) {} |
| 28 |
| 29 void emitCode(EmitArgs& args) final override { |
| 30 if (args.fFp.usesDistanceVectorField() && !args.fGpImplementsDistanceVec
tor) { |
| 31 GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder; |
| 32 fragBuilder->codeAppendf("// GLSLNormalFP intercepted emitCode call,
GP does not " |
| 33 "implement required distance vector
feature\n"); |
| 34 fragBuilder->codeAppendf("%s = vec4(0, 0, 1, 0);", args.fOutputColor
); |
| 35 |
| 36 fDidIntercept = true; |
| 37 } else { |
| 38 this->onEmitCode(args); |
| 39 } |
| 40 } |
| 41 |
| 42 void onSetData(const GrGLSLProgramDataManager& pdman, const GrProcessor& pro
c) final override { |
| 43 if (!fDidIntercept) { |
| 44 this->setNormalData(pdman, proc); |
| 45 } |
| 46 } |
| 47 |
| 48 protected: |
| 49 virtual void onEmitCode(EmitArgs& args) = 0; |
| 50 virtual void setNormalData(const GrGLSLProgramDataManager& pdman, const GrPr
ocessor& proc) = 0; |
| 51 |
| 52 private: |
| 53 bool fDidIntercept; |
| 54 }; |
| 55 #endif |
| 56 |
| 57 #endif |
OLD | NEW |