;;; 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 bindings utils)
  #:use-module (sdl3 config)
  #:use-module (sdl3 guardian)
  #:use-module (srfi srfi-9)
  #:use-module (srfi srfi-9 gnu)
  #:use-module (system foreign)
  #:use-module (system foreign-library)
  #:export (bool
            define-sdl
            define-sdl-pointer-type))

;; Type aliases:
(define bool uint8)

(define-syntax define-sdl
  (lambda (stx)
    (syntax-case stx (->)
      ((_ name arg-type ... -> return-type)
       #`(define name
           (foreign-library-function %libsdl3
                                     #,(symbol->string (syntax->datum #'name))
                                     #:arg-types (list arg-type ...)
                                     #:return-type return-type)))
      ((_ name arg-type ...)
       #'(define-sdl name arg-type ... -> void)))))

(define-syntax-rule (define-sdl-pointer-type name
                      pred wrap unwrap
                      destroyed-pred set-destroyed
                      print)
  (begin
    (define-record-type name
      (ctor ptr)
      pred
      (ptr unwrap)
      (destroyed? destroyed-pred set-destroyed))
    (define (wrap ptr)
      (sdl-protect (ctor ptr)))
    (set-record-type-printer! name print)))