d61c9d93b1
This will allow different subclasses to use different models for lifetime management. GrXferProcessor moves to simple ref counting since they don't own GrGpuResources. This also constifies GrXferProcessor factories. Change-Id: I6bea0ea8de718874063224232f9da50887868b16 Reviewed-on: https://skia-review.googlesource.com/11792 Commit-Queue: Brian Salomon <bsalomon@google.com> Reviewed-by: Brian Osman <brianosman@google.com>
129 lines
4.3 KiB
C++
129 lines
4.3 KiB
C++
/*
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* Copyright 2014 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef GrProgramElement_DEFINED
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#define GrProgramElement_DEFINED
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#include "../private/SkTArray.h"
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#include "SkRefCnt.h"
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class GrGpuResourceRef;
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/**
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* Note: We are converting GrProcessor from ref counting to a single owner model using move
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* semantics. This class will be removed.
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*
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* This is used to track "refs" for two separate types GrProcessor ownership. A regular ref is owned
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* by any client that may continue to issue draws that use the GrProgramElement. A recorded op or
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* GrPipeline uses "pending executions" instead of refs. A pending execution is cleared after the
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* draw is executed (or aborted).
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*
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* While a GrProgramElement is ref'ed any resources it owns are also ref'ed. However, once it gets
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* into the state where it has pending executions AND no refs then it converts its ownership of
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* its GrGpuResources from refs to pending IOs. The pending IOs allow the cache to track when it is
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* safe to recycle a resource even though we still have buffered GrOps that read or write to the
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* the resource.
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*
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* To make this work the subclass GrProcessor implements addPendingIOs, removeRefs, and
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* pendingIOComplete. addPendingIOs adds pending reads/writes to GrGpuResources owned by the
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* processor as appropriate when the processor is recorded in a GrOpList. removeRefs is called when
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* the ref count reaches 0 and the GrProcessor is only owned by "pending executions".
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* pendingIOComplete occurs if the resource is still owned by a ref but all recorded draws have been
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* completed. Whenever pending executions and refs reach zero the processor is deleted.
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*
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* The GrProcessor may also implement notifyRefCntIsZero in order to change its ownership of child
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* processors from ref to pending execution when the processor is first owned exclusively in pending
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* execution mode.
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*/
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class GrProgramElement : public SkNoncopyable {
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public:
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virtual ~GrProgramElement() {
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// fRefCnt can be one when an effect is created statically using GR_CREATE_STATIC_EFFECT
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SkASSERT((0 == fRefCnt || 1 == fRefCnt) && 0 == fPendingExecutions);
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// Set to invalid values.
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SkDEBUGCODE(fRefCnt = fPendingExecutions = -10;)
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}
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void ref() const {
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this->validate();
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// Once the ref cnt reaches zero it should never be ref'ed again.
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SkASSERT(fRefCnt > 0);
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++fRefCnt;
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this->validate();
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}
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void unref() const {
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this->validate();
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--fRefCnt;
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if (0 == fRefCnt) {
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this->notifyRefCntIsZero();
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if (0 == fPendingExecutions) {
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delete this;
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return;
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} else {
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this->removeRefs();
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}
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}
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this->validate();
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}
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void validate() const {
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#ifdef SK_DEBUG
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SkASSERT(fRefCnt >= 0);
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SkASSERT(fPendingExecutions >= 0);
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SkASSERT(fRefCnt + fPendingExecutions > 0);
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#endif
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}
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protected:
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GrProgramElement() : fRefCnt(1), fPendingExecutions(0) {}
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void addPendingExecution() const {
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this->validate();
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if (0 == fPendingExecutions) {
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this->addPendingIOs();
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}
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++fPendingExecutions;
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this->validate();
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}
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void completedExecution() const {
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this->validate();
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--fPendingExecutions;
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if (0 == fPendingExecutions) {
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if (0 == fRefCnt) {
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delete this;
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return;
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} else {
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this->pendingIOComplete();
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}
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}
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this->validate();
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}
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private:
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virtual void addPendingIOs() const = 0;
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virtual void removeRefs() const = 0;
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virtual void pendingIOComplete() const = 0;
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/** This will be called when the ref cnt is zero. The object may or may not have pending
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executions. */
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virtual void notifyRefCntIsZero() const = 0;
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mutable int32_t fRefCnt;
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// Count of deferred executions not yet issued to the 3D API.
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mutable int32_t fPendingExecutions;
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// Only these classes can access addPendingExecution() and completedExecution().
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template <typename T> friend class GrPendingProgramElement;
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friend class GrProcessorSet;
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typedef SkNoncopyable INHERITED;
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};
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#endif
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