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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "effects/GrExtractAlphaFragmentProcessor.h"
#include "gl/GrGLFragmentProcessor.h"
#include "gl/builders/GrGLProgramBuilder.h"
class GLExtractAlphaFragmentProcessor : public GrGLFragmentProcessor {
public:
GLExtractAlphaFragmentProcessor() {}
void emitCode(EmitArgs& args) override {
GrGLFragmentBuilder* fsBuilder = args.fBuilder->getFragmentShaderBuilder();
fsBuilder->codeAppendf("vec4 alpha4 = %s.aaaa;", args.fInputColor);
this->emitChild(0, "alpha4", args.fOutputColor, args);
}
private:
typedef GrGLFragmentProcessor INHERITED;
};
GrGLFragmentProcessor* GrExtractAlphaFragmentProcessor::onCreateGLInstance() const {
return SkNEW(GLExtractAlphaFragmentProcessor);
}
void GrExtractAlphaFragmentProcessor::onGetGLProcessorKey(const GrGLSLCaps&,
GrProcessorKeyBuilder*) const {
}
bool GrExtractAlphaFragmentProcessor::onIsEqual(const GrFragmentProcessor&) const { return true; }
void GrExtractAlphaFragmentProcessor::onComputeInvariantOutput(GrInvariantOutput* inout) const {
if (inout->validFlags() & kA_GrColorComponentFlag) {
GrColor color = GrColorPackA4(GrColorUnpackA(inout->color()));
inout->setToOther(kRGBA_GrColorComponentFlags, color,
GrInvariantOutput::kWill_ReadInput);
} else {
inout->setToUnknown(GrInvariantOutput::kWill_ReadInput);
}
this->childProcessor(0).computeInvariantOutput(inout);
}
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