Merge pull request #4 from FOSSEE/develop

merging dev into master

1 files changed, 43 insertions, 0 deletions

diff --git a/include/gal/opengl/glm/gtx/gradient_paint.inl b/include/gal/opengl/glm/gtx/gradient_paint.inl
new file mode 100644
index 0000000..bdf5a65
--- /dev/null
+++ b/include/gal/opengl/glm/gtx/gradient_paint.inl
@@ -0,0 +1,43 @@
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// OpenGL Mathematics Copyright (c) 2005 - 2013 G-Truc Creation (www.g-truc.net)
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// Created : 2009-03-06
+// Updated : 2009-03-09
+// Licence : This source is under MIT License
+// File    : glm/gtx/gradient_paint.inl
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+namespace glm
+{
+	template <typename valType>
+	valType radialGradient
+	(
+		detail::tvec2<valType> const & Center,
+		valType const & Radius,
+		detail::tvec2<valType> const & Focal,
+		detail::tvec2<valType> const & Position
+	)
+	{
+		detail::tvec2<valType> F = Focal - Center;
+		detail::tvec2<valType> D = Position - Focal;
+		valType Radius2 = pow2(Radius);
+		valType Fx2 = pow2(F.x);
+		valType Fy2 = pow2(F.y);
+
+		valType Numerator = (D.x * F.x + D.y * F.y) + sqrt(Radius2 * (pow2(D.x) + pow2(D.y)) - pow2(D.x * F.y - D.y * F.x));
+		valType Denominator = Radius2 - (Fx2 + Fy2);
+		return Numerator / Denominator;
+	}
+
+	template <typename valType>
+	valType linearGradient
+	(
+		detail::tvec2<valType> const & Point0,
+		detail::tvec2<valType> const & Point1,
+		detail::tvec2<valType> const & Position
+	)
+	{
+		detail::tvec2<valType> Dist = Point1 - Point0;
+		return (Dist.x * (Position.x - Point0.x) + Dist.y * (Position.y - Point0.y)) / glm::dot(Dist, Dist);
+	}
+}//namespace glm