128 lines
3.7 KiB
C++
128 lines
3.7 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 "SkRefCnt.h"
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#include "SkTArray.h"
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class GrGpuResourceRef;
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/**
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* Base class for GrProcessor. GrDrawState uses this to manage
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* transitioning a GrProcessor from being owned by a client to being scheduled for execution. It
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* converts resources owned by the effect from being ref'ed to having pending reads/writes.
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*
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* All GrGpuResource objects owned by a GrProgramElement or derived classes (either directly or
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* indirectly) must be wrapped in a GrGpuResourceRef and registered with the GrProgramElement using
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* addGpuResource(). This allows the regular refs to be converted to pending IO events
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* when the program element is scheduled for deferred execution.
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*/
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class GrProgramElement : public SkNoncopyable {
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public:
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SK_DECLARE_INST_COUNT_ROOT(GrProgramElement)
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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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if (0 == fPendingExecutions) {
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SkDELETE(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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/**
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* Gets an id that is unique for this GrProgramElement object. This will never return 0.
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*/
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uint32_t getUniqueID() const { return fUniqueID; }
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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), fUniqueID(CreateUniqueID()) {}
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/** Subclasses registers their resources using this function. It is assumed the GrProgramResouce
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is and will remain owned by the subclass and this function will retain a raw ptr. Once a
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GrGpuResourceRef is registered its setResource must not be called.
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*/
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void addGpuResource(const GrGpuResourceRef* res) {
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fGpuResources.push_back(res);
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}
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private:
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static uint32_t CreateUniqueID();
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void addPendingExecution() const {
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this->validate();
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SkASSERT(fRefCnt > 0);
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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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SkDELETE(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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void removeRefs() const;
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void addPendingIOs() const;
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void pendingIOComplete() const;
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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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uint32_t fUniqueID;
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SkSTArray<4, const GrGpuResourceRef*, true> fGpuResources;
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// Only this class can access addPendingExecution() and completedExecution().
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template <typename T> friend class GrPendingProgramElement;
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typedef SkNoncopyable INHERITED;
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};
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#endif
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