C Specification

To request a specific device address for a buffer, add a VkBufferDeviceAddressCreateInfoEXT structure to the pNext chain of the VkBufferCreateInfo structure. The VkBufferDeviceAddressCreateInfoEXT structure is defined as:

typedef struct VkBufferDeviceAddressCreateInfoEXT {
    VkStructureType    sType;
    const void*        pNext;
    VkDeviceAddress    deviceAddress;
} VkBufferDeviceAddressCreateInfoEXT;

Members

  • sType is the type of this structure.

  • pNext is NULL or a pointer to an extension-specific structure.

  • deviceAddress is the device address requested for the buffer.

Description

If deviceAddress is zero, no specific address is requested.

If deviceAddress is not zero, deviceAddress must be an address retrieved from an identically created buffer on the same implementation. The buffer must also be bound to an identically created VkDeviceMemory object.

If this structure is not present, it is as if deviceAddress is zero.

Apps should avoid creating buffers with app-provided addresses and implementation-provided addresses in the same process, to reduce the likelihood of VK_ERROR_INVALID_DEVICE_ADDRESS_EXT errors.

Note

The expected usage for this is that a trace capture/replay tool will add the VK_BUFFER_CREATE_DEVICE_ADDRESS_CAPTURE_REPLAY_BIT_EXT flag to all buffers that use VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT_EXT, and during capture will save the queried device addresses in the trace. During replay, the buffers will be created specifying the original address so any address values stored in the trace data will remain valid.

Implementations are expected to separate such buffers in the GPU address space so normal allocations will avoid using these addresses. Apps/tools should avoid mixing app-provided and implementation-provided addresses for buffers created with VK_BUFFER_CREATE_DEVICE_ADDRESS_CAPTURE_REPLAY_BIT_EXT, to avoid address space allocation conflicts.

Valid Usage (Implicit)
  • sType must be VK_STRUCTURE_TYPE_BUFFER_DEVICE_ADDRESS_CREATE_INFO_EXT

See Also

VkDeviceAddress, VkStructureType

Document Notes

For more information, see the Vulkan Specification at URL

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

Copyright (c) 2014-2019 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.