blob: df95c34ffa6717e8e28b895739cce3ae19764135 [file] [log] [blame]
* Copyright 2022 Google LLC
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef skgpu_graphite_ResourceCache_DEFINED
#define skgpu_graphite_ResourceCache_DEFINED
#include "include/core/SkRefCnt.h"
#include "include/private/SkMutex.h"
#include "include/private/SkTArray.h"
#include "include/private/SkTHash.h"
#include "src/core/SkTDPQueue.h"
#include "src/core/SkTMultiMap.h"
#include "src/gpu/graphite/ResourceTypes.h"
#include <vector>
namespace skgpu {
class SingleOwner;
namespace skgpu::graphite {
class GraphiteResourceKey;
class Resource;
class ResourceCache : public SkRefCnt {
static sk_sp<ResourceCache> Make(SingleOwner*);
~ResourceCache() override;
ResourceCache(const ResourceCache&) = delete;
ResourceCache(ResourceCache&&) = delete;
ResourceCache& operator=(const ResourceCache&) = delete;
ResourceCache& operator=(ResourceCache&&) = delete;
// Returns the number of resources.
int getResourceCount() const {
return fPurgeableQueue.count() + fNonpurgeableResources.count();
void insertResource(Resource*);
// Find a resource that matches a key.
Resource* findAndRefResource(const GraphiteResourceKey& key, SkBudgeted);
// This is a thread safe call. If it fails the ResourceCache is no longer valid and the
// Resource should clean itself up if it is the last ref.
bool returnResource(Resource*, LastRemovedRef);
// Called by the ResourceProvider when it is dropping its ref to the ResourceCache. After this
// is called no more Resources can be returned to the ResourceCache (besides those already in
// the return queue). Also no new Resources can be retrieved from the ResourceCache.
void shutdown();
void forceProcessReturnedResources() { this->processReturnedResources(); }
// Returns the numbers of Resources that can currently be found in the cache. This includes all
// shared Resources and all non-shareable resources that have been returned to the cache.
int numFindableResources() const;
// All these private functions are not meant to be thread safe. We don't check for is single
// owner in them as we assume that has already been checked by the public api calls.
void refAndMakeResourceMRU(Resource*);
void addToNonpurgeableArray(Resource* resource);
void removeFromNonpurgeableArray(Resource* resource);
void removeFromPurgeableQueue(Resource* resource);
void processReturnedResources();
void returnResourceToCache(Resource*, LastRemovedRef);
uint32_t getNextTimestamp();
bool inPurgeableQueue(Resource*) const;
#ifdef SK_DEBUG
bool isInCache(const Resource* r) const;
void validate() const;
void validate() const {}
struct MapTraits {
static const GraphiteResourceKey& GetKey(const Resource& r);
static uint32_t Hash(const GraphiteResourceKey& key);
static void OnFree(Resource*) {}
typedef SkTMultiMap<Resource, GraphiteResourceKey, MapTraits> ResourceMap;
static bool CompareTimestamp(Resource* const& a, Resource* const& b);
static int* AccessResourceIndex(Resource* const& res);
using PurgeableQueue = SkTDPQueue<Resource*, CompareTimestamp, AccessResourceIndex>;
using ResourceArray = SkTDArray<Resource*>;
// 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;
SkDEBUGCODE(int fCount = 0;)
ResourceMap fResourceMap;
SingleOwner* fSingleOwner = nullptr;
bool fIsShutdown = false;
SkMutex fReturnMutex;
using ReturnQueue = std::vector<std::pair<Resource*, LastRemovedRef>>;
ReturnQueue fReturnQueue SK_GUARDED_BY(fReturnMutex);
} // namespace skgpu::graphite
#endif // skgpu_graphite_ResourceCache_DEFINED