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1 /* | |
2 * Copyright 2015 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 #include "effects/GrExtractAlphaFragmentProcessor.h" | |
9 #include "gl/GrGLFragmentProcessor.h" | |
10 #include "gl/builders/GrGLProgramBuilder.h" | |
11 | |
12 class GLExtractAlphaFragmentProcessor : public GrGLFragmentProcessor { | |
13 public: | |
14 GLExtractAlphaFragmentProcessor() {} | |
15 | |
16 void emitCode(EmitArgs& args) override { | |
17 if (args.fInputColor) { | |
18 GrGLFragmentBuilder* fsBuilder = args.fBuilder->getFragmentShaderBui
lder(); | |
19 fsBuilder->codeAppendf("vec4 alpha4 = %s.aaaa;", args.fInputColor); | |
20 this->emitChild(0, "alpha4", args.fOutputColor, args); | |
21 } else { | |
22 this->emitChild(0, nullptr, args.fOutputColor, args); | |
23 } | |
24 } | |
25 | |
26 private: | |
27 typedef GrGLFragmentProcessor INHERITED; | |
28 }; | |
29 | |
30 GrGLFragmentProcessor* GrExtractAlphaFragmentProcessor::onCreateGLInstance() con
st { | |
31 return SkNEW(GLExtractAlphaFragmentProcessor); | |
32 } | |
33 | |
34 void GrExtractAlphaFragmentProcessor::onGetGLProcessorKey(const GrGLSLCaps&, | |
35 GrProcessorKeyBuilder*
) const { | |
36 } | |
37 | |
38 bool GrExtractAlphaFragmentProcessor::onIsEqual(const GrFragmentProcessor&) cons
t { return true; } | |
39 | |
40 void GrExtractAlphaFragmentProcessor::onComputeInvariantOutput(GrInvariantOutput
* inout) const { | |
41 if (inout->validFlags() & kA_GrColorComponentFlag) { | |
42 GrColor color = GrColorPackA4(GrColorUnpackA(inout->color())); | |
43 inout->setToOther(kRGBA_GrColorComponentFlags, color, | |
44 GrInvariantOutput::kWill_ReadInput); | |
45 } else { | |
46 inout->setToUnknown(GrInvariantOutput::kWill_ReadInput); | |
47 } | |
48 this->childProcessor(0).computeInvariantOutput(inout); | |
49 } | |
50 | |
51 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrExtractAlphaFragmentProcessor); | |
52 | |
53 const GrFragmentProcessor* GrExtractAlphaFragmentProcessor::TestCreate(GrProcess
orTestData* d) { | |
54 SkAutoTUnref<const GrFragmentProcessor> child(GrProcessorUnitTest::CreateChi
ldFP(d)); | |
55 return SkNEW_ARGS(GrExtractAlphaFragmentProcessor, (child)); | |
56 } | |
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