VkPresentInfoKHR

VkPresentInfoKHR is a structure used in the Vulkan graphics API to describe parameters for presenting rendered images to a surface. It is a key component of the swapchain mechanism, allowing applications to display the results of their rendering operations to the user.

The structure contains several members. A pointer to the next structure in a chain, `pNext`, allows for extending the structure's functionality. The `waitSemaphoreCount` and `pWaitSemaphores` members specify a list of semaphores that must be signaled before the presentation can begin. This is crucial for synchronizing rendering operations with presentation.

The `swapchainCount` and `pSwapchains` members define the swapchains that will be used for presentation. A `pImageIndices` member provides an array of indices, where each index corresponds to the image in the respective swapchain that is ready to be presented. The `pResults` member can be used to receive VkResult values for each swapchain, indicating the success or failure of the presentation operation for that specific swapchain.

When `vkQueuePresentKHR` is called with a VkPresentInfoKHR structure, the Vulkan implementation attempts to present the specified images from the swapchains to their associated surfaces. The presentation operation is asynchronous, meaning that `vkQueuePresentKHR` returns immediately after queuing the presentation request, and the actual display of the image occurs later. The wait semaphores ensure that all necessary rendering work has completed before the image is presented.