Function Prototype

vkCmdCopyMicromapToMemoryEXT

Copy a micromap to device memory
primary / secondary
outside
compute
action

To copy a micromap to device memory call:

void vkCmdCopyMicromapToMemoryEXT(
    VkCommandBuffer commandBuffer,
    const VkCopyMicromapToMemoryInfoEXT* pInfo);
  • commandBuffer is the command buffer into which the command will be recorded.
  • pInfo is an a pointer to a VkCopyMicromapToMemoryInfoEXT structure defining the copy operation.

Accesses to pInfo→src 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. Accesses to the buffer indicated by pInfo→dst.deviceAddress must be synchronized with the VK_PIPELINE_STAGE_2_MICROMAP_BUILD_BIT_EXT pipeline stage and an access type of VK_ACCESS_TRANSFER_WRITE_BIT.

This command produces the same results as vkCopyMicromapToMemoryEXT, but writes its result to a device address, and is executed on the device rather than the host. The output may not necessarily be bit-for-bit identical, but it can be equally used by either vkCmdCopyMemoryToMicromapEXT or vkCopyMemoryToMicromapEXT.

The defined header structure for the serialized data consists of:

  • VK_UUID_SIZE bytes of data matching VkPhysicalDeviceIDProperties::driverUUID
  • VK_UUID_SIZE bytes of data identifying the compatibility for comparison using vkGetDeviceMicromapCompatibilityEXT The serialized data is written to the buffer (or read from the buffer) according to the host endianness.

Valid Usage

VUID-vkCmdCopyMicromapToMemoryEXT-pInfo-07536

pInfo→dst.deviceAddress must be a valid device address for a buffer bound to device memory

VUID-vkCmdCopyMicromapToMemoryEXT-pInfo-07537

pInfo→dst.deviceAddress must be aligned to 256 bytes

VUID-vkCmdCopyMicromapToMemoryEXT-pInfo-07538

If the buffer pointed to by pInfo→dst.deviceAddress is non-sparse then it must be bound completely and contiguously to a single VkDeviceMemory object

VUID-vkCmdCopyMicromapToMemoryEXT-buffer-07539

The buffer used to create pInfo→src must be bound to device memory

Valid Usage (Implicit)

VUID-vkCmdCopyMicromapToMemoryEXT-commandBuffer-cmdpool

The VkCommandPool that commandBuffer was allocated from must support compute operations

VUID-vkCmdCopyMicromapToMemoryEXT-renderpass

This command must only be called outside of a render pass instance

VUID-vkCmdCopyMicromapToMemoryEXT-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 ::