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;;; guile-2d
;;; 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 (2d fps)
#:use-module (2d game)
#:use-module (2d 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!)
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