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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!)