Destroying an image view

When we don't need an image view any more, we should destroy it.

How to do it...

1. Take the handle of a logical device and store it in a variable of type VkDevice named logical_device.
2. Take the handle of an image view stored in a variable of type VkImageView named image_view.
3. Call vkDestroyImageView( logical_device, image_view, nullptr ) and provide the handle of the logical device, the handle of the image view, and a nullptr value.
4. For safety reasons, assign a VK_NULL_HANDLE value to the image_view variable.

How it works...

Destroying an image view requires us to use its handle and the handle of the logical device on which the image view was created. It is performed in the following way:

if( VK_NULL_HANDLE != image_view ) { 
  vkDestroyImageView( logical_device, image_view, nullptr ); 
  image_view = VK_NULL_HANDLE; 
}

First, we check whether the handle is not empty. We don't need to do it--destroying a null handle is silently ignored. But it's good to skip unnecessary function...