C Specification
The VkImageViewCreateInfo structure is defined as:
// Provided by VK_VERSION_1_0
typedef struct VkImageViewCreateInfo {
VkStructureType sType;
const void* pNext;
VkImageViewCreateFlags flags;
VkImage image;
VkImageViewType viewType;
VkFormat format;
VkComponentMapping components;
VkImageSubresourceRange subresourceRange;
} VkImageViewCreateInfo;Members
-
sTypeis a VkStructureType value identifying this structure. -
pNextisNULLor a pointer to a structure extending this structure. -
flagsis a bitmask of VkImageViewCreateFlagBits specifying additional parameters of the image view. -
imageis a VkImage on which the view will be created. -
viewTypeis a VkImageViewType value specifying the type of the image view. -
formatis a VkFormat specifying the format and type used to interpret texel blocks of the image. -
componentsis a VkComponentMapping structure specifying a remapping of color components (or of depth or stencil components after they have been converted into color components). -
subresourceRangeis a VkImageSubresourceRange structure selecting the set of mipmap levels and array layers to be accessible to the view.
Description
Some of the image creation parameters are inherited by the view.
In particular, image view creation inherits the implicit parameter
usage specifying the allowed usages of the image view that, by
default, takes the value of the corresponding usage parameter
specified in VkImageCreateInfo at image creation time.
The implicit usage can be overridden by adding a
VkImageViewUsageCreateInfo structure to the pNext chain, but the
view usage must be a subset of the image usage.
If image has a depth-stencil format and was created with a
VkImageStencilUsageCreateInfo structure included in the pNext
chain of VkImageCreateInfo, the usage is calculated based on the
subresource.aspectMask provided:
-
If
aspectMaskincludes onlyVK_IMAGE_ASPECT_STENCIL_BIT, the implicitusageis equal to VkImageStencilUsageCreateInfo::stencilUsage. -
If
aspectMaskincludes onlyVK_IMAGE_ASPECT_DEPTH_BIT, the implicitusageis equal to VkImageCreateInfo::usage. -
If both aspects are included in
aspectMask, the implicitusageis equal to the intersection of VkImageCreateInfo::usageand VkImageStencilUsageCreateInfo::stencilUsage.
If image is a 3D image, its Z range can be restricted to a subset by
adding a VkImageViewSlicedCreateInfoEXT to the pNext chain.
If image was created with the VK_IMAGE_CREATE_MUTABLE_FORMAT_BIT
flag,
and if the format of the image is not
multi-planar,
format can be different from the image’s format, but if
image was created without the
VK_IMAGE_CREATE_BLOCK_TEXEL_VIEW_COMPATIBLE_BIT flag and
they are not equal they must be compatible.
Image format compatibility is defined in the
Format Compatibility Classes section.
Views of compatible formats will have the same mapping between texel
coordinates and memory locations irrespective of the format, with only
the interpretation of the bit pattern changing.
If image was created with a
multi-planar format, and the
image view’s aspectMask is one of VK_IMAGE_ASPECT_PLANE_0_BIT,
VK_IMAGE_ASPECT_PLANE_1_BIT or VK_IMAGE_ASPECT_PLANE_2_BIT, the
view’s aspect mask is considered to be equivalent to
VK_IMAGE_ASPECT_COLOR_BIT when used as a framebuffer attachment.
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Note
Values intended to be used with one view format may not be exactly preserved when written or read through a different format. For example, an integer value that happens to have the bit pattern of a floating point denorm or NaN may be flushed or canonicalized when written or read through a view with a floating point format. Similarly, a value written through a signed normalized format that has a bit pattern exactly equal to -2b may be changed to -2b + 1 as described in Conversion from Normalized Fixed-Point to Floating-Point. |
If image was created with the
VK_IMAGE_CREATE_BLOCK_TEXEL_VIEW_COMPATIBLE_BIT flag, format
must be compatible with the image’s format as described above; or must
be an uncompressed format, in which case it must be
size-compatible with the image’s format.
In this case, the resulting image view’s texel dimensions equal the
dimensions of the selected mip level divided by the compressed texel block
size and rounded up.
The VkComponentMapping components member describes a remapping
from components of the image to components of the vector returned by shader
image instructions.
This remapping must be the identity swizzle for storage image descriptors,
input attachment descriptors,
framebuffer attachments, and any VkImageView used with a combined
image sampler that enables sampler Y′CBCR
conversion.
If the image view is to be used with a sampler which supports
sampler Y′CBCR conversion, an identically
defined object of type VkSamplerYcbcrConversion to that used to
create the sampler must be passed to vkCreateImageView in a
VkSamplerYcbcrConversionInfo included in the pNext chain of
VkImageViewCreateInfo.
Conversely, if a VkSamplerYcbcrConversion object is passed to
vkCreateImageView, an identically defined
VkSamplerYcbcrConversion object must be used when sampling the image.
If the image has a
multi-planar format,
subresourceRange.aspectMask is VK_IMAGE_ASPECT_COLOR_BIT, and
usage includes VK_IMAGE_USAGE_SAMPLED_BIT, then the format
must be identical to the image format and the sampler to be used with
the image view must enable sampler Y′CBCR
conversion.
When such an image is used in a video coding operation, the sampler Y′CBCR conversion has no effect.
If image was created with the VK_IMAGE_CREATE_MUTABLE_FORMAT_BIT
and the image has a
multi-planar format,
and if subresourceRange.aspectMask is
VK_IMAGE_ASPECT_PLANE_0_BIT, VK_IMAGE_ASPECT_PLANE_1_BIT, or
VK_IMAGE_ASPECT_PLANE_2_BIT, format must be
compatible with the corresponding plane of the
image, and the sampler to be used with the image view must not enable
sampler Y′CBCR conversion.
The width and height of the single-plane image view must be
derived from the multi-planar image’s dimensions in the manner listed for
plane compatibility for the plane.
Any view of an image plane will have the same mapping between texel coordinates and memory locations as used by the components of the color aspect, subject to the formulae relating texel coordinates to lower-resolution planes as described in Chroma Reconstruction. That is, if an R or B plane has a reduced resolution relative to the G plane of the multi-planar image, the image view operates using the (uplane, vplane) unnormalized coordinates of the reduced-resolution plane, and these coordinates access the same memory locations as the (ucolor, vcolor) unnormalized coordinates of the color aspect for which chroma reconstruction operations operate on the same (uplane, vplane) or (iplane, jplane) coordinates.
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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.