1 ;;; guile-irrlicht --- FFI bindings for Irrlicht Engine
2 ;;; Copyright (C) 2019 Javier Sancho <jsf@jsancho.org>
4 ;;; This file is part of guile-irrlicht.
6 ;;; Guile-irrlicht is free software; you can redistribute it and/or modify
7 ;;; it under the terms of the GNU Lesser General Public License as
8 ;;; published by the Free Software Foundation; either version 3 of the
9 ;;; License, or (at your option) any later version.
11 ;;; Guile-irrlicht is distributed in the hope that it will be useful, but
12 ;;; WITHOUT ANY WARRANTY; without even the implied warranty of
13 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 ;;; General Public License for more details.
16 ;;; You should have received a copy of the GNU Lesser General Public
17 ;;; License along with guile-irrlicht. If not, see
18 ;;; <http://www.gnu.org/licenses/>.
21 (define-module (irrlicht util)
22 #:use-module (system foreign)
23 #:use-module (srfi srfi-9)
24 #:use-module (srfi srfi-9 gnu)
25 #:export (bool->integer
28 define-foreign-record-type))
30 (define (bool->integer var)
33 (define (integer->bool var)
36 ;; Based on guile-sdl2 function, thanks a lot
38 (let ((cirr (dynamic-link "libCIrrlicht")))
39 (lambda (return-type function-name arg-types)
40 (pointer->procedure return-type
41 (dynamic-func function-name cirr)
44 (define-syntax-rule (define-foreign name return-type func-name arg-types)
46 (irrlicht-func return-type func-name arg-types)))
48 ;; foreign struct record type
49 (define-record-type standard-foreign-record-type
50 (make-foreign-record-type name types fields)
52 (name foreign-record-type-name)
53 (types foreign-record-type-types)
54 (fields foreign-record-type-fields))
56 (define-record-type foreign-record
57 (make-foreign-record type pointer)
59 (type foreign-record-type)
60 (pointer foreign-record-pointer set-foreign-record-pointer!))
62 (set-record-type-printer! foreign-record
64 (format port "#<~a" (foreign-record-type-name (foreign-record-type record)))
65 (let* ((pointer (foreign-record-pointer record))
66 (record-type (foreign-record-type record))
67 (types (foreign-record-type-types record-type))
68 (fields (foreign-record-type-fields record-type))
69 (values (parse-c-struct pointer types)))
70 (for-each (lambda (field value)
71 (format port " ~a: ~a" field value))
76 (define-syntax define-foreign-record-type
78 (define (field-names field-specs)
79 (map (lambda (field-spec)
80 (syntax-case field-spec ()
81 ((name type getter) #'name)
82 ((name type getter setter) #'name)))
84 (define (field-types field-specs)
85 (map (lambda (field-spec)
86 (syntax-case field-spec ()
87 ((name type getter) #'type)
88 ((name type getter setter) #'type)))
91 ((_ name (make-name make-arg ...) predicate? field-spec ...)
92 (with-syntax (((type-id ...) (field-types #'(field-spec ...)))
93 ((field-name ...) (field-names #'(field-spec ...))))
96 (make-foreign-record-type
99 (list 'field-name ...)))
100 (define (make-name make-arg ...)
101 (let* ((types (foreign-record-type-types name))
102 (c-struct-pointer (make-c-struct types (list make-arg ...))))
103 (make-foreign-record name c-struct-pointer)))
104 (define (predicate? record)
106 (foreign-record? record)
107 (let* ((record-type (foreign-record-type record))
108 (type-name (foreign-record-type-name record-type)))
109 (equal? type-name (foreign-record-type-name name)))))
112 (export predicate?)))))))