C Specification
To copy an acceleration structure to device memory call:
// Provided by VK_KHR_ray_tracing
void vkCmdCopyAccelerationStructureToMemoryKHR(
VkCommandBuffer commandBuffer,
const VkCopyAccelerationStructureToMemoryInfoKHR* pInfo);
Parameters
This command produces the same results as vkCopyAccelerationStructureToMemoryKHR, 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 vkCmdCopyMemoryToAccelerationStructureKHR or vkCopyMemoryToAccelerationStructureKHR.
Description
-
commandBuffer
is the command buffer into which the command will be recorded. -
pInfo
is an a pointer to a VkCopyAccelerationStructureToMemoryInfoKHR structure defining the copy operation.
The defined header structure for the serialized data consists of:
-
VK_UUID_SIZE
bytes of data matchingVkPhysicalDeviceIDProperties
::driverUUID
-
VK_UUID_SIZE
bytes of data identifying the compatibility for comparison using vkGetDeviceAccelerationStructureCompatibilityKHR -
A 64-bit integer of the total size matching the value queried using
VK_QUERY_TYPE_ACCELERATION_STRUCTURE_SERIALIZATION_SIZE_KHR
-
A 64-bit integer of the deserialized size to be passed in to
VkAccelerationStructureCreateInfoKHR
::compactedSize
-
A 64-bit integer of the count of the number of acceleration structure handles following. This will be zero for a bottom-level acceleration structure.
The corresponding handles matching the values returned by vkGetAccelerationStructureDeviceAddressKHR or vkGetAccelerationStructureHandleNV are tightly packed in the buffer following the count. The application is expected to store a mapping between those handles and the original application-generated bottom-level acceleration structures to provide when deserializing.
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 (c) 2014-2020 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.