# VkBindBufferMemoryDeviceGroupInfo(3) Manual Page

## Name

VkBindBufferMemoryDeviceGroupInfo - Structure specifying device within a group to bind to

## C Specification

    typedef struct VkBindBufferMemoryDeviceGroupInfo {
        VkStructureType    sType;
        const void*        pNext;
        uint32_t           deviceIndexCount;
        const uint32_t*    pDeviceIndices;
    } VkBindBufferMemoryDeviceGroupInfo;

or the equivalent

    typedef VkBindBufferMemoryDeviceGroupInfo VkBindBufferMemoryDeviceGroupInfoKHR;

## Members

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

## Description

The `VkBindBufferMemoryDeviceGroupInfo` structure is defined as:

- `sType` is the type of this structure.

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

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

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

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

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

- All elements of `pDeviceIndices` must be valid device indices

Valid Usage (Implicit)

- `sType` must be `VK_STRUCTURE_TYPE_BIND_BUFFER_MEMORY_DEVICE_GROUP_INFO`

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

## See Also

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 (c) 2014-2020 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.