Some doc

[guile-irrlicht.git] / irrlicht / foreign.scm

diff --git a/irrlicht/foreign.scm b/irrlicht/foreign.scm
index f6e203622f55db18eae8907fce38f3c26533c4dd..96cec83bd0dd04c9dfca6a5c5c5757cf07992337 100644 (file)
--- a/irrlicht/foreign.scm
+++ b/irrlicht/foreign.scm
@@ -19,8 +19,12 @@
 
 
 (define-module (irrlicht foreign)
+  #:use-module (system foreign)
   #:use-module (irrlicht base)
-  #:export (get-irrlicht-proc))
+  #:export (get-irrlicht-proc
+            null-object?
+            remember-wrapped
+            mem-wrapped))
 
 ;; We use a hash table to store foreign irrlicht methods related with their
 ;; classes
@@ -40,3 +44,22 @@
              new-proc))
           (else
            proc))))
+
+(define (null-object? object)
+  (null-pointer? (irr-pointer object)))
+
+;; Table for storing foreign irrlicht wrapped objects by its pointer address
+;; We can recover them later, when we have an address without knowing its type, like in
+;; events case
+(define wrapped-obj-table (make-hash-table))
+
+(define (remember-wrapped object)
+  (or (hash-ref wrapped-obj-table
+                (pointer-address (irr-pointer object)))
+      object))
+
+(define (mem-wrapped object)
+  (hash-set! wrapped-obj-table
+             (pointer-address (irr-pointer object))
+             object)
+  object)