87 lines
2.8 KiB
Common Lisp
87 lines
2.8 KiB
Common Lisp
;;;; wh-engine/scene.lisp
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(in-package wh-engine)
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(defclass scene ()
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((id :documentation "This scene's unique ID."
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:reader id
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:type fixnum
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:initarg :id
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:initform 0)
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(name :documentation "This scene's human-readable name."
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:accessor name
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:type string
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:initarg :name
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:initform "")
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(actors :documentation "A list containing all actors in the scene."
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:reader actors
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:type (proper-list actor)
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:initform nil)
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(destroyed-p :documentation "If true, this scene will be unloaded."
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:reader destroyed-p
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:type boolean
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:initform nil))
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(:documentation "A scene containing game entities."))
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(defmethod make-load-form ((this scene) &optional environment)
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;(make-load-form-saving-slots this :environment environment)
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(make-generic-load-form this :environment environment))
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(defmethod print-object ((this scene) stream)
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(print-unreadable-object (this stream :type t :identity t)
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(prin1 [this :slot id] stream)
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(princ " ")
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(prin1 [this :slot name] stream)))
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(defmethod add-actor ((this scene) actor)
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"Add an actor to this scene."
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(when [actor scene]
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(error "~S is already in scene ~S" actor [actor scene]))
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(push actor [this :slot actors])
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(setf [actor :slot scene] (make-weak-pointer this))
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actor)
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(defmethod remove-actor ((this scene) actor)
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"Remove an actor from this scene."
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(unless (eq [actor scene] this)
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(error "~S is not in scene ~S" actor this))
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(setf [this :slot actors] (delete actor [this :slot actors] :count 1))
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(setf [actor :slot scene] nil)
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actor)
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(defmethod get-actor ((this scene) actor-id)
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"Get the actor with the specified ID in this scene."
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(find-if (lambda (actor) (eq [actor id] actor-id)) [this actors]))
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(defmethod get-tagged-actors ((this scene) tags)
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"Get all actors tagged with the given set of tags."
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(loop for actor in [this actors]
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if (subsetp tags [actor tags])
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collect actor))
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(defmethod update ((this scene))
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"Update all actors in this scene."
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(loop for actor in [this actors]
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unless (or [actor destroyed-p] (not [actor tree-active-p]))
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do [actor (update)]))
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(defmethod destroy ((this scene))
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"Mark this scene for unloading."
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(unless [this destroyed-p]
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; We're dead, clean up actors
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(loop for actor in [this actors]
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do [actor (destroy)])
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(remove-scene this))
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(setf [this :slot destroyed-p] t))
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(defmethod resume ((this scene))
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"Initialize or restore this scene's state."
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; Restore actors
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(loop for actor in [this actors]
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do [actor (resume)]))
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(defmethod suspend ((this scene))
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"Prepare this scene for serialization."
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; Suspend actors
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(loop for actor in [this actors]
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do [actor (suspend)]))
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