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diff --git a/2d/game-loop.scm b/2d/game-loop.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:
-;;
-;; Game loop.
-;;
-;;; Code:
-
-(define-module (2d game-loop)
-  #:use-module (ice-9 match)
-  #:use-module (srfi srfi-2)
-  #:use-module (srfi srfi-11)
-  #:use-module ((sdl sdl) #:prefix SDL:)
-  #:use-module (figl gl)
-  #:use-module (2d agenda)
-  #:use-module (2d coroutine)
-  #:use-module (2d game)
-  #:use-module (2d mvars)
-  #:use-module (2d repl server)
-  #:use-module (2d repl repl)
-  #:use-module (2d scene)
-  #:use-module (2d stage)
-  #:use-module (2d window)
-  #:export (current-fps
-            run-game
-            quit-game
-            pause-game
-            resume-game
-            game-running?
-            game-paused?))
-
-;;;
-;;; Game Loop
-;;;
-
-(define running? #f)
-(define paused? #f)
-
-(define (update-and-render stage dt accumulator)
-  (let ((remainder (update stage accumulator)))
-    (run-repl)
-    (render stage dt)
-    remainder))
-
-(define (tick dt accumulator)
-  "Advance the game by one frame."
-  (if paused?
-      (begin
-        (run-repl)
-        (SDL:delay tick-interval)
-        accumulator)
-      (catch #t
-        (lambda ()
-          (let ((stage (current-stage)))
-            (if stage
-                (update-and-render stage dt accumulator)
-                (quit-game))))
-        (lambda (key . args)
-          (pause-game)
-          accumulator)
-        (lambda (key . args)
-          (display-backtrace (make-stack #t)
-                             (current-output-port))))))
-
-(define (game-loop last-time accumulator)
-  "Update game state, and render. LAST-TIME is the time in
-milliseconds of the last iteration of the loop. ACCUMULATOR is the
-time in milliseconds that has passed since the last game update."
-  (when running?
-    (let* ((current-time (SDL:get-ticks))
-           (dt (- current-time last-time))
-           (accumulator (+ accumulator dt)))
-      (game-loop current-time (tick dt accumulator)))))
-
-(define (run-game game)
-  "Open a window and start the game loop for GAME."
-  (open-window (game-title game)
-               (game-resolution game)
-               (game-fullscreen? game))
-  (set! running? #t)
-  (resume-game)
-  (push-scene (game-first-scene game))
-  (spawn-server)
-  (game-loop (SDL:get-ticks) 0)
-  (close-window))
-
-(define (game-running?)
-  (running?))
-
-(define (game-paused?)
-  (paused?))
-
-(define (pause-game)
-  "Pauses the game loop. Useful when developing."
-  (set! paused? #t))
-
-(define (resume-game)
-  "Resumes the game loop."
-  (set! paused? #f))
-
-(define (quit-game)
-  "Finish the current frame and terminate the game loop."
-  (set! running? #f))
-
-;;;
-;;; Constants
-;;;
-
-(define target-fps 60)
-(define tick-interval (floor (/ 1000 target-fps)))
-
-;;;
-;;; Event Handling
-;;;
-
-;; By default, pressing the escape key will pop the current scene, and
-;; closing the window will quit the game.
-(default-events `((key-down . ,(lambda (state key mod unicode)
-                                 (when (eq? key 'escape)
-                                   (pop-scene))))
-                  (quit . ,(lambda (state)
-                             (quit-game)))))
-
-(define handle-events
-  (let ((e (SDL:make-event)))
-    (lambda (stage)
-      "Handle all events in the SDL event queue."
-      (while (SDL:poll-event e)
-        (handle-event stage e)))))
-
-(define (handle-event stage e)
-  "Call the relevant callbacks for the event, E."
-  (case (SDL:event:type e)
-    ((active)
-     (stage-trigger stage 'active))
-    ((video-resize)
-     (stage-trigger stage
-                    'resize
-                    (SDL:event:resize:w e)
-                    (SDL:event:resize:h e)))
-    ((quit)
-     (stage-trigger stage 'quit))
-    ((key-down)
-     (stage-trigger stage
-                    'key-down
-                    (SDL:event:key:keysym:sym e)
-                    (SDL:event:key:keysym:mod e)
-                    (SDL:event:key:keysym:unicode e)))
-    ((key-up)
-     (stage-trigger stage
-                    'key-up
-                    (SDL:event:key:keysym:sym e)
-                    (SDL:event:key:keysym:mod e)
-                    (SDL:event:key:keysym:unicode e)))
-    ((mouse-motion)
-     (stage-trigger stage
-                    'mouse-motion
-                    (SDL:event:motion:state e)
-                    (SDL:event:motion:x e)
-                    (SDL:event:motion:y e)
-                    (SDL:event:motion:xrel e)
-                    (SDL:event:motion:yrel e)))
-    ((mouse-button-down)
-     (stage-trigger stage
-                    'mouse-press
-                    (SDL:event:button:button e)
-                    (SDL:event:button:x e)
-                    (SDL:event:button:y e)))
-    ((mouse-button-up)
-     (stage-trigger stage
-                    'mouse-click
-                    (SDL:event:button:button e)
-                    (SDL:event:button:x e)
-                    (SDL:event:button:y e)))))
-
-;;;
-;;; Frames Per Second
-;;;
-
-(define game-fps 0)
-
-(define accumulate-fps!
-  (let* ((elapsed-time 0)
-         (fps 0))
-    (lambda (dt)
-      "Increment the frames-per-second counter. Resets to 0 every
-second."
-      (let ((new-time (+ elapsed-time dt))
-            (new-fps (1+ fps)))
-        (if (>= new-time 1000)
-            (begin
-              (set! game-fps new-fps)
-              (set! fps 0)
-              (set! elapsed-time 0))
-            (begin
-              (set! fps new-fps)
-              (set! elapsed-time new-time)))))))
-
-(define (current-fps)
-  "Return the current FPS value."
-  game-fps)
-
-;;;
-;;; Update and Render
-;;;
-
-(define (render stage dt)
-  "Render a frame."
-  (set-gl-matrix-mode (matrix-mode modelview))
-  (gl-load-identity)
-  (gl-clear (clear-buffer-mask color-buffer depth-buffer))
-  (draw-stage stage)
-  (SDL:gl-swap-buffers)
-  (accumulate-fps! dt))
-
-(define (update stage accumulator)
-  "Call the update callback. The update callback will be called as
-many times as `tick-interval` can divide ACCUMULATOR. The return value
-is the unused accumulator time."
-  (if (>= accumulator tick-interval)
-      (begin
-        (handle-events stage)
-        (update-agenda)
-        (update-stage stage)
-        (update stage (- accumulator tick-interval)))
-      accumulator))
-
-;;;
-;;; REPL
-;;;
-
-(define (run-repl-thunk thunk input output error stack)
-  "Run THUNK with the given REPL STACK. I/O is redirected to the given
-INPUT, OUTPUT, and ERROR ports."
-  (put-mvar
-   repl-output-mvar
-   (with-input-from-port input
-     (lambda ()
-       (with-output-to-port output
-         (lambda ()
-           (with-error-to-port error
-             (lambda ()
-               (with-fluids ((*repl-stack* stack))
-                 (thunk))))))))))
-
-(define (run-repl)
-  "Execute a thunk from the REPL is there is one."
-  (unless (mvar-empty? repl-input-mvar)
-    (and-let* ((vals (try-take-mvar repl-input-mvar)))
-              (apply run-repl-thunk vals))))