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;;; Starling Game Engine
;;; Copyright © 2020 David Thompson <davet@gnu.org>
;;;
;;; 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 Starling. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; OS/window system related things.
;;
;;; Code:
(define-module (starling system)
#:use-module (oop goops)
#:use-module (sdl2)
#:use-module (sdl2 video)
#:export (elapsed-time
current-window
current-window-size))
(define %time-freq (exact->inexact (sdl-performance-frequency)))
(define (elapsed-time)
"Return the current value of the system timer in seconds."
(/ (sdl-performance-counter) %time-freq))
(define current-window (make-parameter #f))
(define (current-window-size)
(window-size (current-window)))
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