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;;
;; starlet/fixture.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 fixture)
#:use-module (starlet colours)
#:use-module (oop goops)
#:use-module (srfi srfi-1)
#:export (<fixture>
get-fixture-name
get-fixture-addr
get-fixture-universe
get-fixture-attrs
find-attr
fixture?
scanout-fixture
attr-continuous
attr-list
attr-colour
get-attr-type
get-attr-range
get-attr-home-val
continuous-attribute?
colour-attribute?
intensity?
scale-to-range
round-dmx
percent->dmxval8
percent->dmxval16))
(define-class <fixture-attribute> (<object>)
(name
#:init-form (error "Attribute name must be specified")
#:init-keyword #:name
#:getter get-attr-name)
(range
#:init-value '()
#:init-keyword #:range
#:getter get-attr-range)
(type
#:init-value 'continuous
#:init-keyword #:type
#:getter get-attr-type)
(home-value
#:init-value 0
#:init-keyword #:home-value
#:getter attr-home-value))
(define-class <fixture> (<object>)
(name
#:init-form (error "Fixture name must be specified")
#:init-keyword #:name
#:getter get-fixture-name)
(universe
#:init-value #f
#:init-keyword #:uni
#:getter get-fixture-universe
#:setter set-fixture-universe!)
(start-addr
#:init-value #f
#:init-keyword #:sa
#:getter get-fixture-addr
#:setter set-fixture-addr!)
(friendly-name
#:init-value "Fixture"
#:init-keyword #:friendly-name
#:getter get-fixture-friendly-name
#:setter set-fixture-friendly-name!)
(scanout-func
#:init-value (lambda (universe start-addr value set-dmx) #f)
#:init-keyword #:scanout-func
#:getter get-scanout-func))
(define-generic scanout-fixture)
(define-syntax attr-continuous
(syntax-rules ()
((_ attr-name attr-range attr-home-value)
(make <fixture-attribute>
#:name attr-name
#:range attr-range
#:type 'continuous
#:home-value attr-home-value))))
(define-syntax attr-list
(syntax-rules ()
((_ attr-name attr-allowed-values attr-home-value)
(make <fixture-attribute>
#:name attr-name
#:range attr-allowed-values
#:type 'list
#:home-value attr-home-value))))
(define-syntax attr-colour
(syntax-rules ()
((_ attr-name attr-home-value)
(make <fixture-attribute>
#:name attr-name
#:type 'colour
#:home-value attr-home-value))))
(define (get-fixture-attrs fix)
(slot-ref fix 'attributes))
(define (fixture? f)
(is-a? f <fixture>))
(define-method (find-attr (fix <fixture>) (attr-name <symbol>))
(find (lambda (a)
(eq? (get-attr-name a)
attr-name))
(get-fixture-attrs fix)))
(define-method (find-attr (fix <fixture>) (attr-name <colour-component-id>))
(find-attr fix 'colour))
(define-method (get-attr-home-val (fix <fixture>) (attr <symbol>))
(let ((attr-obj (find-attr fix attr)))
(if attr-obj
(attr-home-value attr-obj)
'fixture-does-not-have-attribute)))
(define-method (get-attr-home-val (fix <fixture>) (attr <colour-component-id>))
(extract-colour-component
(get-attr-home-val fix 'colour)
attr))
(define (intensity? a)
(eq? 'intensity a))
(define (continuous-attribute? aobj)
(eq? 'continuous
(get-attr-type aobj)))
(define (colour-attribute? aobj)
(eq? 'colour
(get-attr-type aobj)))
;; Helper functions for fixture scanout routines
(define (percent->dmxval8 val)
(round-dmx
(scale-to-range val '(0 100) '(0 255))))
(define (percent->dmxval16 val)
(scale-to-range val '(0 100) '(0 65535)))
(define (round-dmx a)
(inexact->exact
(min 255 (max 0 (round a)))))
(define (scale-to-range val orig-range dest-range)
(define (range r)
(- (cadr r) (car r)))
(+ (car dest-range)
(* (range dest-range)
(/ (- val (car orig-range))
(range orig-range)))))
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