| /* |
| * 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 "SkRefCnt.h" |
| #include "SkTArray.h" |
| |
| class GrGpuResourceRef; |
| |
| /** |
| * Base class for GrProcessor. GrDrawState uses this to manage |
| * transitioning a GrProcessor from being owned by a client to being scheduled for execution. It |
| * converts resources owned by the effect from being ref'ed to having pending reads/writes. |
| * |
| * All GrGpuResource objects owned by a GrProgramElement or derived classes (either directly or |
| * indirectly) must be wrapped in a GrGpuResourceRef and registered with the GrProgramElement using |
| * addGpuResource(). This allows the regular refs to be converted to pending IO events |
| * when the program element is scheduled for deferred execution. |
| */ |
| class GrProgramElement : public SkNoncopyable { |
| public: |
| SK_DECLARE_INST_COUNT(GrProgramElement) |
| |
| 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) { |
| if (0 == fPendingExecutions) { |
| SkDELETE(this); |
| return; |
| } else { |
| this->removeRefs(); |
| } |
| } |
| this->validate(); |
| } |
| |
| /** |
| * Gets an id that is unique for this GrProgramElement object. This will never return 0. |
| */ |
| uint32_t getUniqueID() const { return fUniqueID; } |
| |
| void validate() const { |
| #ifdef SK_DEBUG |
| SkASSERT(fRefCnt >= 0); |
| SkASSERT(fPendingExecutions >= 0); |
| SkASSERT(fRefCnt + fPendingExecutions > 0); |
| #endif |
| } |
| |
| protected: |
| GrProgramElement() : fRefCnt(1), fPendingExecutions(0), fUniqueID(CreateUniqueID()) {} |
| |
| /** Subclasses registers their resources using this function. It is assumed the GrProgramResouce |
| is and will remain owned by the subclass and this function will retain a raw ptr. Once a |
| GrGpuResourceRef is registered its setResource must not be called. |
| */ |
| void addGpuResource(const GrGpuResourceRef* res) { |
| fGpuResources.push_back(res); |
| } |
| |
| private: |
| static uint32_t CreateUniqueID(); |
| |
| void addPendingExecution() const { |
| this->validate(); |
| SkASSERT(fRefCnt > 0); |
| if (0 == fPendingExecutions) { |
| this->addPendingIOs(); |
| } |
| ++fPendingExecutions; |
| this->validate(); |
| } |
| |
| void completedExecution() const { |
| this->validate(); |
| --fPendingExecutions; |
| if (0 == fPendingExecutions) { |
| if (0 == fRefCnt) { |
| SkDELETE(this); |
| return; |
| } else { |
| this->pendingIOComplete(); |
| } |
| } |
| this->validate(); |
| } |
| |
| void removeRefs() const; |
| void addPendingIOs() const; |
| void pendingIOComplete() const; |
| |
| mutable int32_t fRefCnt; |
| // Count of deferred executions not yet issued to the 3D API. |
| mutable int32_t fPendingExecutions; |
| uint32_t fUniqueID; |
| |
| SkSTArray<4, const GrGpuResourceRef*, true> fGpuResources; |
| |
| // Only this class can access addPendingExecution() and completedExecution(). |
| template <typename T> friend class GrPendingProgramElement; |
| |
| typedef SkNoncopyable INHERITED; |
| }; |
| |
| #endif |