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#include "../exponential.hpp"
#include "../common.hpp"
namespace glm{
namespace detail
{
template<length_t L, typename T, qualifier Q, bool Aligned>
struct compute_length
{
GLM_FUNC_QUALIFIER static T call(vec<L, T, Q> const& v)
{
return sqrt(dot(v, v));
}
};
template<length_t L, typename T, qualifier Q, bool Aligned>
struct compute_distance
{
GLM_FUNC_QUALIFIER static T call(vec<L, T, Q> const& p0, vec<L, T, Q> const& p1)
{
return length(p1 - p0);
}
};
template<typename V, typename T, bool Aligned>
struct compute_dot{};
template<typename T, qualifier Q, bool Aligned>
struct compute_dot<vec<1, T, Q>, T, Aligned>
{
GLM_FUNC_QUALIFIER static T call(vec<1, T, Q> const& a, vec<1, T, Q> const& b)
{
return a.x * b.x;
}
};
template<typename T, qualifier Q, bool Aligned>
struct compute_dot<vec<2, T, Q>, T, Aligned>
{
GLM_FUNC_QUALIFIER static T call(vec<2, T, Q> const& a, vec<2, T, Q> const& b)
{
vec<2, T, Q> tmp(a * b);
return tmp.x + tmp.y;
}
};
template<typename T, qualifier Q, bool Aligned>
struct compute_dot<vec<3, T, Q>, T, Aligned>
{
GLM_FUNC_QUALIFIER static T call(vec<3, T, Q> const& a, vec<3, T, Q> const& b)
{
vec<3, T, Q> tmp(a * b);
return tmp.x + tmp.y + tmp.z;
}
};
template<typename T, qualifier Q, bool Aligned>
struct compute_dot<vec<4, T, Q>, T, Aligned>
{
GLM_FUNC_QUALIFIER static T call(vec<4, T, Q> const& a, vec<4, T, Q> const& b)
{
vec<4, T, Q> tmp(a * b);
return (tmp.x + tmp.y) + (tmp.z + tmp.w);
}
};
template<typename T, qualifier Q, bool Aligned>
struct compute_cross
{
GLM_FUNC_QUALIFIER static vec<3, T, Q> call(vec<3, T, Q> const& x, vec<3, T, Q> const& y)
{
GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'cross' accepts only floating-point inputs");
return vec<3, T, Q>(
x.y * y.z - y.y * x.z,
x.z * y.x - y.z * x.x,
x.x * y.y - y.x * x.y);
}
};
template<length_t L, typename T, qualifier Q, bool Aligned>
struct compute_normalize
{
GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& v)
{
GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'normalize' accepts only floating-point inputs");
return v * inversesqrt(dot(v, v));
}
};
template<length_t L, typename T, qualifier Q, bool Aligned>
struct compute_faceforward
{
GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& N, vec<L, T, Q> const& I, vec<L, T, Q> const& Nref)
{
GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'normalize' accepts only floating-point inputs");
return dot(Nref, I) < static_cast<T>(0) ? N : -N;
}
};
template<length_t L, typename T, qualifier Q, bool Aligned>
struct compute_reflect
{
GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& I, vec<L, T, Q> const& N)
{
return I - N * dot(N, I) * static_cast<T>(2);
}
};
template<length_t L, typename T, qualifier Q, bool Aligned>
struct compute_refract
{
GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& I, vec<L, T, Q> const& N, T eta)
{
T const dotValue(dot(N, I));
T const k(static_cast<T>(1) - eta * eta * (static_cast<T>(1) - dotValue * dotValue));
vec<L, T, Q> const Result =
(k >= static_cast<T>(0)) ? (eta * I - (eta * dotValue + std::sqrt(k)) * N) : vec<L, T, Q>(0);
return Result;
}
};
}//namespace detail
// length
template<typename genType>
GLM_FUNC_QUALIFIER genType length(genType x)
{
GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'length' accepts only floating-point inputs");
return abs(x);
}
template<length_t L, typename T, qualifier Q>
GLM_FUNC_QUALIFIER T length(vec<L, T, Q> const& v)
{
GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'length' accepts only floating-point inputs");
return detail::compute_length<L, T, Q, detail::is_aligned<Q>::value>::call(v);
}
// distance
template<typename genType>
GLM_FUNC_QUALIFIER genType distance(genType const& p0, genType const& p1)
{
GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'distance' accepts only floating-point inputs");
return length(p1 - p0);
}
template<length_t L, typename T, qualifier Q>
GLM_FUNC_QUALIFIER T distance(vec<L, T, Q> const& p0, vec<L, T, Q> const& p1)
{
return detail::compute_distance<L, T, Q, detail::is_aligned<Q>::value>::call(p0, p1);
}
// dot
template<typename T>
GLM_FUNC_QUALIFIER T dot(T x, T y)
{
GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'dot' accepts only floating-point inputs");
return x * y;
}
template<length_t L, typename T, qualifier Q>
GLM_FUNC_QUALIFIER T dot(vec<L, T, Q> const& x, vec<L, T, Q> const& y)
{
GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'dot' accepts only floating-point inputs");
return detail::compute_dot<vec<L, T, Q>, T, detail::is_aligned<Q>::value>::call(x, y);
}
// cross
template<typename T, qualifier Q>
GLM_FUNC_QUALIFIER vec<3, T, Q> cross(vec<3, T, Q> const& x, vec<3, T, Q> const& y)
{
return detail::compute_cross<T, Q, detail::is_aligned<Q>::value>::call(x, y);
}
/*
// normalize
template<typename genType>
GLM_FUNC_QUALIFIER genType normalize(genType const& x)
{
GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'normalize' accepts only floating-point inputs");
return x < genType(0) ? genType(-1) : genType(1);
}
*/
template<length_t L, typename T, qualifier Q>
GLM_FUNC_QUALIFIER vec<L, T, Q> normalize(vec<L, T, Q> const& x)
{
GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'normalize' accepts only floating-point inputs");
return detail::compute_normalize<L, T, Q, detail::is_aligned<Q>::value>::call(x);
}
// faceforward
template<typename genType>
GLM_FUNC_QUALIFIER genType faceforward(genType const& N, genType const& I, genType const& Nref)
{
return dot(Nref, I) < static_cast<genType>(0) ? N : -N;
}
template<length_t L, typename T, qualifier Q>
GLM_FUNC_QUALIFIER vec<L, T, Q> faceforward(vec<L, T, Q> const& N, vec<L, T, Q> const& I, vec<L, T, Q> const& Nref)
{
return detail::compute_faceforward<L, T, Q, detail::is_aligned<Q>::value>::call(N, I, Nref);
}
// reflect
template<typename genType>
GLM_FUNC_QUALIFIER genType reflect(genType const& I, genType const& N)
{
return I - N * dot(N, I) * genType(2);
}
template<length_t L, typename T, qualifier Q>
GLM_FUNC_QUALIFIER vec<L, T, Q> reflect(vec<L, T, Q> const& I, vec<L, T, Q> const& N)
{
return detail::compute_reflect<L, T, Q, detail::is_aligned<Q>::value>::call(I, N);
}
// refract
template<typename genType>
GLM_FUNC_QUALIFIER genType refract(genType const& I, genType const& N, genType eta)
{
GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'refract' accepts only floating-point inputs");
genType const dotValue(dot(N, I));
genType const k(static_cast<genType>(1) - eta * eta * (static_cast<genType>(1) - dotValue * dotValue));
return (eta * I - (eta * dotValue + sqrt(k)) * N) * static_cast<genType>(k >= static_cast<genType>(0));
}
template<length_t L, typename T, qualifier Q>
GLM_FUNC_QUALIFIER vec<L, T, Q> refract(vec<L, T, Q> const& I, vec<L, T, Q> const& N, T eta)
{
GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'refract' accepts only floating-point inputs");
return detail::compute_refract<L, T, Q, detail::is_aligned<Q>::value>::call(I, N, eta);
}
}//namespace glm
#if GLM_CONFIG_SIMD == GLM_ENABLE
# include "func_geometric_simd.inl"
#endif
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