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-1)
24 #:use-module (srfi srfi-9)
25 #:use-module (srfi srfi-9 gnu)
26 #:export (bool->integer
29 define-foreign-record-type))
31 (define (bool->integer var)
34 (define (integer->bool var)
37 ;; Based on guile-sdl2 function, thanks a lot
39 (let ((cirr (dynamic-link "libCIrrlicht")))
40 (lambda (return-type function-name arg-types)
41 (pointer->procedure return-type
42 (dynamic-func function-name cirr)
45 (define-syntax-rule (define-foreign name return-type func-name arg-types)
47 (irrlicht-func return-type func-name arg-types)))
49 ;; foreign struct record type
50 (define-record-type standard-foreign-record-type
51 (make-foreign-record-type name types fields)
53 (name foreign-record-type-name)
54 (types foreign-record-type-types)
55 (fields foreign-record-type-fields))
57 (define-record-type foreign-record
58 (make-foreign-record type pointer)
60 (type foreign-record-type)
61 (pointer foreign-record-pointer set-foreign-record-pointer!))
63 (set-record-type-printer! foreign-record
65 (format port "#<~a" (foreign-record-type-name (foreign-record-type record)))
66 (let* ((pointer (foreign-record-pointer record))
67 (record-type (foreign-record-type record))
68 (types (foreign-record-type-types record-type))
69 (fields (foreign-record-type-fields record-type))
70 (values (parse-c-struct pointer types)))
71 (for-each (lambda (field value)
72 (format port " ~a: ~a" field value))
77 (define-syntax define-foreign-record-type
79 (define (field-names field-specs)
80 (map (lambda (field-spec)
81 (syntax-case field-spec ()
82 ((name type getter) #'name)
83 ((name type getter setter) #'name)))
86 (define (field-types field-specs)
87 (map (lambda (field-spec)
88 (syntax-case field-spec ()
89 ((name type getter) #'type)
90 ((name type getter setter) #'type)))
93 (define (field-getters field-specs)
94 (map (lambda (field-spec field-id)
95 (syntax-case field-spec ()
96 ((name type getter) (list #'getter field-id))
97 ((name type getter setter) (list #'getter field-id))))
99 (iota (length field-specs))))
101 (define (field-setters field-specs)
102 (filter-map (lambda (field-spec field-id)
103 (syntax-case field-spec ()
104 ((name type getter) #f)
105 ((name type getter setter) (list #'setter field-id))))
107 (iota (length field-specs))))
110 ((_ name (make-name make-arg ...) predicate? field-spec ...)
111 (with-syntax (((type-id ...) (field-types #'(field-spec ...)))
112 ((field-name ...) (field-names #'(field-spec ...)))
113 (((getter getter-id) ...) (field-getters #'(field-spec ...)))
114 (((setter setter-id) ...) (field-setters #'(field-spec ...))))
117 (make-foreign-record-type
120 (list 'field-name ...)))
122 (define (make-name make-arg ...)
123 (let* ((types (foreign-record-type-types name))
124 (c-struct-pointer (make-c-struct types (list make-arg ...))))
125 (make-foreign-record name c-struct-pointer)))
127 (define (predicate? record)
129 (foreign-record? record)
130 (let* ((record-type (foreign-record-type record))
131 (type-name (foreign-record-type-name record-type)))
132 (equal? type-name (foreign-record-type-name name)))))
134 (define (getter record)
135 (let* ((pointer (foreign-record-pointer record))
136 (record-type (foreign-record-type record))
137 (types (foreign-record-type-types record-type))
138 (values (parse-c-struct pointer types)))
139 (list-ref values getter-id)))
142 (define (setter record new-value)
143 (let* ((pointer (foreign-record-pointer record))
144 (record-type (foreign-record-type record))
145 (types (foreign-record-type-types record-type))
146 (values (parse-c-struct pointer types)))
147 (list-set! values setter-id new-value)
148 (set-foreign-record-pointer! record (make-c-struct types values))