Add safe round-up integer division

libs/geom/include/psemek/geom/math.hpp

@@ -165,4 +165,10 @@ namespace psemek::geom
 		return x - m * idiv(x, m);
 	}
 
+	template <typename T>
+	T div_ceil(T x, T y)
+	{
+		return (x / y) + ((x % y) == 0 ? 0 : 1);
+	}
+
 }