45 lines
1.4 KiB
Text
45 lines
1.4 KiB
Text
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/// @ref gtx_vector_angle
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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<length_t L, typename T, qualifier Q>
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GLM_FUNC_QUALIFIER T angle(vec<L, T, Q> const& x, vec<L, T, Q> const& y)
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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, qualifier Q>
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GLM_FUNC_QUALIFIER T orientedAngle(vec<2, T, Q> const& x, vec<2, T, Q> const& y)
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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, qualifier Q>
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GLM_FUNC_QUALIFIER T orientedAngle(vec<3, T, Q> const& x, vec<3, T, Q> const& y, vec<3, T, Q> const& ref)
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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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