# VkBindBufferMemoryDeviceGroupInfo(3) Manual Page

## Name

VkBindBufferMemoryDeviceGroupInfo - Structure specifying device within a group to bind to

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## C Specification

The `VkBindBufferMemoryDeviceGroupInfo` structure is defined as:

    // Provided by VK_VERSION_1_1
    typedef struct VkBindBufferMemoryDeviceGroupInfo {
        VkStructureType    sType;
        const void*        pNext;
        uint32_t           deviceIndexCount;
        const uint32_t*    pDeviceIndices;
    } VkBindBufferMemoryDeviceGroupInfo;

or the equivalent

    // Provided by VK_KHR_bind_memory2 with VK_KHR_device_group
    typedef VkBindBufferMemoryDeviceGroupInfo VkBindBufferMemoryDeviceGroupInfoKHR;

## Members

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `deviceIndexCount` is the number of elements in `pDeviceIndices`.

- `pDeviceIndices` is a pointer to an array of device indices.

## Description

If the `pNext` chain of VkBindBufferMemoryInfo includes a `VkBindBufferMemoryDeviceGroupInfo` structure, then that structure determines how memory is bound to buffers across multiple devices in a device group.

If `deviceIndexCount` is greater than zero, then on device index i the buffer is attached to the instance of `memory` on the physical device with device index `pDeviceIndices`[i].

If `deviceIndexCount` is zero and `memory` comes from a memory heap with the `VK_MEMORY_HEAP_MULTI_INSTANCE_BIT` bit set, then it is as if `pDeviceIndices` contains consecutive indices from zero to the number of physical devices in the logical device, minus one. In other words, by default each physical device attaches to its own instance of `memory`.

If `deviceIndexCount` is zero and `memory` comes from a memory heap without the `VK_MEMORY_HEAP_MULTI_INSTANCE_BIT` bit set, then it is as if `pDeviceIndices` contains an array of zeros. In other words, by default each physical device attaches to instance zero.

Valid Usage

- VUID-VkBindBufferMemoryDeviceGroupInfo-deviceIndexCount-01606
  `deviceIndexCount` must either be zero or equal to the number of physical devices in the logical device

- VUID-VkBindBufferMemoryDeviceGroupInfo-pDeviceIndices-01607
  All elements of `pDeviceIndices` must be valid device indices

Valid Usage (Implicit)

- VUID-VkBindBufferMemoryDeviceGroupInfo-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_BIND_BUFFER_MEMORY_DEVICE_GROUP_INFO`

- VUID-VkBindBufferMemoryDeviceGroupInfo-pDeviceIndices-parameter
  If `deviceIndexCount` is not `0`, `pDeviceIndices` must be a valid pointer to an array of `deviceIndexCount` `uint32_t` values

## See Also

VK_VERSION_1_1, VkStructureType

## 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 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0