VK_KHR_maintenance9

Other Extension Metadata

Last Modified Date

2025-05-29

Interactions and External Dependencies###### Contributors

• Mike Blumenkrantz, Valve
• Shahbaz Youssefi, Google
• Hans-Kristian Arntzen, Valve
• Piers Daniell, NVIDIA
• Daniel Story, Nintendo
• Jeff Bolz, NVIDIA

Description

VK_KHR_maintenance9 adds a collection of minor features, none of which would warrant an entire extension of their own.

The new features are as follows:

• Support VkDevice with no queues. These can be used as effectively an offline compiler to prepopulate pipeline caches, without expensive queue creation or internal memory allocations.
• Allow vkCmdSetEvent2 to not provide a dependency, providing vkCmdSetEvent-style usage using enums from VK_KHR_synchronization2
• Add a VkQueryPoolCreateFlagBits::VK_QUERY_POOL_CREATE_RESET_BIT_KHR flag to create a query pool with all queries initialized to the reset state.
• Allow any integer bit width for specific bit-wise operations.
• Add a property to enable sparse support with VK_EXT_image_2d_view_of_3d.
• Add a property to indicate the implementation will return (0,0,0,0) or (0,0,0,1) to vertex shaders that read unassigned attributes.
• The effects of image memory barriers and image layout transitions on 3D images created with VK_IMAGE_CREATE_2D_ARRAY_COMPATIBLE_BIT are scoped to the slices specified by the user-provided VkImageSubresourceRange.
• Queue family ownership transfers are no longer required for buffers and linear images, and a new physical device queue family property is exposed to indicate whether queue family ownership transfers are required for optimal images.

New Structures

• Extending VkPhysicalDeviceFeatures2, VkDeviceCreateInfo:
  • VkPhysicalDeviceMaintenance9FeaturesKHR
• Extending VkPhysicalDeviceProperties2:
  • VkPhysicalDeviceMaintenance9PropertiesKHR
• Extending VkQueueFamilyProperties2:
  • VkQueueFamilyOwnershipTransferPropertiesKHR

New Enums

• VkDefaultVertexAttributeValueKHR

New Enum Constants

• VK_KHR_MAINTENANCE_9_EXTENSION_NAME
• VK_KHR_MAINTENANCE_9_SPEC_VERSION
• Extending VkDependencyFlagBits:
  • VK_DEPENDENCY_ASYMMETRIC_EVENT_BIT_KHR
• Extending VkQueryPoolCreateFlagBits:
  • VK_QUERY_POOL_CREATE_RESET_BIT_KHR
• Extending VkStructureType:
  • VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_MAINTENANCE_9_FEATURES_KHR
  • VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_MAINTENANCE_9_PROPERTIES_KHR
  • VK_STRUCTURE_TYPE_QUEUE_FAMILY_OWNERSHIP_TRANSFER_PROPERTIES_KHR

Issues

None.

Version History

• Revision 1, 2025-05-29 (Contributors)
  • Internal revisions