| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef GrManagedResource_DEFINED |
| #define GrManagedResource_DEFINED |
| |
| #include "include/private/base/SkMutex.h" |
| #include "src/base/SkRandom.h" |
| #include "src/core/SkTHash.h" |
| #include "src/gpu/ganesh/GrSurface.h" |
| #include <atomic> |
| |
| class GrTexture; |
| |
| // uncomment to enable tracing of resource refs |
| #ifdef SK_DEBUG |
| #define SK_TRACE_MANAGED_RESOURCES |
| #endif |
| |
| /** \class GrManagedResource |
| |
| GrManagedResource is the base class for GPU resources that may be shared by |
| multiple objects, in particular objects that are tracked by a command buffer. |
| When an existing owner wants to share a reference, it calls ref(). |
| When an owner wants to release its reference, it calls unref(). When the |
| shared object's reference count goes to zero as the result of an unref() |
| call, its (virtual) destructor is called. It is an error for the |
| destructor to be called explicitly (or via the object going out of scope on |
| the stack or calling delete) if getRefCnt() > 1. |
| |
| This is nearly identical to SkRefCntBase. The exceptions are that unref() |
| takes a GrGpu, and any derived classes must implement freeGPUData(). |
| */ |
| |
| class GrManagedResource : SkNoncopyable { |
| public: |
| // Simple refCount tracing, to ensure that everything ref'ed is unref'ed. |
| #ifdef SK_TRACE_MANAGED_RESOURCES |
| struct Hash { |
| uint32_t operator()(const GrManagedResource* const& r) const { |
| SkASSERT(r); |
| return r->fKey; |
| } |
| }; |
| |
| class Trace { |
| public: |
| ~Trace() { |
| fHashSet.foreach([](const GrManagedResource* r) { |
| r->dumpInfo(); |
| }); |
| SkASSERT(0 == fHashSet.count()); |
| } |
| |
| void add(const GrManagedResource* r) { |
| SkAutoMutexExclusive locked(fLock); |
| fHashSet.add(r); |
| } |
| |
| void remove(const GrManagedResource* r) { |
| SkAutoMutexExclusive locked(fLock); |
| fHashSet.remove(r); |
| } |
| |
| private: |
| SkMutex fLock; |
| skia_private::THashSet<const GrManagedResource*, GrManagedResource::Hash> fHashSet |
| SK_GUARDED_BY(fLock); |
| }; |
| |
| static std::atomic<uint32_t> fKeyCounter; |
| #endif |
| |
| /** Default construct, initializing the reference count to 1. |
| */ |
| GrManagedResource() : fRefCnt(1) { |
| #ifdef SK_TRACE_MANAGED_RESOURCES |
| fKey = fKeyCounter.fetch_add(+1, std::memory_order_relaxed); |
| GetTrace()->add(this); |
| #endif |
| } |
| |
| /** Destruct, asserting that the reference count is 1. |
| */ |
| virtual ~GrManagedResource() { |
| #ifdef SK_DEBUG |
| auto count = this->getRefCnt(); |
| SkASSERTF(count == 1, "fRefCnt was %d", count); |
| fRefCnt.store(0); // illegal value, to catch us if we reuse after delete |
| #endif |
| } |
| |
| #ifdef SK_DEBUG |
| /** Return the reference count. Use only for debugging. */ |
| int32_t getRefCnt() const { return fRefCnt.load(); } |
| #endif |
| |
| /** May return true if the caller is the only owner. |
| * Ensures that all previous owner's actions are complete. |
| */ |
| bool unique() const { |
| // The acquire barrier is only really needed if we return true. It |
| // prevents code conditioned on the result of unique() from running |
| // until previous owners are all totally done calling unref(). |
| return 1 == fRefCnt.load(std::memory_order_acquire); |
| } |
| |
| /** Increment the reference count. |
| Must be balanced by a call to unref() or unrefAndFreeResources(). |
| */ |
| void ref() const { |
| // No barrier required. |
| SkDEBUGCODE(int newRefCount = )fRefCnt.fetch_add(+1, std::memory_order_relaxed); |
| SkASSERT(newRefCount >= 1); |
| } |
| |
| /** Decrement the reference count. If the reference count is 1 before the |
| decrement, then delete the object. Note that if this is the case, then |
| the object needs to have been allocated via new, and not on the stack. |
| Any GPU data associated with this resource will be freed before it's deleted. |
| */ |
| void unref() const { |
| // A release here acts in place of all releases we "should" have been doing in ref(). |
| int newRefCount = fRefCnt.fetch_add(-1, std::memory_order_acq_rel); |
| SkASSERT(newRefCount >= 0); |
| if (newRefCount == 1) { |
| // Like unique(), the acquire is only needed on success, to make sure |
| // code in internal_dispose() doesn't happen before the decrement. |
| this->internal_dispose(); |
| } |
| } |
| |
| #ifdef SK_DEBUG |
| // This is used for validating in the vulkan backend when using a main command buffer and temp |
| // command buffer at the same time. We need to validate that no images in the temp command |
| // buffer have been used in the main command buffer. |
| virtual const GrManagedResource* asVkImageResource() const { return nullptr; } |
| #endif |
| |
| #ifdef SK_DEBUG |
| void validate() const { |
| SkASSERT(this->getRefCnt() > 0); |
| } |
| #endif |
| |
| #ifdef SK_TRACE_MANAGED_RESOURCES |
| /** Output a human-readable dump of this resource's information |
| */ |
| virtual void dumpInfo() const = 0; |
| #endif |
| |
| private: |
| #ifdef SK_TRACE_MANAGED_RESOURCES |
| static Trace* GetTrace() { |
| static Trace kTrace; |
| return &kTrace; |
| } |
| #endif |
| |
| /** Must be implemented by any subclasses. |
| * Deletes any GPU data associated with this resource |
| */ |
| virtual void freeGPUData() const = 0; |
| |
| /** |
| * Called when the ref count goes to 0. Will free GPU resources. |
| */ |
| void internal_dispose() const { |
| this->freeGPUData(); |
| #ifdef SK_TRACE_MANAGED_RESOURCES |
| GetTrace()->remove(this); |
| #endif |
| |
| #ifdef SK_DEBUG |
| SkASSERT(0 == this->getRefCnt()); |
| fRefCnt.store(1); |
| #endif |
| delete this; |
| } |
| |
| mutable std::atomic<int32_t> fRefCnt; |
| #ifdef SK_TRACE_MANAGED_RESOURCES |
| uint32_t fKey; |
| #endif |
| |
| using INHERITED = SkNoncopyable; |
| }; |
| |
| // This subclass allows for recycling |
| class GrRecycledResource : public GrManagedResource { |
| public: |
| // When recycle is called and there is only one ref left on the resource, we will signal that |
| // the resource can be recycled for reuse. If the subclass (or whoever is managing this resource) |
| // decides not to recycle the objects, it is their responsibility to call unref on the object. |
| void recycle() const { |
| if (this->unique()) { |
| this->onRecycle(); |
| } else { |
| this->unref(); |
| } |
| } |
| |
| private: |
| virtual void onRecycle() const = 0; |
| }; |
| |
| /** \class GrTextureResource |
| |
| GrTextureResource is the base class for managed texture resources, and implements the |
| basic releaseProc functionality for them. |
| |
| */ |
| class GrTextureResource : public GrManagedResource { |
| public: |
| GrTextureResource() {} |
| |
| ~GrTextureResource() override { |
| SkASSERT(!fReleaseHelper); |
| } |
| |
| void setRelease(sk_sp<GrSurface::RefCntedReleaseProc> releaseHelper) { |
| fReleaseHelper = std::move(releaseHelper); |
| } |
| |
| protected: |
| mutable sk_sp<GrSurface::RefCntedReleaseProc> fReleaseHelper; |
| |
| void invokeReleaseProc() const { |
| if (fReleaseHelper) { |
| // Depending on the ref count of fReleaseHelper this may or may not actually trigger |
| // the ReleaseProc to be called. |
| fReleaseHelper.reset(); |
| } |
| } |
| |
| private: |
| using INHERITED = GrManagedResource; |
| }; |
| |
| #endif |