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Diffstat (limited to 'external/include/glm/detail/func_exponential.inl')
| -rw-r--r-- | external/include/glm/detail/func_exponential.inl | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/external/include/glm/detail/func_exponential.inl b/external/include/glm/detail/func_exponential.inl new file mode 100644 index 0000000..227fe91 --- /dev/null +++ b/external/include/glm/detail/func_exponential.inl @@ -0,0 +1,146 @@ +/// @ref core +/// @file glm/detail/func_exponential.inl + +#include "func_vector_relational.hpp" +#include "_vectorize.hpp" +#include <limits> +#include <cmath> +#include <cassert> + +namespace glm{ +namespace detail +{ +# if GLM_HAS_CXX11_STL + using std::log2; +# else + template <typename genType> + genType log2(genType Value) + { + return std::log(Value) * static_cast<genType>(1.4426950408889634073599246810019); + } +# endif + + template <typename T, precision P, template <class, precision> class vecType, bool isFloat, bool Aligned> + struct compute_log2 + { + GLM_FUNC_QUALIFIER static vecType<T, P> call(vecType<T, P> const & vec) + { + return detail::functor1<T, T, P, vecType>::call(log2, vec); + } + }; + + template <template <class, precision> class vecType, typename T, precision P, bool Aligned> + struct compute_sqrt + { + GLM_FUNC_QUALIFIER static vecType<T, P> call(vecType<T, P> const & x) + { + return detail::functor1<T, T, P, vecType>::call(std::sqrt, x); + } + }; + + template <template <class, precision> class vecType, typename T, precision P, bool Aligned> + struct compute_inversesqrt + { + GLM_FUNC_QUALIFIER static vecType<T, P> call(vecType<T, P> const & x) + { + return static_cast<T>(1) / sqrt(x); + } + }; + + template <template <class, precision> class vecType, bool Aligned> + struct compute_inversesqrt<vecType, float, lowp, Aligned> + { + GLM_FUNC_QUALIFIER static vecType<float, lowp> call(vecType<float, lowp> const & x) + { + vecType<float, lowp> tmp(x); + vecType<float, lowp> xhalf(tmp * 0.5f); + vecType<uint, lowp>* p = reinterpret_cast<vecType<uint, lowp>*>(const_cast<vecType<float, lowp>*>(&x)); + vecType<uint, lowp> i = vecType<uint, lowp>(0x5f375a86) - (*p >> vecType<uint, lowp>(1)); + vecType<float, lowp>* ptmp = reinterpret_cast<vecType<float, lowp>*>(&i); + tmp = *ptmp; + tmp = tmp * (1.5f - xhalf * tmp * tmp); + return tmp; + } + }; +}//namespace detail + + // pow + using std::pow; + template <typename T, precision P, template <typename, precision> class vecType> + GLM_FUNC_QUALIFIER vecType<T, P> pow(vecType<T, P> const & base, vecType<T, P> const & exponent) + { + return detail::functor2<T, P, vecType>::call(pow, base, exponent); + } + + // exp + using std::exp; + template <typename T, precision P, template <typename, precision> class vecType> + GLM_FUNC_QUALIFIER vecType<T, P> exp(vecType<T, P> const & x) + { + return detail::functor1<T, T, P, vecType>::call(exp, x); + } + + // log + using std::log; + template <typename T, precision P, template <typename, precision> class vecType> + GLM_FUNC_QUALIFIER vecType<T, P> log(vecType<T, P> const & x) + { + return detail::functor1<T, T, P, vecType>::call(log, x); + } + + //exp2, ln2 = 0.69314718055994530941723212145818f + template <typename genType> + GLM_FUNC_QUALIFIER genType exp2(genType x) + { + GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'exp2' only accept floating-point inputs"); + + return std::exp(static_cast<genType>(0.69314718055994530941723212145818) * x); + } + + template <typename T, precision P, template <typename, precision> class vecType> + GLM_FUNC_QUALIFIER vecType<T, P> exp2(vecType<T, P> const & x) + { + return detail::functor1<T, T, P, vecType>::call(exp2, x); + } + + // log2, ln2 = 0.69314718055994530941723212145818f + template <typename genType> + GLM_FUNC_QUALIFIER genType log2(genType x) + { + return log2(tvec1<genType>(x)).x; + } + + template <typename T, precision P, template <typename, precision> class vecType> + GLM_FUNC_QUALIFIER vecType<T, P> log2(vecType<T, P> const & x) + { + return detail::compute_log2<T, P, vecType, std::numeric_limits<T>::is_iec559, detail::is_aligned<P>::value>::call(x); + } + + // sqrt + using std::sqrt; + template <typename T, precision P, template <typename, precision> class vecType> + GLM_FUNC_QUALIFIER vecType<T, P> sqrt(vecType<T, P> const & x) + { + GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'sqrt' only accept floating-point inputs"); + return detail::compute_sqrt<vecType, T, P, detail::is_aligned<P>::value>::call(x); + } + + // inversesqrt + template <typename genType> + GLM_FUNC_QUALIFIER genType inversesqrt(genType x) + { + return static_cast<genType>(1) / sqrt(x); + } + + template <typename T, precision P, template <typename, precision> class vecType> + GLM_FUNC_QUALIFIER vecType<T, P> inversesqrt(vecType<T, P> const & x) + { + GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'inversesqrt' only accept floating-point inputs"); + return detail::compute_inversesqrt<vecType, T, P, detail::is_aligned<P>::value>::call(x); + } +}//namespace glm + +#if GLM_ARCH != GLM_ARCH_PURE && GLM_HAS_UNRESTRICTED_UNIONS +# include "func_exponential_simd.inl" +#endif + |