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Modulevulkan-3.27GHC2021

Vulkan.Extensions.VK_MESA_image_alignment_control

Name

VK_MESA_image_alignment_control - device extension

VK_MESA_image_alignment_control

Name String

VK_MESA_image_alignment_control

Extension Type

Device extension

Registered Extension Number

576

Revision

1

Ratification Status

Not ratified

Extension and Version Dependencies

VK_KHR_get_physical_device_properties2

or

Vulkan Version 1.1

Special Use
Contact

Other Extension Metadata

Last Modified Date

2024-05-03

IP Status

No known IP claims.

Contributors

  • Hans-Kristian Arntzen, Valve

Description

This extension allows applications to request a narrower alignment for images than an implementation would otherwise require. Some implementations internally support multiple image layouts in IMAGE_TILING_OPTIMAL, each with different alignment requirements and performance trade-offs. In some API layering use cases such as D3D12, it is beneficial to be able to control the alignment, since certain alignments for placed resources are guaranteed to be supported, and emulating that expectation requires unnecessary padding of allocations.

ImageAlignmentControlCreateInfoMESA can be chained to ImageCreateInfo, requesting that the alignment is no more than the provided alignment. If the requested alignment is not supported for a given ImageCreateInfo, a larger alignment may be returned.

While something similar could be achieved with VK_EXT_image_drm_format_modifier in theory, this is not the intended way to use that extension. Format modifiers are generally used for externally shareable images, and would not be platform portable. It is also a cumbersome API to use just to lower the alignment.

New Structures

New Enum Constants

Version History

  • Revision 1, 2024-04-05 (Hans-Kristian Arntzen)

    • Initial specification

See Also

No cross-references are available

Document Notes

For more information, see the Vulkan Specification.

This page is a generated document. Fixes and changes should be made to the generator scripts, not directly.

  • 5 types
  • Packagevulkan-3.27
  • Exports7
  • LanguageGHC2021
  • LicenceBSD-3-Clause
  • SourceVK_MESA_image_alignment_control.hs
datadata PhysicalDeviceImageAlignmentControlFeaturesMESA
#

VkPhysicalDeviceImageAlignmentControlFeaturesMESA - Structure describing features supported by VK_MESA_image_alignment_control

Members

This structure describes the following feature:

Description

If the PhysicalDeviceImageAlignmentControlFeaturesMESA structure is included in the pNext chain of the PhysicalDeviceFeatures2 structure passed to getPhysicalDeviceFeatures2, it is filled in to indicate whether each corresponding feature is supported. If the application wishes to use a Device with any features described by PhysicalDeviceImageAlignmentControlFeaturesMESA, it must add an instance of the structure, with the desired feature members set to TRUE, to the pNext chain of DeviceCreateInfo when creating the Device.

Structure Chaining

Extends the structures

See Also

VK_MESA_image_alignment_control, Bool32, StructureType

Constructors

Instances6Eq, Show, Storable, FromCStruct, ToCStruct, Zero
datadata PhysicalDeviceImageAlignmentControlPropertiesMESA
#

VkPhysicalDeviceImageAlignmentControlPropertiesMESA - Structure describing supported image alignments for a physical device

Members

The members of the PhysicalDeviceImageAlignmentControlPropertiesMESA structure describe the following:

Description

If the PhysicalDeviceImageAlignmentControlPropertiesMESA structure is included in the pNext chain of the PhysicalDeviceProperties2 structure passed to getPhysicalDeviceProperties2, it is filled in with each corresponding implementation-dependent property.

Structure Chaining

Extends the structure

See Also

VK_MESA_image_alignment_control, StructureType

Constructors

Instances6Eq, Show, Storable, FromCStruct, ToCStruct, Zero
datadata ImageAlignmentControlCreateInfoMESA
#

VkImageAlignmentControlCreateInfoMESA - Specify image alignment

Description

If maximumRequestedAlignment is not 0, the implementation should choose an image memory layout that requires an alignment no larger than maximumRequestedAlignment as reported in MemoryRequirements::alignment. If such a layout does not exist for the given image creation parameters, the implementation should return the smallest alignment which is supported in MemoryRequirements.

If an implementation needs to disable image compression for maximumRequestedAlignment to be honored - where a larger alignment would enable image compression - the implementation should not use maximumRequestedAlignment, and should return the smallest alignment which does not compromise compression. If the imageCompressionControl feature is enabled, the application can chain a ImageCompressionControlEXT with IMAGE_COMPRESSION_DISABLED_EXT. In this case, image compression considerations should not apply when implementation decides alignment.

Valid Usage

  • If maximumRequestedAlignment is not 0, maximumRequestedAlignment must be a power of two

Valid Usage (Implicit)

Structure Chaining

Extends the structure

See Also

VK_MESA_image_alignment_control, StructureType

Constructors

Instances6Eq, Show, Storable, FromCStruct, ToCStruct, Zero