Presenting an image

After we are done rendering into a swapchain image or using it for any other purposes, we need to give the image back to the presentation engine. This operation is called a presentation and it displays an image on screen.

Getting ready

In this recipe, we will be using a custom structure defined as follows:

struct PresentInfo { 
  VkSwapchainKHR  Swapchain; 
  uint32_t        ImageIndex; 
};

It is used to define a swapchain from which we want to present an image, and an image (its index) that we want to display. For each swapchain, we can present only one image at a time.

How to do it...

1. Prepare a handle of a queue that supports presenting. Store it in a variable of type VkQueue named queue.
2. Prepare a variable of type std::vector<VkSemaphore> named rendering_semaphores. Into this vector, insert semaphores associated with rendering commands that reference images which we want to present.
3. Create a variable of type std::vector<VkSwapchainKHR> named swapchains in which...