82 lines
2.2 KiB
Plaintext
82 lines
2.2 KiB
Plaintext
// Copyright (c) 2014-2019 Khronos Group. This work is licensed under a
|
|
// Creative Commons Attribution 4.0 International License; see
|
|
// http://creativecommons.org/licenses/by/4.0/
|
|
|
|
include::meta/VK_GOOGLE_display_timing.txt[]
|
|
|
|
*Last Modified Date*::
|
|
2017-02-14
|
|
*IP Status*::
|
|
No known IP claims.
|
|
*Contributors*::
|
|
- Ian Elliott, Google
|
|
- Jesse Hall, Google
|
|
|
|
This device extension allows an application that uses the
|
|
`<<VK_KHR_swapchain>>` extension to obtain information about the
|
|
presentation engine's display, to obtain timing information about each
|
|
present, and to schedule a present to happen no earlier than a desired time.
|
|
An application can use this to minimize various visual anomalies (e.g.
|
|
stuttering).
|
|
|
|
Traditional game and real-time animation applications need to correctly
|
|
position their geometry for when the presentable image will be presented to
|
|
the user.
|
|
To accomplish this, applications need various timing information about the
|
|
presentation engine's display.
|
|
They need to know when presentable images were actually presented, and when
|
|
they could have been presented.
|
|
Applications also need to tell the presentation engine to display an image
|
|
no sooner than a given time.
|
|
This allows the application to avoid stuttering, so the animation looks
|
|
smooth to the user.
|
|
|
|
This extension treats variable-refresh-rate (VRR) displays as if they are
|
|
fixed-refresh-rate (FRR) displays.
|
|
|
|
=== New Object Types
|
|
|
|
None.
|
|
|
|
=== New Enum Constants
|
|
|
|
* Extending elink:VkStructureType:
|
|
** ename:VK_STRUCTURE_TYPE_PRESENT_TIMES_INFO_GOOGLE
|
|
|
|
=== New Enums
|
|
|
|
None.
|
|
|
|
=== New Structures
|
|
|
|
* slink:VkRefreshCycleDurationGOOGLE
|
|
* slink:VkPastPresentationTimingGOOGLE
|
|
* slink:VkPresentTimesInfoGOOGLE
|
|
* slink:VkPresentTimeGOOGLE
|
|
|
|
=== New Functions
|
|
|
|
* flink:vkGetRefreshCycleDurationGOOGLE
|
|
* flink:vkGetPastPresentationTimingGOOGLE
|
|
|
|
=== Issues
|
|
|
|
None.
|
|
|
|
=== Examples
|
|
|
|
[NOTE]
|
|
.Note
|
|
====
|
|
The example code for the this extension (like the `<<VK_KHR_surface>>` and
|
|
`VK_GOOGLE_display_timing` extensions) is contained in the cube demo that is
|
|
shipped with the official Khronos SDK, and is being kept up-to-date in that
|
|
location (see:
|
|
https://github.com/KhronosGroup/Vulkan-Tools/blob/master/cube/cube.c ).
|
|
====
|
|
|
|
=== Version History
|
|
|
|
* Revision 1, 2017-02-14 (Ian Elliott)
|
|
- Internal revisions
|