diff --git a/libs/geom/include/psemek/geom/math.hpp b/libs/geom/include/psemek/geom/math.hpp
index 9a10d075..ea820d1c 100644
--- a/libs/geom/include/psemek/geom/math.hpp
+++ b/libs/geom/include/psemek/geom/math.hpp
@@ -118,4 +118,16 @@ namespace psemek::geom
 		return std::atan2(y, x);
 	}
 
+	template <typename T>
+	T idiv(T x, T m)
+	{
+		return (x >= 0) ? (x / m) : -((- x + m - 1) / m);
+	}
+
+	template <typename T>
+	T imod(T x, T m)
+	{
+		return x - m * idiv(x, m);
+	}
+
 }