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Added log2 meta programming implementation

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This commit is contained in:
Christophe Riccio 2011-10-13 18:59:25 +01:00
parent 620861973e
commit c004d95bdf
1 changed files with 25 additions and 3 deletions
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28
glm/core/func_exponential.inl
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@ -224,6 +224,30 @@ namespace glm
exp2(x.w));
}
namespace detail
{
template <int PATH = float_or_int_value::ERROR>
struct compute_log2
{
template <typename T>
T operator() (T const & Value) const
{
static_assert(0, "'log2' parameter has an invalid template parameter type");
return Value;
}
};
template <>
struct compute_log2<float_or_int_value::FLOAT>
{
template <typename T>
T operator() (T const & Value) const
{
return ::std::log(Value) / T(0.69314718055994530941723212145818);
}
};
}//namespace detail
// log2, ln2 = 0.69314718055994530941723212145818f
template <typename genType>
GLM_FUNC_QUALIFIER genType log2
@ -231,9 +255,7 @@ namespace glm
genType const & x
)
{
GLM_STATIC_ASSERT(detail::type<genType>::is_float, "'log2' only accept floating-point input");
return ::std::log(x) / genType(0.69314718055994530941723212145818);
return detail::compute_log2<detail::float_or_int_trait<genType>::ID>()(x);
}
template <typename T>