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/// @ref gtx_vector_angle
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<length_t L, typename T, qualifier Q>
GLM_FUNC_QUALIFIER T angle(vec<L, T, Q> const& x, vec<L, T, Q> 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, 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))))
return Angle;
else
return -Angle;
}
template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER T orientedAngle(vec<3, T, Q> const& x, vec<3, T, Q> const& y, vec<3, T, Q> 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
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