# VkTimeDomainEXT(3) Manual Page

## Name

VkTimeDomainEXT - Supported time domains

## C Specification

The set of supported time domains consists of:

    typedef enum VkTimeDomainEXT {
        VK_TIME_DOMAIN_DEVICE_EXT = 0,
        VK_TIME_DOMAIN_CLOCK_MONOTONIC_EXT = 1,
        VK_TIME_DOMAIN_CLOCK_MONOTONIC_RAW_EXT = 2,
        VK_TIME_DOMAIN_QUERY_PERFORMANCE_COUNTER_EXT = 3,
        VK_TIME_DOMAIN_MAX_ENUM_EXT = 0x7FFFFFFF
    } VkTimeDomainEXT;

## Description

- `VK_TIME_DOMAIN_DEVICE_EXT` specifies the device time domain. Timestamp values in this time domain use the same units and are comparable with device timestamp values captured using vkCmdWriteTimestamp and are defined to be incrementing according to the timestampPeriod of the device.

- `VK_TIME_DOMAIN_CLOCK_MONOTONIC_EXT` specifies the CLOCK_MONOTONIC time domain available on POSIX platforms. Timestamp values in this time domain are in units of nanoseconds and are comparable with platform timestamp values captured using the POSIX clock_gettime API as computed by this example:

    struct timespec tv;
    clock_gettime(CLOCK_MONOTONIC, &tv);
    return tv.tv_nsec + tv.tv_sec*1000000000ull;

- `VK_TIME_DOMAIN_CLOCK_MONOTONIC_RAW_EXT` specifies the CLOCK_MONOTONIC_RAW time domain available on POSIX platforms. Timestamp values in this time domain are in units of nanoseconds and are comparable with platform timestamp values captured using the POSIX clock_gettime API as computed by this example:

    struct timespec tv;
    clock_gettime(CLOCK_MONOTONIC_RAW, &tv);
    return tv.tv_nsec + tv.tv_sec*1000000000ull;

- `VK_TIME_DOMAIN_QUERY_PERFORMANCE_COUNTER_EXT` specifies the performance counter (QPC) time domain available on Windows. Timestamp values in this time domain are in the same units as those provided by the Windows QueryPerformanceCounter API and are comparable with platform timestamp values captured using that API as computed by this example:

    LARGE_INTEGER counter;
    QueryPerformanceCounter(&counter);
    return counter.QuadPart;

## See Also

VkCalibratedTimestampInfoEXT, vkGetPhysicalDeviceCalibrateableTimeDomainsEXT

## Document Notes

For more information, see the Vulkan Specification

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

## Copyright

Copyright (c) 2014-2020 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.