68 lines
2.9 KiB
Plaintext
68 lines
2.9 KiB
Plaintext
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[open,refpage='VkPresentTimesInfoGOOGLE',desc='The earliest time each image should be presented',type='structs']
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--
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When the `<<VK_GOOGLE_display_timing>>` extension is enabled, additional
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fields can: be specified that allow an application to specify the earliest
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time that an image should be displayed.
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This allows an application to avoid stutter that is caused by an image being
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displayed earlier than planned.
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Such stuttering can occur with both fixed and variable-refresh-rate
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displays, because stuttering occurs when the geometry is not correctly
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positioned for when the image is displayed.
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An application can: instruct the presentation engine that an image should
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not be displayed earlier than a specified time by including the
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sname:VkPresentTimesInfoGOOGLE structure in the pname:pNext chain of the
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sname:VkPresentInfoKHR structure.
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The sname:VkPresentTimesInfoGOOGLE structure is defined as:
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include::{generated}/api/structs/VkPresentTimesInfoGOOGLE.txt[]
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* pname:sType is the type of this structure.
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* pname:pNext is `NULL` or a pointer to an extension-specific structure.
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* pname:swapchainCount is the number of swapchains being presented to by
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this command.
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* pname:pTimes is `NULL` or a pointer to an array of
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sname:VkPresentTimeGOOGLE elements with pname:swapchainCount entries.
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If not `NULL`, each element of pname:pTimes contains the earliest time
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to present the image corresponding to the entry in the
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sname:VkPresentInfoKHR::pname:pImageIndices array.
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.Valid Usage
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****
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* [[VUID-VkPresentTimesInfoGOOGLE-swapchainCount-01247]]
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pname:swapchainCount must: be the same value as
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sname:VkPresentInfoKHR::pname:swapchainCount, where
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sname:VkPresentInfoKHR is in the pname:pNext chain of this
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sname:VkPresentTimesInfoGOOGLE structure.
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****
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include::{generated}/validity/structs/VkPresentTimesInfoGOOGLE.txt[]
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--
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[open,refpage='VkPresentTimeGOOGLE',desc='The earliest time image should be presented',type='structs']
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--
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The sname:VkPresentTimeGOOGLE structure is defined as:
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include::{generated}/api/structs/VkPresentTimeGOOGLE.txt[]
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* pname:presentID is an application-provided identification value, that
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can: be used with the results of
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flink:vkGetPastPresentationTimingGOOGLE, in order to uniquely identify
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this present.
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In order to be useful to the application, it should: be unique within
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some period of time that is meaningful to the application.
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* pname:desiredPresentTime specifies that the image given should: not be
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displayed to the user any earlier than this time.
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pname:desiredPresentTime is a time in nanoseconds, relative to a
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monotonically-increasing clock (e.g. `CLOCK_MONOTONIC` (see
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clock_gettime(2)) on Android and Linux).
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A value of zero specifies that the presentation engine may: display the
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image at any time.
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This is useful when the application desires to provide pname:presentID,
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but does not need a specific pname:desiredPresentTime.
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--
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