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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "effects/GrBlurredEdgeFragmentProcessor.h"
#include "GrInvariantOutput.h"
#include "glsl/GrGLSLFragmentProcessor.h"
#include "glsl/GrGLSLFragmentShaderBuilder.h"
class GLSLBlurredEdgeFP : public GrGLSLFragmentProcessor {
public:
GLSLBlurredEdgeFP() {}
void emitCode(EmitArgs& args) override {
GrBlurredEdgeFP::Mode mode = args.fFp.cast<GrBlurredEdgeFP>().mode();
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
fragBuilder->codeAppendf("vec4 color = %s;", args.fInputColor);
if (!args.fGpImplementsDistanceVector) {
fragBuilder->codeAppendf("// assuming interpolant is set in vertex colors\n");
fragBuilder->codeAppendf("float factor = 1.0 - color.b;");
} else {
fragBuilder->codeAppendf("// using distance to edge to compute interpolant\n");
fragBuilder->codeAppend("float radius = color.r*256.0*64.0 + color.g*64.0;");
fragBuilder->codeAppend("float pad = color.b*64.0;");
fragBuilder->codeAppendf("float factor = 1.0 - clamp((%s.z - pad)/radius, 0.0, 1.0);",
fragBuilder->distanceVectorName());
}
switch (mode) {
case GrBlurredEdgeFP::kGaussian_Mode:
fragBuilder->codeAppend("factor = exp(-factor * factor * 4.0) - 0.018;");
break;
case GrBlurredEdgeFP::kSmoothstep_Mode:
fragBuilder->codeAppend("factor = smoothstep(factor, 0.0, 1.0);");
break;
}
fragBuilder->codeAppendf("%s = factor*vec4(0.0, 0.0, 0.0, color.a);",
args.fOutputColor);
}
protected:
void onSetData(const GrGLSLProgramDataManager& pdman, const GrProcessor& proc) override {}
GrBlurredEdgeFP::Mode fMode;
};
GrGLSLFragmentProcessor* GrBlurredEdgeFP::onCreateGLSLInstance() const {
return new GLSLBlurredEdgeFP();
}
void GrBlurredEdgeFP::onGetGLSLProcessorKey(const GrShaderCaps& caps,
GrProcessorKeyBuilder* b) const {
b->add32(fMode);
}
bool GrBlurredEdgeFP::onIsEqual(const GrFragmentProcessor& other) const {
const GrBlurredEdgeFP& that = other.cast<GrBlurredEdgeFP>();
return that.fMode == fMode;
}
void GrBlurredEdgeFP::onComputeInvariantOutput(GrInvariantOutput* inout) const {
inout->mulByUnknownFourComponents();
}
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