100 lines
3.8 KiB
Plaintext
100 lines
3.8 KiB
Plaintext
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vkGetImageSparseMemoryRequirements(3)
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=====================================
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Name
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----
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vkGetImageSparseMemoryRequirements - Query the memory requirements for a sparse image.
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C Specification
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---------------
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include::../protos/vkGetImageSparseMemoryRequirements.txt[]
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Parameters
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----------
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pname:device::
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A handle to the device that owns the image being queried.
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pname:image::
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A handle to the image to be queried.
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pname:pSparseMemoryRequirementCount::
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On input, a pointer to a variable containing the number of elements in the array pointed to
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by pname:pSparseMemoryRequirements. On output, this variable is overwritten with the number
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of elements written into pname:pSparseMemoryRequirements.
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pname:pSparseMemoryRequirements::
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A pointer to an array of structures that will be filled with the requested information.
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Description
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-----------
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fname:vkGetImageSparseMemoryRequirements queries the device specified in pname:device for
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the memory requirements of the sparse image specified in pname:image, which must be a
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handle to a sparse image.
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pname:pSparseMemoryRequirementCount is a pointer to a variable which, on input to the
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command contains the number of elements in the array pointed to by
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pname:pSparseMemoryRequirements. This is an array of slink:VkSparseImageMemoryRequirements
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structures, the definition of which is:
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include::../structs/VkSparseImageMemoryRequirements.txt[]
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Within slink:VkSparseImageMemoryRequirements, the pname:formatProperties member is an
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instance of the slink:VkSparseImageFormatProperties structure, the definition of
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which is:
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include::../structs/VkSparseImageFormatProperties.txt[]
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The pname:aspectMask member of slink:VkSparseImageFormatProperties specifies the image
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aspect or aspects to which the remainder of the properties apply. This is a bitfield
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made up from members of the elink:VkImageAspectFlagBits enumeration, the definition
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of which is:
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include::../enums/VkImageAspectFlagBits.txt[]
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For each unique aspect of the image, an instance of slink:VkSparseImageFormatProperties is
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returned. The pname:imageGranularity member specifies the size, in texels, of the
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smallest region that may be uniquely bound within the image specified by pname:image.
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Binding is affected by calling flink:vkQueueBindSparse.
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It is an instance of the slink:VkExtent3D structure which contains the size of the
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sparse binding regions, expressed in texels.
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The pname:flags member is a bitfield made up from members of the elink:VkSparseImageFormatFlagBits
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enumeration and describes additional requirements for sparse memory binding. The
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definition of which is:
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include::../enums/VkSparseImageFormatFlagBits.txt[]
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The meanings of each of the flags is as follows:
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If ename:VK_SPARSE_IMAGE_FORMAT_SINGLE_MIPTAIL_BIT is set, the image combines mulitple levels
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at the tail of the mip chain into a single residency state for array textures. Otherwise,
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mip tail is individually addressable for each array layer.
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If ename:VK_SPARSE_IMAGE_FORMAT_ALIGNED_MIP_SIZE_BIT is set, then each mip level outside the
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tail is an exact multiple of the block size.
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If ename:VK_SPARSE_IMAGE_FORMAT_NONSTD_BLOCK_SIZE_BIT is set, then the format has a non-standard
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block size and the members of the pname:imageGranularity do not match the standard block
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size for the format.
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The pname:imageMipTailStartLod member of the slink:VkSparseImageMemoryRequirements structure
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contains the level-of-detail at which the mip tail begins for the image specified in
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pname:image.
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pname:imageMipTailSize contains the size of the mip tail, pname:imageMipTailOffset
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contains its offset, and pname:imageMipTailStride contains the stride between layers in the
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tail for array textures. All three members are expressed in bytes.
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include::../validity/protos/vkGetImageSparseMemoryRequirements.txt[]
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See Also
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--------
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flink:vkQueueBindSparse, flink:vkGetImageMemoryRequirements
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include::footer.txt[]
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