Vulkan.Utils.QueueAssignment

Given a PhysicalDevice and a set of requirements for queues, calculate an assignment of queues to queue families and return information with which to create a Device and also a function to extract the requested Queues from the device.

You may want to create a custom type with a Traversable instance to store your queues like:

data MyQueues q = MyQueues
  { computeQueue            :: q
  , graphicsAndPresentQueue :: q
  , transferQueue           :: q
  }

myQueueSpecs :: MyQueues QueueSpec
myQueueSpecs = MyQueues
  { computeQueue            = QueueSpec 0.5 isComputeQueueFamily
  , graphicsAndPresentQueue = QueueSpec 1   isPresentQueueFamily
  , transferQueue           = QueueSpec 1   isTransferOnlyQueueFamily
  }

Note, this doesn't permit differentiating queue family assignment based on whether or not the queue is protected.

Requirements for a Queue to be assigned a family by assignQueues.

To assign to a specific queue family index f:

queueSpecFamilyPredicate = i _ -> i == f

To assign to any queue family which supports compute operations:

let isComputeQueue q = QUEUE_COMPUTE_BIT .&&. queueFlags q
in QueueSpec priority (_index q -> pure (isComputeQueue q))

Does this queue have QUEUE_TRANSFER_BIT set and not QUEUE_COMPUTE_BIT or QUEUE_GRAPHICS_BIT

Can this queue family present to this surface on this device