Scene type and basic functions

diff --git a/gacela/scene.scm b/gacela/scene.scm
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+;;; Gacela, a GNU Guile extension for fast games development
+;;; Copyright (C) 2016 by Javier Sancho Fernandez <jsf at jsancho dot 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 (gacela scene)
+  #:use-module (srfi srfi-9)
+  #:use-module (srfi srfi-9 gnu)
+  #:export (make-scene
+           display-scene
+           run-scene))
+
+
+;;; Scene Type
+
+(define-record-type <scene>
+  (make-scene name procedure)
+  scene?
+  (name scene-name)
+  (procedure scene-procedure))
+
+(set-record-type-printer! <scene>
+  (lambda (record port)
+    (format port "#<scene ~a>" (scene-name record))))
+
+
+;;; Scene Procedures
+
+(define (display-scene scene)
+  ((scene-procedure scene)))
+
+(define (run-scene scene)
+  ((scene-procedure scene)))