# vkCmdWriteMicromapsPropertiesEXT(3) Manual Page

## Name

vkCmdWriteMicromapsPropertiesEXT - Write micromap result parameters to query results.

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## C Specification

To query micromap size parameters call:

    // Provided by VK_EXT_opacity_micromap
    void vkCmdWriteMicromapsPropertiesEXT(
        VkCommandBuffer                             commandBuffer,
        uint32_t                                    micromapCount,
        const VkMicromapEXT*                        pMicromaps,
        VkQueryType                                 queryType,
        VkQueryPool                                 queryPool,
        uint32_t                                    firstQuery);

## Parameters

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

- `micromapCount` is the count of micromaps for which to query the property.

- `pMicromaps` is a pointer to an array of existing previously built micromaps.

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

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

- `firstQuery` is the first query index within the query pool that will contain the `micromapCount` number of results.

## Description

Accesses to any of the micromaps listed in `pMicromaps` must be synchronized with the `VK_PIPELINE_STAGE_2_MICROMAP_BUILD_BIT_EXT` pipeline stage and an access type of `VK_ACCESS_2_MICROMAP_READ_BIT_EXT`.

- If `queryType` is `VK_QUERY_TYPE_MICROMAP_SERIALIZATION_SIZE_EXT`, then the value written out is the number of bytes required by a serialized micromap.

- If `queryType` is `VK_QUERY_TYPE_MICROMAP_COMPACTED_SIZE_EXT`, then the value written out is the number of bytes required by a compacted micromap.

Valid Usage

- VUID-vkCmdWriteMicromapsPropertiesEXT-queryPool-07525
  `queryPool` must have been created with a `queryType` matching `queryType`

- VUID-vkCmdWriteMicromapsPropertiesEXT-queryPool-07526
  The queries identified by `queryPool` and `firstQuery` must be unavailable

- VUID-vkCmdWriteMicromapsPropertiesEXT-buffer-07527
  The `buffer` used to create each micromap in `pMicrmaps` must be bound to device memory

- VUID-vkCmdWriteMicromapsPropertiesEXT-query-07528
  The sum of `query` plus `micromapCount` must be less than or equal to the number of queries in `queryPool`

- VUID-vkCmdWriteMicromapsPropertiesEXT-pMicromaps-07501
  All micromaps in `pMicromaps` must have been constructed prior to the execution of this command

- VUID-vkCmdWriteMicromapsPropertiesEXT-pMicromaps-07502
  All micromaps in `pMicromaps` must have been constructed with `VK_BUILD_MICROMAP_ALLOW_COMPACTION_BIT_EXT` if `queryType` is `VK_QUERY_TYPE_MICROMAP_COMPACTED_SIZE_EXT`

- VUID-vkCmdWriteMicromapsPropertiesEXT-queryType-07503
  `queryType` must be `VK_QUERY_TYPE_MICROMAP_COMPACTED_SIZE_EXT` or `VK_QUERY_TYPE_MICROMAP_SERIALIZATION_SIZE_EXT`

Valid Usage (Implicit)

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

- VUID-vkCmdWriteMicromapsPropertiesEXT-pMicromaps-parameter
  `pMicromaps` must be a valid pointer to an array of `micromapCount` valid VkMicromapEXT handles

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

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

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

- VUID-vkCmdWriteMicromapsPropertiesEXT-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support compute operations

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

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

- VUID-vkCmdWriteMicromapsPropertiesEXT-micromapCount-arraylength
  `micromapCount` must be greater than `0`

- VUID-vkCmdWriteMicromapsPropertiesEXT-commonparent
  Each of `commandBuffer`, `queryPool`, and the elements of `pMicromaps` 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 | Compute | Action

## See Also

VK_EXT_opacity_micromap, VkCommandBuffer, VkMicromapEXT, VkQueryPool, VkQueryType

## Document Notes

For more information, see the Vulkan Specification

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

## Copyright

Copyright 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0