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maths: add rsqrt convenience function

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Danny Robson 2018-04-17 17:01:29 +10:00
parent 76c809f031
commit 1678cb3a69
1 changed files with 9 additions and 0 deletions
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maths.hpp
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@ -214,6 +214,15 @@ namespace util {
/////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////
// exponentials // exponentials
// reciprocal sqrt, provided so that we can search for usages and replace
// at a later point with a more efficient implementation.
inline float
rsqrt (float val)
{
return 1 / std::sqrt (val);
}
template < template <
typename BaseT, typename BaseT,
typename ExponentT, typename ExponentT,