1 files changed, 44 insertions, 0 deletions
diff --git a/engine/scene.scm b/engine/scene.scm
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+;;; Lisp Game Jam 2018
+;;; Copyright © 2018 David Thompson <davet@gnu.org>
+;;;
+;;; This program 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 (engine scene)
+  #:use-module (chickadee audio)
+  #:use-module (engine node-2d)
+  #:use-module (oop goops)
+  #:export (<scene>
+            background-music
+            background-music-volume
+            background-music-loop?))
+
+(define-class <scene> (<node-2d>)
+  (background-music #:accessor background-music #:init-form #f
+                    #:init-keyword #:music)
+  (background-music-volume #:accessor background-music-volume #:init-form 1.0
+                           #:init-keyword #:music-volume)
+  (background-music-loop? #:accessor background-music-loop? #:init-form #t
+                          #:init-keyword #:music-loop?))
+
+(define-method (on-enter (scene <scene>))
+  (if (music? (background-music scene))
+      (begin
+        (set-music-volume! (background-music-volume scene))
+        (play-music (background-music scene)
+                    #:loop? (background-music-loop? scene)))
+      (stop-music)))
+
+(define-method (on-exit (scene <scene>))
+  (stop-music))