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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 GrGLFragmentBuilder* fsBuilder = args.fBuilder->getFragmentShaderBuilder
(); |
| 18 fsBuilder->codeAppendf("vec4 alpha4 = %s.aaaa;", args.fInputColor); |
| 19 SkString output; |
| 20 this->emitChild(0, "alpha4", &output, args); |
| 21 fsBuilder->codeAppendf("%s = %s;", args.fOutputColor, output.c_str()); |
| 22 } |
| 23 |
| 24 private: |
| 25 typedef GrGLFragmentProcessor INHERITED; |
| 26 }; |
| 27 |
| 28 GrGLFragmentProcessor* GrExtractAlphaFragmentProcessor::onCreateGLInstance() con
st { |
| 29 return SkNEW(GLExtractAlphaFragmentProcessor); |
| 30 } |
| 31 |
| 32 void GrExtractAlphaFragmentProcessor::onGetGLProcessorKey(const GrGLSLCaps&, |
| 33 GrProcessorKeyBuilder*
) const { |
| 34 } |
| 35 |
| 36 bool GrExtractAlphaFragmentProcessor::onIsEqual(const GrFragmentProcessor&) cons
t { return true; } |
| 37 |
| 38 void GrExtractAlphaFragmentProcessor::onComputeInvariantOutput(GrInvariantOutput
* inout) const { |
| 39 if (inout->validFlags() & kA_GrColorComponentFlag) { |
| 40 GrColor color = GrColorPackA4(GrColorUnpackA(inout->color())); |
| 41 inout->setToOther(kRGBA_GrColorComponentFlags, color, |
| 42 GrInvariantOutput::kWill_ReadInput); |
| 43 } else { |
| 44 inout->setToUnknown(GrInvariantOutput::kWill_ReadInput); |
| 45 } |
| 46 this->childProcessor(0).computeInvariantOutput(inout); |
| 47 } |
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