1 // Copyright 2019 The Dawn Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #ifndef DAWNNATIVE_CACHED_OBJECT_H_ 16 #define DAWNNATIVE_CACHED_OBJECT_H_ 17 18 #include <cstddef> 19 20 namespace dawn_native { 21 22 // Some objects are cached so that instead of creating new duplicate objects, 23 // we increase the refcount of an existing object. 24 // When an object is successfully created, the device should call 25 // SetIsCachedReference() and insert the object into the cache. 26 class CachedObject { 27 public: 28 bool IsCachedReference() const; 29 30 // Functor necessary for the unordered_set<CachedObject*>-based cache. 31 struct HashFunc { 32 size_t operator()(const CachedObject* obj) const; 33 }; 34 35 size_t GetContentHash() const; 36 void SetContentHash(size_t contentHash); 37 38 private: 39 friend class DeviceBase; 40 void SetIsCachedReference(); 41 42 bool mIsCachedReference = false; 43 44 // Called by ObjectContentHasher upon creation to record the object. 45 virtual size_t ComputeContentHash() = 0; 46 47 size_t mContentHash = 0; 48 bool mIsContentHashInitialized = false; 49 }; 50 51 } // namespace dawn_native 52 53 #endif // DAWNNATIVE_CACHED_OBJECT_H_ 54