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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrPendingProgramElement_DEFINED
#define GrPendingProgramElement_DEFINED
#include "SkRefCnt.h"
#include "GrTypes.h"
/**
* Helper for owning a pending execution on a GrProgramElement. Using this rather than ref allows
* resources that are owned by the program element to be correctly tracked as having pending reads
* and writes rather than refs.
*/
template <typename T> class GrPendingProgramElement : SkNoncopyable {
public:
GrPendingProgramElement() : fObj(NULL) { };
// Adds a pending execution on obj.
explicit GrPendingProgramElement(T* obj) : fObj(obj) {
if (obj) {
obj->addPendingExecution();
}
}
void reset(T* obj) {
if (obj) {
obj->addPendingExecution();
}
if (fObj) {
fObj->completedExecution();
}
fObj = obj;
}
T* get() const { return fObj; }
operator T*() { return fObj; }
T *operator->() const { return fObj; }
~GrPendingProgramElement() {
if (fObj) {
fObj->completedExecution();
}
}
private:
T* fObj;
typedef SkNoncopyable INHERITED;
};
#endif
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