C Specification

The VkSwapchainPresentModeInfoEXT structure is defined as:

// Provided by VK_EXT_swapchain_maintenance1
typedef struct VkSwapchainPresentModeInfoEXT {
    VkStructureType            sType;
    const void*                pNext;
    uint32_t                   swapchainCount;
    const VkPresentModeKHR*    pPresentModes;
} VkSwapchainPresentModeInfoEXT;

Members

  • sType is the type of this structure.

  • pNext is NULL or a pointer to a structure extending this structure.

  • swapchainCount is the number of swapchains being presented to by this command.

  • pPresentModes is a list of presentation modes with swapchainCount entries.

Description

If the pNext chain of VkPresentInfoKHR includes a VkSwapchainPresentModeInfoEXT structure, then that structure defines the presentation modes used for the current and subsequent presentation operations.

When the application changes present modes with VkSwapchainPresentModeInfoEXT, images that have already been queued for presentation will continue to be presented according to the previous present mode. The current image being queued for presentation and subsequent images will be presented according to the new present mode. The behavior during the transition between the two modes is defined as follows.

  • Transition from VK_PRESENT_MODE_SHARED_CONTINUOUS_REFRESH_KHR to VK_PRESENT_MODE_SHARED_DEMAND_REFRESH_KHR: the presentation engine updates the shared presentable image according to the behavior of VK_PRESENT_MODE_SHARED_DEMAND_REFRESH_KHR.

  • Transition from VK_PRESENT_MODE_SHARED_DEMAND_REFRESH_KHR to VK_PRESENT_MODE_SHARED_CONTINUOUS_REFRESH_KHR: the presentation engine may update the shared presentable image or defer that to its regular refresh cycle, according to the behavior of VK_PRESENT_MODE_SHARED_CONTINUOUS_REFRESH_KHR.

  • Transition between VK_PRESENT_MODE_FIFO_KHR and VK_PRESENT_MODE_FIFO_RELAXED_KHR: Images continue to be appended to the same FIFO queue, and the behavior with respect to waiting for vertical blanking period will follow the new mode for current and subsequent images.

  • Transition from VK_PRESENT_MODE_IMMEDIATE_KHR to VK_PRESENT_MODE_FIFO_KHR or VK_PRESENT_MODE_FIFO_RELAXED_KHR: As all prior present requests in the VK_PRESENT_MODE_IMMEDIATE_KHR mode are applied immediately, there are no outstanding present operations in this mode, and current and subsequent images are appended to the FIFO queue and presented according to the new mode.

  • Transition from VK_PRESENT_MODE_MAILBOX_KHR to VK_PRESENT_MODE_FIFO_KHR or VK_PRESENT_MODE_FIFO_RELAXED_KHR: Presentation in both modes require waiting for the next vertical blanking period, with VK_PRESENT_MODE_MAILBOX_KHR allowing the pending present operation to be replaced by a new one. In this case, the current present operation will replace the pending present operation and is applied according to the new mode.

  • Transition from VK_PRESENT_MODE_FIFO_KHR or VK_PRESENT_MODE_FIFO_RELAXED_KHR to VK_PRESENT_MODE_IMMEDIATE_KHR or VK_PRESENT_MODE_MAILBOX_KHR: If the FIFO queue is empty, presentation is done according to the behavior of the new mode. If there are present operations in the FIFO queue, once the last present operation is performed based on the respective vertical blanking period, the current and subsequent updates are applied according to the new mode.

  • The behavior during transition between any other present modes, if possible, is implementation defined.

Valid Usage

  • VUID-VkSwapchainPresentModeInfoEXT-swapchainCount-07760
    swapchainCount must be equal to VkPresentInfoKHR::swapchainCount

  • VUID-VkSwapchainPresentModeInfoEXT-pPresentModes-07761
    Each entry in pPresentModes must be a presentation mode specified in VkSwapchainPresentModesCreateInfoEXT::pPresentModes when creating the entry’s corresponding swapchain

Valid Usage (Implicit)

  • VUID-VkSwapchainPresentModeInfoEXT-sType-sType
    sType must be VK_STRUCTURE_TYPE_SWAPCHAIN_PRESENT_MODE_INFO_EXT

  • VUID-VkSwapchainPresentModeInfoEXT-pPresentModes-parameter
    pPresentModes must be a valid pointer to an array of swapchainCount valid VkPresentModeKHR values

  • VUID-VkSwapchainPresentModeInfoEXT-swapchainCount-arraylength
    swapchainCount must be greater than 0

See Also

VK_EXT_swapchain_maintenance1, VkPresentModeKHR, 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 2014-2023 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0