--- deliantra/server/include/util.h	2008/12/04 03:48:19	1.78
+++ deliantra/server/include/util.h	2008/12/19 22:47:29	1.79
@@ -107,6 +107,17 @@
 template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); }
 template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); }
 
+// sign returns -1 or +1
+template<typename T>
+static inline T sign (T v) { return v < 0 ? -1 : +1; }
+// relies on 2c representation
+template<>
+inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); }
+
+// sign0 returns -1, 0 or +1
+template<typename T>
+static inline T sign0 (T v) { return v ? sign (v) : 0; }
+
 // div, with correct rounding (< 0.5 downwards, >=0.5 upwards)
 template<typename T> static inline T div    (T val, T div) { return (val + div / 2) / div; }
 // div, round-up