66 lines
2.0 KiB
C++
66 lines
2.0 KiB
C++
///////////////////////////////////////////////////////////////////////////////////////////////////
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// OpenGL Mathematics Copyright (c) 2005 - 2013 G-Truc Creation (www.g-truc.net)
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Created : 2005-12-30
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// Updated : 2008-09-29
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// Licence : This source is under MIT License
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// File : glm/gtx/vector_angle.inl
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///////////////////////////////////////////////////////////////////////////////////////////////////
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namespace glm
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{
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template <typename genType>
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GLM_FUNC_QUALIFIER genType angle
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(
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genType const & x,
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genType const & y
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)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'angle' only accept floating-point inputs");
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return acos(clamp(dot(x, y), genType(0), genType(1)));
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}
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template <typename T, precision P, template <typename, precision> class vecType>
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GLM_FUNC_QUALIFIER T angle
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(
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vecType<T, P> const & x,
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vecType<T, P> const & y
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)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'angle' only accept floating-point inputs");
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return acos(clamp(dot(x, y), T(0), T(1)));
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}
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//! \todo epsilon is hard coded to 0.01
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template <typename T, precision P>
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GLM_FUNC_QUALIFIER T orientedAngle
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(
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detail::tvec2<T, P> const & x,
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detail::tvec2<T, P> const & y
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)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'orientedAngle' only accept floating-point inputs");
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T const Angle(acos(clamp(dot(x, y), T(0), T(1))));
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detail::tvec2<T, P> const TransformedVector(glm::rotate(x, Angle));
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if(all(epsilonEqual(y, TransformedVector, T(0.01))))
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return Angle;
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else
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return -Angle;
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}
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template <typename T, precision P>
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GLM_FUNC_QUALIFIER T orientedAngle
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(
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detail::tvec3<T, P> const & x,
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detail::tvec3<T, P> const & y,
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detail::tvec3<T, P> const & ref
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)
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{
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GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'orientedAngle' only accept floating-point inputs");
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T const Angle(acos(clamp(dot(x, y), T(0), T(1))));
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return mix(Angle, -Angle, dot(ref, cross(x, y)) < T(0));
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}
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}//namespace glm
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