64 lines
2.1 KiB
Plaintext
64 lines
2.1 KiB
Plaintext
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VkSharingMode(3)
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================
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Name
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----
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VkSharingMode - Specifies the mode of resource sharing.
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C Specification
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---------------
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include::../enums/VkSharingMode.txt[]
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Constants
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---------
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ename:VK_SHARING_MODE_EXCLUSIVE::
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Objects created using this sharing mode can only be accessed by queues
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of the same queue family at any given time.
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ename:VK_SHARING_MODE_CONCURRENT::
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Objects created using this sharing mode can be accessed by queues from
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different queue families simultaneously.
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Description
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-----------
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The constants of this enumeration are used to specify the intended resource
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sharing mode used by a buffer or image object.
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Buffers and images created using ename:VK_SHARING_MODE_EXCLUSIVE can only
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be accessed by queues of the same queue family at any given time. Before
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being able to access the object using a queue from a different queue family
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the application has to transfer exclusive ownership of the object between
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the source and destination queue families. In order to do that the
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application has to perform the following operations:
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1. Release exclusive ownership from the source queue family to the destination queue family.
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2. Use semaphores to ensure proper execution control for the ownership transfer.
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3. Acquire exclusive ownership for the destination queue family from the source queue family.
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To release exclusive ownership the application should execute an image
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memory barrier (see slink:VkImageMemoryBarrier) on a queue from the source
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queue family where it must set the ptext:srcQueueFamilyIndex parameter of
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the barrier to the source queue family's index, and the
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ptext:dstQueueFamilyIndex parameter of the barrier to the destination queue
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family's index.
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To acquire exclusive ownership the application should execute the same image
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memory barrier on a queue from the destination queue family.
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Buffers and images created using ename:VK_SHARING_MODE_CONCURRENT can be
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simultaneously accessed by queues from different queue families. Accesses of
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buffers and images created using this sharing mode may have lower performance
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characteristics.
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See Also
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--------
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slink:VkImageCreateInfo, slink:VkBufferCreateInfo
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include::footer.txt[]
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