72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
/// @ref gtc_integer
|
|
/// @file glm/gtc/integer.inl
|
|
|
|
namespace glm{
|
|
namespace detail
|
|
{
|
|
template <typename T, precision P, template <typename, precision> class vecType, bool Aligned>
|
|
struct compute_log2<T, P, vecType, false, Aligned>
|
|
{
|
|
GLM_FUNC_QUALIFIER static vecType<T, P> call(vecType<T, P> const & vec)
|
|
{
|
|
//Equivalent to return findMSB(vec); but save one function call in ASM with VC
|
|
//return findMSB(vec);
|
|
return vecType<T, P>(detail::compute_findMSB_vec<T, P, vecType, sizeof(T) * 8>::call(vec));
|
|
}
|
|
};
|
|
|
|
# if GLM_HAS_BITSCAN_WINDOWS
|
|
template <precision P, bool Aligned>
|
|
struct compute_log2<int, P, tvec4, false, Aligned>
|
|
{
|
|
GLM_FUNC_QUALIFIER static tvec4<int, P> call(tvec4<int, P> const & vec)
|
|
{
|
|
tvec4<int, P> Result(glm::uninitialize);
|
|
|
|
_BitScanReverse(reinterpret_cast<unsigned long*>(&Result.x), vec.x);
|
|
_BitScanReverse(reinterpret_cast<unsigned long*>(&Result.y), vec.y);
|
|
_BitScanReverse(reinterpret_cast<unsigned long*>(&Result.z), vec.z);
|
|
_BitScanReverse(reinterpret_cast<unsigned long*>(&Result.w), vec.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 <typename T, precision P, template <typename, precision> class vecType>
|
|
GLM_FUNC_QUALIFIER vecType<int, P> iround(vecType<T, P> const& x)
|
|
{
|
|
GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'iround' only accept floating-point inputs");
|
|
assert(all(lessThanEqual(vecType<T, P>(0), x)));
|
|
|
|
return vecType<int, P>(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 <typename T, precision P, template <typename, precision> class vecType>
|
|
GLM_FUNC_QUALIFIER vecType<uint, P> uround(vecType<T, P> const& x)
|
|
{
|
|
GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'uround' only accept floating-point inputs");
|
|
assert(all(lessThanEqual(vecType<T, P>(0), x)));
|
|
|
|
return vecType<uint, P>(x + static_cast<T>(0.5));
|
|
}
|
|
}//namespace glm
|