C Specification

The VkSwapchainCreateInfoKHR structure is defined as:

typedef struct VkSwapchainCreateInfoKHR {
    VkStructureType                  sType;
    const void*                      pNext;
    VkSwapchainCreateFlagsKHR        flags;
    VkSurfaceKHR                     surface;
    uint32_t                         minImageCount;
    VkFormat                         imageFormat;
    VkColorSpaceKHR                  imageColorSpace;
    VkExtent2D                       imageExtent;
    uint32_t                         imageArrayLayers;
    VkImageUsageFlags                imageUsage;
    VkSharingMode                    imageSharingMode;
    uint32_t                         queueFamilyIndexCount;
    const uint32_t*                  pQueueFamilyIndices;
    VkSurfaceTransformFlagBitsKHR    preTransform;
    VkCompositeAlphaFlagBitsKHR      compositeAlpha;
    VkPresentModeKHR                 presentMode;
    VkBool32                         clipped;
    VkSwapchainKHR                   oldSwapchain;
} VkSwapchainCreateInfoKHR;

Members

  • sType is the type of this structure.

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

  • flags is a bitmask of VkSwapchainCreateFlagBitsKHR indicating parameters of the swapchain creation.

  • surface is the surface onto which the swapchain will present images. If the creation succeeds, the swapchain becomes associated with surface.

  • minImageCount is the minimum number of presentable images that the application needs. The implementation will either create the swapchain with at least that many images, or it will fail to create the swapchain.

  • imageFormat is a VkFormat value specifying the format the swapchain image(s) will be created with.

  • imageColorSpace is a VkColorSpaceKHR value specifying the way the swapchain interprets image data.

  • imageExtent is the size (in pixels) of the swapchain image(s). The behavior is platform-dependent if the image extent does not match the surface’s currentExtent as returned by vkGetPhysicalDeviceSurfaceCapabilitiesKHR.

Description

Note

On some platforms, it is normal that maxImageExtent may become (0, 0), for example when the window is minimized. In such a case, it is not possible to create a swapchain due to the Valid Usage requirements.

  • imageArrayLayers is the number of views in a multiview/stereo surface. For non-stereoscopic-3D applications, this value is 1.

  • imageUsage is a bitmask of VkImageUsageFlagBits describing the intended usage of the (acquired) swapchain images.

  • imageSharingMode is the sharing mode used for the image(s) of the swapchain.

  • queueFamilyIndexCount is the number of queue families having access to the image(s) of the swapchain when imageSharingMode is VK_SHARING_MODE_CONCURRENT.

  • pQueueFamilyIndices is an array of queue family indices having access to the images(s) of the swapchain when imageSharingMode is VK_SHARING_MODE_CONCURRENT.

  • preTransform is a VkSurfaceTransformFlagBitsKHR value describing the transform, relative to the presentation engine’s natural orientation, applied to the image content prior to presentation. If it does not match the currentTransform value returned by vkGetPhysicalDeviceSurfaceCapabilitiesKHR, the presentation engine will transform the image content as part of the presentation operation.

  • compositeAlpha is a VkCompositeAlphaFlagBitsKHR value indicating the alpha compositing mode to use when this surface is composited together with other surfaces on certain window systems.

  • presentMode is the presentation mode the swapchain will use. A swapchain’s present mode determines how incoming present requests will be processed and queued internally.

  • clipped specifies whether the Vulkan implementation is allowed to discard rendering operations that affect regions of the surface that are not visible.

    • If set to VK_TRUE, the presentable images associated with the swapchain may not own all of their pixels. Pixels in the presentable images that correspond to regions of the target surface obscured by another window on the desktop, or subject to some other clipping mechanism will have undefined content when read back. Pixel shaders may not execute for these pixels, and thus any side effects they would have had will not occur. VK_TRUE value does not guarantee any clipping will occur, but allows more optimal presentation methods to be used on some platforms.

    • If set to VK_FALSE, presentable images associated with the swapchain will own all of the pixels they contain.

Note

Applications should set this value to VK_TRUE if they do not expect to read back the content of presentable images before presenting them or after reacquiring them, and if their pixel shaders do not have any side effects that require them to run for all pixels in the presentable image.

  • oldSwapchain is VK_NULL_HANDLE, or the existing non-retired swapchain currently associated with surface. Providing a valid oldSwapchain may aid in the resource reuse, and also allows the application to still present any images that are already acquired from it.

Upon calling vkCreateSwapchainKHR with an oldSwapchain that is not VK_NULL_HANDLE, oldSwapchain is retired — even if creation of the new swapchain fails. The new swapchain is created in the non-retired state whether or not oldSwapchain is VK_NULL_HANDLE.

Upon calling vkCreateSwapchainKHR with an oldSwapchain that is not VK_NULL_HANDLE, any images from oldSwapchain that are not acquired by the application may be freed by the implementation, which may occur even if creation of the new swapchain fails. The application can destroy oldSwapchain to free all memory associated with oldSwapchain.

Note

Multiple retired swapchains can be associated with the same VkSurfaceKHR through multiple uses of oldSwapchain that outnumber calls to vkDestroySwapchainKHR.

After oldSwapchain is retired, the application can pass to vkQueuePresentKHR any images it had already acquired from oldSwapchain. E.g., an application may present an image from the old swapchain before an image from the new swapchain is ready to be presented. As usual, vkQueuePresentKHR may fail if oldSwapchain has entered a state that causes VK_ERROR_OUT_OF_DATE_KHR to be returned.

The application can continue to use a shared presentable image obtained from oldSwapchain until a presentable image is acquired from the new swapchain, as long as it has not entered a state that causes it to return VK_ERROR_OUT_OF_DATE_KHR.

Valid Usage
  • surface must be a surface that is supported by the device as determined using vkGetPhysicalDeviceSurfaceSupportKHR

  • minImageCount must be greater than or equal to the value returned in the minImageCount member of the VkSurfaceCapabilitiesKHR structure returned by vkGetPhysicalDeviceSurfaceCapabilitiesKHR for the surface

  • minImageCount must be less than or equal to the value returned in the maxImageCount member of the VkSurfaceCapabilitiesKHR structure returned by vkGetPhysicalDeviceSurfaceCapabilitiesKHR for the surface if the returned maxImageCount is not zero

  • minImageCount must be 1 if presentMode is either VK_PRESENT_MODE_SHARED_DEMAND_REFRESH_KHR or VK_PRESENT_MODE_SHARED_CONTINUOUS_REFRESH_KHR

  • imageFormat and imageColorSpace must match the format and colorSpace members, respectively, of one of the VkSurfaceFormatKHR structures returned by vkGetPhysicalDeviceSurfaceFormatsKHR for the surface

  • imageExtent must be between minImageExtent and maxImageExtent, inclusive, where minImageExtent and maxImageExtent are members of the VkSurfaceCapabilitiesKHR structure returned by vkGetPhysicalDeviceSurfaceCapabilitiesKHR for the surface

  • imageExtent members width and height must both be non-zero

  • imageArrayLayers must be greater than 0 and less than or equal to the maxImageArrayLayers member of the VkSurfaceCapabilitiesKHR structure returned by vkGetPhysicalDeviceSurfaceCapabilitiesKHR for the surface

  • If presentMode is VK_PRESENT_MODE_IMMEDIATE_KHR, VK_PRESENT_MODE_MAILBOX_KHR, VK_PRESENT_MODE_FIFO_KHR or VK_PRESENT_MODE_FIFO_RELAXED_KHR, imageUsage must be a subset of the supported usage flags present in the supportedUsageFlags member of the VkSurfaceCapabilitiesKHR structure returned by vkGetPhysicalDeviceSurfaceCapabilitiesKHR for surface

  • If presentMode is VK_PRESENT_MODE_SHARED_DEMAND_REFRESH_KHR or VK_PRESENT_MODE_SHARED_CONTINUOUS_REFRESH_KHR, imageUsage must be a subset of the supported usage flags present in the sharedPresentSupportedUsageFlags member of the VkSharedPresentSurfaceCapabilitiesKHR structure returned by vkGetPhysicalDeviceSurfaceCapabilities2KHR for surface

  • If imageSharingMode is VK_SHARING_MODE_CONCURRENT, pQueueFamilyIndices must be a valid pointer to an array of queueFamilyIndexCount uint32_t values

  • If imageSharingMode is VK_SHARING_MODE_CONCURRENT, queueFamilyIndexCount must be greater than 1

  • If imageSharingMode is VK_SHARING_MODE_CONCURRENT, each element of pQueueFamilyIndices must be unique and must be less than pQueueFamilyPropertyCount returned by either vkGetPhysicalDeviceQueueFamilyProperties or vkGetPhysicalDeviceQueueFamilyProperties2 for the physicalDevice that was used to create device

  • preTransform must be one of the bits present in the supportedTransforms member of the VkSurfaceCapabilitiesKHR structure returned by vkGetPhysicalDeviceSurfaceCapabilitiesKHR for the surface

  • compositeAlpha must be one of the bits present in the supportedCompositeAlpha member of the VkSurfaceCapabilitiesKHR structure returned by vkGetPhysicalDeviceSurfaceCapabilitiesKHR for the surface

  • presentMode must be one of the VkPresentModeKHR values returned by vkGetPhysicalDeviceSurfacePresentModesKHR for the surface

  • If the logical device was created with VkDeviceGroupDeviceCreateInfo::physicalDeviceCount equal to 1, flags must not contain VK_SWAPCHAIN_CREATE_SPLIT_INSTANCE_BIND_REGIONS_BIT_KHR

  • If oldSwapchain is not VK_NULL_HANDLE, oldSwapchain must be a non-retired swapchain associated with native window referred to by surface

  • The implied image creation parameters of the swapchain must be supported as reported by vkGetPhysicalDeviceImageFormatProperties

  • If flags contains VK_SWAPCHAIN_CREATE_MUTABLE_FORMAT_BIT_KHR then the pNext chain must contain an instance of VkImageFormatListCreateInfoKHR with a viewFormatCount greater than zero and pViewFormats must have an element equal to imageFormat

  • If flags contains VK_SWAPCHAIN_CREATE_PROTECTED_BIT_KHR, then VkSurfaceProtectedCapabilitiesKHR::supportsProtected must be VK_TRUE in the VkSurfaceProtectedCapabilitiesKHR structure returned by vkGetPhysicalDeviceSurfaceCapabilities2KHR for surface

  • If the pNext chain includes an instance of VkSurfaceFullScreenExclusiveInfoEXT with its fullScreenExclusive member set to VK_FULL_SCREEN_EXCLUSIVE_APPLICATION_CONTROLLED_EXT, and surface was created using vkCreateWin32SurfaceKHR, an instance of VkSurfaceFullScreenExclusiveWin32InfoEXT must be present in the pNext chain

Valid Usage (Implicit)

See Also

Document Notes

For more information, see the Vulkan Specification at URL

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

Copyright (c) 2014-2019 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.