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author | LaG1924 <12997935+LaG1924@users.noreply.github.com> | 2017-05-12 15:49:50 +0200 |
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committer | LaG1924 <12997935+LaG1924@users.noreply.github.com> | 2017-05-12 15:49:50 +0200 |
commit | e62817b8252974b8a98393275874ee303840bf13 (patch) | |
tree | 4565935f06e369f4a84410b0c098958e07a750c7 /depedencies/include/glm/gtx/fast_square_root.inl | |
parent | 2017-05-10 (diff) | |
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-rw-r--r-- | depedencies/include/glm/gtx/fast_square_root.inl | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/depedencies/include/glm/gtx/fast_square_root.inl b/depedencies/include/glm/gtx/fast_square_root.inl new file mode 100644 index 0000000..73950ae --- /dev/null +++ b/depedencies/include/glm/gtx/fast_square_root.inl @@ -0,0 +1,81 @@ +/// @ref gtx_fast_square_root +/// @file glm/gtx/fast_square_root.inl + +namespace glm +{ + // fastSqrt + template <typename genType> + GLM_FUNC_QUALIFIER genType fastSqrt(genType x) + { + GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'fastSqrt' only accept floating-point input"); + + return genType(1) / fastInverseSqrt(x); + } + + template <typename T, precision P, template <typename, precision> class vecType> + GLM_FUNC_QUALIFIER vecType<T, P> fastSqrt(vecType<T, P> const & x) + { + return detail::functor1<T, T, P, vecType>::call(fastSqrt, x); + } + + // fastInversesqrt + template <typename genType> + GLM_FUNC_QUALIFIER genType fastInverseSqrt(genType x) + { +# ifdef __CUDACC__ // Wordaround for a CUDA compiler bug up to CUDA6 + tvec1<T, P> tmp(detail::compute_inversesqrt<tvec1, genType, lowp, detail::is_aligned<lowp>::value>::call(tvec1<genType, lowp>(x))); + return tmp.x; +# else + return detail::compute_inversesqrt<tvec1, genType, highp, detail::is_aligned<highp>::value>::call(tvec1<genType, lowp>(x)).x; +# endif + } + + template <typename T, precision P, template <typename, precision> class vecType> + GLM_FUNC_QUALIFIER vecType<T, P> fastInverseSqrt(vecType<T, P> const & x) + { + return detail::compute_inversesqrt<vecType, T, P, detail::is_aligned<P>::value>::call(x); + } + + // fastLength + template <typename genType> + GLM_FUNC_QUALIFIER genType fastLength(genType x) + { + GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'fastLength' only accept floating-point inputs"); + + return abs(x); + } + + template <typename T, precision P, template <typename, precision> class vecType> + GLM_FUNC_QUALIFIER T fastLength(vecType<T, P> const & x) + { + GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'fastLength' only accept floating-point inputs"); + + return fastSqrt(dot(x, x)); + } + + // fastDistance + template <typename genType> + GLM_FUNC_QUALIFIER genType fastDistance(genType x, genType y) + { + return fastLength(y - x); + } + + template <typename T, precision P, template <typename, precision> class vecType> + GLM_FUNC_QUALIFIER T fastDistance(vecType<T, P> const & x, vecType<T, P> const & y) + { + return fastLength(y - x); + } + + // fastNormalize + template <typename genType> + GLM_FUNC_QUALIFIER genType fastNormalize(genType x) + { + return x > genType(0) ? genType(1) : -genType(1); + } + + template <typename T, precision P, template <typename, precision> class vecType> + GLM_FUNC_QUALIFIER vecType<T, P> fastNormalize(vecType<T, P> const & x) + { + return x * fastInverseSqrt(dot(x, x)); + } +}//namespace glm |