59 lines
1.5 KiB
C++
59 lines
1.5 KiB
C++
/// @ref gtx_vector_angle
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/// @file glm/gtx/vector_angle.inl
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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(-1), 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(-1), 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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tvec2<T, P> const & x,
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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(-1), T(1))));
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if(all(epsilonEqual(y, glm::rotate(x, Angle), T(0.0001))))
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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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tvec3<T, P> const & x,
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tvec3<T, P> const & y,
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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(-1), 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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