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/// @ref gtc_integer
namespace glm{
namespace detail
{
template<length_t L, typename T, qualifier Q, bool Aligned>
struct compute_log2<L, T, Q, false, Aligned>
{
GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& v)
{
//Equivalent to return findMSB(vec); but save one function call in ASM with VC
//return findMSB(vec);
return vec<L, T, Q>(detail::compute_findMSB_vec<L, T, Q, sizeof(T) * 8>::call(v));
}
};
# if GLM_HAS_BITSCAN_WINDOWS
template<qualifier Q, bool Aligned>
struct compute_log2<4, int, Q, false, Aligned>
{
GLM_FUNC_QUALIFIER static vec<4, int, Q> call(vec<4, int, Q> const& v)
{
vec<4, int, Q> Result;
_BitScanReverse(reinterpret_cast<unsigned long*>(&Result.x), v.x);
_BitScanReverse(reinterpret_cast<unsigned long*>(&Result.y), v.y);
_BitScanReverse(reinterpret_cast<unsigned long*>(&Result.z), v.z);
_BitScanReverse(reinterpret_cast<unsigned long*>(&Result.w), v.w);
return Result;
}
};
# endif//GLM_HAS_BITSCAN_WINDOWS
}//namespace detail
template<typename genType>
GLM_FUNC_QUALIFIER int iround(genType x)
{
GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'iround' only accept floating-point inputs");
assert(static_cast<genType>(0.0) <= x);
return static_cast<int>(x + static_cast<genType>(0.5));
}
template<length_t L, typename T, qualifier Q>
GLM_FUNC_QUALIFIER vec<L, int, Q> iround(vec<L, T, Q> const& x)
{
GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'iround' only accept floating-point inputs");
assert(all(lessThanEqual(vec<L, T, Q>(0), x)));
return vec<L, int, Q>(x + static_cast<T>(0.5));
}
template<typename genType>
GLM_FUNC_QUALIFIER uint uround(genType x)
{
GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'uround' only accept floating-point inputs");
assert(static_cast<genType>(0.0) <= x);
return static_cast<uint>(x + static_cast<genType>(0.5));
}
template<length_t L, typename T, qualifier Q>
GLM_FUNC_QUALIFIER vec<L, uint, Q> uround(vec<L, T, Q> const& x)
{
GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'uround' only accept floating-point inputs");
assert(all(lessThanEqual(vec<L, T, Q>(0), x)));
return vec<L, uint, Q>(x + static_cast<T>(0.5));
}
}//namespace glm
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