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;;
;; starlet/scanout.scm
;;
;; Copyright © 2020-2023 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 scanout)
#:use-module (starlet engine)
#:use-module (starlet fixture)
#:use-module (starlet state)
#:use-module (starlet utils)
#:use-module (starlet attributes)
#:use-module (starlet guile-ola)
#:use-module (ice-9 threads)
#:use-module (ice-9 atomic)
#:use-module (ice-9 exceptions)
#:export (scanout-freq
get-attr
set-chan8
set-chan16))
(define scanout-thread #f)
(define scanout-freq 0)
(define current-scanout-fixture (make-parameter #f))
(define current-scanout-universe (make-parameter #f))
(define current-scanout-addr (make-parameter #f))
(define current-scanout-state (make-parameter (make-empty-state)))
(define (get-attr attr-name)
(let ((v (state-find (current-scanout-fixture)
attr-name
(current-scanout-state))))
(if (eq? v 'no-value)
(get-attr-home-val (current-scanout-fixture) attr-name)
v)))
(define (set-dmx universe addr value)
(ensure-number value (list universe addr value))
;; Create DMX array for universe if it doesn't exist already
(set-ola-dmx-buffer! universe
(- addr 1) ; OLA indexing starts from zero
(round-dmx value)))
(define (set-chan8 relative-channel-number value)
(ensure-number
value
(list (current-scanout-fixture)
relative-channel-number
value))
(set-dmx
(current-scanout-universe)
(+ (current-scanout-addr)
relative-channel-number
-1)
value))
(define (set-chan16 relative-channel-number value)
(ensure-number
value
(list (current-scanout-fixture)
relative-channel-number
value))
(set-chan8 relative-channel-number (msb value))
(set-chan8 (+ relative-channel-number 1) (lsb value)))
(define (scanout-loop ola-client start-time previous-universes count)
(let ((universes '()))
(parameterize
((current-scanout-state (current-value-state)))
(for-each
(lambda (fix)
;; Ensure the DMX array exists for this fixture's universe
(unless (assq (get-fixture-universe fix) universes)
(set! universes (acons (get-fixture-universe fix)
(make-ola-dmx-buffer)
universes)))
(parameterize
((current-scanout-fixture fix)
(current-scanout-universe (assq-ref
universes
(get-fixture-universe fix)))
(current-scanout-addr (get-fixture-addr fix)))
(scanout-fixture fix)))
(patched-fixtures)))
(for-each
(lambda (uni-buf-pair)
(let ((uni (car uni-buf-pair))
(buf (cdr uni-buf-pair)))
(let ((prev-buf (assv-ref previous-universes uni)))
;; Do not send exactly the same data every time,
;; but do send an update once every 100 loops, just to
;; make sure OLA does not forget about us.
(unless (and prev-buf
(ola-dmx-buffers-equal? buf prev-buf)
(not (= count 0)))
(send-streaming-dmx-data! ola-client uni buf)))))
universes)
(usleep 20000)
;; Update output rate every 1000 cycles
(if (eq? count 100)
(begin
(set! scanout-freq
(exact->inexact (/ 100
(- (hirestime) start-time))))
(scanout-loop ola-client (hirestime) universes 0))
(scanout-loop ola-client start-time universes (+ count 1)))))
(define (start-scanout)
(if scanout-thread
(format #t "Scanout thread is already running\n")
(let ((start-time (hirestime))
(ola-client (make-ola-streaming-client)))
(set! scanout-thread
(begin-thread
(with-exception-handler
(lambda (exn)
(display "Error in scanout thread:\n")
(set! scanout-thread #f)
(backtrace)
(raise-exception exn))
(lambda ()
(scanout-loop ola-client start-time '() 0))
#:unwind? #f))))))
(start-scanout)
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