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(define-module (starlet playback)
#:use-module (oop goops)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-43)
#:use-module (starlet base)
#:use-module (starlet utils)
#:export (make-playback
cue
cut-to-cue-number!
run-cue-number!
go!
cue-list
cue-state))
;; A "playback" is a state which knows how to run cues
;; from a cue list
(define-class <starlet-playback> (<starlet-state>)
(cue-list
#:init-keyword #:cue-list
#:getter get-playback-cue-list)
(next-cue-index
#:init-value 0
#:getter get-next-cue-index
#:setter set-next-cue-index!)
(fade-records
#:init-form (make-hash-table)
#:getter get-fade-records
#:setter set-fade-records!))
(define-record-type <fade-record>
(make-fade-record start-time
up-time
down-time
up-delay
down-delay
previous
target)
fade-record?
(start-time fade-start-time)
(up-time fade-up-time)
(down-time fade-down-time)
(up-delay fade-up-delay)
(down-delay fade-down-delay)
(previous fade-previous)
(target fade-target))
(define-record-type <cue>
(make-cue number
state-function
realized-state
up-time
down-time
up-delay
down-delay
track-intensities)
cue?
(number get-cue-number)
(state-function get-cue-state-function)
(realized-state get-realized-state set-realized-state!)
(up-time up-time)
(up-delay up-delay)
(down-time down-time)
(down-delay down-delay)
(track-intensities track-intensities))
(define (qnum a)
(/ (inexact->exact (* a 1000)) 1000))
(define (make-playback cue-list)
(let ((new-playback (make <starlet-playback>
#:cue-list cue-list)))
new-playback))
(define (cue-number-to-index cue-list cue-number)
(vector-index (lambda (a)
(eqv? (get-cue-number a)
cue-number))
cue-list))
(define (cut-to-cue-number! pb cue-number)
(let* ((cue-list (get-playback-cue-list pb))
(cue-index (cue-number-to-index cue-list (qnum cue-number))))
(set-state-hash-table! pb (get-state-hash-table
(realize-state cue-list
cue-index)))
(set-next-cue-index! pb (+ cue-index 1))
;; Wipe out the old fade params
(set-fade-records! pb (make-hash-table))
;; Record fade params
(state-for-each
(lambda (fix attr val)
(hash-set! (get-fade-records pb)
(cons fix attr)
(make-fade-record (hirestime)
0.0
0.0
0.0
0.0
0.0
val)))
pb))
(return-unspecified))
(define (go! pb)
(let ((cue-index (get-next-cue-index pb)))
(run-cue! pb cue-index))
(return-unspecified))
(define (run-cue-number! pb cue-number)
(let ((cue-index (cue-number-to-index (get-playback-cue-list pb)
cue-number)))
(run-cue! pb cue-index))
(return-unspecified))
(define (run-cue! pb cue-index)
(let* ((cue-list (get-playback-cue-list pb)))
(unless (>= cue-index (vector-length cue-list))
(run-cue-index! pb cue-list cue-index (hirestime))
(set-next-cue-index! pb (+ cue-index 1))))
;; else at the end of the cue list
(return-unspecified))
(define (fade-func start-val end-val fade-time delay-time start-time current-time)
(let ((elapsed-fade-time (- current-time start-time delay-time)))
(cond
;; Before start of fade
((< elapsed-fade-time 0)
start-val)
;; After end of fade
((> elapsed-fade-time fade-time)
end-val)
;; During the fade
(else
(+ start-val
(* (- end-val start-val)
;; Fraction of fade time elapsed
(/ elapsed-fade-time fade-time)))))))
;; Return a function to fade from start-val to end-val using the
;; specified fade time and delay, starting at tnow
(define (wrap-fade start-val
end-val
fade-time
delay-time
tnow)
(lambda (time)
(fade-func (value->number start-val time)
(value->number end-val time)
fade-time
delay-time
tnow
time)))
;; Return a function for HTP mix of:
;; start-val fading down in down-time/down-delay
;; end-val fading up in up-time/up-delay
(define (wrap-xf start-val
end-val
up-time
down-time
up-delay
down-delay
tnow)
(lambda (time)
(max
(fade-func (value->number start-val time)
0
down-time
down-delay
tnow
time)
(fade-func 0
(value->number end-val time)
up-time
up-delay
tnow
time))))
(define (fade-start-val tnow pb old-fade-record fix attr val)
(cond
;; Attr not seen before in this playback: start fading from home
((eq? old-fade-record #f)
(home-val fix attr))
;; Attr seen in a finished fade
((fade-finished? tnow old-fade-record)
(fade-target old-fade-record))
;; Attr is currently fading: get the current state
;; (NB it might be a function/effect)
(else
(let ((func (state-find fix attr pb)))
(func tnow)))))
(define (set-fade pb fix attr fade-record)
(let ((prev-val (fade-previous fade-record))
(target (fade-target fade-record)))
(cond
;; Number to number, fading up
((and (number? target) (number? prev-val) (> target prev-val))
(set-in-state! pb fix attr (wrap-fade prev-val
target
(fade-up-time fade-record)
(fade-up-delay fade-record)
(fade-start-time fade-record))))
;; Number to number, fading down
((and (number? target) (number? prev-val) (< target prev-val))
(set-in-state! pb fix attr (wrap-fade prev-val
target
(fade-down-time fade-record)
(fade-down-delay fade-record)
(fade-start-time fade-record))))
;; Number to number, staying the same
((and (number? target) (number? prev-val))
(set-in-state! pb fix attr (wrap-fade prev-val
target
0.0
0.0
(fade-start-time fade-record))))
;; Everything else, e.g. number to effect
(else
(set-in-state! pb fix attr (wrap-xf (fade-previous fade-record)
(fade-target fade-record)
(fade-up-time fade-record)
(fade-down-time fade-record)
(fade-up-delay fade-record)
(fade-down-delay fade-record)
(fade-start-time fade-record)))))))
(define (fade-finished? tnow fade-record)
(and
(> tnow
(+ (fade-start-time fade-record)
(fade-up-delay fade-record)
(fade-up-time fade-record)))
(> tnow
(+ (fade-start-time fade-record)
(fade-down-delay fade-record)
(fade-down-time fade-record)))))
(define (run-cue-index! pb cue-list cue-number tnow)
(let ((the-cue-state (realize-state cue-list cue-number))
(the-cue (vector-ref cue-list cue-number)))
(state-for-each
(lambda (fix attr val)
(let ((fade-record (hash-ref (get-fade-records pb)
(cons fix attr))))
(let ((new-record (make-fade-record tnow
(up-time the-cue)
(down-time the-cue)
(up-delay the-cue)
(down-delay the-cue)
(fade-start-val tnow
pb
fade-record
fix
attr
val)
val)))
(hash-set! (get-fade-records pb)
(cons fix attr)
new-record)
(set-fade pb fix attr new-record))))
the-cue-state)))
;;; ******************** Cue lists ********************
(define-syntax cue-state
(syntax-rules ()
((_ body ...)
(lambda ()
body ...))))
(define* (cue number
state-function
#:key
(fade-up 5)
(fade-down 5)
(up-delay 0)
(down-delay 0)
(track-intensities #f))
(make-cue (qnum number)
state-function
#f
fade-up
fade-down
up-delay
down-delay
track-intensities))
(define (ensure-cue-zero-realized cue-list)
(unless (get-realized-state (vector-ref cue-list 0))
(set-realized-state! (vector-ref cue-list 0)
(make <starlet-state>))))
;; Get the state for a cue, taking into account tracking etc
(define (realize-state cue-list cue-index)
(ensure-cue-zero-realized cue-list)
(let* ((the-cue (vector-ref cue-list cue-index))
(rstate (get-realized-state the-cue)))
(or rstate
(let ((previous-state (realize-state cue-list (- cue-index 1))))
(parameterize ((current-state (make-empty-state)))
(apply-state previous-state)
(unless (track-intensities the-cue)
(blackout (current-state)))
((get-cue-state-function the-cue))
(set-realized-state! the-cue (current-state))
(current-state))))))
(define-syntax cue-list
(syntax-rules ()
((_ body ...)
(vector (cue 0
(lambda () #f) ;; The real base state is in ensure-cue-zero-realized
#:fade-up 0
#:fade-down 0)
body ...))))
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