# Vulkan® 1.4.303 - A Specification (with all registered extensions)

The Khronos® Vulkan Working Group
version 1.4.303, 2024-12-15 00:58:43Z
from git branch: Git branch not available commit: Git commit not available

Loading… please wait.

Search:

## 18. Queries

Queries provide a mechanism to return information about the processing of a sequence of Vulkan commands. Query operations are asynchronous, and as such, their results are not returned immediately. Instead, their results, and their availability status are stored in a Query Pool. The state of these queries can be read back on the host, or copied to a buffer object on the device.

The supported query types are Occlusion Queries, Pipeline Statistics Queries, Result Status Queries, Video Encode Feedback Queries and Timestamp Queries. Performance Queries are supported if the associated extension is available. Transform Feedback Queries are supported if the associated extension is available. Intel Performance Queries are supported if the associated extension is available. Mesh Shader Queries are supported if the associated extension is available.

Several additional queries with specific purposes associated with ray tracing are available if the corresponding extensions are supported, as described for VkQueryType.

### 18.1. Query Pools

Queries are managed using query pool objects. Each query pool is a collection of a specific number of queries of a particular type.

Query pools are represented by `VkQueryPool` handles:

    // Provided by VK_VERSION_1_0
    VK_DEFINE_NON_DISPATCHABLE_HANDLE(VkQueryPool)

To create a query pool, call:

    // Provided by VK_VERSION_1_0
    VkResult vkCreateQueryPool(
        VkDevice                                    device,
        const VkQueryPoolCreateInfo*                pCreateInfo,
        const VkAllocationCallbacks*                pAllocator,
        VkQueryPool*                                pQueryPool);

- `device` is the logical device that creates the query pool.

- `pCreateInfo` is a pointer to a VkQueryPoolCreateInfo structure containing the number and type of queries to be managed by the pool.

- `pAllocator` controls host memory allocation as described in the Memory Allocation chapter.

- `pQueryPool` is a pointer to a VkQueryPool handle in which the resulting query pool object is returned.

Valid Usage

- VUID-vkCreateQueryPool-device-09663
  `device` must support at least one queue family with one of the `VK_QUEUE_VIDEO_ENCODE_BIT_KHR`, `VK_QUEUE_VIDEO_DECODE_BIT_KHR`, `VK_QUEUE_COMPUTE_BIT`, or `VK_QUEUE_GRAPHICS_BIT` capabilities

Valid Usage (Implicit)

- VUID-vkCreateQueryPool-device-parameter
  `device` must be a valid VkDevice handle

- VUID-vkCreateQueryPool-pCreateInfo-parameter
  `pCreateInfo` must be a valid pointer to a valid VkQueryPoolCreateInfo structure

- VUID-vkCreateQueryPool-pAllocator-parameter
  If `pAllocator` is not `NULL`, `pAllocator` must be a valid pointer to a valid VkAllocationCallbacks structure

- VUID-vkCreateQueryPool-pQueryPool-parameter
  `pQueryPool` must be a valid pointer to a VkQueryPool handle

Return Codes

Success

  - `VK_SUCCESS`

Failure

  - `VK_ERROR_OUT_OF_HOST_MEMORY`

  - `VK_ERROR_OUT_OF_DEVICE_MEMORY`

The `VkQueryPoolCreateInfo` structure is defined as:

    // Provided by VK_VERSION_1_0
    typedef struct VkQueryPoolCreateInfo {
        VkStructureType                  sType;
        const void*                      pNext;
        VkQueryPoolCreateFlags           flags;
        VkQueryType                      queryType;
        uint32_t                         queryCount;
        VkQueryPipelineStatisticFlags    pipelineStatistics;
    } VkQueryPoolCreateInfo;

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `flags` is reserved for future use.

- `queryType` is a VkQueryType value specifying the type of queries managed by the pool.

- `queryCount` is the number of queries managed by the pool.

- `pipelineStatistics` is a bitmask of VkQueryPipelineStatisticFlagBits specifying which counters will be returned in queries on the new pool, as described below in Pipeline Statistics Queries.

`pipelineStatistics` is ignored if `queryType` is not `VK_QUERY_TYPE_PIPELINE_STATISTICS`.

Valid Usage

- VUID-VkQueryPoolCreateInfo-queryType-00791
  If the `pipelineStatisticsQuery` feature is not enabled, `queryType` must not be `VK_QUERY_TYPE_PIPELINE_STATISTICS`

- VUID-VkQueryPoolCreateInfo-meshShaderQueries-07068
  If the `meshShaderQueries` feature is not enabled, `queryType` must not be `VK_QUERY_TYPE_MESH_PRIMITIVES_GENERATED_EXT`

- VUID-VkQueryPoolCreateInfo-meshShaderQueries-07069
  If the `meshShaderQueries` feature is not enabled, and `queryType` is `VK_QUERY_TYPE_PIPELINE_STATISTICS`, `pipelineStatistics` must not contain `VK_QUERY_PIPELINE_STATISTIC_TASK_SHADER_INVOCATIONS_BIT_EXT` or `VK_QUERY_PIPELINE_STATISTIC_MESH_SHADER_INVOCATIONS_BIT_EXT`

- VUID-VkQueryPoolCreateInfo-queryType-00792
  If `queryType` is `VK_QUERY_TYPE_PIPELINE_STATISTICS`, `pipelineStatistics` must be a valid combination of VkQueryPipelineStatisticFlagBits values

- VUID-VkQueryPoolCreateInfo-queryType-09534
  If `queryType` is `VK_QUERY_TYPE_PIPELINE_STATISTICS`, `pipelineStatistics` must not be zero

- VUID-VkQueryPoolCreateInfo-queryType-03222
  If `queryType` is `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR`, the `pNext` chain must include a VkQueryPoolPerformanceCreateInfoKHR structure

- VUID-VkQueryPoolCreateInfo-queryCount-02763
  `queryCount` must be greater than 0

- VUID-VkQueryPoolCreateInfo-queryType-07133
  If `queryType` is `VK_QUERY_TYPE_VIDEO_ENCODE_FEEDBACK_KHR`, then the `pNext` chain must include a VkVideoProfileInfoKHR structure with `videoCodecOperation` specifying an encode operation

- VUID-VkQueryPoolCreateInfo-queryType-07906
  If `queryType` is `VK_QUERY_TYPE_VIDEO_ENCODE_FEEDBACK_KHR`, then the `pNext` chain must include a VkQueryPoolVideoEncodeFeedbackCreateInfoKHR structure

- VUID-VkQueryPoolCreateInfo-queryType-07907
  If `queryType` is `VK_QUERY_TYPE_VIDEO_ENCODE_FEEDBACK_KHR`, and the `pNext` chain includes a VkVideoProfileInfoKHR structure and a VkQueryPoolVideoEncodeFeedbackCreateInfoKHR structure, then VkQueryPoolVideoEncodeFeedbackCreateInfoKHR::`encodeFeedbackFlags` must not contain any bits that are not set in VkVideoEncodeCapabilitiesKHR::`supportedEncodeFeedbackFlags`, as returned by vkGetPhysicalDeviceVideoCapabilitiesKHR for the video profile described by VkVideoProfileInfoKHR and its `pNext` chain

- VUID-VkQueryPoolCreateInfo-pNext-10248
  If the `pNext` chain includes a VkVideoProfileInfoKHR structure and its `videoCodecOperation` member is `VK_VIDEO_CODEC_OPERATION_ENCODE_AV1_BIT_KHR`, then the `videoEncodeAV1` feature must be enabled

Valid Usage (Implicit)

- VUID-VkQueryPoolCreateInfo-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_QUERY_POOL_CREATE_INFO`

- VUID-VkQueryPoolCreateInfo-pNext-pNext
  Each `pNext` member of any structure (including this one) in the `pNext` chain must be either `NULL` or a pointer to a valid instance of VkQueryPoolPerformanceCreateInfoKHR, VkQueryPoolPerformanceQueryCreateInfoINTEL, VkQueryPoolVideoEncodeFeedbackCreateInfoKHR, VkVideoDecodeAV1ProfileInfoKHR, VkVideoDecodeH264ProfileInfoKHR, VkVideoDecodeH265ProfileInfoKHR, VkVideoDecodeUsageInfoKHR, VkVideoEncodeAV1ProfileInfoKHR, VkVideoEncodeH264ProfileInfoKHR, VkVideoEncodeH265ProfileInfoKHR, VkVideoEncodeUsageInfoKHR, or VkVideoProfileInfoKHR

- VUID-VkQueryPoolCreateInfo-sType-unique
  The `sType` value of each struct in the `pNext` chain must be unique

- VUID-VkQueryPoolCreateInfo-flags-zerobitmask
  `flags` must be `0`

- VUID-VkQueryPoolCreateInfo-queryType-parameter
  `queryType` must be a valid VkQueryType value

    // Provided by VK_VERSION_1_0
    typedef VkFlags VkQueryPoolCreateFlags;

`VkQueryPoolCreateFlags` is a bitmask type for setting a mask, but is currently reserved for future use.

The `VkQueryPoolPerformanceCreateInfoKHR` structure is defined as:

    // Provided by VK_KHR_performance_query
    typedef struct VkQueryPoolPerformanceCreateInfoKHR {
        VkStructureType    sType;
        const void*        pNext;
        uint32_t           queueFamilyIndex;
        uint32_t           counterIndexCount;
        const uint32_t*    pCounterIndices;
    } VkQueryPoolPerformanceCreateInfoKHR;

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `queueFamilyIndex` is the queue family index to create this performance query pool for.

- `counterIndexCount` is the length of the `pCounterIndices` array.

- `pCounterIndices` is a pointer to an array of indices into the vkEnumeratePhysicalDeviceQueueFamilyPerformanceQueryCountersKHR::`pCounters` to enable in this performance query pool.

Valid Usage

- VUID-VkQueryPoolPerformanceCreateInfoKHR-queueFamilyIndex-03236
  `queueFamilyIndex` must be a valid queue family index of the device

- VUID-VkQueryPoolPerformanceCreateInfoKHR-performanceCounterQueryPools-03237
  The `performanceCounterQueryPools` feature must be enabled

- VUID-VkQueryPoolPerformanceCreateInfoKHR-pCounterIndices-03321
  Each element of `pCounterIndices` must be in the range of counters reported by `vkEnumeratePhysicalDeviceQueueFamilyPerformanceQueryCountersKHR` for the queue family specified in `queueFamilyIndex`

Valid Usage (Implicit)

- VUID-VkQueryPoolPerformanceCreateInfoKHR-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_QUERY_POOL_PERFORMANCE_CREATE_INFO_KHR`

- VUID-VkQueryPoolPerformanceCreateInfoKHR-pCounterIndices-parameter
  `pCounterIndices` must be a valid pointer to an array of `counterIndexCount` `uint32_t` values

- VUID-VkQueryPoolPerformanceCreateInfoKHR-counterIndexCount-arraylength
  `counterIndexCount` must be greater than `0`

To query the number of passes required to query a performance query pool on a physical device, call:

    // Provided by VK_KHR_performance_query
    void vkGetPhysicalDeviceQueueFamilyPerformanceQueryPassesKHR(
        VkPhysicalDevice                            physicalDevice,
        const VkQueryPoolPerformanceCreateInfoKHR*  pPerformanceQueryCreateInfo,
        uint32_t*                                   pNumPasses);

- `physicalDevice` is the handle to the physical device whose queue family performance query counter properties will be queried.

- `pPerformanceQueryCreateInfo` is a pointer to a `VkQueryPoolPerformanceCreateInfoKHR` of the performance query that is to be created.

- `pNumPasses` is a pointer to an integer related to the number of passes required to query the performance query pool, as described below.

The `pPerformanceQueryCreateInfo` member `VkQueryPoolPerformanceCreateInfoKHR`::`queueFamilyIndex` must be a queue family of `physicalDevice`. The number of passes required to capture the counters specified in the `pPerformanceQueryCreateInfo` member `VkQueryPoolPerformanceCreateInfoKHR`::`pCounters` is returned in `pNumPasses`.

Valid Usage (Implicit)

- VUID-vkGetPhysicalDeviceQueueFamilyPerformanceQueryPassesKHR-physicalDevice-parameter
  `physicalDevice` must be a valid VkPhysicalDevice handle

- VUID-vkGetPhysicalDeviceQueueFamilyPerformanceQueryPassesKHR-pPerformanceQueryCreateInfo-parameter
  `pPerformanceQueryCreateInfo` must be a valid pointer to a valid VkQueryPoolPerformanceCreateInfoKHR structure

- VUID-vkGetPhysicalDeviceQueueFamilyPerformanceQueryPassesKHR-pNumPasses-parameter
  `pNumPasses` must be a valid pointer to a `uint32_t` value

To destroy a query pool, call:

    // Provided by VK_VERSION_1_0
    void vkDestroyQueryPool(
        VkDevice                                    device,
        VkQueryPool                                 queryPool,
        const VkAllocationCallbacks*                pAllocator);

- `device` is the logical device that destroys the query pool.

- `queryPool` is the query pool to destroy.

- `pAllocator` controls host memory allocation as described in the Memory Allocation chapter.

Valid Usage

- VUID-vkDestroyQueryPool-queryPool-00793
  All submitted commands that refer to `queryPool` must have completed execution

- VUID-vkDestroyQueryPool-queryPool-00794
  If `VkAllocationCallbacks` were provided when `queryPool` was created, a compatible set of callbacks must be provided here

- VUID-vkDestroyQueryPool-queryPool-00795
  If no `VkAllocationCallbacks` were provided when `queryPool` was created, `pAllocator` must be `NULL`

Note | Applications can verify that `queryPool` can be destroyed by checking that `vkGetQueryPoolResults`() without the `VK_QUERY_RESULT_PARTIAL_BIT` flag returns `VK_SUCCESS` for all queries that are used in command buffers submitted for execution.

Valid Usage (Implicit)

- VUID-vkDestroyQueryPool-device-parameter
  `device` must be a valid VkDevice handle

- VUID-vkDestroyQueryPool-queryPool-parameter
  If `queryPool` is not VK_NULL_HANDLE, `queryPool` must be a valid VkQueryPool handle

- VUID-vkDestroyQueryPool-pAllocator-parameter
  If `pAllocator` is not `NULL`, `pAllocator` must be a valid pointer to a valid VkAllocationCallbacks structure

- VUID-vkDestroyQueryPool-queryPool-parent
  If `queryPool` is a valid handle, it must have been created, allocated, or retrieved from `device`

Host Synchronization

- Host access to `queryPool` must be externally synchronized

Possible values of VkQueryPoolCreateInfo::`queryType`, specifying the type of queries managed by the pool, are:

    // Provided by VK_VERSION_1_0
    typedef enum VkQueryType {
        VK_QUERY_TYPE_OCCLUSION = 0,
        VK_QUERY_TYPE_PIPELINE_STATISTICS = 1,
        VK_QUERY_TYPE_TIMESTAMP = 2,
      // Provided by VK_KHR_video_queue
        VK_QUERY_TYPE_RESULT_STATUS_ONLY_KHR = 1000023000,
      // Provided by VK_EXT_transform_feedback
        VK_QUERY_TYPE_TRANSFORM_FEEDBACK_STREAM_EXT = 1000028004,
      // Provided by VK_KHR_performance_query
        VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR = 1000116000,
      // Provided by VK_KHR_acceleration_structure
        VK_QUERY_TYPE_ACCELERATION_STRUCTURE_COMPACTED_SIZE_KHR = 1000150000,
      // Provided by VK_KHR_acceleration_structure
        VK_QUERY_TYPE_ACCELERATION_STRUCTURE_SERIALIZATION_SIZE_KHR = 1000150001,
      // Provided by VK_NV_ray_tracing
        VK_QUERY_TYPE_ACCELERATION_STRUCTURE_COMPACTED_SIZE_NV = 1000165000,
      // Provided by VK_INTEL_performance_query
        VK_QUERY_TYPE_PERFORMANCE_QUERY_INTEL = 1000210000,
      // Provided by VK_KHR_video_encode_queue
        VK_QUERY_TYPE_VIDEO_ENCODE_FEEDBACK_KHR = 1000299000,
      // Provided by VK_EXT_mesh_shader
        VK_QUERY_TYPE_MESH_PRIMITIVES_GENERATED_EXT = 1000328000,
      // Provided by VK_EXT_primitives_generated_query
        VK_QUERY_TYPE_PRIMITIVES_GENERATED_EXT = 1000382000,
      // Provided by VK_KHR_ray_tracing_maintenance1
        VK_QUERY_TYPE_ACCELERATION_STRUCTURE_SERIALIZATION_BOTTOM_LEVEL_POINTERS_KHR = 1000386000,
      // Provided by VK_KHR_ray_tracing_maintenance1
        VK_QUERY_TYPE_ACCELERATION_STRUCTURE_SIZE_KHR = 1000386001,
      // Provided by VK_EXT_opacity_micromap
        VK_QUERY_TYPE_MICROMAP_SERIALIZATION_SIZE_EXT = 1000396000,
      // Provided by VK_EXT_opacity_micromap
        VK_QUERY_TYPE_MICROMAP_COMPACTED_SIZE_EXT = 1000396001,
    } VkQueryType;

- `VK_QUERY_TYPE_OCCLUSION` specifies an occlusion query.

- `VK_QUERY_TYPE_PIPELINE_STATISTICS` specifies a pipeline statistics query.

- `VK_QUERY_TYPE_TIMESTAMP` specifies a timestamp query.

- `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR` specifies a performance query.

- `VK_QUERY_TYPE_TRANSFORM_FEEDBACK_STREAM_EXT` specifies a transform feedback query.

- `VK_QUERY_TYPE_PRIMITIVES_GENERATED_EXT` specifies a primitives generated query.

- `VK_QUERY_TYPE_ACCELERATION_STRUCTURE_COMPACTED_SIZE_KHR` specifies a acceleration structure size query for use with vkCmdWriteAccelerationStructuresPropertiesKHR or vkWriteAccelerationStructuresPropertiesKHR.

- `VK_QUERY_TYPE_ACCELERATION_STRUCTURE_SERIALIZATION_SIZE_KHR` specifies a serialization acceleration structure size query.

- `VK_QUERY_TYPE_ACCELERATION_STRUCTURE_SIZE_KHR` specifies an acceleration structure size query for use with vkCmdWriteAccelerationStructuresPropertiesKHR or vkWriteAccelerationStructuresPropertiesKHR.

- `VK_QUERY_TYPE_ACCELERATION_STRUCTURE_SERIALIZATION_BOTTOM_LEVEL_POINTERS_KHR` specifies a serialization acceleration structure pointer count query.

- `VK_QUERY_TYPE_ACCELERATION_STRUCTURE_COMPACTED_SIZE_NV` specifies an acceleration structure size query for use with vkCmdWriteAccelerationStructuresPropertiesNV.

- `VK_QUERY_TYPE_PERFORMANCE_QUERY_INTEL` specifies a Intel performance query.

- `VK_QUERY_TYPE_RESULT_STATUS_ONLY_KHR` specifies a result status query.

- `VK_QUERY_TYPE_VIDEO_ENCODE_FEEDBACK_KHR` specifies a video encode feedback query.

- `VK_QUERY_TYPE_MESH_PRIMITIVES_GENERATED_EXT` specifies a generated mesh primitives query.

### 18.2. Query Operation

The operation of queries is controlled by the commands vkCmdBeginQuery, vkCmdEndQuery, vkCmdBeginQueryIndexedEXT, vkCmdEndQueryIndexedEXT, vkCmdResetQueryPool, vkCmdCopyQueryPoolResults, vkCmdWriteTimestamp2, and vkCmdWriteTimestamp.

In order for a `VkCommandBuffer` to record query management commands, the queue family for which its `VkCommandPool` was created must support the appropriate type of operations (graphics, compute) suitable for the query type of a given query pool.

Each query in a query pool has a status that is either unavailable or available, and also has state to store the numerical results of a query operation of the type requested when the query pool was created. Resetting a query via vkCmdResetQueryPool or vkResetQueryPool sets the status to unavailable and makes the numerical results undefined. A query is made available by the operation of vkCmdEndQuery, vkCmdEndQueryIndexedEXT, vkCmdWriteTimestamp2, or vkCmdWriteTimestamp. Both the availability status and numerical results can be retrieved by calling either vkGetQueryPoolResults or vkCmdCopyQueryPoolResults.

After query pool creation, each query is in an uninitialized state and must be reset before it is used. Queries must also be reset between uses.

If a logical device includes multiple physical devices, then each command that writes a query must execute on a single physical device, and any call to vkCmdBeginQuery must execute the corresponding vkCmdEndQuery command on the same physical device.

To reset a range of queries in a query pool on a queue, call:

    // Provided by VK_VERSION_1_0
    void vkCmdResetQueryPool(
        VkCommandBuffer                             commandBuffer,
        VkQueryPool                                 queryPool,
        uint32_t                                    firstQuery,
        uint32_t                                    queryCount);

- `commandBuffer` is the command buffer into which this command will be recorded.

- `queryPool` is the handle of the query pool managing the queries being reset.

- `firstQuery` is the initial query index to reset.

- `queryCount` is the number of queries to reset.

When executed on a queue, this command sets the status of query indices [`firstQuery`, `firstQuery` + `queryCount` - 1] to unavailable.

This command defines an execution dependency between other query commands that reference the same query.

The first synchronization scope includes all commands which reference the queries in `queryPool` indicated by `firstQuery` and `queryCount` that occur earlier in submission order.

The second synchronization scope includes all commands which reference the queries in `queryPool` indicated by `firstQuery` and `queryCount` that occur later in submission order.

The operation of this command happens after the first scope and happens before the second scope.

If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR`, this command sets the status of query indices [`firstQuery`, `firstQuery` + `queryCount` - 1] to unavailable for each pass of `queryPool`, as indicated by a call to vkGetPhysicalDeviceQueueFamilyPerformanceQueryPassesKHR.

Note | Because `vkCmdResetQueryPool` resets all the passes of the indicated queries, applications must not record a `vkCmdResetQueryPool` command for a `queryPool` created with `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR` in a command buffer that needs to be submitted multiple times as indicated by a call to vkGetPhysicalDeviceQueueFamilyPerformanceQueryPassesKHR. Otherwise applications will never be able to complete the recorded queries.

Valid Usage

- VUID-vkCmdResetQueryPool-firstQuery-09436
  `firstQuery` must be less than the number of queries in `queryPool`

- VUID-vkCmdResetQueryPool-firstQuery-09437
  The sum of `firstQuery` and `queryCount` must be less than or equal to the number of queries in `queryPool`

- VUID-vkCmdResetQueryPool-None-02841
  All queries used by the command must not be active

- VUID-vkCmdResetQueryPool-firstQuery-02862
  If `queryPool` was created with `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR`, this command must not be recorded in a command buffer that, either directly or through secondary command buffers, also contains begin commands for a query from the set of queries [`firstQuery`, `firstQuery` + `queryCount` - 1]

Valid Usage (Implicit)

- VUID-vkCmdResetQueryPool-commandBuffer-parameter
  `commandBuffer` must be a valid VkCommandBuffer handle

- VUID-vkCmdResetQueryPool-queryPool-parameter
  `queryPool` must be a valid VkQueryPool handle

- VUID-vkCmdResetQueryPool-commandBuffer-recording
  `commandBuffer` must be in the recording state

- VUID-vkCmdResetQueryPool-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support graphics, compute, decode, encode, or optical flow operations

- VUID-vkCmdResetQueryPool-renderpass
  This command must only be called outside of a render pass instance

- VUID-vkCmdResetQueryPool-videocoding
  This command must only be called outside of a video coding scope

- VUID-vkCmdResetQueryPool-commonparent
  Both of `commandBuffer`, and `queryPool` must have been created, allocated, or retrieved from the same VkDevice

Host Synchronization

- Host access to `commandBuffer` must be externally synchronized

- Host access to the `VkCommandPool` that `commandBuffer` was allocated from must be externally synchronized

Command Properties

Command Buffer Levels | Render Pass Scope | Video Coding Scope | Supported Queue Types | Command Type
--- | --- | --- | --- | ---
Primary Secondary | Outside | Outside | Graphics Compute Decode Encode Opticalflow | Action

To reset a range of queries in a query pool on the host, call:

    // Provided by VK_VERSION_1_2
    void vkResetQueryPool(
        VkDevice                                    device,
        VkQueryPool                                 queryPool,
        uint32_t                                    firstQuery,
        uint32_t                                    queryCount);

or the equivalent command

    // Provided by VK_EXT_host_query_reset
    void vkResetQueryPoolEXT(
        VkDevice                                    device,
        VkQueryPool                                 queryPool,
        uint32_t                                    firstQuery,
        uint32_t                                    queryCount);

- `device` is the logical device that owns the query pool.

- `queryPool` is the handle of the query pool managing the queries being reset.

- `firstQuery` is the initial query index to reset.

- `queryCount` is the number of queries to reset.

This command sets the status of query indices [`firstQuery`, `firstQuery` + `queryCount` - 1] to unavailable.

If `queryPool` is `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR` this command sets the status of query indices [`firstQuery`, `firstQuery` + `queryCount` - 1] to unavailable for each pass.

Valid Usage

- VUID-vkResetQueryPool-firstQuery-09436
  `firstQuery` must be less than the number of queries in `queryPool`

- VUID-vkResetQueryPool-firstQuery-09437
  The sum of `firstQuery` and `queryCount` must be less than or equal to the number of queries in `queryPool`

- VUID-vkResetQueryPool-None-02665
  The `hostQueryReset` feature must be enabled

- VUID-vkResetQueryPool-firstQuery-02741
  Submitted commands that refer to the range specified by `firstQuery` and `queryCount` in `queryPool` must have completed execution

- VUID-vkResetQueryPool-firstQuery-02742
  The range of queries specified by `firstQuery` and `queryCount` in `queryPool` must not be in use by calls to vkGetQueryPoolResults or `vkResetQueryPool` in other threads

Valid Usage (Implicit)

- VUID-vkResetQueryPool-device-parameter
  `device` must be a valid VkDevice handle

- VUID-vkResetQueryPool-queryPool-parameter
  `queryPool` must be a valid VkQueryPool handle

- VUID-vkResetQueryPool-queryPool-parent
  `queryPool` must have been created, allocated, or retrieved from `device`

Once queries are reset and ready for use, query commands can be issued to a command buffer. Occlusion queries and pipeline statistics queries count events - drawn samples and pipeline stage invocations, respectively - resulting from commands that are recorded between a vkCmdBeginQuery command and a vkCmdEndQuery command within a specified command buffer, effectively scoping a set of drawing and/or dispatching commands. Timestamp queries write timestamps to a query pool. Performance queries record performance counters to a query pool.

A query must begin and end in the same command buffer, although if it is a primary command buffer, and the `inheritedQueries` feature is enabled, it can execute secondary command buffers during the query operation. For a secondary command buffer to be executed while a query is active, it must set the `occlusionQueryEnable`, `queryFlags`, and/or `pipelineStatistics` members of VkCommandBufferInheritanceInfo to conservative values, as described in the Command Buffer Recording section. A query must either begin and end inside the same subpass of a render pass instance, or must both begin and end outside of a render pass instance (i.e. contain entire render pass instances).

If queries are used while executing a render pass instance that has multiview enabled, the query uses N consecutive query indices in the query pool (starting at `query`) where N is the number of bits set in the view mask in the subpass the query is used in. How the numerical results of the query are distributed among the queries is implementation-dependent. For example, some implementations may write each view’s results to a distinct query, while other implementations may write the total result to the first query and write zero to the other queries. However, the sum of the results in all the queries must accurately reflect the total result of the query summed over all views. Applications can sum the results from all the queries to compute the total result.

Queries used with multiview rendering must not span subpasses, i.e. they must begin and end in the same subpass.

A query must either begin and end inside the same video coding scope, or must both begin and end outside of a video coding scope and must not contain entire video coding scopes.

To begin a query, call:

    // Provided by VK_VERSION_1_0
    void vkCmdBeginQuery(
        VkCommandBuffer                             commandBuffer,
        VkQueryPool                                 queryPool,
        uint32_t                                    query,
        VkQueryControlFlags                         flags);

- `commandBuffer` is the command buffer into which this command will be recorded.

- `queryPool` is the query pool that will manage the results of the query.

- `query` is the query index within the query pool that will contain the results.

- `flags` is a bitmask of VkQueryControlFlagBits specifying constraints on the types of queries that can be performed.

If the `queryType` of the pool is `VK_QUERY_TYPE_OCCLUSION` and `flags` contains `VK_QUERY_CONTROL_PRECISE_BIT`, an implementation must return a result that matches the actual number of samples passed. This is described in more detail in Occlusion Queries.

Calling `vkCmdBeginQuery` is equivalent to calling vkCmdBeginQueryIndexedEXT with the `index` parameter set to zero.

After beginning a query, that query is considered active within the command buffer it was called in until that same query is ended. Queries active in a primary command buffer when secondary command buffers are executed are considered active for those secondary command buffers.

Furthermore, if the query is started within a video coding scope, the following command buffer states are initialized for the query type:

- The active_query_index is set to the value specified by `query`.

- The last activatable query index is also set to the value specified by `query`.

Each video coding operation stores a result to the query corresponding to the current active query index, followed by incrementing the active query index. If the active query index gets incremented past the last activatable query index, issuing any further video coding operations results in undefined behavior.

Note | In practice, this means that currently no more than a single video coding operation must be issued between a begin and end query pair.

This command defines an execution dependency between other query commands that reference the same query.

The first synchronization scope includes all commands which reference the queries in `queryPool` indicated by `query` that occur earlier in submission order.

The second synchronization scope includes all commands which reference the queries in `queryPool` indicated by `query` that occur later in submission order.

The operation of this command happens after the first scope and happens before the second scope.

Valid Usage

- VUID-vkCmdBeginQuery-None-00807
  All queries used by the command must be unavailable

- VUID-vkCmdBeginQuery-queryType-02804
  The `queryType` used to create `queryPool` must not be `VK_QUERY_TYPE_TIMESTAMP`

- VUID-vkCmdBeginQuery-queryType-04728
  The `queryType` used to create `queryPool` must not be `VK_QUERY_TYPE_ACCELERATION_STRUCTURE_COMPACTED_SIZE_KHR` or `VK_QUERY_TYPE_ACCELERATION_STRUCTURE_SERIALIZATION_SIZE_KHR`

- VUID-vkCmdBeginQuery-queryType-06741
  The `queryType` used to create `queryPool` must not be `VK_QUERY_TYPE_ACCELERATION_STRUCTURE_SIZE_KHR` or `VK_QUERY_TYPE_ACCELERATION_STRUCTURE_SERIALIZATION_BOTTOM_LEVEL_POINTERS_KHR`

- VUID-vkCmdBeginQuery-queryType-04729
  The `queryType` used to create `queryPool` must not be `VK_QUERY_TYPE_ACCELERATION_STRUCTURE_COMPACTED_SIZE_NV`

- VUID-vkCmdBeginQuery-queryType-00800
  If the `occlusionQueryPrecise` feature is not enabled, or the `queryType` used to create `queryPool` was not `VK_QUERY_TYPE_OCCLUSION`, `flags` must not contain `VK_QUERY_CONTROL_PRECISE_BIT`

- VUID-vkCmdBeginQuery-query-00802
  `query` must be less than the number of queries in `queryPool`

- VUID-vkCmdBeginQuery-queryType-00803
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_OCCLUSION`, the `VkCommandPool` that `commandBuffer` was allocated from must support graphics operations

- VUID-vkCmdBeginQuery-queryType-00804
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_PIPELINE_STATISTICS` and any of the `pipelineStatistics` indicate graphics operations, the `VkCommandPool` that `commandBuffer` was allocated from must support graphics operations

- VUID-vkCmdBeginQuery-queryType-00805
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_PIPELINE_STATISTICS` and any of the `pipelineStatistics` indicate compute operations, the `VkCommandPool` that `commandBuffer` was allocated from must support compute operations

- VUID-vkCmdBeginQuery-commandBuffer-01885
  `commandBuffer` must not be a protected command buffer

- VUID-vkCmdBeginQuery-query-00808
  If called within a render pass instance, the sum of `query` and the number of bits set in the current subpass’s view mask must be less than or equal to the number of queries in `queryPool`

- VUID-vkCmdBeginQuery-queryType-07126
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_RESULT_STATUS_ONLY_KHR`, then the `VkCommandPool` that `commandBuffer` was allocated from must have been created with a queue family index that supports result status queries, as indicated by VkQueueFamilyQueryResultStatusPropertiesKHR::`queryResultStatusSupport`

- VUID-vkCmdBeginQuery-None-07127
  If there is a bound video session, then there must be no active queries

- VUID-vkCmdBeginQuery-None-08370
  If there is a bound video session, then it must not have been created with `VK_VIDEO_SESSION_CREATE_INLINE_QUERIES_BIT_KHR`

- VUID-vkCmdBeginQuery-queryType-07128
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_RESULT_STATUS_ONLY_KHR` and there is a bound video session, then `queryPool` must have been created with a VkVideoProfileInfoKHR structure included in the `pNext` chain of VkQueryPoolCreateInfo identical to the one specified in VkVideoSessionCreateInfoKHR::`pVideoProfile` the bound video session was created with

- VUID-vkCmdBeginQuery-queryType-07129
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_VIDEO_ENCODE_FEEDBACK_KHR`, then there must be a bound video session

- VUID-vkCmdBeginQuery-queryType-07130
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_VIDEO_ENCODE_FEEDBACK_KHR` and there is a bound video session, then `queryPool` must have been created with a VkVideoProfileInfoKHR structure included in the `pNext` chain of VkQueryPoolCreateInfo identical to the one specified in VkVideoSessionCreateInfoKHR::`pVideoProfile` the bound video session was created with

- VUID-vkCmdBeginQuery-queryType-07131
  If the `queryType` used to create `queryPool` was not `VK_QUERY_TYPE_RESULT_STATUS_ONLY_KHR` or `VK_QUERY_TYPE_VIDEO_ENCODE_FEEDBACK_KHR`, then there must be no bound video session

- VUID-vkCmdBeginQuery-queryPool-01922
  `queryPool` must have been created with a `queryType` that differs from that of any queries that are active within `commandBuffer`

- VUID-vkCmdBeginQuery-queryType-07070
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_MESH_PRIMITIVES_GENERATED_EXT` the `VkCommandPool` that `commandBuffer` was allocated from must support graphics operations

- VUID-vkCmdBeginQuery-queryType-02327
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_TRANSFORM_FEEDBACK_STREAM_EXT` the `VkCommandPool` that `commandBuffer` was allocated from must support graphics operations

- VUID-vkCmdBeginQuery-queryType-02328
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_TRANSFORM_FEEDBACK_STREAM_EXT` then `VkPhysicalDeviceTransformFeedbackPropertiesEXT`::`transformFeedbackQueries` must be supported

- VUID-vkCmdBeginQuery-queryType-06687
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_PRIMITIVES_GENERATED_EXT` the `VkCommandPool` that `commandBuffer` was allocated from must support graphics operations

- VUID-vkCmdBeginQuery-queryType-06688
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_PRIMITIVES_GENERATED_EXT` then `primitivesGeneratedQuery` must be enabled

- VUID-vkCmdBeginQuery-queryPool-07289
  If `queryPool` was created with a `queryType` of `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR`, then the VkQueryPoolPerformanceCreateInfoKHR::`queueFamilyIndex` `queryPool` was created with must equal the queue family index of the `VkCommandPool` that `commandBuffer` was allocated from

- VUID-vkCmdBeginQuery-queryPool-03223
  If `queryPool` was created with a `queryType` of `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR`, the profiling lock must have been held before vkBeginCommandBuffer was called on `commandBuffer`

- VUID-vkCmdBeginQuery-queryPool-03224
  If `queryPool` was created with a `queryType` of `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR` and one of the counters used to create `queryPool` was `VK_PERFORMANCE_COUNTER_SCOPE_COMMAND_BUFFER_KHR`, the query begin must be the first recorded command in `commandBuffer`

- VUID-vkCmdBeginQuery-queryPool-03225
  If `queryPool` was created with a `queryType` of `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR` and one of the counters used to create `queryPool` was `VK_PERFORMANCE_COUNTER_SCOPE_RENDER_PASS_KHR`, the begin command must not be recorded within a render pass instance

- VUID-vkCmdBeginQuery-queryPool-03226
  If `queryPool` was created with a `queryType` of `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR` and another query pool with a `queryType` `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR` has been used within `commandBuffer`, its parent primary command buffer or secondary command buffer recorded within the same parent primary command buffer as `commandBuffer`, the `performanceCounterMultipleQueryPools` feature must be enabled

- VUID-vkCmdBeginQuery-None-02863
  If `queryPool` was created with a `queryType` of `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR`, this command must not be recorded in a command buffer that, either directly or through secondary command buffers, also contains a `vkCmdResetQueryPool` command affecting the same query

Valid Usage (Implicit)

- VUID-vkCmdBeginQuery-commandBuffer-parameter
  `commandBuffer` must be a valid VkCommandBuffer handle

- VUID-vkCmdBeginQuery-queryPool-parameter
  `queryPool` must be a valid VkQueryPool handle

- VUID-vkCmdBeginQuery-flags-parameter
  `flags` must be a valid combination of VkQueryControlFlagBits values

- VUID-vkCmdBeginQuery-commandBuffer-recording
  `commandBuffer` must be in the recording state

- VUID-vkCmdBeginQuery-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support graphics, compute, decode, or encode operations

- VUID-vkCmdBeginQuery-commonparent
  Both of `commandBuffer`, and `queryPool` must have been created, allocated, or retrieved from the same VkDevice

Host Synchronization

- Host access to `commandBuffer` must be externally synchronized

- Host access to the `VkCommandPool` that `commandBuffer` was allocated from must be externally synchronized

Command Properties

Command Buffer Levels | Render Pass Scope | Video Coding Scope | Supported Queue Types | Command Type
--- | --- | --- | --- | ---
Primary Secondary | Both | Both | Graphics Compute Decode Encode | Action State

To begin an indexed query, call:

    // Provided by VK_EXT_transform_feedback
    void vkCmdBeginQueryIndexedEXT(
        VkCommandBuffer                             commandBuffer,
        VkQueryPool                                 queryPool,
        uint32_t                                    query,
        VkQueryControlFlags                         flags,
        uint32_t                                    index);

- `commandBuffer` is the command buffer into which this command will be recorded.

- `queryPool` is the query pool that will manage the results of the query.

- `query` is the query index within the query pool that will contain the results.

- `flags` is a bitmask of VkQueryControlFlagBits specifying constraints on the types of queries that can be performed.

- `index` is the query type specific index. When the query type is `VK_QUERY_TYPE_TRANSFORM_FEEDBACK_STREAM_EXT` or `VK_QUERY_TYPE_PRIMITIVES_GENERATED_EXT`, the index represents the vertex stream.

The `vkCmdBeginQueryIndexedEXT` command operates the same as the vkCmdBeginQuery command, except that it also accepts a query type specific `index` parameter.

This command defines an execution dependency between other query commands that reference the same query index.

The first synchronization scope includes all commands which reference the queries in `queryPool` indicated by `query` and `index` that occur earlier in submission order.

The second synchronization scope includes all commands which reference the queries in `queryPool` indicated by `query` and `index` that occur later in submission order.

The operation of this command happens after the first scope and happens before the second scope.

Valid Usage

- VUID-vkCmdBeginQueryIndexedEXT-None-00807
  All queries used by the command must be unavailable

- VUID-vkCmdBeginQueryIndexedEXT-queryType-02804
  The `queryType` used to create `queryPool` must not be `VK_QUERY_TYPE_TIMESTAMP`

- VUID-vkCmdBeginQueryIndexedEXT-queryType-04728
  The `queryType` used to create `queryPool` must not be `VK_QUERY_TYPE_ACCELERATION_STRUCTURE_COMPACTED_SIZE_KHR` or `VK_QUERY_TYPE_ACCELERATION_STRUCTURE_SERIALIZATION_SIZE_KHR`

- VUID-vkCmdBeginQueryIndexedEXT-queryType-06741
  The `queryType` used to create `queryPool` must not be `VK_QUERY_TYPE_ACCELERATION_STRUCTURE_SIZE_KHR` or `VK_QUERY_TYPE_ACCELERATION_STRUCTURE_SERIALIZATION_BOTTOM_LEVEL_POINTERS_KHR`

- VUID-vkCmdBeginQueryIndexedEXT-queryType-04729
  The `queryType` used to create `queryPool` must not be `VK_QUERY_TYPE_ACCELERATION_STRUCTURE_COMPACTED_SIZE_NV`

- VUID-vkCmdBeginQueryIndexedEXT-queryType-00800
  If the `occlusionQueryPrecise` feature is not enabled, or the `queryType` used to create `queryPool` was not `VK_QUERY_TYPE_OCCLUSION`, `flags` must not contain `VK_QUERY_CONTROL_PRECISE_BIT`

- VUID-vkCmdBeginQueryIndexedEXT-query-00802
  `query` must be less than the number of queries in `queryPool`

- VUID-vkCmdBeginQueryIndexedEXT-queryType-00803
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_OCCLUSION`, the `VkCommandPool` that `commandBuffer` was allocated from must support graphics operations

- VUID-vkCmdBeginQueryIndexedEXT-queryType-00804
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_PIPELINE_STATISTICS` and any of the `pipelineStatistics` indicate graphics operations, the `VkCommandPool` that `commandBuffer` was allocated from must support graphics operations

- VUID-vkCmdBeginQueryIndexedEXT-queryType-00805
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_PIPELINE_STATISTICS` and any of the `pipelineStatistics` indicate compute operations, the `VkCommandPool` that `commandBuffer` was allocated from must support compute operations

- VUID-vkCmdBeginQueryIndexedEXT-commandBuffer-01885
  `commandBuffer` must not be a protected command buffer

- VUID-vkCmdBeginQueryIndexedEXT-query-00808
  If called within a render pass instance, the sum of `query` and the number of bits set in the current subpass’s view mask must be less than or equal to the number of queries in `queryPool`

- VUID-vkCmdBeginQueryIndexedEXT-queryType-07126
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_RESULT_STATUS_ONLY_KHR`, then the `VkCommandPool` that `commandBuffer` was allocated from must have been created with a queue family index that supports result status queries, as indicated by VkQueueFamilyQueryResultStatusPropertiesKHR::`queryResultStatusSupport`

- VUID-vkCmdBeginQueryIndexedEXT-None-07127
  If there is a bound video session, then there must be no active queries

- VUID-vkCmdBeginQueryIndexedEXT-None-08370
  If there is a bound video session, then it must not have been created with `VK_VIDEO_SESSION_CREATE_INLINE_QUERIES_BIT_KHR`

- VUID-vkCmdBeginQueryIndexedEXT-queryType-07128
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_RESULT_STATUS_ONLY_KHR` and there is a bound video session, then `queryPool` must have been created with a VkVideoProfileInfoKHR structure included in the `pNext` chain of VkQueryPoolCreateInfo identical to the one specified in VkVideoSessionCreateInfoKHR::`pVideoProfile` the bound video session was created with

- VUID-vkCmdBeginQueryIndexedEXT-queryType-07129
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_VIDEO_ENCODE_FEEDBACK_KHR`, then there must be a bound video session

- VUID-vkCmdBeginQueryIndexedEXT-queryType-07130
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_VIDEO_ENCODE_FEEDBACK_KHR` and there is a bound video session, then `queryPool` must have been created with a VkVideoProfileInfoKHR structure included in the `pNext` chain of VkQueryPoolCreateInfo identical to the one specified in VkVideoSessionCreateInfoKHR::`pVideoProfile` the bound video session was created with

- VUID-vkCmdBeginQueryIndexedEXT-queryType-07131
  If the `queryType` used to create `queryPool` was not `VK_QUERY_TYPE_RESULT_STATUS_ONLY_KHR` or `VK_QUERY_TYPE_VIDEO_ENCODE_FEEDBACK_KHR`, then there must be no bound video session

- VUID-vkCmdBeginQueryIndexedEXT-queryPool-04753
  If the `queryPool` was created with the same `queryType` as that of another active query within `commandBuffer`, then `index` must not match the index used for the active query

- VUID-vkCmdBeginQueryIndexedEXT-queryType-02338
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_TRANSFORM_FEEDBACK_STREAM_EXT` the `VkCommandPool` that `commandBuffer` was allocated from must support graphics operations

- VUID-vkCmdBeginQueryIndexedEXT-queryType-02339
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_TRANSFORM_FEEDBACK_STREAM_EXT` the `index` parameter must be less than `VkPhysicalDeviceTransformFeedbackPropertiesEXT`::`maxTransformFeedbackStreams`

- VUID-vkCmdBeginQueryIndexedEXT-queryType-06692
  If the `queryType` used to create `queryPool` was not `VK_QUERY_TYPE_TRANSFORM_FEEDBACK_STREAM_EXT` and not `VK_QUERY_TYPE_PRIMITIVES_GENERATED_EXT`, the `index` must be zero

- VUID-vkCmdBeginQueryIndexedEXT-queryType-06689
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_PRIMITIVES_GENERATED_EXT` the `VkCommandPool` that `commandBuffer` was allocated from must support graphics operations

- VUID-vkCmdBeginQueryIndexedEXT-queryType-06690
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_PRIMITIVES_GENERATED_EXT` the `index` parameter must be less than `VkPhysicalDeviceTransformFeedbackPropertiesEXT`::`maxTransformFeedbackStreams`

- VUID-vkCmdBeginQueryIndexedEXT-queryType-06691
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_PRIMITIVES_GENERATED_EXT` and the `primitivesGeneratedQueryWithNonZeroStreams` feature is not enabled, the `index` parameter must be zero

- VUID-vkCmdBeginQueryIndexedEXT-queryType-06693
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_PRIMITIVES_GENERATED_EXT` then `primitivesGeneratedQuery` must be enabled

- VUID-vkCmdBeginQueryIndexedEXT-queryType-02341
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_TRANSFORM_FEEDBACK_STREAM_EXT` then `VkPhysicalDeviceTransformFeedbackPropertiesEXT`::`transformFeedbackQueries` must be supported

- VUID-vkCmdBeginQueryIndexedEXT-queryType-07071
  The `queryType` used to create `queryPool` must not be `VK_QUERY_TYPE_MESH_PRIMITIVES_GENERATED_EXT`

- VUID-vkCmdBeginQueryIndexedEXT-queryPool-07289
  If `queryPool` was created with a `queryType` of `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR`, then the VkQueryPoolPerformanceCreateInfoKHR::`queueFamilyIndex` `queryPool` was created with must equal the queue family index of the `VkCommandPool` that `commandBuffer` was allocated from

- VUID-vkCmdBeginQueryIndexedEXT-queryPool-03223
  If `queryPool` was created with a `queryType` of `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR`, the profiling lock must have been held before vkBeginCommandBuffer was called on `commandBuffer`

- VUID-vkCmdBeginQueryIndexedEXT-queryPool-03224
  If `queryPool` was created with a `queryType` of `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR` and one of the counters used to create `queryPool` was `VK_PERFORMANCE_COUNTER_SCOPE_COMMAND_BUFFER_KHR`, the query begin must be the first recorded command in `commandBuffer`

- VUID-vkCmdBeginQueryIndexedEXT-queryPool-03225
  If `queryPool` was created with a `queryType` of `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR` and one of the counters used to create `queryPool` was `VK_PERFORMANCE_COUNTER_SCOPE_RENDER_PASS_KHR`, the begin command must not be recorded within a render pass instance

- VUID-vkCmdBeginQueryIndexedEXT-queryPool-03226
  If `queryPool` was created with a `queryType` of `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR` and another query pool with a `queryType` `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR` has been used within `commandBuffer`, its parent primary command buffer or secondary command buffer recorded within the same parent primary command buffer as `commandBuffer`, the `performanceCounterMultipleQueryPools` feature must be enabled

- VUID-vkCmdBeginQueryIndexedEXT-None-02863
  If `queryPool` was created with a `queryType` of `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR`, this command must not be recorded in a command buffer that, either directly or through secondary command buffers, also contains a `vkCmdResetQueryPool` command affecting the same query

Valid Usage (Implicit)

- VUID-vkCmdBeginQueryIndexedEXT-commandBuffer-parameter
  `commandBuffer` must be a valid VkCommandBuffer handle

- VUID-vkCmdBeginQueryIndexedEXT-queryPool-parameter
  `queryPool` must be a valid VkQueryPool handle

- VUID-vkCmdBeginQueryIndexedEXT-flags-parameter
  `flags` must be a valid combination of VkQueryControlFlagBits values

- VUID-vkCmdBeginQueryIndexedEXT-commandBuffer-recording
  `commandBuffer` must be in the recording state

- VUID-vkCmdBeginQueryIndexedEXT-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support graphics, compute, decode, or encode operations

- VUID-vkCmdBeginQueryIndexedEXT-videocoding
  This command must only be called outside of a video coding scope

- VUID-vkCmdBeginQueryIndexedEXT-commonparent
  Both of `commandBuffer`, and `queryPool` must have been created, allocated, or retrieved from the same VkDevice

Host Synchronization

- Host access to `commandBuffer` must be externally synchronized

- Host access to the `VkCommandPool` that `commandBuffer` was allocated from must be externally synchronized

Command Properties

Command Buffer Levels | Render Pass Scope | Video Coding Scope | Supported Queue Types | Command Type
--- | --- | --- | --- | ---
Primary Secondary | Both | Outside | Graphics Compute Decode Encode | Action State

Bits which can be set in vkCmdBeginQuery::`flags`, specifying constraints on the types of queries that can be performed, are:

    // Provided by VK_VERSION_1_0
    typedef enum VkQueryControlFlagBits {
        VK_QUERY_CONTROL_PRECISE_BIT = 0x00000001,
    } VkQueryControlFlagBits;

- `VK_QUERY_CONTROL_PRECISE_BIT` specifies the precision of occlusion queries.

    // Provided by VK_VERSION_1_0
    typedef VkFlags VkQueryControlFlags;

`VkQueryControlFlags` is a bitmask type for setting a mask of zero or more VkQueryControlFlagBits.

To end a query after the set of desired drawing or dispatching commands is executed, call:

    // Provided by VK_VERSION_1_0
    void vkCmdEndQuery(
        VkCommandBuffer                             commandBuffer,
        VkQueryPool                                 queryPool,
        uint32_t                                    query);

- `commandBuffer` is the command buffer into which this command will be recorded.

- `queryPool` is the query pool that is managing the results of the query.

- `query` is the query index within the query pool where the result is stored.

The command completes the query in `queryPool` identified by `query`, and marks it as available.

This command defines an execution dependency between other query commands that reference the same query.

The first synchronization scope includes all commands which reference the queries in `queryPool` indicated by `query` that occur earlier in submission order.

The second synchronization scope includes only the operation of this command.

Calling `vkCmdEndQuery` is equivalent to calling vkCmdEndQueryIndexedEXT with the `index` parameter set to zero.

Valid Usage

- VUID-vkCmdEndQuery-None-01923
  All queries used by the command must be active

- VUID-vkCmdEndQuery-query-00810
  `query` must be less than the number of queries in `queryPool`

- VUID-vkCmdEndQuery-commandBuffer-01886
  `commandBuffer` must not be a protected command buffer

- VUID-vkCmdEndQuery-query-00812
  If `vkCmdEndQuery` is called within a render pass instance, the sum of `query` and the number of bits set in the current subpass’s view mask must be less than or equal to the number of queries in `queryPool`

- VUID-vkCmdEndQuery-queryPool-03227
  If `queryPool` was created with a `queryType` of `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR` and one or more of the counters used to create `queryPool` was `VK_PERFORMANCE_COUNTER_SCOPE_COMMAND_BUFFER_KHR`, the vkCmdEndQuery must be the last recorded command in `commandBuffer`

- VUID-vkCmdEndQuery-queryPool-03228
  If `queryPool` was created with a `queryType` of `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR` and one or more of the counters used to create `queryPool` was `VK_PERFORMANCE_COUNTER_SCOPE_RENDER_PASS_KHR`, the vkCmdEndQuery must not be recorded within a render pass instance

- VUID-vkCmdEndQuery-None-07007
  If called within a subpass of a render pass instance, the corresponding `vkCmdBeginQuery`* command must have been called previously within the same subpass

Valid Usage (Implicit)

- VUID-vkCmdEndQuery-commandBuffer-parameter
  `commandBuffer` must be a valid VkCommandBuffer handle

- VUID-vkCmdEndQuery-queryPool-parameter
  `queryPool` must be a valid VkQueryPool handle

- VUID-vkCmdEndQuery-commandBuffer-recording
  `commandBuffer` must be in the recording state

- VUID-vkCmdEndQuery-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support graphics, compute, decode, or encode operations

- VUID-vkCmdEndQuery-commonparent
  Both of `commandBuffer`, and `queryPool` must have been created, allocated, or retrieved from the same VkDevice

Host Synchronization

- Host access to `commandBuffer` must be externally synchronized

- Host access to the `VkCommandPool` that `commandBuffer` was allocated from must be externally synchronized

Command Properties

Command Buffer Levels | Render Pass Scope | Video Coding Scope | Supported Queue Types | Command Type
--- | --- | --- | --- | ---
Primary Secondary | Both | Both | Graphics Compute Decode Encode | Action State

To end an indexed query after the set of desired drawing or dispatching commands is recorded, call:

    // Provided by VK_EXT_transform_feedback
    void vkCmdEndQueryIndexedEXT(
        VkCommandBuffer                             commandBuffer,
        VkQueryPool                                 queryPool,
        uint32_t                                    query,
        uint32_t                                    index);

- `commandBuffer` is the command buffer into which this command will be recorded.

- `queryPool` is the query pool that is managing the results of the query.

- `query` is the query index within the query pool where the result is stored.

- `index` is the query type specific index.

The command completes the query in `queryPool` identified by `query` and `index`, and marks it as available.

The `vkCmdEndQueryIndexedEXT` command operates the same as the vkCmdEndQuery command, except that it also accepts a query type specific `index` parameter.

This command defines an execution dependency between other query commands that reference the same query index.

The first synchronization scope includes all commands which reference the queries in `queryPool` indicated by `query` that occur earlier in submission order.

The second synchronization scope includes only the operation of this command.

Valid Usage

- VUID-vkCmdEndQueryIndexedEXT-None-02342
  All queries used by the command must be active

- VUID-vkCmdEndQueryIndexedEXT-query-02343
  `query` must be less than the number of queries in `queryPool`

- VUID-vkCmdEndQueryIndexedEXT-commandBuffer-02344
  `commandBuffer` must not be a protected command buffer

- VUID-vkCmdEndQueryIndexedEXT-query-02345
  If `vkCmdEndQueryIndexedEXT` is called within a render pass instance, the sum of `query` and the number of bits set in the current subpass’s view mask must be less than or equal to the number of queries in `queryPool`

- VUID-vkCmdEndQueryIndexedEXT-queryType-06694
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_TRANSFORM_FEEDBACK_STREAM_EXT` or `VK_QUERY_TYPE_PRIMITIVES_GENERATED_EXT`, the `index` parameter must be less than `VkPhysicalDeviceTransformFeedbackPropertiesEXT`::`maxTransformFeedbackStreams`

- VUID-vkCmdEndQueryIndexedEXT-queryType-06695
  If the `queryType` used to create `queryPool` was not `VK_QUERY_TYPE_TRANSFORM_FEEDBACK_STREAM_EXT` and not `VK_QUERY_TYPE_PRIMITIVES_GENERATED_EXT`, the `index` must be zero

- VUID-vkCmdEndQueryIndexedEXT-queryType-06696
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_TRANSFORM_FEEDBACK_STREAM_EXT` or `VK_QUERY_TYPE_PRIMITIVES_GENERATED_EXT`, `index` must equal the `index` used to begin the query

- VUID-vkCmdEndQueryIndexedEXT-None-07007
  If called within a subpass of a render pass instance, the corresponding `vkCmdBeginQuery`* command must have been called previously within the same subpass

Valid Usage (Implicit)

- VUID-vkCmdEndQueryIndexedEXT-commandBuffer-parameter
  `commandBuffer` must be a valid VkCommandBuffer handle

- VUID-vkCmdEndQueryIndexedEXT-queryPool-parameter
  `queryPool` must be a valid VkQueryPool handle

- VUID-vkCmdEndQueryIndexedEXT-commandBuffer-recording
  `commandBuffer` must be in the recording state

- VUID-vkCmdEndQueryIndexedEXT-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support graphics, compute, decode, or encode operations

- VUID-vkCmdEndQueryIndexedEXT-videocoding
  This command must only be called outside of a video coding scope

- VUID-vkCmdEndQueryIndexedEXT-commonparent
  Both of `commandBuffer`, and `queryPool` must have been created, allocated, or retrieved from the same VkDevice

Host Synchronization

- Host access to `commandBuffer` must be externally synchronized

- Host access to the `VkCommandPool` that `commandBuffer` was allocated from must be externally synchronized

Command Properties

Command Buffer Levels | Render Pass Scope | Video Coding Scope | Supported Queue Types | Command Type
--- | --- | --- | --- | ---
Primary Secondary | Both | Outside | Graphics Compute Decode Encode | Action State

An application can retrieve results either by requesting they be written into application-provided memory, or by requesting they be copied into a `VkBuffer`. In either case, the layout in memory is defined as follows:

- The first query’s result is written starting at the first byte requested by the command, and each subsequent query’s result begins `stride` bytes later.

- Occlusion queries, pipeline statistics queries, transform feedback queries, primitives generated queries, mesh shader queries, video encode feedback queries, and timestamp queries store results in a tightly packed array of unsigned integers, either 32- or 64-bits as requested by the command, storing the numerical results and, if requested, the availability status.

- Performance queries store results in a tightly packed array whose type is determined by the `unit` member of the corresponding VkPerformanceCounterKHR.

- If `VK_QUERY_RESULT_WITH_AVAILABILITY_BIT` is used, the final element of each query’s result is an integer indicating whether the query’s result is available, with any non-zero value indicating that it is available.

- If `VK_QUERY_RESULT_WITH_STATUS_BIT_KHR` is used, the final element of each query’s result is an integer value indicating that status of the query result. Positive values indicate success, negative values indicate failure, and 0 indicates that the result is not yet available. Specific error codes are encoded in the VkQueryResultStatusKHR enumeration.

- Occlusion queries write one integer value - the number of samples passed. Pipeline statistics queries write one integer value for each bit that is enabled in the `pipelineStatistics` when the pool is created, and the statistics values are written in bit order starting from the least significant bit. Timestamp queries write one integer value. Performance queries write one VkPerformanceCounterResultKHR value for each VkPerformanceCounterKHR in the query. Transform feedback queries write two integers; the first integer is the number of primitives successfully written to the corresponding transform feedback buffer and the second is the number of primitives output to the vertex stream, regardless of whether they were successfully captured or not. In other words, if the transform feedback buffer was sized too small for the number of primitives output by the vertex stream, the first integer represents the number of primitives actually written and the second is the number that would have been written if all the transform feedback buffers associated with that vertex stream were large enough. Primitives generated queries write the number of primitives output to the vertex stream, regardless of whether transform feedback is active or not, or whether they were successfully captured by transform feedback or not. This is identical to the second integer of the transform feedback queries if transform feedback is active. Mesh shader queries write a single integer. Video encode feedback queries write one or more integer values for each bit that is enabled in VkQueryPoolVideoEncodeFeedbackCreateInfoKHR::`encodeFeedbackFlags` when the pool is created, and the feedback values are written in bit order starting from the least significant bit, as described here.

- If more than one query is retrieved and `stride` is not at least as large as the size of the array of values corresponding to a single query, the values written to memory are undefined.

To retrieve status and results for a set of queries, call:

    // Provided by VK_VERSION_1_0
    VkResult vkGetQueryPoolResults(
        VkDevice                                    device,
        VkQueryPool                                 queryPool,
        uint32_t                                    firstQuery,
        uint32_t                                    queryCount,
        size_t                                      dataSize,
        void*                                       pData,
        VkDeviceSize                                stride,
        VkQueryResultFlags                          flags);

- `device` is the logical device that owns the query pool.

- `queryPool` is the query pool managing the queries containing the desired results.

- `firstQuery` is the initial query index.

- `queryCount` is the number of queries to read.

- `dataSize` is the size in bytes of the buffer pointed to by `pData`.

- `pData` is a pointer to an application-allocated buffer where the results will be written

- `stride` is the stride in bytes between results for individual queries within `pData`.

- `flags` is a bitmask of VkQueryResultFlagBits specifying how and when results are returned.

Any results written for a query are written according to a layout dependent on the query type.

If no bits are set in `flags`, and all requested queries are in the available state, results are written as an array of 32-bit unsigned integer values. Behavior when not all queries are available is described below.

If `VK_QUERY_RESULT_WITH_AVAILABILITY_BIT` is set, results for all queries in `queryPool` identified by `firstQuery` and `queryCount` are copied to `pData`, along with an extra availability or status value written directly after the results of each query and interpreted as an unsigned integer. A value of zero indicates that the results are not yet available, otherwise the query is complete and results are available. The size of the availability or status values is 64 bits if `VK_QUERY_RESULT_64_BIT` is set in `flags`. Otherwise, it is 32 bits.

If `VK_QUERY_RESULT_WITH_STATUS_BIT_KHR` is set, results for all queries in `queryPool` identified by `firstQuery` and `queryCount` are copied to `pData`, along with an extra status value written directly after the results of each query and interpreted as a signed integer. A value of zero indicates that the results are not yet available. Positive values indicate that the operations within the query completed successfully, and the query results are valid. Negative values indicate that the operations within the query completed unsuccessfully.

VkQueryResultStatusKHR defines specific meaning for values returned here, though implementations are free to return other values.

If the status value written is negative, indicating that the operations within the query completed unsuccessfully, then all other results written by this command are undefined unless otherwise specified for any of the results of the used query type.

Note | If `VK_QUERY_RESULT_WITH_AVAILABILITY_BIT` or `VK_QUERY_RESULT_WITH_STATUS_BIT_KHR` is set, the layout of data in the buffer is a (result,availability) or (result,status) pair for each query returned, and `stride` is the stride between each pair.

Results for any available query written by this command are final and represent the final result of the query. If `VK_QUERY_RESULT_PARTIAL_BIT` is set, then for any query that is unavailable, an intermediate result between zero and the final result value is written for that query. Otherwise, any result written by this command is undefined.

If `VK_QUERY_RESULT_64_BIT` is set, results and, if returned, availability or status values for all queries are written as an array of 64-bit values. If the `queryPool` was created with `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR`, results for each query are written as an array of the type indicated by VkPerformanceCounterKHR::`storage` for the counter being queried. Otherwise, results and availability or status values are written as an array of 32-bit values. If an unsigned integer query’s value overflows the result type, the value may either wrap or saturate. If the `maintenance7` feature is enabled, for an unsigned integer query, the 32-bit result value must be equal to the 32 least significant bits of the equivalent 64-bit result value. If a signed integer query’s value overflows the result type, the value is undefined. If a floating-point query’s value is not representable as the result type, the value is undefined.

If `VK_QUERY_RESULT_WAIT_BIT` is set, this command defines an execution dependency with any earlier commands that writes one of the identified queries. The first synchronization scope includes all instances of vkCmdEndQuery, vkCmdEndQueryIndexedEXT, vkCmdWriteTimestamp2, and vkCmdWriteTimestamp that reference any query in `queryPool` indicated by `firstQuery` and `queryCount`. The second synchronization scope includes the host operations of this command.

If `VK_QUERY_RESULT_WAIT_BIT` is not set, `vkGetQueryPoolResults` may return `VK_NOT_READY` if there are queries in the unavailable state.

Note | Applications must take care to ensure that use of the `VK_QUERY_RESULT_WAIT_BIT` bit has the desired effect. For example, if a query has been used previously and a command buffer records the commands `vkCmdResetQueryPool`, `vkCmdBeginQuery`, and `vkCmdEndQuery` for that query, then the query will remain in the available state until `vkResetQueryPool` is called or the `vkCmdResetQueryPool` command executes on a queue. Applications can use fences or events to ensure that a query has already been reset before checking for its results or availability status. Otherwise, a stale value could be returned from a previous use of the query. The above also applies when `VK_QUERY_RESULT_WAIT_BIT` is used in combination with `VK_QUERY_RESULT_WITH_AVAILABILITY_BIT`. In this case, the returned availability status may reflect the result of a previous use of the query unless `vkResetQueryPool` is called or the `vkCmdResetQueryPool` command has been executed since the last use of the query. A similar situation can arise with the `VK_QUERY_RESULT_WITH_STATUS_BIT_KHR` flag.

Note | Applications can double-buffer query pool usage, with a pool per frame, and reset queries at the end of the frame in which they are read.

Valid Usage

- VUID-vkGetQueryPoolResults-firstQuery-09436
  `firstQuery` must be less than the number of queries in `queryPool`

- VUID-vkGetQueryPoolResults-firstQuery-09437
  The sum of `firstQuery` and `queryCount` must be less than or equal to the number of queries in `queryPool`

- VUID-vkGetQueryPoolResults-queryCount-09438
  If `queryCount` is greater than 1, `stride` must not be zero

- VUID-vkGetQueryPoolResults-queryType-09439
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_TIMESTAMP`, `flags` must not contain `VK_QUERY_RESULT_PARTIAL_BIT`

- VUID-vkGetQueryPoolResults-queryType-09440
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR`, `flags` must not contain `VK_QUERY_RESULT_WITH_AVAILABILITY_BIT`, `VK_QUERY_RESULT_WITH_STATUS_BIT_KHR`, `VK_QUERY_RESULT_PARTIAL_BIT`, or `VK_QUERY_RESULT_64_BIT`

- VUID-vkGetQueryPoolResults-queryType-09441
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR`, the `queryPool` must have been recorded once for each pass as retrieved via a call to vkGetPhysicalDeviceQueueFamilyPerformanceQueryPassesKHR

- VUID-vkGetQueryPoolResults-queryType-09442
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_RESULT_STATUS_ONLY_KHR`, then `flags` must include `VK_QUERY_RESULT_WITH_STATUS_BIT_KHR`

- VUID-vkGetQueryPoolResults-flags-09443
  If `flags` includes `VK_QUERY_RESULT_WITH_STATUS_BIT_KHR`, then it must not include `VK_QUERY_RESULT_WITH_AVAILABILITY_BIT`

- VUID-vkGetQueryPoolResults-None-09401
  All queries used by the command must not be uninitialized

- VUID-vkGetQueryPoolResults-flags-02828
  If `VK_QUERY_RESULT_64_BIT` is not set in `flags` and the `queryType` used to create `queryPool` was not `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR`, then `pData` and `stride` must be multiples of `4`

- VUID-vkGetQueryPoolResults-flags-00815
  If `VK_QUERY_RESULT_64_BIT` is set in `flags` then `pData` and `stride` must be multiples of `8`

- VUID-vkGetQueryPoolResults-stride-08993
  If `VK_QUERY_RESULT_WITH_AVAILABILITY_BIT` is set, `stride` must be large enough to contain the unsigned integer representing availability or status in addition to the query result

- VUID-vkGetQueryPoolResults-queryType-03229
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR`, then `pData` and `stride` must be multiples of the size of VkPerformanceCounterResultKHR

- VUID-vkGetQueryPoolResults-queryType-04519
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR`, then `stride` must be large enough to contain the VkQueryPoolPerformanceCreateInfoKHR::`counterIndexCount` used to create `queryPool` times the size of VkPerformanceCounterResultKHR

- VUID-vkGetQueryPoolResults-dataSize-00817
  `dataSize` must be large enough to contain the result of each query, as described here

Valid Usage (Implicit)

- VUID-vkGetQueryPoolResults-device-parameter
  `device` must be a valid VkDevice handle

- VUID-vkGetQueryPoolResults-queryPool-parameter
  `queryPool` must be a valid VkQueryPool handle

- VUID-vkGetQueryPoolResults-pData-parameter
  `pData` must be a valid pointer to an array of `dataSize` bytes

- VUID-vkGetQueryPoolResults-flags-parameter
  `flags` must be a valid combination of VkQueryResultFlagBits values

- VUID-vkGetQueryPoolResults-dataSize-arraylength
  `dataSize` must be greater than `0`

- VUID-vkGetQueryPoolResults-queryPool-parent
  `queryPool` must have been created, allocated, or retrieved from `device`

Return Codes

Success

  - `VK_SUCCESS`

  - `VK_NOT_READY`

Failure

  - `VK_ERROR_OUT_OF_HOST_MEMORY`

  - `VK_ERROR_OUT_OF_DEVICE_MEMORY`

  - `VK_ERROR_DEVICE_LOST`

Bits which can be set in vkGetQueryPoolResults::`flags` and vkCmdCopyQueryPoolResults::`flags`, specifying how and when results are returned, are:

    // Provided by VK_VERSION_1_0
    typedef enum VkQueryResultFlagBits {
        VK_QUERY_RESULT_64_BIT = 0x00000001,
        VK_QUERY_RESULT_WAIT_BIT = 0x00000002,
        VK_QUERY_RESULT_WITH_AVAILABILITY_BIT = 0x00000004,
        VK_QUERY_RESULT_PARTIAL_BIT = 0x00000008,
      // Provided by VK_KHR_video_queue
        VK_QUERY_RESULT_WITH_STATUS_BIT_KHR = 0x00000010,
    } VkQueryResultFlagBits;

- `VK_QUERY_RESULT_64_BIT` specifies the results will be written as an array of 64-bit unsigned integer values. If this bit is not set, the results will be written as an array of 32-bit unsigned integer values.

- `VK_QUERY_RESULT_WAIT_BIT` specifies that Vulkan will wait for each query’s status to become available before retrieving its results.

- `VK_QUERY_RESULT_WITH_AVAILABILITY_BIT` specifies that the availability status accompanies the results.

- `VK_QUERY_RESULT_PARTIAL_BIT` specifies that returning partial results is acceptable.

- `VK_QUERY_RESULT_WITH_STATUS_BIT_KHR` specifies that the last value returned in the query is a VkQueryResultStatusKHR value. See result status query for information on how an application can determine whether the use of this flag bit is supported.

    // Provided by VK_VERSION_1_0
    typedef VkFlags VkQueryResultFlags;

`VkQueryResultFlags` is a bitmask type for setting a mask of zero or more VkQueryResultFlagBits.

Specific status codes that can be returned from a query are:

    // Provided by VK_KHR_video_queue
    typedef enum VkQueryResultStatusKHR {
        VK_QUERY_RESULT_STATUS_ERROR_KHR = -1,
        VK_QUERY_RESULT_STATUS_NOT_READY_KHR = 0,
        VK_QUERY_RESULT_STATUS_COMPLETE_KHR = 1,
      // Provided by VK_KHR_video_encode_queue
        VK_QUERY_RESULT_STATUS_INSUFFICIENT_BITSTREAM_BUFFER_RANGE_KHR = -1000299000,
    } VkQueryResultStatusKHR;

- `VK_QUERY_RESULT_STATUS_NOT_READY_KHR` specifies that the query result is not yet available.

- `VK_QUERY_RESULT_STATUS_ERROR_KHR` specifies that operations did not complete successfully.

- `VK_QUERY_RESULT_STATUS_COMPLETE_KHR` specifies that operations completed successfully and the query result is available.

- `VK_QUERY_RESULT_STATUS_INSUFFICIENT_BITSTREAM_BUFFER_RANGE_KHR` specifies that a video encode operation did not complete successfully due to the destination video bitstream buffer range not being sufficiently large to fit the encoded bitstream data.

To copy query statuses and numerical results directly to buffer memory, call:

    // Provided by VK_VERSION_1_0
    void vkCmdCopyQueryPoolResults(
        VkCommandBuffer                             commandBuffer,
        VkQueryPool                                 queryPool,
        uint32_t                                    firstQuery,
        uint32_t                                    queryCount,
        VkBuffer                                    dstBuffer,
        VkDeviceSize                                dstOffset,
        VkDeviceSize                                stride,
        VkQueryResultFlags                          flags);

- `commandBuffer` is the command buffer into which this command will be recorded.

- `queryPool` is the query pool managing the queries containing the desired results.

- `firstQuery` is the initial query index.

- `queryCount` is the number of queries. `firstQuery` and `queryCount` together define a range of queries.

- `dstBuffer` is a VkBuffer object that will receive the results of the copy command.

- `dstOffset` is an offset into `dstBuffer`.

- `stride` is the stride in bytes between results for individual queries within `dstBuffer`. The required size of the backing memory for `dstBuffer` is determined as described above for vkGetQueryPoolResults.

- `flags` is a bitmask of VkQueryResultFlagBits specifying how and when results are returned.

Any results written for a query are written according to a layout dependent on the query type.

Results for any query in `queryPool` identified by `firstQuery` and `queryCount` that is available are copied to `dstBuffer`.

If `VK_QUERY_RESULT_WITH_AVAILABILITY_BIT` is set, results for all queries in `queryPool` identified by `firstQuery` and `queryCount` are copied to `dstBuffer`, along with an extra availability value written directly after the results of each query and interpreted as an unsigned integer. A value of zero indicates that the results are not yet available, otherwise the query is complete and results are available.

If `VK_QUERY_RESULT_WITH_STATUS_BIT_KHR` is set, results for all queries in `queryPool` identified by `firstQuery` and `queryCount` are copied to `dstBuffer`, along with an extra status value written directly after the results of each query and interpreted as a signed integer. A value of zero indicates that the results are not yet available. Positive values indicate that the operations within the query completed successfully, and the query results are valid. Negative values indicate that the operations within the query completed unsuccessfully.

VkQueryResultStatusKHR defines specific meaning for values returned here, though implementations are free to return other values.

If the status value written is negative, indicating that the operations within the query completed unsuccessfully, then all other results written by this command are undefined unless otherwise specified for any of the results of the used query type.

Results for any available query written by this command are final and represent the final result of the query. If `VK_QUERY_RESULT_PARTIAL_BIT` is set, then for any query that is unavailable, an intermediate result between zero and the final result value is written for that query. Otherwise, any result written by this command is undefined.

If `VK_QUERY_RESULT_64_BIT` is set, results and availability or status values for all queries are written as an array of 64-bit values. If the `queryPool` was created with `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR`, results for each query are written as an array of the type indicated by VkPerformanceCounterKHR::`storage` for the counter being queried. Otherwise, results and availability or status values are written as an array of 32-bit values. If an unsigned integer query’s value overflows the result type, the value may either wrap or saturate. If the `maintenance7` feature is enabled, for an unsigned integer query, the 32-bit result value must be equal to the 32 least significant bits of the equivalent 64-bit result value. If a signed integer query’s value overflows the result type, the value is undefined. If a floating-point query’s value is not representable as the result type, the value is undefined.

This command defines an execution dependency between other query commands that reference the same query.

The first synchronization scope includes all commands which reference the queries in `queryPool` indicated by `query` that occur earlier in submission order. If `flags` does not include `VK_QUERY_RESULT_WAIT_BIT`, vkCmdEndQueryIndexedEXT, vkCmdWriteTimestamp2, vkCmdEndQuery, and vkCmdWriteTimestamp are excluded from this scope.

The second synchronization scope includes all commands which reference the queries in `queryPool` indicated by `query` that occur later in submission order.

The operation of this command happens after the first scope and happens before the second scope.

`vkCmdCopyQueryPoolResults` is considered to be a transfer operation, and its writes to buffer memory must be synchronized using `VK_PIPELINE_STAGE_TRANSFER_BIT` and `VK_ACCESS_TRANSFER_WRITE_BIT` before using the results.

Valid Usage

- VUID-vkCmdCopyQueryPoolResults-firstQuery-09436
  `firstQuery` must be less than the number of queries in `queryPool`

- VUID-vkCmdCopyQueryPoolResults-firstQuery-09437
  The sum of `firstQuery` and `queryCount` must be less than or equal to the number of queries in `queryPool`

- VUID-vkCmdCopyQueryPoolResults-queryCount-09438
  If `queryCount` is greater than 1, `stride` must not be zero

- VUID-vkCmdCopyQueryPoolResults-queryType-09439
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_TIMESTAMP`, `flags` must not contain `VK_QUERY_RESULT_PARTIAL_BIT`

- VUID-vkCmdCopyQueryPoolResults-queryType-09440
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR`, `flags` must not contain `VK_QUERY_RESULT_WITH_AVAILABILITY_BIT`, `VK_QUERY_RESULT_WITH_STATUS_BIT_KHR`, `VK_QUERY_RESULT_PARTIAL_BIT`, or `VK_QUERY_RESULT_64_BIT`

- VUID-vkCmdCopyQueryPoolResults-queryType-09441
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR`, the `queryPool` must have been recorded once for each pass as retrieved via a call to vkGetPhysicalDeviceQueueFamilyPerformanceQueryPassesKHR

- VUID-vkCmdCopyQueryPoolResults-queryType-09442
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_RESULT_STATUS_ONLY_KHR`, then `flags` must include `VK_QUERY_RESULT_WITH_STATUS_BIT_KHR`

- VUID-vkCmdCopyQueryPoolResults-flags-09443
  If `flags` includes `VK_QUERY_RESULT_WITH_STATUS_BIT_KHR`, then it must not include `VK_QUERY_RESULT_WITH_AVAILABILITY_BIT`

- VUID-vkCmdCopyQueryPoolResults-None-09402
  All queries used by the command must not be uninitialized when the command is executed

- VUID-vkCmdCopyQueryPoolResults-dstOffset-00819
  `dstOffset` must be less than the size of `dstBuffer`

- VUID-vkCmdCopyQueryPoolResults-flags-00822
  If `VK_QUERY_RESULT_64_BIT` is not set in `flags` then `dstOffset` and `stride` must be multiples of `4`

- VUID-vkCmdCopyQueryPoolResults-flags-00823
  If `VK_QUERY_RESULT_64_BIT` is set in `flags` then `dstOffset` and `stride` must be multiples of `8`

- VUID-vkCmdCopyQueryPoolResults-dstBuffer-00824
  `dstBuffer` must have enough storage, from `dstOffset`, to contain the result of each query, as described here

- VUID-vkCmdCopyQueryPoolResults-dstBuffer-00825
  `dstBuffer` must have been created with `VK_BUFFER_USAGE_TRANSFER_DST_BIT` usage flag

- VUID-vkCmdCopyQueryPoolResults-dstBuffer-00826
  If `dstBuffer` is non-sparse then it must be bound completely and contiguously to a single `VkDeviceMemory` object

- VUID-vkCmdCopyQueryPoolResults-queryType-03232
  If the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_PERFORMANCE_QUERY_KHR`, VkPhysicalDevicePerformanceQueryPropertiesKHR::`allowCommandBufferQueryCopies` must be `VK_TRUE`

- VUID-vkCmdCopyQueryPoolResults-queryType-02734
  vkCmdCopyQueryPoolResults must not be called if the `queryType` used to create `queryPool` was `VK_QUERY_TYPE_PERFORMANCE_QUERY_INTEL`

- VUID-vkCmdCopyQueryPoolResults-None-07429
  All queries used by the command must not be active

- VUID-vkCmdCopyQueryPoolResults-None-08752
  All queries used by the command must have been made available by prior executed commands

Valid Usage (Implicit)

- VUID-vkCmdCopyQueryPoolResults-commandBuffer-parameter
  `commandBuffer` must be a valid VkCommandBuffer handle

- VUID-vkCmdCopyQueryPoolResults-queryPool-parameter
  `queryPool` must be a valid VkQueryPool handle

- VUID-vkCmdCopyQueryPoolResults-dstBuffer-parameter
  `dstBuffer` must be a valid VkBuffer handle

- VUID-vkCmdCopyQueryPoolResults-flags-parameter
  `flags` must be a valid combination of VkQueryResultFlagBits values

- VUID-vkCmdCopyQueryPoolResults-commandBuffer-recording
  `commandBuffer` must be in the recording state

- VUID-vkCmdCopyQueryPoolResults-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support graphics, or compute operations

- VUID-vkCmdCopyQueryPoolResults-renderpass
  This command must only be called outside of a render pass instance

- VUID-vkCmdCopyQueryPoolResults-videocoding
  This command must only be called outside of a video coding scope

- VUID-vkCmdCopyQueryPoolResults-commonparent
  Each of `commandBuffer`, `dstBuffer`, and `queryPool` must have been created, allocated, or retrieved from the same VkDevice

Host Synchronization

- Host access to `commandBuffer` must be externally synchronized

- Host access to the `VkCommandPool` that `commandBuffer` was allocated from must be externally synchronized

Command Properties

Command Buffer Levels | Render Pass Scope | Video Coding Scope | Supported Queue Types | Command Type
--- | --- | --- | --- | ---
Primary Secondary | Outside | Outside | Graphics Compute | Action

Rendering operations such as clears, MSAA resolves, attachment load/store operations, and blits may count towards the results of queries. This behavior is implementation-dependent and may vary depending on the path used within an implementation. For example, some implementations have several types of clears, some of which may include vertices and some not.

### 18.3. Occlusion Queries

Occlusion queries track the number of samples that pass the per-fragment tests for a set of drawing commands. As such, occlusion queries are only available on queue families supporting graphics operations. The application can then use these results to inform future rendering decisions. An occlusion query is begun and ended by calling `vkCmdBeginQuery` and `vkCmdEndQuery`, respectively. When an occlusion query begins, the count of passing samples always starts at zero. For each drawing command, the count is incremented as described in Sample Counting. If `flags` does not contain `VK_QUERY_CONTROL_PRECISE_BIT` an implementation may generate any non-zero result value for the query if the count of passing samples is non-zero.

Note | Not setting `VK_QUERY_CONTROL_PRECISE_BIT` mode may be more efficient on some implementations, and should be used where it is sufficient to know a boolean result on whether any samples passed the per-fragment tests. In this case, some implementations may only return zero or one, indifferent to the actual number of samples passing the per-fragment tests. Setting `VK_QUERY_CONTROL_PRECISE_BIT` does not guarantee that different implementations return the same number of samples in an occlusion query. Some implementations may kill fragments in the pre-rasterization shader stage, and these killed fragments do not contribute to the final result of the query. It is possible that some implementations generate a zero result value for the query, while others generate a non-zero value.

When an occlusion query finishes, the result for that query is marked as available. The application can then either copy the result to a buffer (via `vkCmdCopyQueryPoolResults`) or request it be put into host memory (via `vkGetQueryPoolResults`).

Note | If occluding geometry is not drawn first, samples can pass the depth test, but still not be visible in a final image.

### 18.4. Pipeline Statistics Queries

Pipeline statistics queries allow the application to sample a specified set of `VkPipeline` counters. These counters are accumulated by Vulkan for a set of either drawing or dispatching commands while a pipeline statistics query is active. As such, pipeline statistics queries are available on queue families supporting either graphics or compute operations. The availability of pipeline statistics queries is indicated by the `pipelineStatisticsQuery` member of the `VkPhysicalDeviceFeatures` object (see `vkGetPhysicalDeviceFeatures` and `vkCreateDevice` for detecting and requesting this query type on a `VkDevice`).

A pipeline statistics query is begun and ended by calling `vkCmdBeginQuery` and `vkCmdEndQuery`, respectively. When a pipeline statistics query begins, all statistics counters are set to zero. While the query is active, the pipeline type determines which set of statistics are available, but these must be configured on the query pool when it is created. If a statistic counter is issued on a command buffer that does not support the corresponding operation, or the counter corresponds to a shading stage which is missing from any of the pipelines used while the query is active, the value of that counter is undefined after the query has been made available. At least one statistic counter relevant to the operations supported on the recording command buffer must be enabled.

Bits which can be set in VkQueryPoolCreateInfo::`pipelineStatistics` for query pools and in VkCommandBufferInheritanceInfo::`pipelineStatistics` for secondary command buffers, individually enabling pipeline statistics counters, are:

    // Provided by VK_VERSION_1_0
    typedef enum VkQueryPipelineStatisticFlagBits {
        VK_QUERY_PIPELINE_STATISTIC_INPUT_ASSEMBLY_VERTICES_BIT = 0x00000001,
        VK_QUERY_PIPELINE_STATISTIC_INPUT_ASSEMBLY_PRIMITIVES_BIT = 0x00000002,
        VK_QUERY_PIPELINE_STATISTIC_VERTEX_SHADER_INVOCATIONS_BIT = 0x00000004,
        VK_QUERY_PIPELINE_STATISTIC_GEOMETRY_SHADER_INVOCATIONS_BIT = 0x00000008,
        VK_QUERY_PIPELINE_STATISTIC_GEOMETRY_SHADER_PRIMITIVES_BIT = 0x00000010,
        VK_QUERY_PIPELINE_STATISTIC_CLIPPING_INVOCATIONS_BIT = 0x00000020,
        VK_QUERY_PIPELINE_STATISTIC_CLIPPING_PRIMITIVES_BIT = 0x00000040,
        VK_QUERY_PIPELINE_STATISTIC_FRAGMENT_SHADER_INVOCATIONS_BIT = 0x00000080,
        VK_QUERY_PIPELINE_STATISTIC_TESSELLATION_CONTROL_SHADER_PATCHES_BIT = 0x00000100,
        VK_QUERY_PIPELINE_STATISTIC_TESSELLATION_EVALUATION_SHADER_INVOCATIONS_BIT = 0x00000200,
        VK_QUERY_PIPELINE_STATISTIC_COMPUTE_SHADER_INVOCATIONS_BIT = 0x00000400,
      // Provided by VK_EXT_mesh_shader
        VK_QUERY_PIPELINE_STATISTIC_TASK_SHADER_INVOCATIONS_BIT_EXT = 0x00000800,
      // Provided by VK_EXT_mesh_shader
        VK_QUERY_PIPELINE_STATISTIC_MESH_SHADER_INVOCATIONS_BIT_EXT = 0x00001000,
      // Provided by VK_HUAWEI_cluster_culling_shader
        VK_QUERY_PIPELINE_STATISTIC_CLUSTER_CULLING_SHADER_INVOCATIONS_BIT_HUAWEI = 0x00002000,
    } VkQueryPipelineStatisticFlagBits;

- `VK_QUERY_PIPELINE_STATISTIC_INPUT_ASSEMBLY_VERTICES_BIT` specifies that queries managed by the pool will count the number of vertices processed by the input assembly stage. Vertices corresponding to incomplete primitives may contribute to the count.

- `VK_QUERY_PIPELINE_STATISTIC_INPUT_ASSEMBLY_PRIMITIVES_BIT` specifies that queries managed by the pool will count the number of primitives processed by the input assembly stage. If primitive restart is enabled, restarting the primitive topology has no effect on the count. Incomplete primitives may be counted.

- `VK_QUERY_PIPELINE_STATISTIC_VERTEX_SHADER_INVOCATIONS_BIT` specifies that queries managed by the pool will count the number of vertex shader invocations. This counter’s value is incremented each time a vertex shader is invoked.

- `VK_QUERY_PIPELINE_STATISTIC_GEOMETRY_SHADER_INVOCATIONS_BIT` specifies that queries managed by the pool will count the number of geometry shader invocations. This counter’s value is incremented each time a geometry shader is invoked. In the case of instanced geometry shaders, the geometry shader invocations count is incremented for each separate instanced invocation.

- `VK_QUERY_PIPELINE_STATISTIC_GEOMETRY_SHADER_PRIMITIVES_BIT` specifies that queries managed by the pool will count the number of primitives generated by geometry shader invocations. The counter’s value is incremented each time the geometry shader emits a primitive. Restarting primitive topology using the SPIR-V instructions `OpEndPrimitive` or `OpEndStreamPrimitive` has no effect on the geometry shader output primitives count.

- `VK_QUERY_PIPELINE_STATISTIC_CLIPPING_INVOCATIONS_BIT` specifies that queries managed by the pool will count the number of primitives processed by the Primitive Clipping stage of the pipeline. The counter’s value is incremented each time a primitive reaches the primitive clipping stage.

- `VK_QUERY_PIPELINE_STATISTIC_CLIPPING_PRIMITIVES_BIT` specifies that queries managed by the pool will count the number of primitives output by the Primitive Clipping stage of the pipeline. The counter’s value is incremented each time a primitive passes the primitive clipping stage. The actual number of primitives output by the primitive clipping stage for a particular input primitive is implementation-dependent but must satisfy the following conditions:

  - If at least one vertex of the input primitive lies inside the clipping volume, the counter is incremented by one or more.

  - Otherwise, the counter is incremented by zero or more.

- `VK_QUERY_PIPELINE_STATISTIC_FRAGMENT_SHADER_INVOCATIONS_BIT` specifies that queries managed by the pool will count the number of fragment shader invocations. The counter’s value is incremented each time the fragment shader is invoked.

- `VK_QUERY_PIPELINE_STATISTIC_TESSELLATION_CONTROL_SHADER_PATCHES_BIT` specifies that queries managed by the pool will count the number of patches processed by the tessellation control shader. The counter’s value is incremented once for each patch for which a tessellation control shader is invoked.

- `VK_QUERY_PIPELINE_STATISTIC_TESSELLATION_EVALUATION_SHADER_INVOCATIONS_BIT` specifies that queries managed by the pool will count the number of invocations of the tessellation evaluation shader. The counter’s value is incremented each time the tessellation evaluation shader is invoked.

- `VK_QUERY_PIPELINE_STATISTIC_COMPUTE_SHADER_INVOCATIONS_BIT` specifies that queries managed by the pool will count the number of compute shader invocations. The counter’s value is incremented every time the compute shader is invoked. Implementations may skip the execution of certain compute shader invocations or execute additional compute shader invocations for implementation-dependent reasons as long as the results of rendering otherwise remain unchanged.

- `VK_QUERY_PIPELINE_STATISTIC_TASK_SHADER_INVOCATIONS_BIT_EXT` specifies that queries managed by the pool will count the number of task shader invocations. The counter’s value is incremented every time the task shader is invoked.

- `VK_QUERY_PIPELINE_STATISTIC_MESH_SHADER_INVOCATIONS_BIT_EXT` specifies that queries managed by the pool will count the number of mesh shader invocations. The counter’s value is incremented every time the mesh shader is invoked.

These values are intended to measure relative statistics on one implementation. Various device architectures will count these values differently. Any or all counters may be affected by the issues described in Query Operation.

This counting difference is especially true if the pipeline contains mesh or task shaders, which may affect several of the counters in unexpected ways.

Note | For example, tile-based rendering devices may need to replay the scene multiple times, affecting some of the counts.

If a pipeline has `rasterizerDiscardEnable` enabled, implementations may discard primitives after the final pre-rasterization shader stage. As a result, if `rasterizerDiscardEnable` is enabled, the clipping input and output primitives counters may not be incremented.

When a pipeline statistics query finishes, the result for that query is marked as available. The application can copy the result to a buffer (via `vkCmdCopyQueryPoolResults`), or request it be put into host memory (via `vkGetQueryPoolResults`).

    // Provided by VK_VERSION_1_0
    typedef VkFlags VkQueryPipelineStatisticFlags;

`VkQueryPipelineStatisticFlags` is a bitmask type for setting a mask of zero or more VkQueryPipelineStatisticFlagBits.

### 18.5. Timestamp Queries

Timestamps provide applications with a mechanism for timing the execution of commands. A timestamp is an integer value generated by the `VkPhysicalDevice`. Unlike other queries, timestamps do not operate over a range, and so do not use vkCmdBeginQuery or vkCmdEndQuery. The mechanism is built around a set of commands that allow the application to tell the `VkPhysicalDevice` to write timestamp values to a query pool and then either read timestamp values on the host (using vkGetQueryPoolResults) or copy timestamp values to a `VkBuffer` (using vkCmdCopyQueryPoolResults). The application can then compute differences between timestamps to determine execution time.

The number of valid bits in a timestamp value is determined by the `VkQueueFamilyProperties`::`timestampValidBits` property of the queue on which the timestamp is written. Timestamps are supported on any queue which reports a non-zero value for `timestampValidBits` via vkGetPhysicalDeviceQueueFamilyProperties. If the `timestampComputeAndGraphics` limit is `VK_TRUE`, timestamps are supported by every queue family that supports either graphics or compute operations (see VkQueueFamilyProperties).

The number of nanoseconds it takes for a timestamp value to be incremented by 1 can be obtained from `VkPhysicalDeviceLimits`::`timestampPeriod` after a call to `vkGetPhysicalDeviceProperties`.

To request a timestamp and write the value to memory, call:

    // Provided by VK_VERSION_1_3
    void vkCmdWriteTimestamp2(
        VkCommandBuffer                             commandBuffer,
        VkPipelineStageFlags2                       stage,
        VkQueryPool                                 queryPool,
        uint32_t                                    query);

or the equivalent command

    // Provided by VK_KHR_synchronization2
    void vkCmdWriteTimestamp2KHR(
        VkCommandBuffer                             commandBuffer,
        VkPipelineStageFlags2                       stage,
        VkQueryPool                                 queryPool,
        uint32_t                                    query);

- `commandBuffer` is the command buffer into which the command will be recorded.

- `stage` specifies a stage of the pipeline.

- `queryPool` is the query pool that will manage the timestamp.

- `query` is the query within the query pool that will contain the timestamp.

When `vkCmdWriteTimestamp2` is submitted to a queue, it defines an execution dependency on commands that were submitted before it, and writes a timestamp to a query pool.

The first synchronization scope includes all commands that occur earlier in submission order. The synchronization scope is limited to operations on the pipeline stage specified by `stage`.

The second synchronization scope includes only the timestamp write operation.

Note | Implementations may write the timestamp at any stage that is logically later than `stage`.

Any timestamp write that happens-after another timestamp write in the same submission must not have a lower value unless its value overflows the maximum supported integer bit width of the query. If `VK_KHR_calibrated_timestamps` or `VK_EXT_calibrated_timestamps` is enabled, this extends to timestamp writes across all submissions on the same logical device: any timestamp write that happens-after another must not have a lower value unless its value overflows the maximum supported integer bit width of the query. Timestamps written by this command must be in the `VK_TIME_DOMAIN_DEVICE_KHR` time domain. If an overflow occurs, the timestamp value must wrap back to zero.

Note | Comparisons between timestamps should be done between timestamps where they are guaranteed to not decrease. For example, subtracting an older timestamp from a newer one to determine the execution time of a sequence of commands is only a reliable measurement if the two timestamp writes were performed in the same submission, or if the writes were performed on the same logical device and `VK_KHR_calibrated_timestamps` or `VK_EXT_calibrated_timestamps` is enabled.

If `vkCmdWriteTimestamp2` is called while executing a render pass instance that has multiview enabled, the timestamp uses N consecutive query indices in the query pool (starting at `query`) where N is the number of bits set in the view mask of the subpass the command is executed in. The resulting query values are determined by an implementation-dependent choice of one of the following behaviors:

- The first query is a timestamp value and (if more than one bit is set in the view mask) zero is written to the remaining queries. If two timestamps are written in the same subpass, the sum of the execution time of all views between those commands is the difference between the first query written by each command.

- All N queries are timestamp values. If two timestamps are written in the same subpass, the sum of the execution time of all views between those commands is the sum of the difference between corresponding queries written by each command. The difference between corresponding queries may be the execution time of a single view.

In either case, the application can sum the differences between all N queries to determine the total execution time.

Valid Usage

- VUID-vkCmdWriteTimestamp2-stage-03929
  If the `geometryShader` feature is not enabled, `stage` must not contain `VK_PIPELINE_STAGE_2_GEOMETRY_SHADER_BIT`

- VUID-vkCmdWriteTimestamp2-stage-03930
  If the `tessellationShader` feature is not enabled, `stage` must not contain `VK_PIPELINE_STAGE_2_TESSELLATION_CONTROL_SHADER_BIT` or `VK_PIPELINE_STAGE_2_TESSELLATION_EVALUATION_SHADER_BIT`

- VUID-vkCmdWriteTimestamp2-stage-03931
  If the `conditionalRendering` feature is not enabled, `stage` must not contain `VK_PIPELINE_STAGE_2_CONDITIONAL_RENDERING_BIT_EXT`

- VUID-vkCmdWriteTimestamp2-stage-03932
  If the `fragmentDensityMap` feature is not enabled, `stage` must not contain `VK_PIPELINE_STAGE_2_FRAGMENT_DENSITY_PROCESS_BIT_EXT`

- VUID-vkCmdWriteTimestamp2-stage-03933
  If the `transformFeedback` feature is not enabled, `stage` must not contain `VK_PIPELINE_STAGE_2_TRANSFORM_FEEDBACK_BIT_EXT`

- VUID-vkCmdWriteTimestamp2-stage-03934
  If the `meshShader` feature is not enabled, `stage` must not contain `VK_PIPELINE_STAGE_2_MESH_SHADER_BIT_EXT`

- VUID-vkCmdWriteTimestamp2-stage-03935
  If the `taskShader` feature is not enabled, `stage` must not contain `VK_PIPELINE_STAGE_2_TASK_SHADER_BIT_EXT`

- VUID-vkCmdWriteTimestamp2-stage-07316
  If neither of the `shadingRateImage` or the `attachmentFragmentShadingRate` features are enabled, `stage` must not contain `VK_PIPELINE_STAGE_2_FRAGMENT_SHADING_RATE_ATTACHMENT_BIT_KHR`

- VUID-vkCmdWriteTimestamp2-stage-04957
  If the `subpassShading` feature is not enabled, `stage` must not contain `VK_PIPELINE_STAGE_2_SUBPASS_SHADER_BIT_HUAWEI`

- VUID-vkCmdWriteTimestamp2-stage-04995
  If the `invocationMask` feature is not enabled, `stage` must not contain `VK_PIPELINE_STAGE_2_INVOCATION_MASK_BIT_HUAWEI`

- VUID-vkCmdWriteTimestamp2-stage-07946
  If neither the VK_NV_ray_tracing extension or the `rayTracingPipeline` feature are enabled, `stage` must not contain `VK_PIPELINE_STAGE_2_RAY_TRACING_SHADER_BIT_KHR`

- VUID-vkCmdWriteTimestamp2-synchronization2-03858
  The `synchronization2` feature must be enabled

- VUID-vkCmdWriteTimestamp2-stage-03859
  `stage` must only include a single pipeline stage

- VUID-vkCmdWriteTimestamp2-stage-03860
  `stage` must only include stages valid for the queue family that was used to create the command pool that `commandBuffer` was allocated from

- VUID-vkCmdWriteTimestamp2-queryPool-03861
  `queryPool` must have been created with a `queryType` of `VK_QUERY_TYPE_TIMESTAMP`

- VUID-vkCmdWriteTimestamp2-timestampValidBits-03863
  The command pool’s queue family must support a non-zero `timestampValidBits`

- VUID-vkCmdWriteTimestamp2-query-04903
  `query` must be less than the number of queries in `queryPool`

- VUID-vkCmdWriteTimestamp2-None-03864
  All queries used by the command must be unavailable

- VUID-vkCmdWriteTimestamp2-query-03865
  If `vkCmdWriteTimestamp2` is called within a render pass instance, the sum of `query` and the number of bits set in the current subpass’s view mask must be less than or equal to the number of queries in `queryPool`

Valid Usage (Implicit)

- VUID-vkCmdWriteTimestamp2-commandBuffer-parameter
  `commandBuffer` must be a valid VkCommandBuffer handle

- VUID-vkCmdWriteTimestamp2-stage-parameter
  `stage` must be a valid combination of VkPipelineStageFlagBits2 values

- VUID-vkCmdWriteTimestamp2-queryPool-parameter
  `queryPool` must be a valid VkQueryPool handle

- VUID-vkCmdWriteTimestamp2-commandBuffer-recording
  `commandBuffer` must be in the recording state

- VUID-vkCmdWriteTimestamp2-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support transfer, graphics, compute, decode, or encode operations

- VUID-vkCmdWriteTimestamp2-commonparent
  Both of `commandBuffer`, and `queryPool` must have been created, allocated, or retrieved from the same VkDevice

Host Synchronization

- Host access to `commandBuffer` must be externally synchronized

- Host access to the `VkCommandPool` that `commandBuffer` was allocated from must be externally synchronized

Command Properties

Command Buffer Levels | Render Pass Scope | Video Coding Scope | Supported Queue Types | Command Type
--- | --- | --- | --- | ---
Primary Secondary | Both | Both | Transfer Graphics Compute Decode Encode | Action

To request a timestamp and write the value to memory, call:

    // Provided by VK_VERSION_1_0
    void vkCmdWriteTimestamp(
        VkCommandBuffer                             commandBuffer,
        VkPipelineStageFlagBits                     pipelineStage,
        VkQueryPool                                 queryPool,
        uint32_t                                    query);

- `commandBuffer` is the command buffer into which the command will be recorded.

- `pipelineStage` is a VkPipelineStageFlagBits value, specifying a stage of the pipeline.

- `queryPool` is the query pool that will manage the timestamp.

- `query` is the query within the query pool that will contain the timestamp.

When `vkCmdWriteTimestamp` is submitted to a queue, it defines an execution dependency on commands that were submitted before it, and writes a timestamp to a query pool.

The first synchronization scope includes all commands that occur earlier in submission order. The synchronization scope is limited to operations on the pipeline stage specified by `pipelineStage`.

The second synchronization scope includes only the timestamp write operation.

Note | Implementations may write the timestamp at any stage that is logically later than `stage`.

Any timestamp write that happens-after another timestamp write in the same submission must not have a lower value unless its value overflows the maximum supported integer bit width of the query. If `VK_KHR_calibrated_timestamps` or `VK_EXT_calibrated_timestamps` is enabled, this extends to timestamp writes across all submissions on the same logical device: any timestamp write that happens-after another must not have a lower value unless its value overflows the maximum supported integer bit width of the query. Timestamps written by this command must be in the `VK_TIME_DOMAIN_DEVICE_KHR` time domain. If an overflow occurs, the timestamp value must wrap back to zero.

Note | Comparisons between timestamps should be done between timestamps where they are guaranteed to not decrease. For example, subtracting an older timestamp from a newer one to determine the execution time of a sequence of commands is only a reliable measurement if the two timestamp writes were performed in the same submission, or if the writes were performed on the same logical device and `VK_KHR_calibrated_timestamps` or `VK_EXT_calibrated_timestamps` is enabled.

If `vkCmdWriteTimestamp` is called while executing a render pass instance that has multiview enabled, the timestamp uses N consecutive query indices in the query pool (starting at `query`) where N is the number of bits set in the view mask of the subpass the command is executed in. The resulting query values are determined by an implementation-dependent choice of one of the following behaviors:

- The first query is a timestamp value and (if more than one bit is set in the view mask) zero is written to the remaining queries. If two timestamps are written in the same subpass, the sum of the execution time of all views between those commands is the difference between the first query written by each command.

- All N queries are timestamp values. If two timestamps are written in the same subpass, the sum of the execution time of all views between those commands is the sum of the difference between corresponding queries written by each command. The difference between corresponding queries may be the execution time of a single view.

In either case, the application can sum the differences between all N queries to determine the total execution time.

Valid Usage

- VUID-vkCmdWriteTimestamp-pipelineStage-04074
  `pipelineStage` must be a valid stage for the queue family that was used to create the command pool that `commandBuffer` was allocated from

- VUID-vkCmdWriteTimestamp-pipelineStage-04075
  If the `geometryShader` feature is not enabled, `pipelineStage` must not be `VK_PIPELINE_STAGE_GEOMETRY_SHADER_BIT`

- VUID-vkCmdWriteTimestamp-pipelineStage-04076
  If the `tessellationShader` feature is not enabled, `pipelineStage` must not be `VK_PIPELINE_STAGE_TESSELLATION_CONTROL_SHADER_BIT` or `VK_PIPELINE_STAGE_TESSELLATION_EVALUATION_SHADER_BIT`

- VUID-vkCmdWriteTimestamp-pipelineStage-04077
  If the `conditionalRendering` feature is not enabled, `pipelineStage` must not be `VK_PIPELINE_STAGE_CONDITIONAL_RENDERING_BIT_EXT`

- VUID-vkCmdWriteTimestamp-pipelineStage-04078
  If the `fragmentDensityMap` feature is not enabled, `pipelineStage` must not be `VK_PIPELINE_STAGE_FRAGMENT_DENSITY_PROCESS_BIT_EXT`

- VUID-vkCmdWriteTimestamp-pipelineStage-04079
  If the `transformFeedback` feature is not enabled, `pipelineStage` must not be `VK_PIPELINE_STAGE_TRANSFORM_FEEDBACK_BIT_EXT`

- VUID-vkCmdWriteTimestamp-pipelineStage-04080
  If the `meshShader` feature is not enabled, `pipelineStage` must not be `VK_PIPELINE_STAGE_MESH_SHADER_BIT_EXT`

- VUID-vkCmdWriteTimestamp-pipelineStage-07077
  If the `taskShader` feature is not enabled, `pipelineStage` must not be `VK_PIPELINE_STAGE_TASK_SHADER_BIT_EXT`

- VUID-vkCmdWriteTimestamp-shadingRateImage-07314
  If neither of the `shadingRateImage` or the `attachmentFragmentShadingRate` features are enabled, `pipelineStage` must not be `VK_PIPELINE_STAGE_FRAGMENT_SHADING_RATE_ATTACHMENT_BIT_KHR`

- VUID-vkCmdWriteTimestamp-synchronization2-06489
  If the `synchronization2` feature is not enabled, `pipelineStage` must not be `VK_PIPELINE_STAGE_NONE`

- VUID-vkCmdWriteTimestamp-rayTracingPipeline-07943
  If neither of the VK_NV_ray_tracing extension or the `rayTracingPipeline` feature are enabled, `pipelineStage` must not be `VK_PIPELINE_STAGE_RAY_TRACING_SHADER_BIT_KHR`

- VUID-vkCmdWriteTimestamp-queryPool-01416
  `queryPool` must have been created with a `queryType` of `VK_QUERY_TYPE_TIMESTAMP`

- VUID-vkCmdWriteTimestamp-timestampValidBits-00829
  The command pool’s queue family must support a non-zero `timestampValidBits`

- VUID-vkCmdWriteTimestamp-query-04904
  `query` must be less than the number of queries in `queryPool`

- VUID-vkCmdWriteTimestamp-None-00830
  All queries used by the command must be unavailable

- VUID-vkCmdWriteTimestamp-query-00831
  If `vkCmdWriteTimestamp` is called within a render pass instance, the sum of `query` and the number of bits set in the current subpass’s view mask must be less than or equal to the number of queries in `queryPool`

Valid Usage (Implicit)

- VUID-vkCmdWriteTimestamp-commandBuffer-parameter
  `commandBuffer` must be a valid VkCommandBuffer handle

- VUID-vkCmdWriteTimestamp-pipelineStage-parameter
  `pipelineStage` must be a valid VkPipelineStageFlagBits value

- VUID-vkCmdWriteTimestamp-queryPool-parameter
  `queryPool` must be a valid VkQueryPool handle

- VUID-vkCmdWriteTimestamp-commandBuffer-recording
  `commandBuffer` must be in the recording state

- VUID-vkCmdWriteTimestamp-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support transfer, graphics, compute, decode, encode, or optical flow operations

- VUID-vkCmdWriteTimestamp-commonparent
  Both of `commandBuffer`, and `queryPool` must have been created, allocated, or retrieved from the same VkDevice

Host Synchronization

- Host access to `commandBuffer` must be externally synchronized

- Host access to the `VkCommandPool` that `commandBuffer` was allocated from must be externally synchronized

Command Properties

Command Buffer Levels | Render Pass Scope | Video Coding Scope | Supported Queue Types | Command Type
--- | --- | --- | --- | ---
Primary Secondary | Both | Both | Transfer Graphics Compute Decode Encode Opticalflow | Action

### 18.6. Performance Queries

Performance queries provide applications with a mechanism for getting performance counter information about the execution of command buffers, render passes, and commands.

Each queue family advertises the performance counters that can be queried on a queue of that family via a call to vkEnumeratePhysicalDeviceQueueFamilyPerformanceQueryCountersKHR. Implementations may limit access to performance counters based on platform requirements or only to specialized drivers for development purposes.

Note | This may include no performance counters being enumerated, or a reduced set. Please refer to platform-specific documentation for guidance on any such restrictions.

Performance queries use the existing vkCmdBeginQuery and vkCmdEndQuery to control what command buffers, render passes, or commands to get performance information for.

Implementations may require multiple passes where the command buffer, render passes, or commands being recorded are the same and are executed on the same queue to record performance counter data. This is achieved by submitting the same batch and providing a VkPerformanceQuerySubmitInfoKHR structure containing a counter pass index. The number of passes required for a given performance query pool can be queried via a call to vkGetPhysicalDeviceQueueFamilyPerformanceQueryPassesKHR.

Note | Command buffers created with `VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT` must not be re-submitted. Changing command buffer usage bits may affect performance. To avoid this, the application should re-record any command buffers with the `VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT` when multiple counter passes are required.

Performance counter results from a performance query pool can be obtained with the command vkGetQueryPoolResults.

The `VkPerformanceCounterResultKHR` union is defined as:

    // Provided by VK_KHR_performance_query
    typedef union VkPerformanceCounterResultKHR {
        int32_t     int32;
        int64_t     int64;
        uint32_t    uint32;
        uint64_t    uint64;
        float       float32;
        double      float64;
    } VkPerformanceCounterResultKHR;

- `int32` is a 32-bit signed integer value.

- `int64` is a 64-bit signed integer value.

- `uint32` is a 32-bit unsigned integer value.

- `uint64` is a 64-bit unsigned integer value.

- `float32` is a 32-bit floating-point value.

- `float64` is a 64-bit floating-point value.

Performance query results are returned in an array of `VkPerformanceCounterResultKHR` unions containing the data associated with each counter in the query, stored in the same order as the counters supplied in `pCounterIndices` when creating the performance query. VkPerformanceCounterKHR::`storage` specifies how to parse the counter data.

#### 18.6.1. Profiling Lock

To record and submit a command buffer containing a performance query pool the profiling lock must be held. The profiling lock must be acquired prior to any call to vkBeginCommandBuffer that will be using a performance query pool. The profiling lock must be held while any command buffer containing a performance query pool is in the recording, executable, or pending state. To acquire the profiling lock, call:

    // Provided by VK_KHR_performance_query
    VkResult vkAcquireProfilingLockKHR(
        VkDevice                                    device,
        const VkAcquireProfilingLockInfoKHR*        pInfo);

- `device` is the logical device to profile.

- `pInfo` is a pointer to a `VkAcquireProfilingLockInfoKHR` structure containing information about how the profiling is to be acquired.

Implementations may allow multiple actors to hold the profiling lock concurrently.

Valid Usage (Implicit)

- VUID-vkAcquireProfilingLockKHR-device-parameter
  `device` must be a valid VkDevice handle

- VUID-vkAcquireProfilingLockKHR-pInfo-parameter
  `pInfo` must be a valid pointer to a valid VkAcquireProfilingLockInfoKHR structure

Return Codes

Success

  - `VK_SUCCESS`

Failure

  - `VK_ERROR_OUT_OF_HOST_MEMORY`

  - `VK_TIMEOUT`

The `VkAcquireProfilingLockInfoKHR` structure is defined as:

    // Provided by VK_KHR_performance_query
    typedef struct VkAcquireProfilingLockInfoKHR {
        VkStructureType                   sType;
        const void*                       pNext;
        VkAcquireProfilingLockFlagsKHR    flags;
        uint64_t                          timeout;
    } VkAcquireProfilingLockInfoKHR;

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `flags` is reserved for future use.

- `timeout` indicates how long the function waits, in nanoseconds, if the profiling lock is not available.

Valid Usage (Implicit)

- VUID-VkAcquireProfilingLockInfoKHR-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_ACQUIRE_PROFILING_LOCK_INFO_KHR`

- VUID-VkAcquireProfilingLockInfoKHR-pNext-pNext
  `pNext` must be `NULL`

- VUID-VkAcquireProfilingLockInfoKHR-flags-zerobitmask
  `flags` must be `0`

If `timeout` is 0, `vkAcquireProfilingLockKHR` will not block while attempting to acquire the profiling lock. If `timeout` is `UINT64_MAX`, the function will not return until the profiling lock was acquired.

    // Provided by VK_KHR_performance_query
    typedef enum VkAcquireProfilingLockFlagBitsKHR {
    } VkAcquireProfilingLockFlagBitsKHR;

    // Provided by VK_KHR_performance_query
    typedef VkFlags VkAcquireProfilingLockFlagsKHR;

VkAcquireProfilingLockFlagsKHR is a bitmask type for setting a mask, but is currently reserved for future use.

To release the profiling lock, call:

    // Provided by VK_KHR_performance_query
    void vkReleaseProfilingLockKHR(
        VkDevice                                    device);

- `device` is the logical device to cease profiling on.

Valid Usage

- VUID-vkReleaseProfilingLockKHR-device-03235
  The profiling lock of `device` must have been held via a previous successful call to vkAcquireProfilingLockKHR

Valid Usage (Implicit)

- VUID-vkReleaseProfilingLockKHR-device-parameter
  `device` must be a valid VkDevice handle

### 18.7. Transform Feedback Queries

Transform feedback queries track the number of primitives attempted to be written and actually written, by the vertex stream being captured, to a transform feedback buffer. This query is updated during drawing commands while transform feedback is active. The number of primitives actually written will be less than the number attempted to be written if the bound transform feedback buffer size was too small for the number of primitives actually drawn. Primitives are not written beyond the bound range of the transform feedback buffer. A transform feedback query is begun and ended by calling `vkCmdBeginQuery` and `vkCmdEndQuery`, respectively to query for vertex stream zero. `vkCmdBeginQueryIndexedEXT` and `vkCmdEndQueryIndexedEXT` can be used to begin and end transform feedback queries for any supported vertex stream. When a transform feedback query begins, the count of primitives written and primitives needed starts from zero. For each drawing command, the count is incremented as vertex attribute outputs are captured to the transform feedback buffers while transform feedback is active.

When a transform feedback query finishes, the result for that query is marked as available. The application can then either copy the result to a buffer (via `vkCmdCopyQueryPoolResults`) or request it be put into host memory (via `vkGetQueryPoolResults`).

### 18.8. Primitives Generated Queries

When a generated primitive query for a vertex stream is active, the primitives-generated count is incremented every time a primitive emitted to that stream reaches the transform feedback stage, whether or not transform feedback is active. A primitives generated query is begun and ended by calling `vkCmdBeginQuery` and `vkCmdEndQuery`, respectively to query for vertex stream zero. `vkCmdBeginQueryIndexedEXT` and `vkCmdEndQueryIndexedEXT` can be used to begin and end primitives generated queries for any supported vertex stream. When a primitives generated query begins, the count of primitives generated starts from zero.

When a primitives generated query finishes, the result for that query is marked as available. The application can then either copy the result to a buffer (via `vkCmdCopyQueryPoolResults`) or request it be put into host memory (via `vkGetQueryPoolResults`).

Note | The result of this query is typically identical to `VK_QUERY_PIPELINE_STATISTIC_CLIPPING_INVOCATIONS_BIT`, but the primitives generated query is deterministic, i.e. it must be identical to the number of primitives processed. `VK_QUERY_PIPELINE_STATISTIC_CLIPPING_INVOCATIONS_BIT` may vary for implementation-dependent reasons, e.g. the same primitive may be processed multiple times for purposes of clipping.

### 18.9. Mesh Shader Queries

When a generated mesh primitives query is active, the mesh-primitives-generated count is incremented every time a primitive emitted from the mesh shader stage reaches the fragment shader stage. When a generated mesh primitives query begins, the mesh-primitives-generated count starts from zero.

Mesh and task shader pipeline statistics queries function the same way that invocation queries work for other shader stages, counting the number of times the respective shader stage has been run. When the statistics query begins, the invocation counters start from zero.

### 18.10. Intel Performance Queries

Intel performance queries allow an application to capture performance data for a set of commands. Performance queries are used in a similar way than other types of queries. A main difference with existing queries is that the resulting data should be handed over to a library capable to produce human readable results rather than being read directly by an application.

Prior to creating a performance query pool, initialize the device for performance queries with the call:

    // Provided by VK_INTEL_performance_query
    VkResult vkInitializePerformanceApiINTEL(
        VkDevice                                    device,
        const VkInitializePerformanceApiInfoINTEL*  pInitializeInfo);

- `device` is the logical device used for the queries.

- `pInitializeInfo` is a pointer to a VkInitializePerformanceApiInfoINTEL structure specifying initialization parameters.

Valid Usage (Implicit)

- VUID-vkInitializePerformanceApiINTEL-device-parameter
  `device` must be a valid VkDevice handle

- VUID-vkInitializePerformanceApiINTEL-pInitializeInfo-parameter
  `pInitializeInfo` must be a valid pointer to a valid VkInitializePerformanceApiInfoINTEL structure

Return Codes

Success

  - `VK_SUCCESS`

Failure

  - `VK_ERROR_TOO_MANY_OBJECTS`

  - `VK_ERROR_OUT_OF_HOST_MEMORY`

The `VkInitializePerformanceApiInfoINTEL` structure is defined as :

    // Provided by VK_INTEL_performance_query
    typedef struct VkInitializePerformanceApiInfoINTEL {
        VkStructureType    sType;
        const void*        pNext;
        void*              pUserData;
    } VkInitializePerformanceApiInfoINTEL;

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `pUserData` is a pointer for application data.

Valid Usage (Implicit)

- VUID-VkInitializePerformanceApiInfoINTEL-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_INITIALIZE_PERFORMANCE_API_INFO_INTEL`

- VUID-VkInitializePerformanceApiInfoINTEL-pNext-pNext
  `pNext` must be `NULL`

Once performance query operations have completed, uninitialize the device for performance queries with the call:

    // Provided by VK_INTEL_performance_query
    void vkUninitializePerformanceApiINTEL(
        VkDevice                                    device);

- `device` is the logical device used for the queries.

Valid Usage (Implicit)

- VUID-vkUninitializePerformanceApiINTEL-device-parameter
  `device` must be a valid VkDevice handle

Some performance query features of a device can be discovered with the call:

    // Provided by VK_INTEL_performance_query
    VkResult vkGetPerformanceParameterINTEL(
        VkDevice                                    device,
        VkPerformanceParameterTypeINTEL             parameter,
        VkPerformanceValueINTEL*                    pValue);

- `device` is the logical device to query.

- `parameter` is the parameter to query.

- `pValue` is a pointer to a VkPerformanceValueINTEL structure in which the type and value of the parameter are returned.

Valid Usage (Implicit)

- VUID-vkGetPerformanceParameterINTEL-device-parameter
  `device` must be a valid VkDevice handle

- VUID-vkGetPerformanceParameterINTEL-parameter-parameter
  `parameter` must be a valid VkPerformanceParameterTypeINTEL value

- VUID-vkGetPerformanceParameterINTEL-pValue-parameter
  `pValue` must be a valid pointer to a VkPerformanceValueINTEL structure

Return Codes

Success

  - `VK_SUCCESS`

Failure

  - `VK_ERROR_TOO_MANY_OBJECTS`

  - `VK_ERROR_OUT_OF_HOST_MEMORY`

Possible values of vkGetPerformanceParameterINTEL::`parameter`, specifying a performance query feature, are:

    // Provided by VK_INTEL_performance_query
    typedef enum VkPerformanceParameterTypeINTEL {
        VK_PERFORMANCE_PARAMETER_TYPE_HW_COUNTERS_SUPPORTED_INTEL = 0,
        VK_PERFORMANCE_PARAMETER_TYPE_STREAM_MARKER_VALID_BITS_INTEL = 1,
    } VkPerformanceParameterTypeINTEL;

- `VK_PERFORMANCE_PARAMETER_TYPE_HW_COUNTERS_SUPPORTED_INTEL` has a boolean result which tells whether hardware counters can be captured.

- `VK_PERFORMANCE_PARAMETER_TYPE_STREAM_MARKER_VALID_BITS_INTEL` has a 32 bits integer result which tells how many bits can be written into the `VkPerformanceValueINTEL` value.

The `VkPerformanceValueINTEL` structure is defined as:

    // Provided by VK_INTEL_performance_query
    typedef struct VkPerformanceValueINTEL {
        VkPerformanceValueTypeINTEL    type;
        VkPerformanceValueDataINTEL    data;
    } VkPerformanceValueINTEL;

- `type` is a VkPerformanceValueTypeINTEL value specifying the type of the returned data.

- `data` is a VkPerformanceValueDataINTEL union specifying the value of the returned data.

Possible values of VkPerformanceValueINTEL::`type`, specifying the type of the data returned in VkPerformanceValueINTEL::`data`, are:

- `VK_PERFORMANCE_VALUE_TYPE_UINT32_INTEL` specifies that unsigned 32-bit integer data is returned in `data.value32`.

- `VK_PERFORMANCE_VALUE_TYPE_UINT64_INTEL` specifies that unsigned 64-bit integer data is returned in `data.value64`.

- `VK_PERFORMANCE_VALUE_TYPE_FLOAT_INTEL` specifies that floating-point data is returned in `data.valueFloat`.

- `VK_PERFORMANCE_VALUE_TYPE_BOOL_INTEL` specifies that VkBool32 data is returned in `data.valueBool`.

- `VK_PERFORMANCE_VALUE_TYPE_STRING_INTEL` specifies that a pointer to a null-terminated UTF-8 string is returned in `data.valueString`. The pointer is valid for the lifetime of the `device` parameter passed to vkGetPerformanceParameterINTEL.

    // Provided by VK_INTEL_performance_query
    typedef enum VkPerformanceValueTypeINTEL {
        VK_PERFORMANCE_VALUE_TYPE_UINT32_INTEL = 0,
        VK_PERFORMANCE_VALUE_TYPE_UINT64_INTEL = 1,
        VK_PERFORMANCE_VALUE_TYPE_FLOAT_INTEL = 2,
        VK_PERFORMANCE_VALUE_TYPE_BOOL_INTEL = 3,
        VK_PERFORMANCE_VALUE_TYPE_STRING_INTEL = 4,
    } VkPerformanceValueTypeINTEL;

The `VkPerformanceValueDataINTEL` union is defined as:

    // Provided by VK_INTEL_performance_query
    typedef union VkPerformanceValueDataINTEL {
        uint32_t       value32;
        uint64_t       value64;
        float          valueFloat;
        VkBool32       valueBool;
        const char*    valueString;
    } VkPerformanceValueDataINTEL;

- `data.value32` represents 32-bit integer data.

- `data.value64` represents 64-bit integer data.

- `data.valueFloat` represents floating-point data.

- `data.valueBool` represents VkBool32 data.

- `data.valueString` represents a pointer to a null-terminated UTF-8 string.

The correct member of the union is determined by the associated VkPerformanceValueTypeINTEL value.

The `VkQueryPoolPerformanceQueryCreateInfoINTEL` structure is defined as:

    // Provided by VK_INTEL_performance_query
    typedef struct VkQueryPoolPerformanceQueryCreateInfoINTEL {
        VkStructureType                 sType;
        const void*                     pNext;
        VkQueryPoolSamplingModeINTEL    performanceCountersSampling;
    } VkQueryPoolPerformanceQueryCreateInfoINTEL;

    // Provided by VK_INTEL_performance_query
    typedef VkQueryPoolPerformanceQueryCreateInfoINTEL VkQueryPoolCreateInfoINTEL;

To create a pool for Intel performance queries, set VkQueryPoolCreateInfo::`queryType` to `VK_QUERY_TYPE_PERFORMANCE_QUERY_INTEL` and add a `VkQueryPoolPerformanceQueryCreateInfoINTEL` structure to the `pNext` chain of the VkQueryPoolCreateInfo structure.

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `performanceCountersSampling` describe how performance queries should be captured.

Valid Usage (Implicit)

- VUID-VkQueryPoolPerformanceQueryCreateInfoINTEL-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_QUERY_POOL_PERFORMANCE_QUERY_CREATE_INFO_INTEL`

- VUID-VkQueryPoolPerformanceQueryCreateInfoINTEL-performanceCountersSampling-parameter
  `performanceCountersSampling` must be a valid VkQueryPoolSamplingModeINTEL value

Possible values of VkQueryPoolPerformanceQueryCreateInfoINTEL::`performanceCountersSampling` are:

    // Provided by VK_INTEL_performance_query
    typedef enum VkQueryPoolSamplingModeINTEL {
        VK_QUERY_POOL_SAMPLING_MODE_MANUAL_INTEL = 0,
    } VkQueryPoolSamplingModeINTEL;

- `VK_QUERY_POOL_SAMPLING_MODE_MANUAL_INTEL` is the default mode in which the application calls vkCmdBeginQuery and vkCmdEndQuery to record performance data.

To help associate query results with a particular point at which an application emitted commands, markers can be set into the command buffers with the call:

    // Provided by VK_INTEL_performance_query
    VkResult vkCmdSetPerformanceMarkerINTEL(
        VkCommandBuffer                             commandBuffer,
        const VkPerformanceMarkerInfoINTEL*         pMarkerInfo);

The last marker set onto a command buffer before the end of a query will be part of the query result.

Valid Usage (Implicit)

- VUID-vkCmdSetPerformanceMarkerINTEL-commandBuffer-parameter
  `commandBuffer` must be a valid VkCommandBuffer handle

- VUID-vkCmdSetPerformanceMarkerINTEL-pMarkerInfo-parameter
  `pMarkerInfo` must be a valid pointer to a valid VkPerformanceMarkerInfoINTEL structure

- VUID-vkCmdSetPerformanceMarkerINTEL-commandBuffer-recording
  `commandBuffer` must be in the recording state

- VUID-vkCmdSetPerformanceMarkerINTEL-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support graphics, compute, or transfer operations

- VUID-vkCmdSetPerformanceMarkerINTEL-videocoding
  This command must only be called outside of a video coding scope

Host Synchronization

- Host access to `commandBuffer` must be externally synchronized

- Host access to the `VkCommandPool` that `commandBuffer` was allocated from must be externally synchronized

Command Properties

Command Buffer Levels | Render Pass Scope | Video Coding Scope | Supported Queue Types | Command Type
--- | --- | --- | --- | ---
Primary Secondary | Both | Outside | Graphics Compute Transfer | Action State

Return Codes

Success

  - `VK_SUCCESS`

Failure

  - `VK_ERROR_TOO_MANY_OBJECTS`

  - `VK_ERROR_OUT_OF_HOST_MEMORY`

The `VkPerformanceMarkerInfoINTEL` structure is defined as:

    // Provided by VK_INTEL_performance_query
    typedef struct VkPerformanceMarkerInfoINTEL {
        VkStructureType    sType;
        const void*        pNext;
        uint64_t           marker;
    } VkPerformanceMarkerInfoINTEL;

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `marker` is the marker value that will be recorded into the opaque query results.

Valid Usage (Implicit)

- VUID-VkPerformanceMarkerInfoINTEL-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_PERFORMANCE_MARKER_INFO_INTEL`

- VUID-VkPerformanceMarkerInfoINTEL-pNext-pNext
  `pNext` must be `NULL`

When monitoring the behavior of an application within the dataset generated by the entire set of applications running on the system, it is useful to identify draw calls within a potentially huge amount of performance data. To do so, application can generate stream markers that will be used to trace back a particular draw call with a particular performance data item.

    // Provided by VK_INTEL_performance_query
    VkResult vkCmdSetPerformanceStreamMarkerINTEL(
        VkCommandBuffer                             commandBuffer,
        const VkPerformanceStreamMarkerInfoINTEL*   pMarkerInfo);

- `commandBuffer` is a VkCommandBuffer into which a stream marker is added.

- `pMarkerInfo` is a pointer to a VkPerformanceStreamMarkerInfoINTEL structure describing the marker to insert.

Valid Usage (Implicit)

- VUID-vkCmdSetPerformanceStreamMarkerINTEL-commandBuffer-parameter
  `commandBuffer` must be a valid VkCommandBuffer handle

- VUID-vkCmdSetPerformanceStreamMarkerINTEL-pMarkerInfo-parameter
  `pMarkerInfo` must be a valid pointer to a valid VkPerformanceStreamMarkerInfoINTEL structure

- VUID-vkCmdSetPerformanceStreamMarkerINTEL-commandBuffer-recording
  `commandBuffer` must be in the recording state

- VUID-vkCmdSetPerformanceStreamMarkerINTEL-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support graphics, compute, or transfer operations

- VUID-vkCmdSetPerformanceStreamMarkerINTEL-videocoding
  This command must only be called outside of a video coding scope

Host Synchronization

- Host access to `commandBuffer` must be externally synchronized

- Host access to the `VkCommandPool` that `commandBuffer` was allocated from must be externally synchronized

Command Properties

Command Buffer Levels | Render Pass Scope | Video Coding Scope | Supported Queue Types | Command Type
--- | --- | --- | --- | ---
Primary Secondary | Both | Outside | Graphics Compute Transfer | Action State

Return Codes

Success

  - `VK_SUCCESS`

Failure

  - `VK_ERROR_TOO_MANY_OBJECTS`

  - `VK_ERROR_OUT_OF_HOST_MEMORY`

The `VkPerformanceStreamMarkerInfoINTEL` structure is defined as:

    // Provided by VK_INTEL_performance_query
    typedef struct VkPerformanceStreamMarkerInfoINTEL {
        VkStructureType    sType;
        const void*        pNext;
        uint32_t           marker;
    } VkPerformanceStreamMarkerInfoINTEL;

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `marker` is the marker value that will be recorded into the reports consumed by an external application.

Valid Usage

- VUID-VkPerformanceStreamMarkerInfoINTEL-marker-02735
  The value written by the application into `marker` must only used the valid bits as reported by vkGetPerformanceParameterINTEL with the `VK_PERFORMANCE_PARAMETER_TYPE_STREAM_MARKER_VALID_BITS_INTEL`

Valid Usage (Implicit)

- VUID-VkPerformanceStreamMarkerInfoINTEL-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_PERFORMANCE_STREAM_MARKER_INFO_INTEL`

- VUID-VkPerformanceStreamMarkerInfoINTEL-pNext-pNext
  `pNext` must be `NULL`

Some applications might want measure the effect of a set of commands with a different settings. It is possible to override a particular settings using :

    // Provided by VK_INTEL_performance_query
    VkResult vkCmdSetPerformanceOverrideINTEL(
        VkCommandBuffer                             commandBuffer,
        const VkPerformanceOverrideInfoINTEL*       pOverrideInfo);

- `commandBuffer` is the command buffer where the override takes place.

- `pOverrideInfo` is a pointer to a VkPerformanceOverrideInfoINTEL structure selecting the parameter to override.

Valid Usage

- VUID-vkCmdSetPerformanceOverrideINTEL-pOverrideInfo-02736
  `pOverrideInfo` must not be used with a VkPerformanceOverrideTypeINTEL that is not reported available by `vkGetPerformanceParameterINTEL`

Valid Usage (Implicit)

- VUID-vkCmdSetPerformanceOverrideINTEL-commandBuffer-parameter
  `commandBuffer` must be a valid VkCommandBuffer handle

- VUID-vkCmdSetPerformanceOverrideINTEL-pOverrideInfo-parameter
  `pOverrideInfo` must be a valid pointer to a valid VkPerformanceOverrideInfoINTEL structure

- VUID-vkCmdSetPerformanceOverrideINTEL-commandBuffer-recording
  `commandBuffer` must be in the recording state

- VUID-vkCmdSetPerformanceOverrideINTEL-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support graphics, compute, or transfer operations

- VUID-vkCmdSetPerformanceOverrideINTEL-videocoding
  This command must only be called outside of a video coding scope

Host Synchronization

- Host access to `commandBuffer` must be externally synchronized

- Host access to the `VkCommandPool` that `commandBuffer` was allocated from must be externally synchronized

Command Properties

Command Buffer Levels | Render Pass Scope | Video Coding Scope | Supported Queue Types | Command Type
--- | --- | --- | --- | ---
Primary Secondary | Both | Outside | Graphics Compute Transfer | State

Return Codes

Success

  - `VK_SUCCESS`

Failure

  - `VK_ERROR_TOO_MANY_OBJECTS`

  - `VK_ERROR_OUT_OF_HOST_MEMORY`

The `VkPerformanceOverrideInfoINTEL` structure is defined as:

    // Provided by VK_INTEL_performance_query
    typedef struct VkPerformanceOverrideInfoINTEL {
        VkStructureType                   sType;
        const void*                       pNext;
        VkPerformanceOverrideTypeINTEL    type;
        VkBool32                          enable;
        uint64_t                          parameter;
    } VkPerformanceOverrideInfoINTEL;

- `type` is the particular VkPerformanceOverrideTypeINTEL to set.

- `enable` defines whether the override is enabled.

- `parameter` is a potential required parameter for the override.

Valid Usage (Implicit)

- VUID-VkPerformanceOverrideInfoINTEL-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_PERFORMANCE_OVERRIDE_INFO_INTEL`

- VUID-VkPerformanceOverrideInfoINTEL-pNext-pNext
  `pNext` must be `NULL`

- VUID-VkPerformanceOverrideInfoINTEL-type-parameter
  `type` must be a valid VkPerformanceOverrideTypeINTEL value

Possible values of VkPerformanceOverrideInfoINTEL::`type`, specifying performance override types, are:

    // Provided by VK_INTEL_performance_query
    typedef enum VkPerformanceOverrideTypeINTEL {
        VK_PERFORMANCE_OVERRIDE_TYPE_NULL_HARDWARE_INTEL = 0,
        VK_PERFORMANCE_OVERRIDE_TYPE_FLUSH_GPU_CACHES_INTEL = 1,
    } VkPerformanceOverrideTypeINTEL;

- `VK_PERFORMANCE_OVERRIDE_TYPE_NULL_HARDWARE_INTEL` turns all rendering operations into noop.

- `VK_PERFORMANCE_OVERRIDE_TYPE_FLUSH_GPU_CACHES_INTEL` stalls the stream of commands until all previously emitted commands have completed and all caches been flushed and invalidated.

Before submitting command buffers containing performance queries commands to a device queue, the application must acquire and set a performance query configuration. The configuration can be released once all command buffers containing performance query commands are not in a pending state.

    // Provided by VK_INTEL_performance_query
    VK_DEFINE_NON_DISPATCHABLE_HANDLE(VkPerformanceConfigurationINTEL)

To acquire a device performance configuration, call:

    // Provided by VK_INTEL_performance_query
    VkResult vkAcquirePerformanceConfigurationINTEL(
        VkDevice                                    device,
        const VkPerformanceConfigurationAcquireInfoINTEL* pAcquireInfo,
        VkPerformanceConfigurationINTEL*            pConfiguration);

- `device` is the logical device that the performance query commands will be submitted to.

- `pAcquireInfo` is a pointer to a VkPerformanceConfigurationAcquireInfoINTEL structure, specifying the performance configuration to acquire.

- `pConfiguration` is a pointer to a `VkPerformanceConfigurationINTEL` handle in which the resulting configuration object is returned.

Valid Usage (Implicit)

- VUID-vkAcquirePerformanceConfigurationINTEL-device-parameter
  `device` must be a valid VkDevice handle

- VUID-vkAcquirePerformanceConfigurationINTEL-pAcquireInfo-parameter
  `pAcquireInfo` must be a valid pointer to a valid VkPerformanceConfigurationAcquireInfoINTEL structure

- VUID-vkAcquirePerformanceConfigurationINTEL-pConfiguration-parameter
  `pConfiguration` must be a valid pointer to a VkPerformanceConfigurationINTEL handle

Return Codes

Success

  - `VK_SUCCESS`

Failure

  - `VK_ERROR_TOO_MANY_OBJECTS`

  - `VK_ERROR_OUT_OF_HOST_MEMORY`

The `VkPerformanceConfigurationAcquireInfoINTEL` structure is defined as:

    // Provided by VK_INTEL_performance_query
    typedef struct VkPerformanceConfigurationAcquireInfoINTEL {
        VkStructureType                        sType;
        const void*                            pNext;
        VkPerformanceConfigurationTypeINTEL    type;
    } VkPerformanceConfigurationAcquireInfoINTEL;

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `type` is one of the VkPerformanceConfigurationTypeINTEL type of performance configuration that will be acquired.

Valid Usage (Implicit)

- VUID-VkPerformanceConfigurationAcquireInfoINTEL-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_PERFORMANCE_CONFIGURATION_ACQUIRE_INFO_INTEL`

- VUID-VkPerformanceConfigurationAcquireInfoINTEL-pNext-pNext
  `pNext` must be `NULL`

- VUID-VkPerformanceConfigurationAcquireInfoINTEL-type-parameter
  `type` must be a valid VkPerformanceConfigurationTypeINTEL value

Possible values of VkPerformanceConfigurationAcquireInfoINTEL::`type`, specifying performance configuration types, are:

    // Provided by VK_INTEL_performance_query
    typedef enum VkPerformanceConfigurationTypeINTEL {
        VK_PERFORMANCE_CONFIGURATION_TYPE_COMMAND_QUEUE_METRICS_DISCOVERY_ACTIVATED_INTEL = 0,
    } VkPerformanceConfigurationTypeINTEL;

To set a performance configuration, call:

    // Provided by VK_INTEL_performance_query
    VkResult vkQueueSetPerformanceConfigurationINTEL(
        VkQueue                                     queue,
        VkPerformanceConfigurationINTEL             configuration);

- `queue` is the queue on which the configuration will be used.

- `configuration` is the configuration to use.

Valid Usage (Implicit)

- VUID-vkQueueSetPerformanceConfigurationINTEL-queue-parameter
  `queue` must be a valid VkQueue handle

- VUID-vkQueueSetPerformanceConfigurationINTEL-configuration-parameter
  `configuration` must be a valid VkPerformanceConfigurationINTEL handle

- VUID-vkQueueSetPerformanceConfigurationINTEL-commonparent
  Both of `configuration`, and `queue` must have been created, allocated, or retrieved from the same VkDevice

Command Properties

Command Buffer Levels | Render Pass Scope | Video Coding Scope | Supported Queue Types | Command Type
--- | --- | --- | --- | ---
- | - | - | Any | -

Return Codes

Success

  - `VK_SUCCESS`

Failure

  - `VK_ERROR_TOO_MANY_OBJECTS`

  - `VK_ERROR_OUT_OF_HOST_MEMORY`

To release a device performance configuration, call:

    // Provided by VK_INTEL_performance_query
    VkResult vkReleasePerformanceConfigurationINTEL(
        VkDevice                                    device,
        VkPerformanceConfigurationINTEL             configuration);

- `device` is the device associated to the configuration object to release.

- `configuration` is the configuration object to release.

Valid Usage

- VUID-vkReleasePerformanceConfigurationINTEL-configuration-02737
  `configuration` must not be released before all command buffers submitted while the configuration was set are in pending state

Valid Usage (Implicit)

- VUID-vkReleasePerformanceConfigurationINTEL-device-parameter
  `device` must be a valid VkDevice handle

- VUID-vkReleasePerformanceConfigurationINTEL-configuration-parameter
  If `configuration` is not VK_NULL_HANDLE, `configuration` must be a valid VkPerformanceConfigurationINTEL handle

- VUID-vkReleasePerformanceConfigurationINTEL-configuration-parent
  If `configuration` is a valid handle, it must have been created, allocated, or retrieved from `device`

Host Synchronization

- Host access to `configuration` must be externally synchronized

Return Codes

Success

  - `VK_SUCCESS`

Failure

  - `VK_ERROR_TOO_MANY_OBJECTS`

  - `VK_ERROR_OUT_OF_HOST_MEMORY`

### 18.11. Result Status Queries

Result status queries serve a single purpose: allowing the application to determine whether a set of operations have completed successfully or not, as indicated by the VkQueryResultStatusKHR value written when retrieving the result of a query using the `VK_QUERY_RESULT_WITH_STATUS_BIT_KHR` flag.

Unlike other query types, result status queries do not track or maintain any other data beyond the completion status, thus no other data is written when retrieving their results.

Support for result status queries is indicated by VkQueueFamilyQueryResultStatusPropertiesKHR::`queryResultStatusSupport` , as returned by vkGetPhysicalDeviceQueueFamilyProperties2 for the queue family in question.

### 18.12. Video Encode Feedback Queries

Video encode feedback queries allow the application to capture feedback values generated by video encode operations. As such, video encode feedback queries are available on queue families supporting video encode operations. The availability of individual video encode feedback values is indicated by the bits of VkVideoEncodeCapabilitiesKHR::`supportedEncodeFeedbackFlags`, as returned by vkGetPhysicalDeviceVideoCapabilitiesKHR for the video profile the queries are intended to be used with.

The set of enabled video encode feedback values must be configured on the query pool when it is created using the `encodeFeedbackFlags` member of the VkQueryPoolVideoEncodeFeedbackCreateInfoKHR included in the `pNext` chain of VkQueryPoolCreateInfo.

The `VkQueryPoolVideoEncodeFeedbackCreateInfoKHR` structure is defined as:

    // Provided by VK_KHR_video_encode_queue
    typedef struct VkQueryPoolVideoEncodeFeedbackCreateInfoKHR {
        VkStructureType                  sType;
        const void*                      pNext;
        VkVideoEncodeFeedbackFlagsKHR    encodeFeedbackFlags;
    } VkQueryPoolVideoEncodeFeedbackCreateInfoKHR;

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `encodeFeedbackFlags` is a bitmask of VkVideoEncodeFeedbackFlagBitsKHR values specifying the set of enabled video encode feedback values captured by queries of the new pool.

Valid Usage (Implicit)

- VUID-VkQueryPoolVideoEncodeFeedbackCreateInfoKHR-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_QUERY_POOL_VIDEO_ENCODE_FEEDBACK_CREATE_INFO_KHR`

- VUID-VkQueryPoolVideoEncodeFeedbackCreateInfoKHR-encodeFeedbackFlags-parameter
  `encodeFeedbackFlags` must be a valid combination of VkVideoEncodeFeedbackFlagBitsKHR values

- VUID-VkQueryPoolVideoEncodeFeedbackCreateInfoKHR-encodeFeedbackFlags-requiredbitmask
  `encodeFeedbackFlags` must not be `0`

Bits which can be set in VkQueryPoolVideoEncodeFeedbackCreateInfoKHR::`encodeFeedbackFlags` for video encode feedback query pools are:

    // Provided by VK_KHR_video_encode_queue
    typedef enum VkVideoEncodeFeedbackFlagBitsKHR {
        VK_VIDEO_ENCODE_FEEDBACK_BITSTREAM_BUFFER_OFFSET_BIT_KHR = 0x00000001,
        VK_VIDEO_ENCODE_FEEDBACK_BITSTREAM_BYTES_WRITTEN_BIT_KHR = 0x00000002,
        VK_VIDEO_ENCODE_FEEDBACK_BITSTREAM_HAS_OVERRIDES_BIT_KHR = 0x00000004,
    } VkVideoEncodeFeedbackFlagBitsKHR;

- `VK_VIDEO_ENCODE_FEEDBACK_BITSTREAM_BUFFER_OFFSET_BIT_KHR` specifies that queries managed by the pool will capture the byte offset of the bitstream data written by the video encode operation to the bitstream buffer specified in VkVideoEncodeInfoKHR::`dstBuffer` relative to the offset specified in VkVideoEncodeInfoKHR::`dstBufferOffset`. For the first video encode operation issued by any video encode command, this value will always be zero, meaning that bitstream data is always written to the buffer specified in VkVideoEncodeInfoKHR::`dstBuffer` starting from the offset specified in VkVideoEncodeInfoKHR::`dstBufferOffset`.

- `VK_VIDEO_ENCODE_FEEDBACK_BITSTREAM_BYTES_WRITTEN_BIT_KHR` specifies that queries managed by the pool will capture the number of bytes written by the video encode operation to the bitstream buffer specified in VkVideoEncodeInfoKHR::`dstBuffer`.

- `VK_VIDEO_ENCODE_FEEDBACK_BITSTREAM_HAS_OVERRIDES_BIT_KHR` specifies that queries managed by the pool will capture a boolean value indicating that the data written to the bitstream buffer specified in VkVideoEncodeInfoKHR::`dstBuffer` contains overridden parameters.

When retrieving the results of video encode feedback queries, the values corresponding to each enabled video encode feedback are written in the order of the bits defined above, followed by an optional value indicating availability or result status if `VK_QUERY_RESULT_WITH_AVAILABILITY_BIT` or `VK_QUERY_RESULT_WITH_STATUS_BIT_KHR` is specified, respectively.

If the result status of a video encode feedback query is negative, then the results of all enabled video encode feedback values will be undefined.

Note | Applications should always specify `VK_QUERY_RESULT_WITH_STATUS_BIT_KHR` when retrieving the results of video encode feedback queries and ignore such undefined video encode feedback values for any unsuccessfully completed video encode operations.

    // Provided by VK_KHR_video_encode_queue
    typedef VkFlags VkVideoEncodeFeedbackFlagsKHR;

`VkVideoEncodeFeedbackFlagsKHR` is a bitmask type for setting a mask of zero or more VkVideoEncodeFeedbackFlagBitsKHR.