Merge pull request g-truc#1079 from BramblePie/Change_orientedAngle_f…

…unction

Change orientedAngle function g-truc#1079

glm/gtx/vector_angle.inl

@@ -20,14 +20,15 @@ namespace glm
  return acos(clamp(dot(x, y), T(-1), T(1)));
  }
 
- //! \todo epsilon is hard coded to 0.01
  template<typename T, qualifier Q>
  GLM_FUNC_QUALIFIER T orientedAngle(vec<2, T, Q> const& x, vec<2, T, Q> const& y)
  {
  GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'orientedAngle' only accept floating-point inputs");
  T const Angle(acos(clamp(dot(x, y), T(-1), T(1))));
 
- if(all(epsilonEqual(y, glm::rotate(x, Angle), T(0.0001))))
+ T const partialCross = x.x * y.y - y.x * x.y;
+
+ if (partialCross > T(0))
  return Angle;
  else
  return -Angle;