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// Copyright 2019 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef DAWNNATIVE_CACHED_OBJECT_H_
#define DAWNNATIVE_CACHED_OBJECT_H_
#include "dawn_native/ObjectBase.h"
#include <cstddef>
namespace dawn_native {
// Some objects are cached so that instead of creating new duplicate objects,
// we increase the refcount of an existing object.
// When an object is successfully created, the device should call
// SetIsCachedReference() and insert the object into the cache.
class CachedObject : public ObjectBase {
public:
using ObjectBase::ObjectBase;
bool IsCachedReference() const;
// Functor necessary for the unordered_set<CachedObject*>-based cache.
struct HashFunc {
size_t operator()(const CachedObject* obj) const;
};
size_t GetContentHash() const;
void SetContentHash(size_t contentHash);
private:
friend class DeviceBase;
void SetIsCachedReference();
bool mIsCachedReference = false;
// Called by ObjectContentHasher upon creation to record the object.
virtual size_t ComputeContentHash() = 0;
size_t mContentHash = 0;
bool mIsContentHashInitialized = false;
};
} // namespace dawn_native
#endif // DAWNNATIVE_CACHED_OBJECT_H_