1 ;;; Gacela, a GNU Guile extension for fast games development
2 ;;; Copyright (C) 2009 by Javier Sancho Fernandez <jsf at jsancho dot org>
4 ;;; This program is free software: you can redistribute it and/or modify
5 ;;; it under the terms of the GNU General Public License as published by
6 ;;; the Free Software Foundation, either version 3 of the License, or
7 ;;; (at your option) any later version.
9 ;;; This program is distributed in the hope that it will be useful,
10 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
11 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 ;;; GNU General Public License for more details.
14 ;;; You should have received a copy of the GNU General Public License
15 ;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
21 (let ((start 0) (paused 0) (state 'stopped))
23 (cond ((eq? op 'start-timer)
24 (set! start (SDL_GetTicks))
25 (set! state 'running))
28 (set! state 'stopped))
31 (cond ((eq? state 'stopped) 0)
32 ((eq? state 'paused) paused)
33 (else (- (SDL_GetTicks) start))))
38 ((eq? op 'pause-timer)
39 (cond ((eq? state 'running)
40 (set! paused (- (SDL_GetTicks) start))
41 (set! state 'paused))))
43 ((eq? op 'resume-timer)
44 (cond ((eq? state 'paused)
45 (set! start (- (SDL_GetTicks) paused))
46 (set! state 'running))))))))
48 (define (start-timer timer)
51 (define (stop-timer timer)
54 (define (get-time timer)
57 (define (get-state timer)
60 (define (pause-timer timer)
63 (define (resume-timer timer)
64 (timer 'resume-timer))