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diff --git a/src/base/GLMHelper.h b/src/base/GLMHelper.h
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+++ b/src/base/GLMHelper.h
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+//
+//  libavg - Media Playback Engine. 
+//  Copyright (C) 2003-2014 Ulrich von Zadow
+//
+//  This library is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU Lesser General Public
+//  License as published by the Free Software Foundation; either
+//  version 2 of the License, or (at your option) any later version.
+//
+//  This library is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+//  Lesser General Public License for more details.
+//
+//  You should have received a copy of the GNU Lesser General Public
+//  License along with this library; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+//  Current versions can be found at www.libavg.de
+//
+
+#ifndef _GLMHelper_H_
+#define _GLMHelper_H_
+
+#include "../api.h"
+
+#include "../glm/glm.hpp"
+#include "../glm/gtc/matrix_transform.hpp"
+#include "../glm/gtc/type_ptr.hpp"
+
+#include <iostream>
+#include <vector>
+
+namespace avg {
+
+glm::vec2 getRotated(const glm::vec2& vec, float angle);
+glm::vec2 getRotatedPivot(const glm::vec2& vec, float angle, 
+        const glm::vec2& pivot=glm::vec2(0,0));
+float getAngle(const glm::vec2& vec);
+glm::vec2 fromPolar(float angle, float radius);
+
+template<class NUM>
+bool almostEqual(const glm::detail::tvec2<NUM>& v1, const glm::detail::tvec2<NUM>& v2);
+template<class NUM>
+bool almostEqual(const glm::detail::tvec4<NUM>& v1, const glm::detail::tvec4<NUM>& v2);
+
+template<class NUM>
+std::ostream& operator<<(std::ostream& os, const glm::detail::tvec2<NUM> &v);
+template<class NUM>
+std::ostream& operator<<(std::ostream& os, const glm::detail::tvec3<NUM> &v);
+template<class NUM>
+std::ostream& operator<<(std::ostream& os, const glm::detail::tvec4<NUM> &v);
+template<class NUM>
+std::ostream& operator<<(std::ostream& os, const glm::detail::tmat4x4<NUM> &v);
+
+template<class NUM>
+std::istream& operator>>(std::istream& is, glm::detail::tvec2<NUM>& p);
+template<class NUM>
+std::istream& operator>>(std::istream& is, glm::detail::tvec3<NUM>& p);
+
+typedef glm::ivec2 IntPoint;
+typedef std::vector<glm::vec2> Vec2Vector;
+
+glm::vec2 stringToVec2(const std::string& s);
+glm::vec3 stringToVec3(const std::string& s);
+glm::ivec3 stringToIVec3(const std::string& s);
+
+}
+
+#endif