(no commit message)

[gacela.git] / gacela_misc.lisp

diff --git a/gacela_misc.lisp b/gacela_misc.lisp
index 6ebcf38ddde8e1e299c8cd68c335a22df38f17d0..419181b7680236407ec82526a376eb1e475466c9 100755 (executable)
--- 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)))