1/// @ref gtx_vector_angle 2/// @file glm/gtx/vector_angle.inl 3 4namespace glm 5{ 6 template <typename genType> 7 GLM_FUNC_QUALIFIER genType angle 8 ( 9 genType const & x, 10 genType const & y 11 ) 12 { 13 GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'angle' only accept floating-point inputs"); 14 return acos(clamp(dot(x, y), genType(-1), genType(1))); 15 } 16 17 template <typename T, precision P, template <typename, precision> class vecType> 18 GLM_FUNC_QUALIFIER T angle 19 ( 20 vecType<T, P> const & x, 21 vecType<T, P> const & y 22 ) 23 { 24 GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'angle' only accept floating-point inputs"); 25 return acos(clamp(dot(x, y), T(-1), T(1))); 26 } 27 28 //! \todo epsilon is hard coded to 0.01 29 template <typename T, precision P> 30 GLM_FUNC_QUALIFIER T orientedAngle 31 ( 32 tvec2<T, P> const & x, 33 tvec2<T, P> const & y 34 ) 35 { 36 GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'orientedAngle' only accept floating-point inputs"); 37 T const Angle(acos(clamp(dot(x, y), T(-1), T(1)))); 38 39 if(all(epsilonEqual(y, glm::rotate(x, Angle), T(0.0001)))) 40 return Angle; 41 else 42 return -Angle; 43 } 44 45 template <typename T, precision P> 46 GLM_FUNC_QUALIFIER T orientedAngle 47 ( 48 tvec3<T, P> const & x, 49 tvec3<T, P> const & y, 50 tvec3<T, P> const & ref 51 ) 52 { 53 GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'orientedAngle' only accept floating-point inputs"); 54 55 T const Angle(acos(clamp(dot(x, y), T(-1), T(1)))); 56 return mix(Angle, -Angle, dot(ref, cross(x, y)) < T(0)); 57 } 58}//namespace glm 59