/*

 * Copyright 2023 Google LLC

 *

 * Use of this source code is governed by a BSD-style license that can be

 * found in the LICENSE file.

 */

#ifndef skgpu_graphite_BackendSemaphore_DEFINED

#define skgpu_graphite_BackendSemaphore_DEFINED

#include "include/core/SkRefCnt.h"

#include "include/gpu/graphite/GraphiteTypes.h"

#include "include/private/base/SkAnySubclass.h"

namespace skgpu::graphite {

class BackendSemaphoreData;

class SK_API BackendSemaphore {

public:

    BackendSemaphore();

    BackendSemaphore(const BackendSemaphore&);

    ~BackendSemaphore();

    BackendSemaphore& operator=(const BackendSemaphore&);

    bool isValid() const { return fIsValid; }

    BackendApi backend() const { return fBackend; }

private:

    friend class BackendSemaphoreData;

    friend class BackendSemaphorePriv;

    // Size determined by looking at the BackendSemaphoreData subclasses, then

    // guessing-and-checking. Compiler will complain if this is too small - in that case, just

    // increase the number.

    inline constexpr static size_t kMaxSubclassSize = 24;

    using AnyBackendSemaphoreData = SkAnySubclass<BackendSemaphoreData, kMaxSubclassSize>;

    template <typename SomeBackendSemaphoreData>

    BackendSemaphore(BackendApi backend, const SomeBackendSemaphoreData& data)

            : fBackend(backend), fIsValid(true) {

        fSemaphoreData.emplace<SomeBackendSemaphoreData>(data);

    }

    BackendApi fBackend;

    AnyBackendSemaphoreData fSemaphoreData;

    bool fIsValid = false;

};

} // namespace skgpu::graphite

#endif // skgpu_graphite_BackendSemaphore_DEFINED