;;; guile-2d
;;; Copyright (C) 2014 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:
;;
;; SDL event handlers.
;;
;;; Code:

(define-module (2d event)
  #:use-module ((sdl sdl) #:prefix SDL:)
  #:export (process-events
            register-event-handler))

(define process-events
  (let ((e (SDL:make-event)))
    (lambda ()
      "Process all events in the input event queue."
      (while (SDL:poll-event e)
        (handle-event e)))))

(define event-handlers (make-hash-table))

(define (register-event-handler event-type proc)
  (hashq-set! event-handlers event-type proc))

(define (handle-event e)
  "Run the relevant hook for the event E."
  (let ((handle (hashq-get-handle event-handlers (SDL:event:type e))))
    (when handle
      ((cdr handle) e))))