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;;
;; starlet/midi-control/faders.scm
;;
;; Copyright © 2020-2021 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 midi-control faders)
#:use-module (starlet midi-control base)
#:use-module (starlet state)
#:use-module (starlet fixture)
#:use-module (starlet colours)
#:use-module (starlet scanout)
#:use-module (starlet utils)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (oop goops)
#:export (set-midi-control-map!
state-on-fader))
(define-class <parameter-controller> (<object>)
(callbacks
#:init-keyword #:callbacks
#:getter get-callbacks
#:setter set-callbacks!)
(control-map
#:init-keyword #:control-map
#:getter get-control-map))
(define (name-for-fader-state controller cc-number)
(call-with-output-string
(lambda (port)
(format port "faderstate-~a-cc~a"
controller
cc-number))))
(define* (state-on-fader controller
cc-number
state)
(register-state!
(lighting-state
(state-for-each
(lambda (fix attr val)
(at fix attr
(lambda ()
(let ((cc-val (get-cc-value controller cc-number)))
;; Fader position known?
(if cc-val
(if (intensity? attr)
;; Intensity parameters get scaled according to the fader
(* 0.01 val (ccval->percent cc-val))
;; Non-intensity parameters just get set in our new state,
;; but only if the fader is up!
(if (> cc-val 0)
val
'no-value))
;; Fader position unknown
'no-value)))))
state))
#:unique-name (name-for-fader-state controller cc-number)))
(define (current-values fixture-list attr-name)
(map (lambda (fix)
(current-value fix attr-name))
fixture-list))
(define (fixtures-with-attr fixture-list attr-name)
(let ((attrs (map (cut find-attr <> attr-name) fixture-list)))
(fold (lambda (fix attr old)
(if attr
(cons (cons fix (car old))
(cons attr (cdr old)))
old))
(cons '() '())
fixture-list attrs)))
(define (clamp-to-attr-range attr-obj val)
(let ((r (get-attr-range-maybe-colour attr-obj)))
(max (car r)
(min (cadr r)
val))))
(define (attr-scale controller attr)
(let ((sens-level (get-controller-sensitivity controller)))
(cond
((= sens-level 1) 0.02)
((= sens-level 2) 0.1)
((= sens-level 3) 0.5)
((= sens-level 4) 1.5)
((= sens-level 5) 3.0))))
(define* (at-midi-jogwheel controller
fixture-list
attr
cc-number
#:key (led #f))
(define (ccval->offset controller a)
(if (eq? a 127)
(- (attr-scale controller attr))
(attr-scale controller attr)))
(let ((fixtures (car (fixtures-with-attr fixture-list attr))))
(unless (null? fixtures)
(when led
(send-note-on controller led))
(let ((old-vals (current-values fixtures attr))
(offset 0))
(register-midi-cc-callback!
controller
#:cc-number cc-number
#:func (lambda (prev-cc-val new-cc-value)
(set! offset (+ offset (ccval->offset controller
new-cc-value)))
(for-each (lambda (fix old-val)
(let ((attr-obj (find-attr fix attr)))
(when (and attr-obj
(continuous-attribute? attr-obj))
(set-in-state! programmer-state
fix
attr
(clamp-to-attr-range
attr-obj
(+ old-val offset))
controller))))
fixtures old-vals)))))))
(define (get-attr-range-maybe-colour attr-obj)
(if (colour-attribute? attr-obj)
'(0 100)
(get-attr-range attr-obj)))
(define (fader-congruent vals attrs)
(mean (map (lambda (val attr)
(scale-to-range val
(get-attr-range-maybe-colour attr)
'(0 127)))
vals attrs)))
(define (fader-up-gradients initial-vals
attrs
congruent-val)
(map (lambda (initial-val attr)
(let ((attr-max (cadr (get-attr-range-maybe-colour attr))))
(if (< congruent-val 127)
(/ (- attr-max initial-val)
(- 127 congruent-val))
0)))
initial-vals
attrs))
(define (fader-down-gradients initial-vals
attrs
congruent-val)
(map (lambda (initial-val attr)
(let ((attr-min (car (get-attr-range-maybe-colour attr))))
(if (> congruent-val 0)
(/ (- initial-val attr-min)
congruent-val)
0)))
initial-vals
attrs))
(define (apply-fader cc-offset
attr-name
gradients
initial-vals
fixtures
controller)
(for-each (lambda (fix initial-val gradient)
(when (colour-component-id? attr-name)
(set-in-state!
programmer-state
fix
'colour
(current-value fix 'colour)
controller))
(set-in-state! programmer-state
fix
attr-name
(+ initial-val
(* gradient cc-offset))
controller))
fixtures
initial-vals
gradients))
(define* (at-midi-fader controller
fixture-list
attr-name
cc-number
#:key
(led-incongruent #f)
(led #f))
(let ((fixtures-attrs (fixtures-with-attr fixture-list attr-name)))
(unless (null? (car fixtures-attrs))
(let* ((fixtures (car fixtures-attrs))
(attrs (cdr fixtures-attrs))
(initial-vals (current-values fixtures attr-name))
(congruent-val (fader-congruent initial-vals attrs))
(up-gradients (fader-up-gradients initial-vals attrs congruent-val))
(dn-gradients (fader-down-gradients initial-vals attrs congruent-val))
(cc-val (get-cc-value controller cc-number))
(congruent (and cc-val (= cc-val congruent-val))))
(if congruent
(send-note-on controller led)
(send-note-on controller led-incongruent))
(register-midi-cc-callback!
controller
#:cc-number cc-number
#:func (lambda (prev-cc-val new-cc-value)
(if congruent
(cond
((> new-cc-value congruent-val)
(apply-fader (- new-cc-value congruent-val)
attr-name
up-gradients
initial-vals
fixtures
controller))
((<= new-cc-value congruent-val)
(apply-fader (- new-cc-value congruent-val)
attr-name
dn-gradients
initial-vals
fixtures
controller)))
(when (or (and (not prev-cc-val)
(= new-cc-value congruent-val))
(and prev-cc-val new-cc-value
(in-range congruent-val
prev-cc-val
new-cc-value)))
(set! congruent #t)
(send-note-on controller led)))))))))
(define (midi-control-attr controller control-spec fixture-list)
(cond
((eq? 'jogwheel (cadr control-spec))
(at-midi-jogwheel controller
fixture-list
(car control-spec)
(caddr control-spec)
#:led (cadddr control-spec)))
((eq? 'fader (cadr control-spec))
(at-midi-fader controller
fixture-list
(car control-spec)
(caddr control-spec)
#:led (car (cadddr control-spec))
#:led-incongruent (cadr (cadddr control-spec))))))
(define (led-off controller leds)
(cond
((list? leds)
(for-each (lambda (note)
(send-note-off controller note))
leds))
((number? leds)
(send-note-off controller leds))))
(define (scrub-parameter-controller! controller parameter-controller)
;; Remove all the old callbacks
(for-each (lambda (callback)
(remove-midi-callback! controller callback))
(get-callbacks parameter-controller))
;; Switch off all the old LEDs
(for-each (lambda (control-spec)
(led-off controller (cadddr control-spec)))
(get-control-map parameter-controller)))
(define (update-midi-controls controller fixture-list)
(scrub-parameter-controller! controller
(get-parameter-controller controller))
(set-callbacks!
(get-parameter-controller controller)
(map (lambda (control-spec)
(midi-control-attr controller control-spec fixture-list))
(get-control-map (get-parameter-controller controller)))))
(define (set-midi-control-map! controller new-control-map)
(when controller
(let ((old-parameter-controller (get-parameter-controller controller)))
;; Remove the old parameter controller
(when old-parameter-controller
(scrub-parameter-controller! controller old-parameter-controller))
(set-parameter-controller!
controller
(make <parameter-controller>
#:callbacks '()
#:control-map new-control-map))
;; If this is the first time, add the callbacks
(unless old-parameter-controller
;; Selection changed
(add-hook!
selection-hook
(lambda (fixture-list)
(update-midi-controls controller fixture-list)))
;; Value changed
(add-update-hook! programmer-state
(lambda (fix attr value source)
(unless (eq? source controller)
(update-midi-controls controller (get-selection))))))
;; If there is a selection, run the callback now
(let ((current-selection (get-selection)))
(when current-selection
(update-midi-controls controller current-selection))))))
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