1/// @ref gtx_vector_angle 2 3namespace glm 4{ 5 template<typename genType> 6 GLM_FUNC_QUALIFIER genType angle 7 ( 8 genType const& x, 9 genType const& y 10 ) 11 { 12 GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'angle' only accept floating-point inputs"); 13 return acos(clamp(dot(x, y), genType(-1), genType(1))); 14 } 15 16 template<length_t L, typename T, qualifier Q> 17 GLM_FUNC_QUALIFIER T angle(vec<L, T, Q> const& x, vec<L, T, Q> const& y) 18 { 19 GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'angle' only accept floating-point inputs"); 20 return acos(clamp(dot(x, y), T(-1), T(1))); 21 } 22 23 //! \todo epsilon is hard coded to 0.01 24 template<typename T, qualifier Q> 25 GLM_FUNC_QUALIFIER T orientedAngle(vec<2, T, Q> const& x, vec<2, T, Q> const& y) 26 { 27 GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'orientedAngle' only accept floating-point inputs"); 28 T const Angle(acos(clamp(dot(x, y), T(-1), T(1)))); 29 30 if(all(epsilonEqual(y, glm::rotate(x, Angle), T(0.0001)))) 31 return Angle; 32 else 33 return -Angle; 34 } 35 36 template<typename T, qualifier Q> 37 GLM_FUNC_QUALIFIER T orientedAngle(vec<3, T, Q> const& x, vec<3, T, Q> const& y, vec<3, T, Q> const& ref) 38 { 39 GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'orientedAngle' only accept floating-point inputs"); 40 41 T const Angle(acos(clamp(dot(x, y), T(-1), T(1)))); 42 return mix(Angle, -Angle, dot(ref, cross(x, y)) < T(0)); 43 } 44}//namespace glm 45