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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 GrProgramElement_DEFINED
#define GrProgramElement_DEFINED
#include "../private/SkTArray.h"
#include "SkRefCnt.h"
class GrGpuResourceRef;
/**
* Note: We are converting GrProcessor from ref counting to a single owner model using move
* semantics. This class will be removed.
*
* Base class for GrProcessor. This exists to manage transitioning a GrProcessor from being owned by
* a client to being scheduled for execution. While a GrProcessor is ref'ed by drawing code its
* GrGpu resources must also be ref'ed to prevent incorrectly recycling them through the cache.
* However, once the GrProcessor is baked into a GrPipeline and the drawing code has stopped ref'ing
* it, it's internal resources can be recycled in some cases.
*
* We track this using two types of refs on GrProgramElement. A regular ref is owned by any client
* that may continue to issue draws that use the GrProgramElement. The GrPipeline owns "pending
* executions" instead of refs. A pending execution is cleared by ~GrPipeline().
*
* While a GrProgramElement is ref'ed any resources it owns are also ref'ed. However, once it gets
* into the state where it has pending executions AND no refs then it converts its ownership of
* its GrGpuResources from refs to pending IOs. The pending IOs allow the cache to track when it is
* safe to recycle a resource even though we still have buffered GrOps that read or write to the
* the resource.
*
* To make this work the subclass, GrProcessor, implements addPendingIOs and pendingIOComplete. The
* former adds pending reads/writes as appropriate when the processor is recorded in a GrOpList. The
* latter removes them after the op list executes the operation. These calls must propagate to any
* children processors. Similarly, the subclass implements a removeRefs function in order to remove
* refs from resources once the processor is only owned for pending execution.
*/
template<typename DERIVED> class GrProgramElement : public SkNoncopyable {
public:
virtual ~GrProgramElement() {
// fRefCnt can be one when an effect is created statically using GR_CREATE_STATIC_EFFECT
SkASSERT((0 == fRefCnt || 1 == fRefCnt) && 0 == fPendingExecutions);
// Set to invalid values.
SkDEBUGCODE(fRefCnt = fPendingExecutions = -10;)
}
void ref() const {
this->validate();
// Once the ref cnt reaches zero it should never be ref'ed again.
SkASSERT(fRefCnt > 0);
++fRefCnt;
this->validate();
}
void unref() const {
this->validate();
--fRefCnt;
if (0 == fRefCnt) {
this->notifyRefCntIsZero();
if (0 == fPendingExecutions) {
delete this;
return;
} else {
static_cast<const DERIVED*>(this)->removeRefs();
}
}
this->validate();
}
void validate() const {
#ifdef SK_DEBUG
SkASSERT(fRefCnt >= 0);
SkASSERT(fPendingExecutions >= 0);
SkASSERT(fRefCnt + fPendingExecutions > 0);
#endif
}
protected:
GrProgramElement() : fRefCnt(1), fPendingExecutions(0) {}
void addPendingExecution() const {
this->validate();
SkASSERT(fRefCnt > 0);
if (0 == fPendingExecutions) {
static_cast<const DERIVED*>(this)->addPendingIOs();
}
++fPendingExecutions;
this->validate();
}
void completedExecution() const {
this->validate();
--fPendingExecutions;
if (0 == fPendingExecutions) {
if (0 == fRefCnt) {
delete this;
return;
} else {
static_cast<const DERIVED*>(this)->pendingIOComplete();
}
}
this->validate();
}
private:
/** This will be called when the ref cnt is zero. The object may or may not have pending
executions. */
virtual void notifyRefCntIsZero() const = 0;
mutable int32_t fRefCnt;
// Count of deferred executions not yet issued to the 3D API.
mutable int32_t fPendingExecutions;
// Only this class can access addPendingExecution() and completedExecution().
template <typename T> friend class GrPendingProgramElement;
friend class GrProcessorSet;
typedef SkNoncopyable INHERITED;
};
#endif
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