X-Git-Url: https://git.jsancho.org/?a=blobdiff_plain;f=gacela_misc.lisp;h=419181b7680236407ec82526a376eb1e475466c9;hb=bf0af06a8306983f0c4fae8375dd6973e64aa593;hp=6ebcf38ddde8e1e299c8cd68c335a22df38f17d0;hpb=678a1561ca858c34fecf04792831caf68559c2ac;p=gacela.git

diff --git a/gacela_misc.lisp b/gacela_misc.lisp
index 6ebcf38..419181b 100755
--- a/gacela_misc.lisp
+++ b/gacela_misc.lisp
@@ -63,6 +63,22 @@
 	 (cond ((or (numberp list) (numberp pattern)) (and (numberp list) (numberp pattern)))
 	       (t t)))))
 
+(defun nearest-power-of-two (n)
+  (labels ((power (p n)
+		  (cond ((> (* p 2) n) p)
+			(t (power (* p 2) n)))))
+	  (power 1 n)))
+
+(defmacro mapcconst (type c-type name)
+  (let ((c-header (concatenate 'string c-type " gacela_" name " (void)"))
+	(c-body (concatenate 'string "return " name ";"))
+	(c-name (concatenate 'string "gacela_" name))
+	(lisp-name (intern (string-upcase name))))
+    `(progn
+       (defcfun ,c-header 0 ,c-body)
+       (defentry ,lisp-name () (,type ,c-name))
+       (eval-when (load) (defconstant ,lisp-name (,lisp-name))))))
+
 ;Geometry
 (defun dotp (dot)
   (match-pattern dot '(0 0)))