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https://github.com/open-goal/jak-project.git
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9b905f903c
* clean-up various files, do `game-h` and `generic-obs-h` * cleanup `smush-control-h` * cleanup `collide-edge-grab-h`, `collide-mesh-h`, `collide-shape-h` * [goal lib]organize minor things * Fix a library command before I forget again * fix
143 lines
4.9 KiB
Common Lisp
143 lines
4.9 KiB
Common Lisp
;;-*-Lisp-*-
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(in-package goal)
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;; name: smush-control-h.gc
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;; name in dgo: smush-control-h
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;; dgos: GAME, ENGINE
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;; A "smush-control" generates a damped sinusoidal floating point value.
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;; - on each full period, the amplitude and period are changed (multiplied)
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;; - there is a maximum duration.
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;; - the amplitude is additionally linearly scaled to go to zero over the duration.
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(deftype smush-control (structure)
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((start-time uint64 :offset-assert 0)
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(period float :offset-assert 8)
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(duration float :offset-assert 12)
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(amp float :offset-assert 16)
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(damp-amp float :offset-assert 20)
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(damp-period float :offset-assert 24) ;; set a negative value here to flag as die on next update
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(ticks float :offset-assert 28)
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)
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:method-count-assert 15
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:size-assert #x20
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:flag-assert #xf00000020
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(:methods
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(set-zero! (_type_) _type_ 9)
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(update! (_type_) float 10)
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(get-no-update (_type_) float 11)
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(activate! (_type_ float int int float float float) _type_ 12)
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(nonzero-amplitude? (_type_) symbol 13)
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(die-on-next-update! (_type_) _type_ 14)
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)
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)
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(defmethod nonzero-amplitude? smush-control ((obj smush-control))
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"Return #t if amp is not zero, #f otherwise"
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(declare (inline))
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(!= (-> obj amp) 0.0)
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)
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(defmethod set-zero! smush-control ((obj smush-control))
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(set! (-> obj period) 0.0)
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(set! (-> obj duration) 0.0)
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(set! (-> obj amp) 0.0)
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(set! (-> obj damp-amp) 0.0)
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(set! (-> obj damp-period) 0.0)
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(set! (-> obj ticks) 0.0)
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obj
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)
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(defmethod update! smush-control ((obj smush-control))
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"Run the smush control and return the result. Updates the internal state."
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(cond
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((nonzero-amplitude? obj)
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(let* ((time-since-start (the float (- (-> *display* base-frame-counter) (-> obj start-time))))
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;; use float to int rounding to figure out offset into the current period.
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(time-since-period-start (- time-since-start (* (the float (the int (/ time-since-start (-> obj period)))) (-> obj period))))
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)
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;; we completed a new period!
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(when (>= (- time-since-start (-> obj ticks)) (-> obj period))
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;; once per period updates of amp/period
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(set! (-> obj amp) (* (-> obj amp) (-> obj damp-amp)))
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(set! (-> obj period) (* (-> obj period) (-> obj damp-period)))
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;; store the ticks that we did this on
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(set! (-> obj ticks) time-since-start)
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;; you can set damp-period to a negative number to indicate
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;; that it should die on the next update. Do that here.
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(if (< (-> obj damp-period) 0.0)
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(set-zero! obj)
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)
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)
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;; absolute duraction check
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(if (>= time-since-start (-> obj duration))
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(set-zero! obj)
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)
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;; sine term multiplied by amplitude, and scaled by how much is left to go.
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(* (sin (/ (* DEGREES_PER_ROT time-since-period-start) (-> obj period)))
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(* (-> obj amp)
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(/ (- (-> obj duration) time-since-start) (-> obj duration)))
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)
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)
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)
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;; amplitude = 0, die.
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(else 0.0)
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)
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)
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(defmethod get-no-update smush-control ((obj smush-control))
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"Get the value, but don't update internal state"
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(cond
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((nonzero-amplitude? obj)
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(let* ((time-since-start (the float (- (-> *display* base-frame-counter) (-> obj start-time))))
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(time-since-period-start (- time-since-start (* (the float (the int (/ time-since-start (-> obj period)))) (-> obj period))))
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)
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(* (sin (/ (* DEGREES_PER_ROT time-since-period-start) (-> obj period)))
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(* (-> obj amp)
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(/ (- (-> obj duration) time-since-start) (-> obj duration)))
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)
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)
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)
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;; amplitude = 0, die.
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(else 0.0)
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)
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)
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(defmethod die-on-next-update! smush-control ((obj smush-control))
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"On the next call to update!, zero everything.
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Calls to get-no-update will still work."
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(if (nonzero-amplitude? obj)
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(set! (-> obj damp-period) -1.0)
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)
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obj
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)
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(defmethod activate! smush-control ((obj smush-control)
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(arg0 float)
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(arg1 int)
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(arg2 int)
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(arg3 float)
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(arg4 float)
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(arg5 float)
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)
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"Activate the smush! This only activates if the ongoing smush is mostly done."
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(when (>= (fabs (* 0.2 (-> obj amp)))
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(fabs (get-no-update obj))
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)
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(set! (-> obj amp) arg0)
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(set! (-> obj period) (the float arg1))
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(set! (-> obj duration) (the float arg2))
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(set! (-> obj damp-amp) arg3)
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(set! (-> obj damp-period) arg4)
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(set! (-> obj ticks) 0.0)
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(set! (-> obj start-time) (-> *display* base-frame-counter))
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)
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obj
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)
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