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// Copyright 2018 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_INSTANCE_H_
#define DAWNNATIVE_INSTANCE_H_
#include "dawn_native/Adapter.h"
#include "dawn_native/BackendConnection.h"
#include <memory>
#include <vector>
namespace dawn_native {
// This is called InstanceBase for consistency across the frontend, even if the backends don't
// specialize this class.
class InstanceBase final {
public:
InstanceBase() = default;
~InstanceBase() = default;
InstanceBase(const InstanceBase& other) = delete;
InstanceBase& operator=(const InstanceBase& other) = delete;
void DiscoverDefaultAdapters();
bool DiscoverAdapters(const AdapterDiscoveryOptionsBase* options);
const std::vector<std::unique_ptr<AdapterBase>>& GetAdapters() const;
// Used to handle error that happen up to device creation.
bool ConsumedError(MaybeError maybeError);
private:
// Lazily creates connections to all backends that have been compiled.
void EnsureBackendConnections();
// Finds the BackendConnection for `type` or returns an error.
ResultOrError<BackendConnection*> FindBackend(BackendType type);
MaybeError DiscoverAdaptersInternal(const AdapterDiscoveryOptionsBase* options);
bool mBackendsConnected = false;
std::vector<std::unique_ptr<BackendConnection>> mBackends;
std::vector<std::unique_ptr<AdapterBase>> mAdapters;
};
} // namespace dawn_native
#endif // DAWNNATIVE_INSTANCE_H_