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;;
;; starlet/snap-transition.scm
;;
;; Copyright © 2021-2023 Thomas White <taw@bitwiz.org.uk>
;;
;; This file is part of Starlet.
;;
;; Starlet is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;;
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;
(define-module (starlet snap-transition)
#:use-module (starlet cue-part)
#:use-module (starlet state)
#:use-module (starlet attributes)
#:export (snap))
(define (blank-everything in-state)
(let ((out-state (make-empty-state)))
(state-for-each
(lambda (fix attr val)
(if (intensity? attr)
(set-in-state! out-state fix attr (lambda () 0.0))
(set-in-state! out-state fix attr (lambda () 'no-value))))
in-state)
out-state))
(define (snap to-state)
(cue-part
to-state
(lambda (incoming-state current-state clock)
(let ((overlay-state (blank-everything current-state)))
(state-for-each
(lambda (fix attr val)
(set-in-state! overlay-state
fix
attr
(lambda () val)))
incoming-state)
(values overlay-state 0)))))
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