## C Specification

To begin an indexed query, call:

void vkCmdBeginQueryIndexedEXT(
VkCommandBuffer                             commandBuffer,
VkQueryPool                                 queryPool,
uint32_t                                    query,
VkQueryControlFlags                         flags,
uint32_t                                    index);

## Parameters

• 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 the index represents the vertex stream.

## Description

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

Valid Usage
• queryPool must have been created with a queryType that differs from that of any queries that are active within commandBuffer

• All queries used by the command must be unavailable

• The queryType used to create queryPool must not be VK_QUERY_TYPE_TIMESTAMP

• If the precise occlusion queries 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

• query must be less than the number of queries in queryPool

• If the queryType used to create queryPool was VK_QUERY_TYPE_OCCLUSION, the VkCommandPool that commandBuffer was allocated from must support graphics operations

• 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

• 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

• commandBuffer must not be a protected command buffer

• 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

• 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

• If the queryType used to create queryPool was VK_QUERY_TYPE_TRANSFORM_FEEDBACK_STREAM_EXT the index parameter must be less than VkPhysicalDeviceTransformFeedbackPropertiesEXT::maxTransformFeedbackStreams

• If the queryType used to create queryPool was not VK_QUERY_TYPE_TRANSFORM_FEEDBACK_STREAM_EXT the index must be zero

• If the queryType used to create queryPool was VK_QUERY_TYPE_TRANSFORM_FEEDBACK_STREAM_EXT then VkPhysicalDeviceTransformFeedbackPropertiesEXT::transformFeedbackQueries must be supported

Valid Usage (Implicit)
• commandBuffer must be a valid VkCommandBuffer handle

• queryPool must be a valid VkQueryPool handle

• flags must be a valid combination of VkQueryControlFlagBits values

• commandBuffer must be in the recording state

• The VkCommandPool that commandBuffer was allocated from must support graphics, or compute operations

• 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 Supported Queue Types Pipeline Type

Primary
Secondary

Both

Graphics
Compute