# VK_KHR_device_group(3) Manual Page

## Name

VK_KHR_device_group - device extension

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## Registered Extension Number

61

## Revision

4

## Ratification Status

Ratified

## Extension and Version Dependencies

VK_KHR_device_group_creation

## API Interactions

- Interacts with VK_KHR_bind_memory2

- Interacts with VK_KHR_surface

- Interacts with VK_KHR_swapchain

## SPIR-V Dependencies

- SPV_KHR_device_group

## Deprecation State

- Promoted to Vulkan 1.1

## Contact

- Jeff Bolz [GitHub]jeffbolznv

## Other Extension Metadata

Last Modified Date

  2017-10-10

IP Status

  No known IP claims.

Contributors

  - Jeff Bolz, NVIDIA

  - Tobias Hector, Imagination Technologies

## Description

This extension provides functionality to use a logical device that consists of multiple physical devices, as created with the `VK_KHR_device_group_creation` extension. A device group can allocate memory across the subdevices, bind memory from one subdevice to a resource on another subdevice, record command buffers where some work executes on an arbitrary subset of the subdevices, and potentially present a swapchain image from one or more subdevices.

## Promotion to Vulkan 1.1

The following enums, types and commands are included as interactions with `VK_KHR_swapchain`:

- `VK_STRUCTURE_TYPE_DEVICE_GROUP_PRESENT_CAPABILITIES_KHR`

- `VK_STRUCTURE_TYPE_IMAGE_SWAPCHAIN_CREATE_INFO_KHR`

- `VK_STRUCTURE_TYPE_BIND_IMAGE_MEMORY_SWAPCHAIN_INFO_KHR`

- `VK_STRUCTURE_TYPE_ACQUIRE_NEXT_IMAGE_INFO_KHR`

- `VK_STRUCTURE_TYPE_DEVICE_GROUP_PRESENT_INFO_KHR`

- `VK_STRUCTURE_TYPE_DEVICE_GROUP_SWAPCHAIN_CREATE_INFO_KHR`

- `VK_SWAPCHAIN_CREATE_SPLIT_INSTANCE_BIND_REGIONS_BIT_KHR`

- VkDeviceGroupPresentModeFlagBitsKHR

- VkDeviceGroupPresentCapabilitiesKHR

- VkImageSwapchainCreateInfoKHR

- VkBindImageMemorySwapchainInfoKHR

- VkAcquireNextImageInfoKHR

- VkDeviceGroupPresentInfoKHR

- VkDeviceGroupSwapchainCreateInfoKHR

- vkGetDeviceGroupPresentCapabilitiesKHR

- vkGetDeviceGroupSurfacePresentModesKHR

- vkGetPhysicalDevicePresentRectanglesKHR

- vkAcquireNextImage2KHR

If Vulkan 1.1 and `VK_KHR_swapchain` are supported, these are included by `VK_KHR_swapchain`.

The base functionality in this extension is included in core Vulkan 1.1, with the KHR suffix omitted. The original type, enum, and command names are still available as aliases of the core functionality.

## New Commands

- vkCmdDispatchBaseKHR

- vkCmdSetDeviceMaskKHR

- vkGetDeviceGroupPeerMemoryFeaturesKHR

If VK_KHR_surface is supported:

- vkGetDeviceGroupPresentCapabilitiesKHR

- vkGetDeviceGroupSurfacePresentModesKHR

- vkGetPhysicalDevicePresentRectanglesKHR

If VK_KHR_swapchain is supported:

- vkAcquireNextImage2KHR

## New Structures

- Extending VkBindSparseInfo:

  - VkDeviceGroupBindSparseInfoKHR

- Extending VkCommandBufferBeginInfo:

  - VkDeviceGroupCommandBufferBeginInfoKHR

- Extending VkMemoryAllocateInfo:

  - VkMemoryAllocateFlagsInfoKHR

- Extending VkRenderPassBeginInfo, VkRenderingInfo:

  - VkDeviceGroupRenderPassBeginInfoKHR

- Extending VkSubmitInfo:

  - VkDeviceGroupSubmitInfoKHR

If VK_KHR_bind_memory2 is supported:

- Extending VkBindBufferMemoryInfo:

  - VkBindBufferMemoryDeviceGroupInfoKHR

- Extending VkBindImageMemoryInfo:

  - VkBindImageMemoryDeviceGroupInfoKHR

If VK_KHR_surface is supported:

- VkDeviceGroupPresentCapabilitiesKHR

If VK_KHR_swapchain is supported:

- VkAcquireNextImageInfoKHR

- Extending VkBindImageMemoryInfo:

  - VkBindImageMemorySwapchainInfoKHR

- Extending VkImageCreateInfo:

  - VkImageSwapchainCreateInfoKHR

- Extending VkPresentInfoKHR:

  - VkDeviceGroupPresentInfoKHR

- Extending VkSwapchainCreateInfoKHR:

  - VkDeviceGroupSwapchainCreateInfoKHR

## New Enums

- VkMemoryAllocateFlagBitsKHR

- VkPeerMemoryFeatureFlagBitsKHR

If VK_KHR_surface is supported:

- VkDeviceGroupPresentModeFlagBitsKHR

## New Bitmasks

- VkMemoryAllocateFlagsKHR

- VkPeerMemoryFeatureFlagsKHR

If VK_KHR_surface is supported:

- VkDeviceGroupPresentModeFlagsKHR

## New Enum Constants

- `VK_KHR_DEVICE_GROUP_EXTENSION_NAME`

- `VK_KHR_DEVICE_GROUP_SPEC_VERSION`

- Extending VkDependencyFlagBits:

  - `VK_DEPENDENCY_DEVICE_GROUP_BIT_KHR`

- Extending VkMemoryAllocateFlagBits:

  - `VK_MEMORY_ALLOCATE_DEVICE_MASK_BIT_KHR`

- Extending VkPeerMemoryFeatureFlagBits:

  - `VK_PEER_MEMORY_FEATURE_COPY_DST_BIT_KHR`

  - `VK_PEER_MEMORY_FEATURE_COPY_SRC_BIT_KHR`

  - `VK_PEER_MEMORY_FEATURE_GENERIC_DST_BIT_KHR`

  - `VK_PEER_MEMORY_FEATURE_GENERIC_SRC_BIT_KHR`

- Extending VkPipelineCreateFlagBits:

  - `VK_PIPELINE_CREATE_DISPATCH_BASE_KHR`

  - `VK_PIPELINE_CREATE_VIEW_INDEX_FROM_DEVICE_INDEX_BIT_KHR`

- Extending VkStructureType:

  - `VK_STRUCTURE_TYPE_DEVICE_GROUP_BIND_SPARSE_INFO_KHR`

  - `VK_STRUCTURE_TYPE_DEVICE_GROUP_COMMAND_BUFFER_BEGIN_INFO_KHR`

  - `VK_STRUCTURE_TYPE_DEVICE_GROUP_RENDER_PASS_BEGIN_INFO_KHR`

  - `VK_STRUCTURE_TYPE_DEVICE_GROUP_SUBMIT_INFO_KHR`

  - `VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_FLAGS_INFO_KHR`

If VK_KHR_bind_memory2 is supported:

- Extending VkImageCreateFlagBits:

  - `VK_IMAGE_CREATE_SPLIT_INSTANCE_BIND_REGIONS_BIT_KHR`

- Extending VkStructureType:

  - `VK_STRUCTURE_TYPE_BIND_BUFFER_MEMORY_DEVICE_GROUP_INFO_KHR`

  - `VK_STRUCTURE_TYPE_BIND_IMAGE_MEMORY_DEVICE_GROUP_INFO_KHR`

If VK_KHR_surface is supported:

- Extending VkStructureType:

  - `VK_STRUCTURE_TYPE_DEVICE_GROUP_PRESENT_CAPABILITIES_KHR`

If VK_KHR_swapchain is supported:

- Extending VkStructureType:

  - `VK_STRUCTURE_TYPE_ACQUIRE_NEXT_IMAGE_INFO_KHR`

  - `VK_STRUCTURE_TYPE_BIND_IMAGE_MEMORY_SWAPCHAIN_INFO_KHR`

  - `VK_STRUCTURE_TYPE_DEVICE_GROUP_PRESENT_INFO_KHR`

  - `VK_STRUCTURE_TYPE_DEVICE_GROUP_SWAPCHAIN_CREATE_INFO_KHR`

  - `VK_STRUCTURE_TYPE_IMAGE_SWAPCHAIN_CREATE_INFO_KHR`

- Extending VkSwapchainCreateFlagBitsKHR:

  - `VK_SWAPCHAIN_CREATE_SPLIT_INSTANCE_BIND_REGIONS_BIT_KHR`

## New Built-in Variables

- `DeviceIndex`

## New SPIR-V Capabilities

- `DeviceGroup`

## Version History

- Revision 1, 2016-10-19 (Jeff Bolz)

  - Internal revisions

- Revision 2, 2017-05-19 (Tobias Hector)

  - Removed extended memory bind functions to VK_KHR_bind_memory2, added dependency on that extension, and device-group-specific structs for those functions.

- Revision 3, 2017-10-06 (Ian Elliott)

  - Corrected Vulkan 1.1 interactions with the WSI extensions. All Vulkan 1.1 WSI interactions are with the VK_KHR_swapchain extension.

- Revision 4, 2017-10-10 (Jeff Bolz)

  - Rename “SFR” bits and structure members to use the phrase “split instance bind regions”.

## See Also

No cross-references are available

## Document Notes

For more information, see the Vulkan Specification

This page is a generated document. Fixes and changes should be made to the generator scripts, not directly.

## Copyright

Copyright 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0