83 lines
2.4 KiB
Plaintext
83 lines
2.4 KiB
Plaintext
// Copyright (c) 2014-2016 Khronos Group. This work is licensed under a
|
|
// Creative Commons Attribution 4.0 International License; see
|
|
// http://creativecommons.org/licenses/by/4.0/
|
|
|
|
vkCmdWriteTimestamp(3)
|
|
======================
|
|
|
|
Name
|
|
----
|
|
vkCmdWriteTimestamp - Write a device timestamp into a query object.
|
|
|
|
C Specification
|
|
---------------
|
|
|
|
// refBegin vkCmdWriteTimestamp Write a device timestamp into a query object.
|
|
|
|
To request a timestamp, call:
|
|
|
|
include::../api/protos/vkCmdWriteTimestamp.txt[]
|
|
|
|
|
|
Parameters
|
|
----------
|
|
|
|
* pname:commandBuffer is the command buffer into which the command will be
|
|
recorded.
|
|
* pname:pipelineStage is one of the elink:VkPipelineStageFlagBits,
|
|
specifying a stage of the pipeline.
|
|
* pname:queryPool is the query pool that will manage the timestamp.
|
|
* pname:query is the query within the query pool that will contain the
|
|
timestamp.
|
|
|
|
|
|
Description
|
|
-----------
|
|
|
|
fname:vkCmdWriteTimestamp latches the value of the timer when all previous
|
|
commands have completed executing as far as the specified pipeline stage,
|
|
and writes the timestamp value to memory. When the timestamp value is
|
|
written, the availability status of the query is set to available.
|
|
|
|
[NOTE]
|
|
.Note
|
|
====
|
|
If an implementation is unable to detect completion and latch the timer at
|
|
any specific stage of the pipeline, it may: instead do so at any logically
|
|
later stage.
|
|
====
|
|
|
|
flink:vkCmdCopyQueryPoolResults can: then be called to copy the timestamp
|
|
value from the query pool into buffer memory, with ordering and
|
|
synchronization behavior equivalent to how other queries operate. Timestamp
|
|
values can: also be retrieved from the query pool using
|
|
flink:vkGetQueryPoolResults. As with other queries, the query must: be reset
|
|
using flink:vkCmdResetQueryPool before requesting the timestamp value be
|
|
written to it.
|
|
|
|
While fname:vkCmdWriteTimestamp can: be called inside or outside of a render
|
|
pass instance, flink:vkCmdCopyQueryPoolResults must: only be called outside
|
|
of a render pass instance.
|
|
|
|
include::../validity/protos/vkCmdWriteTimestamp.txt[]
|
|
|
|
|
|
See Also
|
|
--------
|
|
|
|
slink:VkCommandBuffer, elink:VkPipelineStageFlagBits, slink:VkQueryPool
|
|
|
|
|
|
Document Notes
|
|
--------------
|
|
|
|
For more information, see the Vulkan Specification at URL
|
|
|
|
https://www.khronos.org/registry/vulkan/specs/1.0/xhtml/vkspec.html#vkCmdWriteTimestamp
|
|
|
|
This page is extracted from the Vulkan Specification.
|
|
Fixes and changes should be made to the Specification,not directly.
|
|
|
|
include::footer.txt[]
|
|
|