func_geometric.inl

#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