From ad8509243347e8e3abce1031cfaade2f382599c9 Mon Sep 17 00:00:00 2001
From: SiliconKiwi <ibaxter@gmail.com>
Date: Tue, 16 Sep 2014 09:09:39 +1200
Subject: [PATCH 1/2] Update closest_point.hpp

Algorithm works fine with 2d points as well...
---
 glm/gtx/closest_point.hpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/glm/gtx/closest_point.hpp b/glm/gtx/closest_point.hpp
index d0f17155..eb893291 100644
--- a/glm/gtx/closest_point.hpp
+++ b/glm/gtx/closest_point.hpp
@@ -56,6 +56,13 @@ namespace glm
 		detail::tvec3<T, P> const & point,
 		detail::tvec3<T, P> const & a, 
 		detail::tvec3<T, P> const & b);
+	
+	/// 2d lines work as well	
+	template <typename T, precision P>
+	GLM_FUNC_DECL detail::tvec2<T, P> closestPointOnLine(
+		detail::tvec2<T, P> const & point,
+		detail::tvec2<T, P> const & a, 
+		detail::tvec2<T, P> const & b);	
 
 	/// @}
 }// namespace glm

From b5409fb728867427a385185800fc9fc9d8b7a651 Mon Sep 17 00:00:00 2001
From: SiliconKiwi <ibaxter@gmail.com>
Date: Tue, 16 Sep 2014 09:11:34 +1200
Subject: [PATCH 2/2] Update closest_point.inl

---
 glm/gtx/closest_point.inl | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/glm/gtx/closest_point.inl b/glm/gtx/closest_point.inl
index b13370b2..889b75b1 100644
--- a/glm/gtx/closest_point.inl
+++ b/glm/gtx/closest_point.inl
@@ -28,4 +28,25 @@ namespace glm
 		if(Distance >= LineLength) return b;
 		return a + LineDirection * Distance;
 	}
+	
+	template <typename T, precision P>
+	GLM_FUNC_QUALIFIER detail::tvec2<T, P> closestPointOnLine
+	(
+		detail::tvec2<T, P> const & point,
+		detail::tvec2<T, P> const & a,
+		detail::tvec2<T, P> const & b
+	)
+	{
+		T LineLength = distance(a, b);
+		detail::tvec2<T, P> Vector = point - a;
+		detail::tvec2<T, P> LineDirection = (b - a) / LineLength;
+
+		// Project Vector to LineDirection to get the distance of point from a
+		T Distance = dot(Vector, LineDirection);
+
+		if(Distance <= T(0)) return a;
+		if(Distance >= LineLength) return b;
+		return a + LineDirection * Distance;
+	}
+	
 }//namespace glm