# VkPerformanceCounterDescriptionFlagBitsKHR(3) Manual Page

## Name

VkPerformanceCounterDescriptionFlagBitsKHR - Bitmask specifying usage behavior for a counter

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## C Specification

Bits which can be set in VkPerformanceCounterDescriptionKHR::`flags`, specifying usage behavior of a performance counter, are:

    // Provided by VK_KHR_performance_query
    typedef enum VkPerformanceCounterDescriptionFlagBitsKHR {
        VK_PERFORMANCE_COUNTER_DESCRIPTION_PERFORMANCE_IMPACTING_BIT_KHR = 0x00000001,
        VK_PERFORMANCE_COUNTER_DESCRIPTION_CONCURRENTLY_IMPACTED_BIT_KHR = 0x00000002,
      // VK_PERFORMANCE_COUNTER_DESCRIPTION_PERFORMANCE_IMPACTING_KHR is a deprecated alias
        VK_PERFORMANCE_COUNTER_DESCRIPTION_PERFORMANCE_IMPACTING_KHR = VK_PERFORMANCE_COUNTER_DESCRIPTION_PERFORMANCE_IMPACTING_BIT_KHR,
      // VK_PERFORMANCE_COUNTER_DESCRIPTION_CONCURRENTLY_IMPACTED_KHR is a deprecated alias
        VK_PERFORMANCE_COUNTER_DESCRIPTION_CONCURRENTLY_IMPACTED_KHR = VK_PERFORMANCE_COUNTER_DESCRIPTION_CONCURRENTLY_IMPACTED_BIT_KHR,
    } VkPerformanceCounterDescriptionFlagBitsKHR;

## Description

- `VK_PERFORMANCE_COUNTER_DESCRIPTION_PERFORMANCE_IMPACTING_BIT_KHR` specifies that recording the counter may have a noticeable performance impact.

- `VK_PERFORMANCE_COUNTER_DESCRIPTION_CONCURRENTLY_IMPACTED_BIT_KHR` specifies that concurrently recording the counter while other submitted command buffers are running may impact the accuracy of the recording.

## See Also

VK_KHR_performance_query, VkPerformanceCounterDescriptionFlagsKHR

## 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 2014-2025 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0