# vkCmdSetDeviceMask(3) Manual Page

## Name

vkCmdSetDeviceMask - Modify device mask of a command buffer

## C Specification

To update the current device mask of a command buffer, call:

    void vkCmdSetDeviceMask(
        VkCommandBuffer                             commandBuffer,
        uint32_t                                    deviceMask);

or the equivalent command

    void vkCmdSetDeviceMaskKHR(
        VkCommandBuffer                             commandBuffer,
        uint32_t                                    deviceMask);

## Parameters

- `commandBuffer` is command buffer whose current device mask is modified.

- `deviceMask` is the new value of the current device mask.

## Description

`deviceMask` is used to filter out subsequent commands from executing on all physical devices whose bit indices are not set in the mask, except commands beginning a render pass instance, commands transitioning to the next subpass in the render pass instance, and commands ending a render pass instance, which always execute on the set of physical devices whose bit indices are included in the `deviceMask` member of the VkDeviceGroupRenderPassBeginInfo structure passed to the command beginning the corresponding render pass instance.

Valid Usage

- `deviceMask` must be a valid device mask value

- `deviceMask` must not be zero

- `deviceMask` must not include any set bits that were not in the VkDeviceGroupCommandBufferBeginInfo::`deviceMask` value when the command buffer began recording.

- If `vkCmdSetDeviceMask` is called inside a render pass instance, `deviceMask` must not include any set bits that were not in the VkDeviceGroupRenderPassBeginInfo::`deviceMask` value when the render pass instance began recording.

Valid Usage (Implicit)

- `commandBuffer` must be a valid VkCommandBuffer handle

- `commandBuffer` must be in the recording state

- The `VkCommandPool` that `commandBuffer` was allocated from must support graphics, compute, or transfer operations

Host Synchronization

- Host access to `commandBuffer` must be externally synchronized

- Host access to the `VkCommandPool` that `commandBuffer` was allocated from must be externally synchronized

Command Properties

Command Buffer Levels | Render Pass Scope | Supported Queue Types | Pipeline Type
--- | --- | --- | ---
Primary Secondary | Both | Graphics Compute Transfer |

## See Also

VkCommandBuffer

## 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.