API Interactions
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Interacts with VKSC_VERSION_1_0 == Contact
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Kai Zhang kazhang
Other Extension Metadata
- Last Modified Date
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2022-09-07
- Contributors
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Kai Zhang, NVIDIA
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Jeff Bolz, NVIDIA
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Jonathan McCaffrey, NVIDIA
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Daniel Koch, NVIDIA
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Description
An application using external memory may wish to synchronize access to that
memory using semaphores and fences.
This extension enables an application to import semaphore and import/export
fence payloads to and from NvSciSync objects.
To import a NvSciSyncObj to a VkSemaphore or VkFence,
applications need to:
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Create an unreconciled
NvSciSyncAttrListviaNvSciSyncAttrListCreate() -
Fill the private attribute list via vkGetPhysicalDeviceSciSyncAttributesNV()
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Fill the public attribute list via
NvSciSyncAttrListSetAttrs() -
Reconcile the
NvSciSyncAttrListviaNvSciSyncAttrListReconcile() -
Create a
NvSciSyncObjviaNvSciSyncObjAlloc() -
To import a
NvSciSyncObjto a VkSemaphore, create a VkSemaphoreSciSyncPoolNV for theNvSciSyncObjand then select the semaphore from VkSemaphoreSciSyncPoolNV by passing the VkSemaphoreSciSyncCreateInfoNV structure to vkCreateSemaphore -
To import a
NvSciSyncObjto a VkFence, pass the VkImportFenceSciSyncInfoNV structure to the vkImportFenceSciSyncObjNV command.
To import/export a NvSciSyncFence to a VkFence object, that
VkFence object must already have a NvSciSyncObj previously
imported.
This extension does not support exporting semaphores from NvSciSync
objects.
For details of the NvSciSync APIs and data structures, see the
NvStreams
Documentation.
New Enum Constants
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VK_NV_EXTERNAL_SCI_SYNC_2_EXTENSION_NAME -
VK_NV_EXTERNAL_SCI_SYNC_2_SPEC_VERSION -
Extending VkExternalFenceHandleTypeFlagBits:
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VK_EXTERNAL_FENCE_HANDLE_TYPE_SCI_SYNC_FENCE_BIT_NV -
VK_EXTERNAL_FENCE_HANDLE_TYPE_SCI_SYNC_OBJ_BIT_NV
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Extending VkObjectType:
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VK_OBJECT_TYPE_SEMAPHORE_SCI_SYNC_POOL_NV
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Extending VkStructureType:
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VK_STRUCTURE_TYPE_EXPORT_FENCE_SCI_SYNC_INFO_NV -
VK_STRUCTURE_TYPE_FENCE_GET_SCI_SYNC_INFO_NV -
VK_STRUCTURE_TYPE_IMPORT_FENCE_SCI_SYNC_INFO_NV -
VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_EXTERNAL_SCI_SYNC_2_FEATURES_NV -
VK_STRUCTURE_TYPE_SCI_SYNC_ATTRIBUTES_INFO_NV -
VK_STRUCTURE_TYPE_SEMAPHORE_SCI_SYNC_CREATE_INFO_NV -
VK_STRUCTURE_TYPE_SEMAPHORE_SCI_SYNC_POOL_CREATE_INFO_NV
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If Vulkan SC 1.0 is supported:
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Extending VkStructureType:
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VK_STRUCTURE_TYPE_DEVICE_SEMAPHORE_SCI_SYNC_POOL_RESERVATION_CREATE_INFO_NV
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Issues
1) Does this extension extend or replace VK_NV_external_sci_sync?
RESOLVED. Replaces - expect to deprecate it and eventually remove it.
2) What part of VK_NV_external_sci_sync is deprecated/removed in
this extension?
RESOLVED.
The commands to import and export semaphores from
VK_NV_external_sci_sync are removed and have been replaced with an
alternate mechanism to import semaphores.
Fence import and export functionality is unchanged.
In particular:
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Removed Commands:
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Removed Structures:
3) Application migration guide from VK_NV_external_sci_sync to
VK_NV_external_sci_sync2
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In
VK_NV_external_sci_sync, to import aNvSciSyncObjto VkSemaphore, applications need to:-
Create a VkSemaphore by command vkCreateSemaphore.
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Call vkImportSemaphoreSciSyncObjNV command to import the
NvSciSyncObjto VkSemaphore created. -
Call vkDestroySemaphore to destroy the VkSemaphore after all submitted batches that refer to it have completed execution.
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In order to migrate to
VK_NV_external_sci_sync2, applications need to:-
Chain VkDeviceSemaphoreSciSyncPoolReservationCreateInfoNV to VkDeviceObjectReservationCreateInfo and specify the
semaphoreSciSyncPoolRequestCountmaximum number of semaphore SciSync pools that will be used simultaneously. -
Import the a
NvSciSyncObjto a VkSemaphoreSciSyncPoolNV by command vkCreateSemaphoreSciSyncPoolNV. -
Select the VkSemaphore from VkSemaphoreSciSyncPoolNV by passing the VkSemaphoreSciSyncCreateInfoNV structure to vkCreateSemaphore.
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Can call vkDestroySemaphore to destroy the VkSemaphore immediately after all the batches that refer to it are submitted.
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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.