/*

 * 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"

#ifdef SK_METAL

#include "include/gpu/graphite/mtl/MtlGraphiteTypes.h"

#endif

#ifdef SK_VULKAN

#include "include/private/gpu/vk/SkiaVulkan.h"

#endif

namespace skgpu::graphite {

class SK_API BackendSemaphore {

public:

    BackendSemaphore();

#ifdef SK_METAL

    // TODO: Determine creator's responsibility for setting refcnt.

    BackendSemaphore(CFTypeRef mtlEvent, uint64_t value);

#endif

#ifdef SK_VULKAN

    BackendSemaphore(VkSemaphore semaphore);

#endif

    BackendSemaphore(const BackendSemaphore&);

    ~BackendSemaphore();

    BackendSemaphore& operator=(const BackendSemaphore&);

    bool isValid() const { return fIsValid; }

    BackendApi backend() const { return fBackend; }

#ifdef SK_METAL

    CFTypeRef getMtlEvent() const;

    uint64_t getMtlValue() const;

#endif

#ifdef SK_VULKAN

    VkSemaphore getVkSemaphore() const;

#endif

private:

    // TODO: For now, implement as a union until we figure out the plan for this and BackendTexture.

    union {

#ifdef SK_DAWN

        // TODO: WebGPU doesn't seem to have the notion of an Event or Semaphore

#endif

#ifdef SK_METAL

        struct {

            CFTypeRef fMtlEvent;    // Expected to be an id<MTLEvent>

            uint64_t fMtlValue;

        };

#endif

#ifdef SK_VULKAN

        VkSemaphore fVkSemaphore;

#endif

        void* fEnsureUnionNonEmpty;

    };

    bool fIsValid = false;

    BackendApi fBackend;

};

} // namespace skgpu::graphite

#endif // skgpu_graphite_BackendSemaphore_DEFINED