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///////////////////////////////////////////////////////////////////////////////////
/// OpenGL Mathematics (glm.g-truc.net)
///
/// Copyright (c) 2005 - 2015 G-Truc Creation (www.g-truc.net)
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
///
/// Restrictions:
/// By making use of the Software for military purposes, you choose to make
/// a Bunny unhappy.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE.
///
/// @ref gtx_vector_angle
/// @file glm/gtx/vector_angle.inl
/// @date 2005-12-30 / 2011-06-07
/// @author Christophe Riccio
///////////////////////////////////////////////////////////////////////////////////
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
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