VkSwapchainPresentModeInfoEXT

The VkSwapchainPresentModeInfoEXT structure is defined as:

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

• sType is a VkStructureType value identifying 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.

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 or VK_PRESENT_MODE_FIFO_LATEST_READY_EXT : 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 or VK_PRESENT_MODE_FIFO_LATEST_READY_EXT : Presentation in FIFO 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 or VK_PRESENT_MODE_FIFO_LATEST_READY_EXT 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.
• Transition between VK_PRESENT_MODE_FIFO_KHR or VK_PRESENT_MODE_FIFO_RELAXED_KHR, and VK_PRESENT_MODE_FIFO_LATEST_READY_EXT: Images continue to be appended to the same FIFO queue, and the behavior with respect to waiting for vertical blanking period and dequeuing requests will follow the new mode for current and subsequent images.
• The behavior during transition between any other present modes, if possible, is implementation defined.