mirror of
https://github.com/libretro/RetroArch
synced 2025-02-09 00:40:09 +00:00
139 lines
3.1 KiB
C++
139 lines
3.1 KiB
C++
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
// OpenGL Mathematics Copyright (c) 2005 - 2014 G-Truc Creation (www.g-truc.net)
|
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
// Created : 2006-01-04
|
|
// Updated : 2011-10-14
|
|
// Licence : This source is under MIT License
|
|
// File : glm/gtx/fast_square_root.inl
|
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
namespace glm
|
|
{
|
|
// fastSqrt
|
|
template <typename genType>
|
|
inline genType fastSqrt
|
|
(
|
|
genType const & x
|
|
)
|
|
{
|
|
return genType(1) / fastInverseSqrt(x);
|
|
}
|
|
|
|
VECTORIZE_VEC(fastSqrt)
|
|
|
|
// fastInversesqrt
|
|
template <>
|
|
inline float fastInverseSqrt<float>(float const & x)
|
|
{
|
|
return detail::compute_inversesqrt<detail::tvec1, float, lowp>::call(detail::tvec1<float, lowp>(x)).x;
|
|
}
|
|
|
|
template <>
|
|
inline double fastInverseSqrt<double>(double const & x)
|
|
{
|
|
return detail::compute_inversesqrt<detail::tvec1, double, lowp>::call(detail::tvec1<double, lowp>(x)).x;
|
|
}
|
|
|
|
template <template <class, precision> class vecType, typename T, precision P>
|
|
inline vecType<T, P> fastInverseSqrt
|
|
(
|
|
vecType<T, P> const & x
|
|
)
|
|
{
|
|
return detail::compute_inversesqrt<vecType, T, P>::call(x);
|
|
}
|
|
|
|
VECTORIZE_VEC(fastInverseSqrt)
|
|
|
|
// fastLength
|
|
template <typename genType>
|
|
inline genType fastLength
|
|
(
|
|
genType const & x
|
|
)
|
|
{
|
|
return abs(x);
|
|
}
|
|
|
|
template <typename valType, precision P>
|
|
inline valType fastLength
|
|
(
|
|
detail::tvec2<valType, P> const & x
|
|
)
|
|
{
|
|
valType sqr = x.x * x.x + x.y * x.y;
|
|
return fastSqrt(sqr);
|
|
}
|
|
|
|
template <typename valType, precision P>
|
|
inline valType fastLength
|
|
(
|
|
detail::tvec3<valType, P> const & x
|
|
)
|
|
{
|
|
valType sqr = x.x * x.x + x.y * x.y + x.z * x.z;
|
|
return fastSqrt(sqr);
|
|
}
|
|
|
|
template <typename valType, precision P>
|
|
inline valType fastLength
|
|
(
|
|
detail::tvec4<valType, P> const & x
|
|
)
|
|
{
|
|
valType sqr = x.x * x.x + x.y * x.y + x.z * x.z + x.w * x.w;
|
|
return fastSqrt(sqr);
|
|
}
|
|
|
|
// fastDistance
|
|
template <typename genType>
|
|
inline genType fastDistance
|
|
(
|
|
genType const & x,
|
|
genType const & y
|
|
)
|
|
{
|
|
return fastLength(y - x);
|
|
}
|
|
|
|
// fastNormalize
|
|
template <typename genType>
|
|
inline genType fastNormalize
|
|
(
|
|
genType const & x
|
|
)
|
|
{
|
|
return x > genType(0) ? genType(1) : -genType(1);
|
|
}
|
|
|
|
template <typename valType, precision P>
|
|
inline detail::tvec2<valType, P> fastNormalize
|
|
(
|
|
detail::tvec2<valType, P> const & x
|
|
)
|
|
{
|
|
valType sqr = x.x * x.x + x.y * x.y;
|
|
return x * fastInverseSqrt(sqr);
|
|
}
|
|
|
|
template <typename valType, precision P>
|
|
inline detail::tvec3<valType, P> fastNormalize
|
|
(
|
|
detail::tvec3<valType, P> const & x
|
|
)
|
|
{
|
|
valType sqr = x.x * x.x + x.y * x.y + x.z * x.z;
|
|
return x * fastInverseSqrt(sqr);
|
|
}
|
|
|
|
template <typename valType, precision P>
|
|
inline detail::tvec4<valType, P> fastNormalize
|
|
(
|
|
detail::tvec4<valType, P> const & x
|
|
)
|
|
{
|
|
valType sqr = x.x * x.x + x.y * x.y + x.z * x.z + x.w * x.w;
|
|
return x * fastInverseSqrt(sqr);
|
|
}
|
|
}//namespace glm
|