95 lines
2.5 KiB
Plaintext
95 lines
2.5 KiB
Plaintext
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// Copyright (c) 2014-2016 The Khronos Group Inc.
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// Copyright notice at https://www.khronos.org/registry/speccopyright.html
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[[VK_GOOGLE_display_timing]]
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== VK_GOOGLE_display_timing
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*Name String*::
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+VK_GOOGLE_display_timing+
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*Extension Type*::
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Device extension
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*Registered Extension Number*::
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93
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*Last Modified Date*::
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2017-02-14
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*Revision*::
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1
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*IP Status*::
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No known IP claims.
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*Dependencies*::
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- This extension is written against version 1.0 of the Vulkan API.
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- This extension requires +VK_KHR_swapchain+.
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*Contributors*::
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- Ian Elliott, Google
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- Jesse Hall, Google
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*Contacts*::
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- Ian Elliott, Google
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This device extension allows an application that uses the +VK_KHR_swapchain+
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extension to obtain information about the presentation engine's display, to
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obtain timing information about each present, and to schedule a present to
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happen no earlier than a desired time.
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An application can use this to minimize various visual anomalies (e.g.
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stuttering).
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Traditional game and real-time animation applications need to correctly
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position their geometry for when the presentable image will be presented to
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the user.
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To accomplish this, applications need various timing information about the
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presentation engine's display.
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They need to know when presentable images were actually presented, and when
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they could have been presented.
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Applications also need to tell the presentation engine to display an image
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no sooner than a given time.
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This can allow the application's animation to look smooth to the user, with
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no stuttering.
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This extension treats variable-refresh-rate (VRR) displays as if they are
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fixed-refresh-rate (FRR) displays.
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=== New Object Types
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None.
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=== New Enum Constants
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* Extending ename:VkStructureType:
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** ename:VK_STRUCTURE_TYPE_PRESENT_TIMES_INFO_GOOGLE
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=== New Enums
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None.
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=== New Structures
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* slink:VkRefreshCycleDurationGOOGLE
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* slink:VkPastPresentationTimingGOOGLE
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* slink:VkPresentTimesInfoGOOGLE
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* slink:VkPresentTimeGOOGLE
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=== New Functions
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* flink:vkGetRefreshCycleDurationGOOGLE
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* flink:vkGetPastPresentationTimingGOOGLE
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=== Issues
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None.
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=== Examples
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[NOTE]
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.Note
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====
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The example code for the this extension (like the +VK_KHR_surface+ and
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+VK_GOOGLE_display_timing+ extensions) is contained in the cube demo that is
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shipped with the official Khronos SDK, and is being kept up-to-date in that
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location (see:
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https://github.com/KhronosGroup/Vulkan-LoaderAndValidationLayers/blob/master/demos/cube.c).
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====
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=== Version History
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* Revision 1, 2017-02-14 (Ian Elliott)
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- Internal revisions
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