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