148 lines
5.7 KiB
Plaintext
148 lines
5.7 KiB
Plaintext
// Copyright (c) 2014-2016 Khronos Group. This work is licensed under a
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// Creative Commons Attribution 4.0 International License; see
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// http://creativecommons.org/licenses/by/4.0/
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VkQueueFamilyProperties(3)
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==========================
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Name
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----
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VkQueueFamilyProperties - Structure providing information about a queue family.
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C Specification
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---------------
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// refBegin VkQueueFamilyProperties Structure providing information about a queue family.
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The sname:VkQueueFamilyProperties structure is defined as:
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include::../api/structs/VkQueueFamilyProperties.txt[]
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Members
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-------
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* pname:queueFlags contains flags indicating the capabilities of the
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queues in this queue family.
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* pname:queueCount is the unsigned integer count of queues in this
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queue family.
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* pname:timestampValidBits is the unsigned integer count of meaningful
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bits in the timestamps written via fname:vkCmdWriteTimestamp. The valid
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range for the count is 36..64 bits, or a value of 0, indicating no
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support for timestamps. Bits outside the valid range are guaranteed to
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be zeros.
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* pname:minImageTransferGranularity is the minimum granularity
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supported for image transfer operations on the queues in this queue
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family.
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Description
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-----------
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The bits specified in pname:queueFlags are:
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// refBegin VkQueueFlagBits - Bitmask specifying capabilities of queues in a queue family
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include::../api/enums/VkQueueFlagBits.txt[]
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* if ename:VK_QUEUE_GRAPHICS_BIT is set, then the queues in this queue
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family support graphics operations.
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* if ename:VK_QUEUE_COMPUTE_BIT is set, then the queues in this queue
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family support compute operations.
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* if ename:VK_QUEUE_TRANSFER_BIT is set, then the queues in this queue
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family support transfer operations.
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* if ename:VK_QUEUE_SPARSE_BINDING_BIT is set, then the queues in this
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queue family support sparse memory management operations (see
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<<sparsememory,Sparse Resources>>). If any of the sparse resource
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features are enabled, then at least one queue family must: support this
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bit.
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If an implementation exposes any queue family that supports graphics
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operations, at least one queue family of at least one physical device
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exposed by the implementation must: support both graphics and compute
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operations.
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[NOTE]
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.Note
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====
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All commands that are allowed on a queue that supports transfer operations
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are also allowed on a queue that supports either graphics or compute
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operations thus if the capabilities of a queue family include
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ename:VK_QUEUE_GRAPHICS_BIT or ename:VK_QUEUE_COMPUTE_BIT then
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reporting the ename:VK_QUEUE_TRANSFER_BIT capability separately for that
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queue family is optional:.
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====
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For further details see <<devsandqueues-queues,Queues>>.
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The value returned in pname:minImageTransferGranularity has a unit of
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compressed texel blocks for images having a block-compressed format, and a
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unit of texels otherwise.
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Possible values of pname:minImageTransferGranularity are:
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* latexmath:[$(0,0,0)$] which indicates that only whole mip levels must:
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be transferred using the image transfer operations on the corresponding
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queues. In this case, the following restrictions apply to all offset and
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extent parameters of image transfer operations:
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** The pname:x, pname:y, and pname:z members of a slink:VkOffset3D
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parameter must: always be zero.
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** The pname:width, pname:height, and pname:depth members of a
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slink:VkExtent3D parameter must: always match the width, height, and
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depth of the image subresource corresponding to the parameter,
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respectively.
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* latexmath:[$(Ax, Ay, Az)$] where latexmath:[$Ax$], latexmath:[$Ay$],
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and latexmath:[$Az$] are all integer powers of two. In this case the
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following restrictions apply to all image transfer operations:
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** pname:x, pname:y, and pname:z of a slink:VkOffset3D parameter must: be
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integer multiples of latexmath:[$Ax$], latexmath:[$Ay$], and
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latexmath:[$Az$], respectively.
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** pname:width of a slink:VkExtent3D parameter must: be an integer
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multiple of latexmath:[$Ax$], or else latexmath:[$(x + width)$] must:
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equal the width of the image subresource corresponding to the
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parameter.
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** pname:height of a slink:VkExtent3D parameter must: be an integer
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multiple of latexmath:[$Ay$], or else latexmath:[$(y + height)$] must:
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equal the height of the image subresource corresponding to the
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parameter.
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** pname:depth of a slink:VkExtent3D parameter must: be an integer
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multiple of latexmath:[$Az$], or else latexmath:[$(z + depth)$] must:
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equal the depth of the image subresource corresponding to the
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parameter.
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** If the format of the image corresponding to the parameters is one of
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the block-compressed formats then for the purposes of the above
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calculations the granularity must: be scaled up by the compressed
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texel block dimensions.
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Queues supporting graphics and/or compute operations must: report
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latexmath:[$(1,1,1)$] in pname:minImageTransferGranularity, meaning that
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there are no additional restrictions on the granularity of image
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transfer operations for these queues. Other queues supporting image
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transfer operations are only required: to support whole mip level
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transfers, thus pname:minImageTransferGranularity for
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queues belonging to such queue families may: be latexmath:[$(0,0,0)$].
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include::../validity/structs/VkQueueFamilyProperties.txt[]
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See Also
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--------
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slink:VkExtent3D, elink:VkQueueFlags, flink:vkGetPhysicalDeviceQueueFamilyProperties
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Document Notes
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--------------
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For more information, see the Vulkan Specification at URL
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https://www.khronos.org/registry/vulkan/specs/1.0/xhtml/vkspec.html#VkQueueFamilyProperties
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This page is extracted from the Vulkan Specification.
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Fixes and changes should be made to the Specification,not directly.
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include::footer.txt[]
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