Deprecation state
-
Promoted to
VK_EXT_mutable_descriptor_type
extension
Contact
-
Joshua Ashton Joshua-Ashton
-
Hans-Kristian Arntzen HansKristian-Work
Other Extension Metadata
- Last Modified Date
-
2020-12-02
- IP Status
-
No known IP claims.
- Contributors
-
-
Joshua Ashton, Valve
-
Hans-Kristian Arntzen, Valve
-
Description
This extension allows applications to reduce descriptor memory footprint by allowing a descriptor to be able to mutate to a given list of descriptor types depending on which descriptor types are written into, or copied into a descriptor set.
The main use case this extension intends to address is descriptor indexing
with VK_DESCRIPTOR_BINDING_VARIABLE_DESCRIPTOR_COUNT_BIT
where the
descriptor types are completely generic, as this means applications can
allocate one large descriptor set, rather than having one large descriptor
set per descriptor type, which significantly bloats descriptor memory usage
and causes performance issues.
This extension also adds a mechanism to declare that a descriptor pool, and therefore the descriptor sets that are allocated from it, reside only in host memory; as such these descriptors can only be updated/copied, but not bound.
These features together allow much more efficient emulation of the raw D3D12 binding model. This extension is primarily intended to be useful for API layering efforts.
New Enum Constants
-
VK_VALVE_MUTABLE_DESCRIPTOR_TYPE_EXTENSION_NAME
-
VK_VALVE_MUTABLE_DESCRIPTOR_TYPE_SPEC_VERSION
-
Extending VkDescriptorPoolCreateFlagBits:
-
VK_DESCRIPTOR_POOL_CREATE_HOST_ONLY_BIT_VALVE
-
-
Extending VkDescriptorSetLayoutCreateFlagBits:
-
VK_DESCRIPTOR_SET_LAYOUT_CREATE_HOST_ONLY_POOL_BIT_VALVE
-
-
Extending VkDescriptorType:
-
VK_DESCRIPTOR_TYPE_MUTABLE_VALVE
-
-
Extending VkStructureType:
-
VK_STRUCTURE_TYPE_MUTABLE_DESCRIPTOR_TYPE_CREATE_INFO_VALVE
-
VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_MUTABLE_DESCRIPTOR_TYPE_FEATURES_VALVE
-
Version History
-
Revision 1, 2020-12-01 (Joshua Ashton, Hans-Kristian Arntzen)
-
Initial specification, squashed from public draft.
-
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.