Destroying a fence

Fences can be reused multiple times. But when we don't need them anymore, typically just before we close our application, we should destroy them.

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 a fence that should be destroyed. Use the handle to initialize a variable of type VkFence named fence.
3. Call vkDestroyFence( logical_device, fence, nullptr ) and provide the logical device's handle, the fence variable and a nullptr value.
4. For safety reasons, assign the VK_NULL_HANDLE value to the fence variable.

How it works...

Fences are destroyed using the vkDestroyFence() function, like this:

if( VK_NULL_HANDLE != fence ) { 
  vkDestroyFence( logical_device, fence, nullptr ); 
  fence = VK_NULL_HANDLE; 
}

We don't need to check if a value of the fence variable is not equal to the VK_NULL_HANDLE value because destruction of a null handle will be ignored by the driver. But, we do this to skip an unnecessary...