C Specification

The VkMicromapCreateInfoEXT structure is defined as:

// Provided by VK_EXT_opacity_micromap
typedef struct VkMicromapCreateInfoEXT {
    VkStructureType             sType;
    const void*                 pNext;
    VkMicromapCreateFlagsEXT    createFlags;
    VkBuffer                    buffer;
    VkDeviceSize                offset;
    VkDeviceSize                size;
    VkMicromapTypeEXT           type;
    VkDeviceAddress             deviceAddress;
} VkMicromapCreateInfoEXT;


  • sType is a VkStructureType value identifying this structure.

  • pNext is NULL or a pointer to a structure extending this structure.

  • createFlags is a bitmask of VkMicromapCreateFlagBitsEXT specifying additional creation parameters of the micromap.

  • buffer is the buffer on which the micromap will be stored.

  • offset is an offset in bytes from the base address of the buffer at which the micromap will be stored, and must be a multiple of 256.

  • size is the size required for the micromap.

  • type is a VkMicromapTypeEXT value specifying the type of micromap that will be created.

  • deviceAddress is the device address requested for the micromap if the micromapCaptureReplay feature is being used.


If deviceAddress is zero, no specific address is requested.

If deviceAddress is not zero, deviceAddress must be an address retrieved from an identically created micromap on the same implementation. The micromap must also be placed on an identically created buffer and at the same offset.

Applications should avoid creating micromaps with application-provided addresses and implementation-provided addresses in the same process, to reduce the likelihood of VK_ERROR_INVALID_OPAQUE_CAPTURE_ADDRESS_KHR errors.


The expected usage for this is that a trace capture/replay tool will add the VK_BUFFER_CREATE_DEVICE_ADDRESS_CAPTURE_REPLAY_BIT flag to all buffers that use VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT, and will add VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT to all buffers used as storage for a micromap where deviceAddress is not zero. This also means that the tool will need to add VK_MEMORY_ALLOCATE_DEVICE_ADDRESS_BIT to memory allocations to allow the flag to be set where the application may not have otherwise required it. During capture the tool will save the queried opaque device addresses in the trace. During replay, the buffers will be created specifying the original address so any address values stored in the trace data will remain valid.

Implementations are expected to separate such buffers in the GPU address space so normal allocations will avoid using these addresses. Apps/tools should avoid mixing app-provided and implementation-provided addresses for buffers created with VK_BUFFER_CREATE_DEVICE_ADDRESS_CAPTURE_REPLAY_BIT, to avoid address space allocation conflicts.

If the micromap will be the target of a build operation, the required size for a micromap can be queried with vkGetMicromapBuildSizesEXT.

Valid Usage
  • VUID-VkMicromapCreateInfoEXT-deviceAddress-07433
    If deviceAddress is not zero, createFlags must include VK_MICROMAP_CREATE_DEVICE_ADDRESS_CAPTURE_REPLAY_BIT_EXT

  • VUID-VkMicromapCreateInfoEXT-createFlags-07434
    If createFlags includes VK_MICROMAP_CREATE_DEVICE_ADDRESS_CAPTURE_REPLAY_BIT_EXT, VkPhysicalDeviceOpacityMicromapFeaturesEXT::micromapCaptureReplay must be VK_TRUE

  • VUID-VkMicromapCreateInfoEXT-buffer-07435
    buffer must have been created with a usage value containing VK_BUFFER_USAGE_MICROMAP_STORAGE_BIT_EXT

  • VUID-VkMicromapCreateInfoEXT-buffer-07436
    buffer must not have been created with VK_BUFFER_CREATE_SPARSE_RESIDENCY_BIT

  • VUID-VkMicromapCreateInfoEXT-offset-07437
    The sum of offset and size must be less than the size of buffer

  • VUID-VkMicromapCreateInfoEXT-offset-07438
    offset must be a multiple of 256 bytes

Valid Usage (Implicit)
  • VUID-VkMicromapCreateInfoEXT-sType-sType

  • VUID-VkMicromapCreateInfoEXT-pNext-pNext
    pNext must be NULL

  • VUID-VkMicromapCreateInfoEXT-createFlags-parameter
    createFlags must be a valid combination of VkMicromapCreateFlagBitsEXT values

  • VUID-VkMicromapCreateInfoEXT-buffer-parameter
    buffer must be a valid VkBuffer handle

  • VUID-VkMicromapCreateInfoEXT-type-parameter
    type must be a valid VkMicromapTypeEXT value

See Also

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 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0