;;; guile-sdl3 -- Scheme bindings for SDL3
;;; Copyright © 2024 David Thompson <dthompson2@worcester.edu>
;;;
;;; Licensed under the Apache License, Version 2.0 (the "License");
;;; you may not use this file except in compliance with the License.
;;; You may obtain a copy of the License at
;;;
;;;    http://www.apache.org/licenses/LICENSE-2.0
;;;
;;; Unless required by applicable law or agreed to in writing, software
;;; distributed under the License is distributed on an "AS IS" BASIS,
;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;;; See the License for the specific language governing permissions and
;;; limitations under the License.

;;; Commentary:
;;
;; Low-level FFI binding utilities.
;;
;;; Code:

(define-module (sdl3 events)
  #:use-module (bstruct)
  #:use-module (sdl3 bindings events)
  #:use-module (system foreign)
  #:export (event?
            event-type
            poll-event))

(define (make-event)
  (bstruct-alloc SDL_Event))

(define (event? obj)
  (bstruct? SDL_Event obj))

(define (event-type event)
  (event-type->symbol (bstruct-ref SDL_Event event type)))

(define (poll-event)
  (and (eq? (SDL_PollEvent %null-pointer) 1)
       (let ((event (make-event)))
         (SDL_PollEvent (bstruct->pointer SDL_Event event))
         event)))