1 ;;; Gacela, a GNU Common Lisp 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/>.
18 (eval-when (compile load eval)
19 (when (not (find-package 'gacela)) (make-package 'gacela :nicknames '(gg) :use '(lisp)))
20 (in-package 'gacela :nicknames '(gg) :use '(lisp)))
25 (defstruct timer (start 0) (paused 0) (state 'stopped))
27 (defun start-timer (timer)
28 (setf (timer-start timer) (SDL_GetTicks))
29 (setf (timer-state timer) 'running))
31 (defun stop-timer (timer)
32 (setf (timer-state timer) 'stopped))
34 (defun get-time (timer)
35 (cond ((eq (timer-state timer) 'stopped) 0)
36 ((eq (timer-state timer) 'paused) (timer-paused timer))
37 (t (- (SDL_GetTicks) (timer-start timer)))))
39 (defun pause-timer (timer)
40 (cond ((eq (timer-state timer) 'running)
41 (setf (timer-paused timer) (- (SDL_GetTicks) (timer-start timer)))
42 (setf (timer-state timer) 'paused))))
44 (defun resume-timer (timer)
45 (cond ((eq (timer-state timer) 'paused)
46 (setf (timer-start timer) (- (SDL_GetTicks) (timer-paused timer)))
47 (setf (timer-state timer) 'running))))