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;;;; units/unit.lisp
(in-package #:wheelwork)
(defclass/std unit ()
((cached-model cached-projected-matrix cached-application :a)
(container :with :a)
(base-width base-height :r :std 1.0 :doc "Determined by content.")
(scale-x scale-y :with :std 1.0)
(rotation x y :with :std 0.0)
(opacity :std 1.0 :doc "0.0 indicates it will not be rendred.")))
(defmethod (setf closer-mop:slot-value-using-class) :after
(newval class (unit unit) slot)
(case (closer-mop:slot-definition-name slot)
((x y scale-x scale-y rotation)
(setf (cached-model unit) nil
(cached-projected-matrix unit) nil))
(container
(setf (cached-application unit) nil))))
(defun scale-by (unit amount)
(with-slots (scale-x scale-y) unit
(setf scale-x (* amount scale-x)
scale-y (* amount scale-y))))
(defun set-width-preserve-aspect (unit new-width)
(scale-by unit (/ new-width (unit-width unit))))
(defun set-height-preserve-aspect (unit new-height)
(scale-by unit (/ new-height (unit-height unit) )))
(defmethod unit-width ((unit unit))
(with-slots (scale-x base-width) unit
(* scale-x base-width)))
(defmethod unit-height ((unit unit))
(with-slots (scale-y base-height) unit
(* scale-y base-height)))
(defmethod (setf unit-width) (newval (unit unit))
(with-slots (scale-x base-width) unit
(setf scale-x (coerce (/ newval base-width) 'single-float))))
(defmethod (setf unit-height) (newval (unit unit))
(with-slots (scale-y base-height) unit
(setf scale-y (coerce (/ newval base-height) 'single-float))))
(defmethod model-matrix :around ((u unit))
(or (cached-model u)
(setf (cached-model u)
(call-next-method))))
(defmethod model-matrix ((u unit))
(let ((m (mat:meye 4)))
(with-slots (x y base-width scale-x base-height scale-y rotation) u
(let ((uw (* base-width scale-x))
(uh (* base-height scale-y)))
(mat:nmtranslate m (vec:vec x y 0.0))
(mat:nmtranslate m (vec:v* 0.5 (vec:vec uw uh 0.0)))
(mat:nmrotate m vec:+vz+ rotation)
(mat:nmtranslate m (vec:v* -0.5 (vec:vec uw uh 0.0)))
(mat:nmscale m (vec:vec uw uh 1.0))))
m))
(defun app-of-unit (unit)
"Returns the APPLICATION instance, if any, of which this UNIT is a
part. NIL indicates that the unit has not been added to any container
in this application."
(or (cached-application unit)
(setf (cached-application unit)
(labels ((rec (u)
(when-let (c (unit-container u))
(etypecase c
(application c)
(unit (rec c))
(null nil)))))
(rec unit)))))
(defun projected-matrix (unit)
(or (cached-projected-matrix unit)
(setf (cached-projected-matrix unit)
(mat:marr (mat:m* (application-projection (app-of-unit unit))
(model-matrix unit))))))
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