/// @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