blob: 58c7a862dba173404168744adeaf7acd64f8b1d2 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
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!)
|
