To query the 64-bit device address for an acceleration structure, call:
// Provided by VK_KHR_acceleration_structure
const VkAccelerationStructureDeviceAddressInfoKHR* pInfo);
deviceis the logical device that the acceleration structure was created on.
pInfois a pointer to a VkAccelerationStructureDeviceAddressInfoKHR structure specifying the acceleration structure to retrieve an address for.
The 64-bit return value is an address of the acceleration structure, which can be used for device and shader operations that involve acceleration structures, such as ray traversal and acceleration structure building.
If the acceleration structure was created with a non-zero value of
deviceAddress, the return
value will be the same address.
If the acceleration structure was created with a
VK_ACCELERATION_STRUCTURE_TYPE_GENERIC_KHR, the returned address must
be consistent with the relative offset to other acceleration structures with
VK_ACCELERATION_STRUCTURE_TYPE_GENERIC_KHR allocated with
the same VkBuffer.
That is, the difference in returned addresses between the two must be the
same as the difference in offsets provided at acceleration structure
The returned address must be aligned to 256 bytes.
The acceleration structure device address may be different from the buffer
device address corresponding to the acceleration structure’s start offset in
its storage buffer for acceleration structure types other than
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.