Contact
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James Jones cubanismo
Other Extension Metadata
- Last Modified Date
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2016-10-21
- IP Status
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No known IP claims.
- Contributors
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James Jones, NVIDIA
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Jeff Juliano, NVIDIA
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Carsten Rohde, NVIDIA
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Description
An application may wish to reference device memory in multiple Vulkan logical devices or instances, in multiple processes, and/or in multiple APIs. This extension enables an application to export Windows handles from Vulkan memory objects and to import Vulkan memory objects from Windows handles exported from other Vulkan memory objects or from similar resources in other APIs.
New Enum Constants
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VK_KHR_EXTERNAL_MEMORY_WIN32_EXTENSION_NAME -
VK_KHR_EXTERNAL_MEMORY_WIN32_SPEC_VERSION -
Extending VkStructureType:
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VK_STRUCTURE_TYPE_EXPORT_MEMORY_WIN32_HANDLE_INFO_KHR -
VK_STRUCTURE_TYPE_IMPORT_MEMORY_WIN32_HANDLE_INFO_KHR -
VK_STRUCTURE_TYPE_MEMORY_GET_WIN32_HANDLE_INFO_KHR -
VK_STRUCTURE_TYPE_MEMORY_WIN32_HANDLE_PROPERTIES_KHR
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Issues
1) Do applications need to call CloseHandle() on the values returned
from vkGetMemoryWin32HandleKHR when handleType is
VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_WIN32_BIT_KHR?
RESOLVED: Yes, unless it is passed back in to another driver instance to import the object. A successful get call transfers ownership of the handle to the application. Destroying the memory object will not destroy the handle or the handle’s reference to the underlying memory resource.
2) Should the language regarding KMT/Windows 7 handles be moved to a separate extension so that it can be deprecated over time?
RESOLVED: No. Support for them can be deprecated by drivers if they choose, by no longer returning them in the supported handle types of the instance level queries.
3) How should the valid size and memory type for windows memory handles created outside of Vulkan be specified?
RESOLVED: The valid memory types are queried directly from the external handle. The size is determined by the associated image or buffer memory requirements for external handle types that require dedicated allocations, and by the size specified when creating the object from which the handle was exported for other external handle types.
Document Notes
For more information, see the Vulkan Specification
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