Resource Slots

The resourceSlot is a declarative API for changing resource between nodes in daFrameGraph.

You can think about slot as “more virtual” frame graph resource. This type of resource can change size and resource creation flags while frame graph execution.

Use slots instead of usual resources if:

Node have to read from and write to some resource at the same time.
Size or type of resource need to be changed in some node.

For work with resource slots you need:

Start from usual daframegraph::register_node, see Declaring Node.
Replace daframegraph::NodeHandle with resource_slot::NodeHandleWithSlotsAccess.
Replace daframegraph::register_node with resource_slot::register_access.
- Declaration callback will get additional parameter resource_slot::State slotsState.
Add action_list for the node:
- If node creates a first resource for slot, node should declare Create{slot_name, created_resource_name}.
  - Node gets name of resource for filling the slot after node with slotsState.resourceToCreateFor.
- If node updates a resource in the slot, node should declare Update{slot_name, updated_resource_name, priority}.
  - Node gets name of resource for filling the slot after node with slotsState.resourceToCreateFor.
  - Node gets name of resource, that was in the slot before the node with slotsState.resourceToReadFrom.
  - Nodes with higher priority will be scheduled after nodes with lower priority.
- If node read a resource from the slot, node should declare Read{slot_name}.
  - Node gets name of resource, that was in the slot before the node with slotsState.resourceToReadFrom.
  - Optionally, node can declare read priority for read intermediate resource from the slot. By default read nodes will be scheduled after all updating nodes.