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-rw-r--r--2d/scene.scm52
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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))