1 files changed, 58 insertions, 0 deletions
diff --git a/src/glm/gtx/vector_angle.inl b/src/glm/gtx/vector_angle.inl
new file mode 100644
index 0000000..658d185
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+++ b/src/glm/gtx/vector_angle.inl
@@ -0,0 +1,58 @@
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// OpenGL Mathematics Copyright (c) 2005 - 2011 G-Truc Creation (www.g-truc.net)
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// Created : 2005-12-30
+// Updated : 2008-09-29
+// Licence : This source is under MIT License
+// File    : glm/gtx/vector_angle.inl
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+namespace glm{
+namespace gtx{
+namespace vector_angle{
+
+template <typename genType> 
+GLM_FUNC_QUALIFIER typename genType::value_type angle
+(
+	genType const & x, 
+	genType const & y
+)
+{
+	return degrees(acos(dot(x, y)));
+}
+
+//! \todo epsilon is hard coded to 0.01
+template <typename valType> 
+GLM_FUNC_QUALIFIER valType orientedAngle
+(
+	detail::tvec2<valType> const & x, 
+	detail::tvec2<valType> const & y
+)
+{
+    valType Angle = glm::degrees(acos(dot(x, y)));
+	detail::tvec2<valType> TransformedVector = glm::gtx::rotate_vector::rotate(x, Angle);
+    if(all(equalEpsilon(y, TransformedVector, valType(0.01))))
+		return Angle;
+    else
+        return -Angle;
+}
+
+template <typename valType>
+GLM_FUNC_QUALIFIER valType orientedAngle
+(
+	detail::tvec3<valType> const & x,
+	detail::tvec3<valType> const & y,
+	detail::tvec3<valType> const & ref
+)
+{
+	valType Angle = glm::degrees(glm::acos(glm::dot(x, y)));
+
+	if(glm::dot(ref, glm::cross(x, y)) < valType(0))
+		return -Angle;
+	else
+		return Angle;
+}
+
+}//namespace vector_angle
+}//namespace gtx
+}//namespace glm