src/dawn/native/BackendConnection.h

// Copyright 2018 The Dawn & Tint Authors
//
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#ifndef SRC_DAWN_NATIVE_BACKENDCONNECTION_H_
#define SRC_DAWN_NATIVE_BACKENDCONNECTION_H_

#include <memory>
#include <vector>

#include "dawn/common/NonCopyable.h"
#include "dawn/native/DawnNative.h"
#include "dawn/native/PhysicalDevice.h"
#include "dawn/native/Toggles.h"
#include "partition_alloc/pointers/raw_ptr.h"

namespace dawn::native {

// An common interface for all backends. Mostly used to create adapters for a particular
// backend.
class BackendConnection : NonMovable {
  public:
    BackendConnection(InstanceBase* instance, wgpu::BackendType type);
    virtual ~BackendConnection() = default;

    wgpu::BackendType GetType() const;
    InstanceBase* GetInstance() const;

    // Returns physical devices capable of supporting the `options`.
    // Calling this multiple times in succession should return a vector with duplicate
    // references to the same PhysicalDevices (i.e. the backend should cache them).
    virtual std::vector<Ref<PhysicalDeviceBase>> DiscoverPhysicalDevices(
        const UnpackedPtr<RequestAdapterOptions>& options) = 0;

    // Clear all internal refs to physical devices.
    virtual void ClearPhysicalDevices() = 0;

    // Get the number of internally-referenced physical devices, for testing.
    virtual size_t GetPhysicalDeviceCountForTesting() const = 0;

  private:
    raw_ptr<InstanceBase> mInstance = nullptr;
    wgpu::BackendType mType;
};

}  // namespace dawn::native

#endif  // SRC_DAWN_NATIVE_BACKENDCONNECTION_H_