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+;;; 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)))