90 lines
2.6 KiB
C++
90 lines
2.6 KiB
C++
/*
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* <Short Description>
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* Copyright (C) 2024 Brett Terpstra
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef BLT_FIXED_POINT_H
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#define BLT_FIXED_POINT_H
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#include <blt/std/types.h>
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#include <blt/std/utility.h>
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namespace blt
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{
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struct fp64
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{
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private:
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u64 v = 0;
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fp64() = default;
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explicit fp64(u64 v): v(v)
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{}
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public:
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static fp64 from_u64(u64 ui)
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{
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fp64 fp;
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fp.v = ui << 32;
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return fp;
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}
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static fp64 from_i64(i64 si)
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{
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u64 ui = static_cast<u64>(si);
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fp64 fp;
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fp.v = ui << 32;
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return fp;
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}
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BLT_ATTRIB_NO_INLINE friend fp64 operator+(fp64 left, fp64 right)
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{
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return fp64(left.v + right.v);
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}
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BLT_ATTRIB_NO_INLINE friend fp64 operator-(fp64 left, fp64 right)
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{
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return fp64(left.v - right.v);
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}
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BLT_ATTRIB_NO_INLINE friend fp64 operator*(fp64 left, fp64 right)
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{
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auto lhs = static_cast<__int128>(left.v);
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auto rhs = static_cast<__int128>(right.v);
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return fp64(static_cast<u64>((lhs * rhs) >> 32));
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}
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BLT_ATTRIB_NO_INLINE friend fp64 operator/(fp64 left, fp64 right)
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{
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auto lhs = static_cast<__int128>(left.v);
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auto rhs = static_cast<__int128>(right.v);
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return fp64(static_cast<u64>((lhs / rhs) << 32));
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}
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[[nodiscard]] u64 as_u64() const
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{
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return v >> 32;
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}
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[[nodiscard]] i64 as_i64() const
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{
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return static_cast<i64>(v >> 32);
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}
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};
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}
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#endif //BLT_FIXED_POINT_H
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