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| -rw-r--r-- | 2d/fps.scm | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/2d/fps.scm b/2d/fps.scm new file mode 100644 index 0000000..58c7a86 --- /dev/null +++ b/2d/fps.scm @@ -0,0 +1,48 @@ +;;; 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: +;; +;; Frames per second counter. +;; +;;; Code: + +(define-module (2d fps) + #:use-module (2d game) + #:export (fps)) + +;; Current frames per second +(define fps (make-parameter 0)) + +(define accumulate-fps! + (let* ((elapsed-time 0) + (fps-counter 0)) + (lambda (dt alpha) + "Increment the frames-per-second counter. Resets to 0 every +second." + (let ((new-time (+ elapsed-time dt)) + (new-fps (1+ fps-counter))) + (if (>= new-time 1000) + (begin + (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!) |