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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkNormalSourcePriv_DEFINED
#define SkNormalSourcePriv_DEFINED
#if SK_SUPPORT_GPU
#include "glsl/GrGLSLFragmentProcessor.h"
#include "glsl/GrGLSLFragmentShaderBuilder.h"
/* GLSLFragmentProcessors for NormalSourceImpls must sub-class this class and override onEmitCode,
* and setNormalData calls, as well as all other calls FPs normally override, except for the 2
* defined in this superclass.
* This class exists to intercept emitCode calls and emit <0, 0, 1> if the FP requires a distance
* vector but the GP doesn't provide it. onSetData calls need to be intercepted too because
* uniform handlers will be invalid in subclasses where onEmitCode isn't called.
* We don't need to adjust the key here since the use of a given GP (through its class ID already in
* the key), will determine what code gets emitted here.
*/
class GLSLNormalFP : public GrGLSLFragmentProcessor {
public:
GLSLNormalFP()
: fDidIntercept(false) {}
void emitCode(EmitArgs& args) final override {
if (args.fFp.usesDistanceVectorField() && !args.fGpImplementsDistanceVector) {
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
fragBuilder->codeAppendf("// GLSLNormalFP intercepted emitCode call, GP does not "
"implement required distance vector feature\n");
fragBuilder->codeAppendf("%s = vec4(0, 0, 1, 0);", args.fOutputColor);
fDidIntercept = true;
} else {
this->onEmitCode(args);
}
}
void onSetData(const GrGLSLProgramDataManager& pdman, const GrProcessor& proc) final override {
if (!fDidIntercept) {
this->setNormalData(pdman, proc);
}
}
protected:
virtual void onEmitCode(EmitArgs& args) = 0;
virtual void setNormalData(const GrGLSLProgramDataManager& pdman, const GrProcessor& proc) = 0;
private:
bool fDidIntercept;
};
#endif
#endif
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