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
- 
commandBufferis the command buffer into which the command will be recorded.
- 
micromapCountis the count of micromaps for which to query the property.
- 
pMicromapsis a pointer to an array of existing previously built micromaps.
- 
queryTypeis a VkQueryType value specifying the type of queries managed by the pool.
- 
queryPoolis the query pool that will manage the results of the query.
- 
firstQueryis the first query index within the query pool that will contain themicromapCountnumber 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 queryTypeisVK_QUERY_TYPE_MICROMAP_SERIALIZATION_SIZE_EXT, then the value written out is the number of bytes required by a serialized micromap.
- 
If queryTypeisVK_QUERY_TYPE_MICROMAP_COMPACTED_SIZE_EXT, then the value written out is the number of bytes required by a compacted micromap.
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.