vkGetImageSubresourceLayout(3)
===============================

Name
----
vkGetImageSubresourceLayout - Retrieve information about an image subresource.

C Specification
---------------

include::../protos/vkGetImageSubresourceLayout.txt[]

Parameters
----------

pname:device::
    A handle to the device that owns the image.

pname:image::
    A handle to the image about which to retrieve information.

pname:pSubresource::
    A pointer to a structure describing the image subresource.

pname:pLayout::
    A pointer to a structure that will receive information about the image
    subresource.

Description
-----------

fname:vkGetImageSubresourceLayout returns information about the memory
layout of a image subresource of an image. pname:device is a handle to the
device that owns pname:image, which is the image about which to retrieve
information. A description of the image subresource is passsed to the
command through an instance of the slink:VkImageSubresource structure, the
address of which is passed in pname:pSubresource. The definition of
slink:VkImageSubresource is:

include::../structs/VkImageSubresource.txt[]

Within the pname:pSubresource structure, pname:aspectMask is a bitfield describing the aspect of the image and
is made up of a single member of the elink:VkImageAspectFlagBits enumeration, the definition of which is:

include::../enums/VkImageAspectFlagBits.txt[]

The ename:VK_IMAGE_ASPECT_COLOR_BIT aspect is valid only for image formats that are usable as color. The
ename:VK_IMAGE_ASPECT_DEPTH_BIT aspect is valid for formats containing depth information and the
ename:VK_IMAGE_ASPECT_STENCIL_BIT aspect is valid only for formats containing stencil information. Note
that some formats contain both depth and stencil information, and
in this case, pname:aspectMask is used to select which to query. It is not legal to include more than
one member of elink:VkImageAspectFlagBits in pname:aspectMask. Some formats also include metadata
which may be implementation dependent but is queryable by specifying ename:VK_IMAGE_ASPECT_METADATA_BIT.

For resources that have mipmaps or are multiple array layers, the pname:mipLevel and pname:arrayLayer members describe
the mipmap level and array layer, respectively. For resources that do not have mipmaps or are not layered,
pname:mipLevel and pname:arrayLayer, respectively, should be set to zero.

Information about the selected sub-resource is returned to the caller in the instance of the slink:VkSubresourceLayout
structure pointed to by pname:pLayout. The definition of slink:VkSubresourceLayout is:

include::../structs/VkSubresourceLayout.txt[]

The pname:offset member of the pname:pLayout structure is filled with the relative offset of the start of the sub-resource
from the start of the parent resource's memory binding. The pname:size member is the size of the sub-resource in
memory. The pname:rowPitch specifies the distance in memory of the start of each texel row of the sub-resource
from the start of the previous row. The pname:depthPitch specififes the distance in memory of the start of each
slice of the sub-resource relative to the start of the previous slice. For one-dimensional resources, pname:rowPitch
is zero, and for one- and two-dimensional resources, pname:depthPitch is zero. All four parameters are specified
in bytes.

include::../validity/protos/vkGetImageSubresourceLayout.txt[]

See Also
--------

flink:vkGetPhysicalDeviceImageFormatProperties

include::footer.txt[]