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Added saturateCast. (#354)

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This commit is contained in:
Branimir Karadžić
2025-12-13 11:05:24 -08:00
committed by GitHub
parent 5dc415ee2e
commit 4ac903bdcf
3 changed files with 164 additions and 3 deletions
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10
include/bx/bx.h
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@@ -224,6 +224,16 @@ namespace bx
template <typename Ty, typename FromT>
constexpr Ty bitCast(const FromT& _from);
/// Performs `static_cast` of value `_from`, and if value doesn't fit result type `Ty` it clamps
/// the value to `Ty` min/max.
template<typename Ty, typename FromT>
constexpr Ty saturateCast(const FromT& _from);
/// Performs `static_cast` of value `_from`, and returns true if the value `_from` is
/// representable as `Ty`.
template<typename Ty, typename FromT>
constexpr bool narrowCastTest(Ty* _out, const FromT& _from);
/// Performs `static_cast` of value `_from`, and in debug build runtime verifies/asserts
/// that the value didn't change.
template<typename Ty, typename FromT>

59
include/bx/inline/bx.inl
View File

@@ -171,18 +171,71 @@ namespace bx
return __builtin_bit_cast(Ty, _from);
}
template<typename Ty, typename FromT>
inline constexpr Ty saturateCast(const FromT& _from)
{
if constexpr (isSame<Ty, FromT>() )
{
return _from;
}
constexpr Ty mx = max<Ty>();
if constexpr (isSigned<Ty>() && isSigned<FromT>() )
{
if constexpr (sizeof(Ty) < sizeof(FromT) )
{
constexpr FromT mn = min<Ty>();
if (_from < mn)
{
return mn;
}
else if (_from > mx)
{
return mx;
}
}
}
else if constexpr (isSigned<FromT>() )
{
if (_from < FromT(0) )
{
return Ty(0);
}
else if (asUnsigned<FromT>(_from) > mx)
{
return mx;
}
}
else if (_from > asUnsigned<Ty>(max<Ty>() ) )
{
return mx;
}
return static_cast<Ty>(_from);
}
template<typename Ty, typename FromT>
inline constexpr bool narrowCastTest(Ty* _out, const FromT& _from)
{
*_out = static_cast<Ty>(_from);
if constexpr (isSame<Ty, FromT>() )
{
*_out = _from;
return true;
}
*_out = saturateCast<Ty>(_from);
return static_cast<FromT>(*_out) == _from;
}
template<typename Ty, typename FromT>
inline Ty narrowCast(const FromT& _from, Location _location)
{
Ty to = static_cast<Ty>(_from);
BX_ASSERT_LOC(_location, static_cast<FromT>(to) == _from
Ty to;
const bool result = narrowCastTest(&to, _from);
BX_ASSERT_LOC(_location, result
, "bx::narrowCast failed! Value is truncated!"
);
return to;