Added GLI for GLM tests

test/external/gli/gtx/gradient.hpp

@@ -0,0 +1,38 @@
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// OpenGL Image Copyright (c) 2008 - 2011 G-Truc Creation (www.g-truc.net)
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// Created : 2008-12-19
+// Updated : 2010-01-09
+// Licence : This source is under MIT License
+// File    : gli/gtx/gradient.hpp
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+#ifndef GLI_GTX_GRADIENT_INCLUDED
+#define GLI_GTX_GRADIENT_INCLUDED
+
+#include "../gli.hpp"
+
+namespace gli{
+namespace gtx{
+namespace gradient
+{
+	texture2D radial(
+		texture2D::dimensions_type const & Size, 
+		texture2D::texcoord_type const & Center,
+		float const & Radius,
+		texture2D::texcoord_type const & Focal);
+
+	texture2D linear(
+		texture2D::dimensions_type const & Size, 
+		texture2D::texcoord_type const & Point0, 
+		texture2D::texcoord_type const & Point1);
+
+}//namespace gradient
+}//namespace gtx
+}//namespace gli
+
+namespace gli{using namespace gtx::gradient;}
+
+#include "gradient.inl"
+
+#endif//GLI_GTX_GRADIENT_INCLUDED