Added GLI for GLM tests

test/external/gli/gtx/gradient.inl

@@ -0,0 +1,74 @@
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// 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.inl
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+namespace gli{
+namespace gtx{
+namespace gradient
+{
+	inline texture2D radial
+	(
+		texture2D::dimensions_type const & Size, 
+		texture2D::texcoord_type const & Center,
+		float const & Radius,
+		texture2D::texcoord_type const & Focal
+	)
+	{
+		image2D Result(texture2D::dimensions_type(Size), gli::RGB8U);
+		glm::u8vec3 * DstData = (glm::u8vec3 *)Result.data();
+
+		for(std::size_t y = 0; y < Result.dimensions().y; ++y)
+		for(std::size_t x = 0; x < Result.dimensions().x; ++x)
+		{
+			float Value = glm::radialGradient(
+				Center * glm::vec2(Size), 
+				Radius, 
+				Focal * glm::vec2(Size),
+				glm::vec2(x, y));
+
+			std::size_t Index = x + y * Result.dimensions().x;
+
+			*(DstData + Index) = glm::u8vec3(glm::u8(glm::clamp(Value * 255.f, 0.f, 255.f)));
+		}
+
+		gli::texture2D Image(1);
+		Image[0] = Result;
+		return Image;
+	}
+
+	inline texture2D linear
+	(
+		texture2D::dimensions_type const & Size, 
+		texture2D::texcoord_type const & Point0, 
+		texture2D::texcoord_type const & Point1
+	)
+	{
+		image2D Result(texture2D::dimensions_type(Size), gli::RGB8U);
+		glm::u8vec3 * DstData = (glm::u8vec3 *)Result.data();
+
+		for(std::size_t y = 0; y < Result.dimensions().y; ++y)
+		for(std::size_t x = 0; x < Result.dimensions().x; ++x)
+		{
+			float Value = glm::linearGradient(
+				Point0 * glm::vec2(Size), 
+				Point1 * glm::vec2(Size),
+				texture2D::texcoord_type(x, y));
+
+			std::size_t Index = x + y * Result.dimensions().x;
+
+			*(DstData + Index) = glm::u8vec3(glm::u8(glm::clamp(Value * 255.f, 0.f, 255.f)));
+		}
+
+		gli::texture2D Image(1);
+		Image[0] = Result;
+		return Image;
+	}
+
+}//namespace gradient
+}//namespace gtx
+}//namespace gli