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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 GrResourceCache_DEFINED
#define GrResourceCache_DEFINED
#include "include/core/SkRefCnt.h"
#include "include/private/GrResourceKey.h"
#include "include/private/SkTArray.h"
#include "include/private/SkTHash.h"
#include "src/core/SkMessageBus.h"
#include "src/core/SkTDPQueue.h"
#include "src/core/SkTInternalLList.h"
#include "src/core/SkTMultiMap.h"
#include "src/gpu/GrGpuResource.h"
#include "src/gpu/GrGpuResourceCacheAccess.h"
#include "src/gpu/GrGpuResourcePriv.h"
class GrCaps;
class GrProxyProvider;
class SkString;
class SkTraceMemoryDump;
class GrSingleOwner;
class GrTexture;
class GrThreadSafeCache;
struct GrTextureFreedMessage {
GrTexture* fTexture;
uint32_t fOwningUniqueID;
static inline bool SkShouldPostMessageToBus(
const GrTextureFreedMessage& msg, uint32_t msgBusUniqueID) {
// The inbox's ID is the unique ID of the owning GrContext.
return msgBusUniqueID == msg.fOwningUniqueID;
* Manages the lifetime of all GrGpuResource instances.
* Resources may have optionally have two types of keys:
* 1) A scratch key. This is for resources whose allocations are cached but not their contents.
* Multiple resources can share the same scratch key. This is so a caller can have two
* resource instances with the same properties (e.g. multipass rendering that ping-pongs
* between two temporary surfaces). The scratch key is set at resource creation time and
* should never change. Resources need not have a scratch key.
* 2) A unique key. This key's meaning is specific to the domain that created the key. Only one
* resource may have a given unique key. The unique key can be set, cleared, or changed
* anytime after resource creation.
* A unique key always takes precedence over a scratch key when a resource has both types of keys.
* If a resource has neither key type then it will be deleted as soon as the last reference to it
* is dropped.
class GrResourceCache {
GrResourceCache(GrSingleOwner* owner, uint32_t contextUniqueID);
// Default maximum number of bytes of gpu memory of budgeted resources in the cache.
static const size_t kDefaultMaxSize = 256 * (1 << 20);
/** Used to access functionality needed by GrGpuResource for lifetime management. */
class ResourceAccess;
ResourceAccess resourceAccess();
/** Unique ID of the owning GrContext. */
uint32_t contextUniqueID() const { return fContextUniqueID; }
/** Sets the max gpu memory byte size of the cache. */
void setLimit(size_t bytes);
* Returns the number of resources.
int getResourceCount() const {
return fPurgeableQueue.count() + fNonpurgeableResources.count();
* Returns the number of resources that count against the budget.
int getBudgetedResourceCount() const { return fBudgetedCount; }
* Returns the number of bytes consumed by resources.
size_t getResourceBytes() const { return fBytes; }
* Returns the number of bytes held by unlocked resources which are available for purging.
size_t getPurgeableBytes() const { return fPurgeableBytes; }
* Returns the number of bytes consumed by budgeted resources.
size_t getBudgetedResourceBytes() const { return fBudgetedBytes; }
* Returns the number of bytes consumed by cached resources.
size_t getMaxResourceBytes() const { return fMaxBytes; }
* Abandons the backend API resources owned by all GrGpuResource objects and removes them from
* the cache.
void abandonAll();
* Releases the backend API resources owned by all GrGpuResource objects and removes them from
* the cache.
void releaseAll();
* Find a resource that matches a scratch key.
GrGpuResource* findAndRefScratchResource(const GrScratchKey& scratchKey);
#ifdef SK_DEBUG
// This is not particularly fast and only used for validation, so debug only.
int countScratchEntriesForKey(const GrScratchKey& scratchKey) const {
return fScratchMap.countForKey(scratchKey);
* Find a resource that matches a unique key.
GrGpuResource* findAndRefUniqueResource(const GrUniqueKey& key) {
GrGpuResource* resource = fUniqueHash.find(key);
if (resource) {
return resource;
* Query whether a unique key exists in the cache.
bool hasUniqueKey(const GrUniqueKey& key) const {
return SkToBool(fUniqueHash.find(key));
/** Purges resources to become under budget and processes resources with invalidated unique
keys. */
void purgeAsNeeded();
/** Purges all resources that don't have external owners. */
void purgeAllUnlocked() { this->purgeUnlockedResources(false); }
// Purge unlocked resources. If 'scratchResourcesOnly' is true the purgeable resources
// containing persistent data are spared. If it is false then all purgeable resources will
// be deleted.
void purgeUnlockedResources(bool scratchResourcesOnly);
/** Purge all resources not used since the passed in time. */
void purgeResourcesNotUsedSince(GrStdSteadyClock::time_point);
bool overBudget() const { return fBudgetedBytes > fMaxBytes; }
* Purge unlocked resources from the cache until the the provided byte count has been reached
* or we have purged all unlocked resources. The default policy is to purge in LRU order, but
* can be overridden to prefer purging scratch resources (in LRU order) prior to purging other
* resource types.
* @param maxBytesToPurge the desired number of bytes to be purged.
* @param preferScratchResources If true scratch resources will be purged prior to other
* resource types.
void purgeUnlockedResources(size_t bytesToPurge, bool preferScratchResources);
/** Returns true if the cache would like a flush to occur in order to make more resources
purgeable. */
bool requestsFlush() const;
/** Maintain a ref to this texture until we receive a GrTextureFreedMessage. */
void insertDelayedTextureUnref(GrTexture*);
struct Stats {
int fTotal;
int fNumPurgeable;
int fNumNonPurgeable;
int fScratch;
int fWrapped;
size_t fUnbudgetedSize;
Stats() { this->reset(); }
void reset() {
fTotal = 0;
fNumPurgeable = 0;
fNumNonPurgeable = 0;
fScratch = 0;
fWrapped = 0;
fUnbudgetedSize = 0;
void update(GrGpuResource* resource) {
if (resource->cacheAccess().isScratch()) {
if (resource->resourcePriv().refsWrappedObjects()) {
if (GrBudgetedType::kBudgeted != resource->resourcePriv().budgetedType()) {
fUnbudgetedSize += resource->gpuMemorySize();
void getStats(Stats*) const;
void dumpStats(SkString*) const;
void dumpStatsKeyValuePairs(SkTArray<SkString>* keys, SkTArray<double>* value) const;
#ifdef SK_DEBUG
int countUniqueKeysWithTag(const char* tag) const;
// This function is for unit testing and is only defined in test tools.
void changeTimestamp(uint32_t newTimestamp);
// Enumerates all cached resources and dumps their details to traceMemoryDump.
void dumpMemoryStatistics(SkTraceMemoryDump* traceMemoryDump) const;
void setProxyProvider(GrProxyProvider* proxyProvider) { fProxyProvider = proxyProvider; }
void setThreadSafeCache(GrThreadSafeCache* threadSafeCache) {
fThreadSafeCache = threadSafeCache;
/// @name Methods accessible via ResourceAccess
void insertResource(GrGpuResource*);
void removeResource(GrGpuResource*);
void notifyARefCntReachedZero(GrGpuResource*, GrGpuResource::LastRemovedRef);
void changeUniqueKey(GrGpuResource*, const GrUniqueKey&);
void removeUniqueKey(GrGpuResource*);
void willRemoveScratchKey(const GrGpuResource*);
void didChangeBudgetStatus(GrGpuResource*);
void refResource(GrGpuResource* resource);
/// @}
void refAndMakeResourceMRU(GrGpuResource*);
void processFreedGpuResources();
void addToNonpurgeableArray(GrGpuResource*);
void removeFromNonpurgeableArray(GrGpuResource*);
bool wouldFit(size_t bytes) const { return fBudgetedBytes+bytes <= fMaxBytes; }
uint32_t getNextTimestamp();
#ifdef SK_DEBUG
bool isInCache(const GrGpuResource* r) const;
void validate() const;
void validate() const {}
class AutoValidate;
class AvailableForScratchUse;
struct ScratchMapTraits {
static const GrScratchKey& GetKey(const GrGpuResource& r) {
return r.resourcePriv().getScratchKey();
static uint32_t Hash(const GrScratchKey& key) { return key.hash(); }
static void OnFree(GrGpuResource*) { }
typedef SkTMultiMap<GrGpuResource, GrScratchKey, ScratchMapTraits> ScratchMap;
struct UniqueHashTraits {
static const GrUniqueKey& GetKey(const GrGpuResource& r) { return r.getUniqueKey(); }
static uint32_t Hash(const GrUniqueKey& key) { return key.hash(); }
typedef SkTDynamicHash<GrGpuResource, GrUniqueKey, UniqueHashTraits> UniqueHash;
class TextureAwaitingUnref {
TextureAwaitingUnref(GrTexture* texture);
TextureAwaitingUnref(const TextureAwaitingUnref&) = delete;
TextureAwaitingUnref& operator=(const TextureAwaitingUnref&) = delete;
TextureAwaitingUnref& operator=(TextureAwaitingUnref&&);
void addRef();
void unref();
bool finished();
GrTexture* fTexture = nullptr;
int fNumUnrefs = 0;
using TexturesAwaitingUnref = SkTHashMap<uint32_t, TextureAwaitingUnref>;
static bool CompareTimestamp(GrGpuResource* const& a, GrGpuResource* const& b) {
return a->cacheAccess().timestamp() < b->cacheAccess().timestamp();
static int* AccessResourceIndex(GrGpuResource* const& res) {
return res->cacheAccess().accessCacheIndex();
typedef SkMessageBus<GrUniqueKeyInvalidatedMessage>::Inbox InvalidUniqueKeyInbox;
typedef SkMessageBus<GrTextureFreedMessage>::Inbox FreedTextureInbox;
typedef SkTDPQueue<GrGpuResource*, CompareTimestamp, AccessResourceIndex> PurgeableQueue;
typedef SkTDArray<GrGpuResource*> ResourceArray;
GrProxyProvider* fProxyProvider = nullptr;
GrThreadSafeCache* fThreadSafeCache = nullptr;
// Whenever a resource is added to the cache or the result of a cache lookup, fTimestamp is
// assigned as the resource's timestamp and then incremented. fPurgeableQueue orders the
// purgeable resources by this value, and thus is used to purge resources in LRU order.
uint32_t fTimestamp = 0;
PurgeableQueue fPurgeableQueue;
ResourceArray fNonpurgeableResources;
// This map holds all resources that can be used as scratch resources.
ScratchMap fScratchMap;
// This holds all resources that have unique keys.
UniqueHash fUniqueHash;
// our budget, used in purgeAsNeeded()
size_t fMaxBytes = kDefaultMaxSize;
int fHighWaterCount = 0;
size_t fHighWaterBytes = 0;
int fBudgetedHighWaterCount = 0;
size_t fBudgetedHighWaterBytes = 0;
// our current stats for all resources
SkDEBUGCODE(int fCount = 0;)
size_t fBytes = 0;
// our current stats for resources that count against the budget
int fBudgetedCount = 0;
size_t fBudgetedBytes = 0;
size_t fPurgeableBytes = 0;
int fNumBudgetedResourcesFlushWillMakePurgeable = 0;
InvalidUniqueKeyInbox fInvalidUniqueKeyInbox;
FreedTextureInbox fFreedTextureInbox;
TexturesAwaitingUnref fTexturesAwaitingUnref;
uint32_t fContextUniqueID = SK_InvalidUniqueID;
GrSingleOwner* fSingleOwner = nullptr;
// This resource is allowed to be in the nonpurgeable array for the sake of validate() because
// we're in the midst of converting it to purgeable status.
SkDEBUGCODE(GrGpuResource* fNewlyPurgeableResourceForValidation = nullptr;)
class GrResourceCache::ResourceAccess {
ResourceAccess(GrResourceCache* cache) : fCache(cache) { }
ResourceAccess(const ResourceAccess& that) : fCache(that.fCache) { }
ResourceAccess& operator=(const ResourceAccess&) = delete;
* Insert a resource into the cache.
void insertResource(GrGpuResource* resource) { fCache->insertResource(resource); }
* Removes a resource from the cache.
void removeResource(GrGpuResource* resource) { fCache->removeResource(resource); }
* Adds a ref to a resource with proper tracking if the resource has 0 refs prior to
* adding the ref.
void refResource(GrGpuResource* resource) { fCache->refResource(resource); }
* Notifications that should be sent to the cache when the ref/io cnt status of resources
* changes.
enum RefNotificationFlags {
/** All types of refs on the resource have reached zero. */
kAllCntsReachedZero_RefNotificationFlag = 0x1,
/** The normal (not pending IO type) ref cnt has reached zero. */
kRefCntReachedZero_RefNotificationFlag = 0x2,
* Called by GrGpuResources when they detect one of their ref cnts have reached zero. This may
* either be the main ref or the command buffer usage ref.
void notifyARefCntReachedZero(GrGpuResource* resource,
GrGpuResource::LastRemovedRef removedRef) {
fCache->notifyARefCntReachedZero(resource, removedRef);
* Called by GrGpuResources to change their unique keys.
void changeUniqueKey(GrGpuResource* resource, const GrUniqueKey& newKey) {
fCache->changeUniqueKey(resource, newKey);
* Called by a GrGpuResource to remove its unique key.
void removeUniqueKey(GrGpuResource* resource) { fCache->removeUniqueKey(resource); }
* Called by a GrGpuResource when it removes its scratch key.
void willRemoveScratchKey(const GrGpuResource* resource) {
* Called by GrGpuResources when they change from budgeted to unbudgeted or vice versa.
void didChangeBudgetStatus(GrGpuResource* resource) { fCache->didChangeBudgetStatus(resource); }
// No taking addresses of this type.
const ResourceAccess* operator&() const;
ResourceAccess* operator&();
GrResourceCache* fCache;
friend class GrGpuResource; // To access all the proxy inline methods.
friend class GrResourceCache; // To create this type.
inline GrResourceCache::ResourceAccess GrResourceCache::resourceAccess() {
return ResourceAccess(this);