mirror of
https://github.com/Atmosphere-NX/Atmosphere-libs.git
synced 2025-10-31 03:25:47 +01:00
97 lines
4.2 KiB
C++
97 lines
4.2 KiB
C++
/*
|
|
* Copyright (c) Atmosphère-NX
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#pragma once
|
|
#include <vapours/common.hpp>
|
|
#include <vapours/assert.hpp>
|
|
|
|
namespace ams::util {
|
|
|
|
namespace impl {
|
|
|
|
template<typename IntegralStorageType>
|
|
struct BitPack {
|
|
IntegralStorageType value;
|
|
private:
|
|
static_assert(std::is_integral<IntegralStorageType>::value);
|
|
static_assert(std::is_unsigned<IntegralStorageType>::value);
|
|
|
|
template<size_t Index, size_t Count>
|
|
static constexpr inline IntegralStorageType Mask = [] {
|
|
static_assert(Index < BITSIZEOF(IntegralStorageType));
|
|
static_assert(0 < Count && Count <= BITSIZEOF(IntegralStorageType));
|
|
static_assert(Index + Count <= BITSIZEOF(IntegralStorageType));
|
|
|
|
if constexpr (Count == BITSIZEOF(IntegralStorageType)) {
|
|
return ~IntegralStorageType(0);
|
|
} else {
|
|
return ((IntegralStorageType(1) << Count) - 1) << Index;
|
|
}
|
|
}();
|
|
public:
|
|
template<size_t _Index, size_t _Count, typename T = IntegralStorageType>
|
|
struct Field {
|
|
using Type = T;
|
|
static constexpr size_t Index = _Index;
|
|
static constexpr size_t Count = _Count;
|
|
static constexpr size_t Next = Index + Count;
|
|
|
|
using BitPackType = BitPack<IntegralStorageType>;
|
|
static_assert(util::is_pod<BitPackType>::value);
|
|
|
|
static_assert(Mask<Index, Count> != 0);
|
|
static_assert(std::is_integral<T>::value || std::is_enum<T>::value);
|
|
static_assert(!std::is_same<T, bool>::value || Count == 1);
|
|
};
|
|
public:
|
|
constexpr ALWAYS_INLINE void Clear() {
|
|
constexpr IntegralStorageType Zero = IntegralStorageType(0);
|
|
this->value = Zero;
|
|
}
|
|
|
|
template<typename FieldType>
|
|
constexpr ALWAYS_INLINE typename FieldType::Type Get() const {
|
|
static_assert(std::is_same<FieldType, Field<FieldType::Index, FieldType::Count, typename FieldType::Type>>::value);
|
|
return static_cast<typename FieldType::Type>((this->value & Mask<FieldType::Index, FieldType::Count>) >> FieldType::Index);
|
|
}
|
|
|
|
template<typename FieldType>
|
|
constexpr ALWAYS_INLINE void Set(typename FieldType::Type field_value) {
|
|
static_assert(std::is_same<FieldType, Field<FieldType::Index, FieldType::Count, typename FieldType::Type>>::value);
|
|
constexpr IntegralStorageType FieldMask = Mask<FieldType::Index, FieldType::Count>;
|
|
this->value &= ~FieldMask;
|
|
this->value |= (static_cast<IntegralStorageType>(field_value) << FieldType::Index) & FieldMask;
|
|
}
|
|
};
|
|
|
|
}
|
|
|
|
using BitPack8 = impl::BitPack<u8>;
|
|
using BitPack16 = impl::BitPack<u16>;
|
|
using BitPack32 = impl::BitPack<u32>;
|
|
using BitPack64 = impl::BitPack<u64>;
|
|
|
|
static_assert(util::is_pod<BitPack8>::value);
|
|
static_assert(util::is_pod<BitPack16>::value);
|
|
static_assert(util::is_pod<BitPack32>::value);
|
|
static_assert(util::is_pod<BitPack64>::value);
|
|
static_assert(std::is_trivially_destructible<BitPack8 >::value);
|
|
static_assert(std::is_trivially_destructible<BitPack16>::value);
|
|
static_assert(std::is_trivially_destructible<BitPack32>::value);
|
|
static_assert(std::is_trivially_destructible<BitPack64>::value);
|
|
|
|
}
|