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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrGeometryProcessor_DEFINED
#define GrGeometryProcessor_DEFINED
#include "GrEffect.h"
/**
* If an effect needs specialized vertex shader code, then it must inherit from this class.
* Otherwise it won't be able to add vertex attribs, and it will be given a vertexless shader
* program in emitCode.
*/
class GrGeometryProcessor : public GrEffect {
public:
GrGeometryProcessor() { fRequiresVertexShader = true; }
protected:
/**
* Subclasses call this from their constructor to register vertex attributes (at most
* kMaxVertexAttribs). This must only be called from the constructor because GrEffects are
* immutable.
*
* We return a reference to the added var so that derived classes can name it nicely and use it
* in shader code.
*/
const GrShaderVar& addVertexAttrib(const GrShaderVar& var) {
SkASSERT(GrShaderVar::kAttribute_TypeModifier == var.getTypeModifier());
SkASSERT(fVertexAttribs.count() < kMaxVertexAttribs);
return fVertexAttribs.push_back(var);
}
private:
typedef GrEffect INHERITED;
};
#endif
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