/// @ref gtx_vector_angle /// @file glm/gtx/vector_angle.inl namespace glm { template <typename genType> GLM_FUNC_QUALIFIER genType angle ( genType const & x, genType const & y ) { GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'angle' only accept floating-point inputs"); return acos(clamp(dot(x, y), genType(-1), genType(1))); } template <typename T, precision P, template <typename, precision> class vecType> GLM_FUNC_QUALIFIER T angle ( vecType<T, P> const & x, vecType<T, P> const & y ) { GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'angle' only accept floating-point inputs"); return acos(clamp(dot(x, y), T(-1), T(1))); } //! \todo epsilon is hard coded to 0.01 template <typename T, precision P> GLM_FUNC_QUALIFIER T orientedAngle ( tvec2<T, P> const & x, tvec2<T, P> 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)))) return Angle; else return -Angle; } template <typename T, precision P> GLM_FUNC_QUALIFIER T orientedAngle ( tvec3<T, P> const & x, tvec3<T, P> const & y, tvec3<T, P> const & ref ) { 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)))); return mix(Angle, -Angle, dot(ref, cross(x, y)) < T(0)); } }//namespace glm