Add scene module.

1 files changed, 52 insertions, 0 deletions

diff --git a/2d/scene.scm b/2d/scene.scm
new file mode 100644
index 0000000..9560379
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+++ b/2d/scene.scm
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+;;; guile-2d
+;;; Copyright (C) 2013 David Thompson <dthompson2@worcester.edu>
+;;;
+;;; Guile-2d is free software: you can redistribute it and/or modify it
+;;; under the terms of the GNU Lesser General Public License as
+;;; published by the Free Software Foundation, either version 3 of the
+;;; License, or (at your option) any later version.
+;;;
+;;; Guile-2d 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
+;;; Lesser General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU Lesser General Public
+;;; License along with this program.  If not, see
+;;; <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;
+;; Scenes describe the behavioral aspects of a game.
+;;
+;;; Code:
+
+(define-module (2d scene)
+  #:use-module (srfi srfi-9)
+  #:export (make-scene
+            scene?
+            scene-init
+            scene-enter
+            scene-exit
+            scene-draw
+            scene-update))
+
+(define-record-type <scene>
+  (%make-scene init enter exit draw update)
+  scene?
+  (init scene-init)
+  (enter scene-enter)
+  (exit scene-exit)
+  (draw scene-draw)
+  (update scene-update))
+
+(define no-op (lambda args #f))
+
+(define* (make-scene #:optional #:key
+                     (init no-op)
+                     (enter no-op)
+                     (exit no-op)
+                     (draw no-op)
+                     (update no-op))
+  "Create a new scene object. All callbacks default to a no-op."
+  (%make-scene init enter exit draw update))