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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 | |
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