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// Copyright 2022 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 SRC_DAWN_NATIVE_PIPELINECACHE_H_
#define SRC_DAWN_NATIVE_PIPELINECACHE_H_
#include "dawn/common/RefCounted.h"
#include "dawn/native/BlobCache.h"
#include "dawn/native/CacheKey.h"
#include "dawn/native/Error.h"
namespace dawn::native {
// Abstraction layer for backend dependent pipeline caching.
class PipelineCacheBase : public RefCounted {
public:
// Returns whether or not we got a cache hit when initializing.
bool CacheHit() const;
// Serializes and writes the current contents of the backend cache object into the backing
// blob cache, potentially overwriting what is already there. Useful when we are working
// with more monolithic-like caches where we expect overwriting sometimes.
MaybeError Flush();
// Serializes and writes the current contents of the backend cache object into the backing
// blob cache iff the initial read from the backend cache did not result in a hit.
MaybeError FlushIfNeeded();
protected:
PipelineCacheBase(BlobCache* cache, const CacheKey& key);
// Initializes and returns the cached blob given the cache and keys. Used by backend
// implementations to get the cache and set the cache hit state. Should only be called once.
Blob Initialize();
private:
// Backend implementation of serialization of the cache into a blob.
// Note: given that no local cached blob should be destructed and copy elision has strict
// requirement cached blob is passed in as a pointer to be assigned.
virtual MaybeError SerializeToBlobImpl(Blob* blob) = 0;
// The blob cache is owned by the Adapter and pipeline caches are owned/created by devices
// or adapters. Since the device owns a reference to the Instance which owns the Adapter,
// the blob cache is guaranteed to be valid throughout the lifetime of the object.
BlobCache* mCache;
CacheKey mKey;
bool mInitialized = false;
bool mCacheHit = false;
};
} // namespace dawn::native
#endif // SRC_DAWN_NATIVE_PIPELINECACHE_H_