Added GLI for GLM tests

test/external/gli/core/operator.hpp

@@ -0,0 +1,28 @@
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// OpenGL Image Copyright (c) 2008 - 2011 G-Truc Creation (www.g-truc.net)
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// Created : 2010-01-19
+// Updated : 2010-01-19
+// Licence : This source is under MIT License
+// File    : gli/core/operator.hpp
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+#ifndef GLI_OPERATOR_INCLUDED
+#define GLI_OPERATOR_INCLUDED
+
+#include "texture2d.hpp"
+
+namespace gli{
+namespace detail
+{
+
+}//namespace detail
+
+	texture2D operator+(texture2D const & TextureA, texture2D const & TextureB);
+	texture2D operator-(texture2D const & TextureA, texture2D const & TextureB);
+
+}//namespace gli
+
+#include "operator.inl"
+
+#endif//GLI_OPERATOR_INCLUDED