Rename guile-2d to Sly!

Massive find/replace job.

1 files changed, 47 insertions, 0 deletions

diff --git a/sly/fps.scm b/sly/fps.scm
new file mode 100644
index 0000000..d6ff374
--- /dev/null
+++ b/sly/fps.scm
@@ -0,0 +1,47 @@
+;;; Sly
+;;; Copyright (C) 2013, 2014 David Thompson <dthompson2@worcester.edu>
+;;;
+;;; 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/>.
+
+;;; Commentary:
+;;
+;; Frames per second counter.
+;;
+;;; Code:
+
+(define-module (sly fps)
+  #:use-module (sly game)
+  #:use-module (sly signal)
+  #:export (fps))
+
+;; Current frames per second
+(define-signal fps (make-signal 0))
+
+(define accumulate-fps!
+  (let* ((elapsed-time 0)
+         (fps-counter 0))
+    (lambda (dt alpha)
+      (let ((new-time (+ elapsed-time dt))
+            (new-fps (1+ fps-counter)))
+        (if (>= new-time 1000)
+            (begin
+              (signal-set! fps new-fps)
+              (set! fps-counter 0)
+              (set! elapsed-time 0))
+            (begin
+              (set! fps-counter new-fps)
+              (set! elapsed-time new-time)))))))
+
+(add-hook! draw-hook accumulate-fps!)