vkGetPhysicalDevicePresentRectanglesKHR(3)

# vkGetPhysicalDevicePresentRectanglesKHR(3) Manual Page

## Name

vkGetPhysicalDevicePresentRectanglesKHR - Query present rectangles for a surface on a physical device

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## C Specification

When using `VK_DEVICE_GROUP_PRESENT_MODE_LOCAL_MULTI_DEVICE_BIT_KHR`, the application may need to know which regions of the surface are used when presenting locally on each physical device. Presentation of swapchain images to this surface need only have valid contents in the regions returned by this command.

To query a set of rectangles used in presentation on the physical device, call:

    // Provided by VK_VERSION_1_1 with VK_KHR_swapchain, VK_KHR_device_group with VK_KHR_surface
    VkResult vkGetPhysicalDevicePresentRectanglesKHR(
        VkPhysicalDevice                            physicalDevice,
        VkSurfaceKHR                                surface,
        uint32_t*                                   pRectCount,
        VkRect2D*                                   pRects);

## Parameters

- `physicalDevice` is the physical device.

- `surface` is the surface.

- `pRectCount` is a pointer to an integer related to the number of rectangles available or queried, as described below.

- `pRects` is either `NULL` or a pointer to an array of VkRect2D structures.

## Description

If `pRects` is `NULL`, then the number of rectangles used when presenting the given `surface` is returned in `pRectCount`. Otherwise, `pRectCount` must point to a variable set by the user to the number of elements in the `pRects` array, and on return the variable is overwritten with the number of structures actually written to `pRects`. If the value of `pRectCount` is less than the number of rectangles, at most `pRectCount` structures will be written, and `VK_INCOMPLETE` will be returned instead of `VK_SUCCESS`, to indicate that not all the available rectangles were returned.

The values returned by this command are not invariant, and may change in response to the surface being moved, resized, or occluded.

The rectangles returned by this command must not overlap.

Valid Usage

- VUID-vkGetPhysicalDevicePresentRectanglesKHR-surface-06523
  `surface` must be a valid VkSurfaceKHR handle

- VUID-vkGetPhysicalDevicePresentRectanglesKHR-surface-06211
  `surface` must be supported by `physicalDevice`, as reported by vkGetPhysicalDeviceSurfaceSupportKHR or an equivalent platform-specific mechanism

Valid Usage (Implicit)

- VUID-vkGetPhysicalDevicePresentRectanglesKHR-physicalDevice-parameter
  `physicalDevice` must be a valid VkPhysicalDevice handle

- VUID-vkGetPhysicalDevicePresentRectanglesKHR-surface-parameter
  `surface` must be a valid VkSurfaceKHR handle

- VUID-vkGetPhysicalDevicePresentRectanglesKHR-pRectCount-parameter
  `pRectCount` must be a valid pointer to a `uint32_t` value

- VUID-vkGetPhysicalDevicePresentRectanglesKHR-pRects-parameter
  If the value referenced by `pRectCount` is not `0`, and `pRects` is not `NULL`, `pRects` must be a valid pointer to an array of `pRectCount` VkRect2D structures

- VUID-vkGetPhysicalDevicePresentRectanglesKHR-commonparent
  Both of `physicalDevice`, and `surface` must have been created, allocated, or retrieved from the same VkInstance

Host Synchronization

- Host access to `surface` must be externally synchronized

Return Codes

On success, this command returns

  - `VK_SUCCESS`

  - `VK_INCOMPLETE`

On failure, this command returns

  - `VK_ERROR_OUT_OF_HOST_MEMORY`

  - `VK_ERROR_OUT_OF_DEVICE_MEMORY`

## See Also

VK_KHR_device_group, VK_KHR_surface, VK_KHR_swapchain, VK_VERSION_1_1, VkPhysicalDevice, VkRect2D, VkSurfaceKHR

## 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