## C Specification

Possible values of mode specifying additional operations to perform during the copy, are:

// Provided by VK_KHR_acceleration_structure
typedef enum VkCopyAccelerationStructureModeKHR {
VK_COPY_ACCELERATION_STRUCTURE_MODE_CLONE_KHR = 0,
VK_COPY_ACCELERATION_STRUCTURE_MODE_COMPACT_KHR = 1,
VK_COPY_ACCELERATION_STRUCTURE_MODE_SERIALIZE_KHR = 2,
VK_COPY_ACCELERATION_STRUCTURE_MODE_DESERIALIZE_KHR = 3,
// Provided by VK_NV_ray_tracing
VK_COPY_ACCELERATION_STRUCTURE_MODE_CLONE_NV = VK_COPY_ACCELERATION_STRUCTURE_MODE_CLONE_KHR,
// Provided by VK_NV_ray_tracing
VK_COPY_ACCELERATION_STRUCTURE_MODE_COMPACT_NV = VK_COPY_ACCELERATION_STRUCTURE_MODE_COMPACT_KHR,
} VkCopyAccelerationStructureModeKHR;

or the equivalent

// Provided by VK_NV_ray_tracing
typedef VkCopyAccelerationStructureModeKHR VkCopyAccelerationStructureModeNV;

## Description

• VK_COPY_ACCELERATION_STRUCTURE_MODE_CLONE_KHR creates a direct copy of the acceleration structure specified in src into the one specified by dst. The dst acceleration structure must have been created with the same parameters as src. If src contains references to other acceleration structures, dst will reference the same acceleration structures.

• VK_COPY_ACCELERATION_STRUCTURE_MODE_COMPACT_KHR creates a more compact version of an acceleration structure src into dst. The acceleration structure dst must have been created with a size at least as large as that returned by vkCmdWriteAccelerationStructuresPropertiesKHR or vkWriteAccelerationStructuresPropertiesKHR after the build of the acceleration structure specified by src. If src contains references to other acceleration structures, dst will reference the same acceleration structures.

• VK_COPY_ACCELERATION_STRUCTURE_MODE_SERIALIZE_KHR serializes the acceleration structure to a semi-opaque format which can be reloaded on a compatible implementation.

• VK_COPY_ACCELERATION_STRUCTURE_MODE_DESERIALIZE_KHR deserializes the semi-opaque serialization format in the buffer to the acceleration structure.