VkDeviceGroupPresentInfoKHR(3)

# VkDeviceGroupPresentInfoKHR(3) Manual Page

## Name

VkDeviceGroupPresentInfoKHR - Mode and mask controlling which physical devices' images are presented

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## C Specification

If the `pNext` chain of VkPresentInfoKHR includes a `VkDeviceGroupPresentInfoKHR` structure, then that structure includes an array of device masks and a device group present mode.

The `VkDeviceGroupPresentInfoKHR` structure is defined as:

    // Provided by VK_VERSION_1_1 with VK_KHR_swapchain, VK_KHR_device_group with VK_KHR_swapchain
    typedef struct VkDeviceGroupPresentInfoKHR {
        VkStructureType                        sType;
        const void*                            pNext;
        uint32_t                               swapchainCount;
        const uint32_t*                        pDeviceMasks;
        VkDeviceGroupPresentModeFlagBitsKHR    mode;
    } VkDeviceGroupPresentInfoKHR;

## Members

- `sType` is the type of this structure.

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

- `swapchainCount` is zero or the number of elements in `pDeviceMasks`.

- `pDeviceMasks` is a pointer to an array of device masks, one for each element of VkPresentInfoKHR::`pSwapchains`.

- `mode` is a VkDeviceGroupPresentModeFlagBitsKHR value specifying the device group present mode that will be used for this present.

## Description

If `mode` is `VK_DEVICE_GROUP_PRESENT_MODE_LOCAL_BIT_KHR`, then each element of `pDeviceMasks` selects which instance of the swapchain image is presented. Each element of `pDeviceMasks` must have exactly one bit set, and the corresponding physical device must have a presentation engine as reported by VkDeviceGroupPresentCapabilitiesKHR.

If `mode` is `VK_DEVICE_GROUP_PRESENT_MODE_REMOTE_BIT_KHR`, then each element of `pDeviceMasks` selects which instance of the swapchain image is presented. Each element of `pDeviceMasks` must have exactly one bit set, and some physical device in the logical device must include that bit in its VkDeviceGroupPresentCapabilitiesKHR::`presentMask`.

If `mode` is `VK_DEVICE_GROUP_PRESENT_MODE_SUM_BIT_KHR`, then each element of `pDeviceMasks` selects which instances of the swapchain image are component-wise summed and the sum of those images is presented. If the sum in any component is outside the representable range, the value of that component is undefined. Each element of `pDeviceMasks` must have a value for which all set bits are set in one of the elements of VkDeviceGroupPresentCapabilitiesKHR::`presentMask`.

If `mode` is `VK_DEVICE_GROUP_PRESENT_MODE_LOCAL_MULTI_DEVICE_BIT_KHR`, then each element of `pDeviceMasks` selects which instance(s) of the swapchain images are presented. For each bit set in each element of `pDeviceMasks`, the corresponding physical device must have a presentation engine as reported by VkDeviceGroupPresentCapabilitiesKHR.

If `VkDeviceGroupPresentInfoKHR` is not provided or `swapchainCount` is zero then the masks are considered to be `1`. If `VkDeviceGroupPresentInfoKHR` is not provided, `mode` is considered to be `VK_DEVICE_GROUP_PRESENT_MODE_LOCAL_BIT_KHR`.

Valid Usage

- VUID-VkDeviceGroupPresentInfoKHR-swapchainCount-01297
  `swapchainCount` must equal `0` or VkPresentInfoKHR::`swapchainCount`

- VUID-VkDeviceGroupPresentInfoKHR-mode-01298
  If `mode` is `VK_DEVICE_GROUP_PRESENT_MODE_LOCAL_BIT_KHR`, then each element of `pDeviceMasks` must have exactly one bit set, and the corresponding element of VkDeviceGroupPresentCapabilitiesKHR::`presentMask` must be non-zero

- VUID-VkDeviceGroupPresentInfoKHR-mode-01299
  If `mode` is `VK_DEVICE_GROUP_PRESENT_MODE_REMOTE_BIT_KHR`, then each element of `pDeviceMasks` must have exactly one bit set, and some physical device in the logical device must include that bit in its VkDeviceGroupPresentCapabilitiesKHR::`presentMask`

- VUID-VkDeviceGroupPresentInfoKHR-mode-01300
  If `mode` is `VK_DEVICE_GROUP_PRESENT_MODE_SUM_BIT_KHR`, then each element of `pDeviceMasks` must have a value for which all set bits are set in one of the elements of VkDeviceGroupPresentCapabilitiesKHR::`presentMask`

- VUID-VkDeviceGroupPresentInfoKHR-mode-01301
  If `mode` is `VK_DEVICE_GROUP_PRESENT_MODE_LOCAL_MULTI_DEVICE_BIT_KHR`, then for each bit set in each element of `pDeviceMasks`, the corresponding element of VkDeviceGroupPresentCapabilitiesKHR::`presentMask` must be non-zero

- VUID-VkDeviceGroupPresentInfoKHR-pDeviceMasks-01302
  The value of each element of `pDeviceMasks` must be equal to the device mask passed in VkAcquireNextImageInfoKHR::`deviceMask` when the image index was last acquired

- VUID-VkDeviceGroupPresentInfoKHR-mode-01303
  `mode` must have exactly one bit set, and that bit must have been included in VkDeviceGroupSwapchainCreateInfoKHR::`modes`

Valid Usage (Implicit)

- VUID-VkDeviceGroupPresentInfoKHR-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_DEVICE_GROUP_PRESENT_INFO_KHR`

- VUID-VkDeviceGroupPresentInfoKHR-pDeviceMasks-parameter
  If `swapchainCount` is not `0`, `pDeviceMasks` must be a valid pointer to an array of `swapchainCount` `uint32_t` values

- VUID-VkDeviceGroupPresentInfoKHR-mode-parameter
  `mode` must be a valid VkDeviceGroupPresentModeFlagBitsKHR value

## See Also

VK_KHR_device_group, VK_KHR_swapchain, VK_VERSION_1_1, VkDeviceGroupPresentModeFlagBitsKHR, 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 2014-2022 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0