# VkExportMetalSharedEventInfoEXT(3) Manual Page

## Name

VkExportMetalSharedEventInfoEXT - Structure that identifies a VkSemaphore or VkEvent object and corresponding Metal MTLSharedEvent object

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## C Specification

To export the Metal `MTLSharedEvent` object underlying a VkSemaphore or VkEvent object, include a `VkExportMetalSharedEventInfoEXT` structure in the `pNext` chain of the `pMetalObjectsInfo` parameter of a vkExportMetalObjectsEXT call.

The `VkExportMetalSharedEventInfoEXT` structure is defined as:

    // Provided by VK_EXT_metal_objects
    typedef struct VkExportMetalSharedEventInfoEXT {
        VkStructureType      sType;
        const void*          pNext;
        VkSemaphore          semaphore;
        VkEvent              event;
        MTLSharedEvent_id    mtlSharedEvent;
    } VkExportMetalSharedEventInfoEXT;

## Members

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `semaphore` is VK_NULL_HANDLE or a VkSemaphore.

- `event` is VK_NULL_HANDLE or a VkEvent.

- `mtlSharedEvent` is the Metal `id<MTLSharedEvent>` object underlying the VkSemaphore or VkEvent object in `semaphore` or `event`, respectively. The implementation will return the `MTLSharedEvent` in this member, or it will return `NULL` if no `MTLSharedEvent` could be found underlying the VkSemaphore or VkEvent object.

## Description

Valid Usage (Implicit)

- VUID-VkExportMetalSharedEventInfoEXT-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_EXPORT_METAL_SHARED_EVENT_INFO_EXT`

- VUID-VkExportMetalSharedEventInfoEXT-semaphore-parameter
  If `semaphore` is not VK_NULL_HANDLE, `semaphore` must be a valid VkSemaphore handle

- VUID-VkExportMetalSharedEventInfoEXT-event-parameter
  If `event` is not VK_NULL_HANDLE, `event` must be a valid VkEvent handle

- VUID-VkExportMetalSharedEventInfoEXT-commonparent
  Both of `event`, and `semaphore` that are valid handles of non-ignored parameters must have been created, allocated, or retrieved from the same VkDevice

## See Also

VK_EXT_metal_objects, VkEvent, VkSemaphore, VkStructureType

## Document Notes

For more information, see the Vulkan Specification

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

## Copyright

Copyright 2014-2025 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0