refactor

[guile-irrlicht.git] / src / wrapped.h

diff --git a/src/wrapped.h b/src/wrapped.h
new file mode 100644 (file)
index 0000000..2412d7e
--- /dev/null
+++ b/src/wrapped.h
@@ -0,0 +1,72 @@
+/* guile-irrlicht --- GNU Guile bindings for Irrlicht Engine
+
+   Copyright (C) 2020 Javier Sancho <jsf@jsancho.org>
+
+   This file is part of guile-irrlicht.
+
+   guile-irrlicht is free software; you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 3 of the
+   License, or (at your option) any later version.
+
+   guile-irrlicht is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with guile-irrlicht. If not, see
+   <http://www.gnu.org/licenses/>.
+*/
+
+#include <libguile.h>
+
+#define DECLARE_WRAPPED_TYPE(TYPE, INIT, PRED, WRAP, UNWRAP)            \
+  void                                                                  \
+  INIT (void);                                                          \
+                                                                        \
+  SCM                                                                   \
+  WRAP (TYPE foreign_obj);                                              \
+                                                                        \
+  TYPE                                                                  \
+  UNWRAP (SCM wrapped_obj);                                             \
+                                                                        \
+  bool                                                                  \
+  PRED (SCM wrapped_obj);
+
+
+#define DEFINE_WRAPPED_TYPE(TYPE, PRINT_NAME, INIT, PRED, WRAP, UNWRAP) \
+  static SCM wrapped_type;                                              \
+                                                                        \
+  void                                                                  \
+  INIT (void)                                                           \
+  {                                                                     \
+    SCM name, slots;                                                    \
+    scm_t_struct_finalize finalizer;                                    \
+                                                                        \
+    name = scm_from_utf8_symbol (PRINT_NAME);                           \
+    slots = scm_list_1 (scm_from_utf8_symbol ("data"));                 \
+    finalizer = NULL;                                                   \
+                                                                        \
+    wrapped_type =                                                      \
+      scm_make_foreign_object_type (name, slots, finalizer);            \
+  }                                                                     \
+                                                                        \
+  SCM                                                                   \
+  WRAP (TYPE foreign_obj)                                               \
+  {                                                                     \
+    return scm_make_foreign_object_1 (wrapped_type, foreign_obj);       \
+  }                                                                     \
+                                                                        \
+  TYPE                                                                  \
+  UNWRAP (SCM wrapped_obj)                                              \
+  {                                                                     \
+    scm_assert_foreign_object_type (wrapped_type, wrapped_obj);         \
+    return (TYPE)scm_foreign_object_ref (wrapped_obj, 0);               \
+  }                                                                     \
+                                                                        \
+  bool                                                                  \
+  PRED (SCM wrapped_obj)                                                \
+  {                                                                     \
+    return SCM_IS_A_P (wrapped_obj, wrapped_type);                      \
+  }