mirror of
https://github.com/OpenRCT2/OpenRCT2
synced 2026-01-16 19:43:06 +01:00
38 lines
1.2 KiB
C++
38 lines
1.2 KiB
C++
|
|
/*****************************************************************************
|
|
* Copyright (c) 2014-2024 OpenRCT2 developers
|
|
*
|
|
* For a complete list of all authors, please refer to contributors.md
|
|
* Interested in contributing? Visit https://github.com/OpenRCT2/OpenRCT2
|
|
*
|
|
* OpenRCT2 is licensed under the GNU General Public License version 3.
|
|
*****************************************************************************/
|
|
|
|
#pragma once
|
|
|
|
#include <stdexcept>
|
|
|
|
namespace
|
|
{
|
|
[[maybe_unused]] constexpr bool IsPowerOf2(int v)
|
|
{
|
|
return v && ((v & (v - 1)) == 0);
|
|
}
|
|
|
|
// Rounds an integer down to the given power of 2. y must be a power of 2.
|
|
[[maybe_unused]] constexpr int Floor2(const int x, const int y)
|
|
{
|
|
if (!IsPowerOf2(y))
|
|
throw std::logic_error("Floor2 should only operate on power of 2");
|
|
return x & ~(y - 1);
|
|
}
|
|
|
|
// Rounds an integer up to the given power of 2. y must be a power of 2.
|
|
[[maybe_unused]] constexpr int Ceil2(const int x, const int y)
|
|
{
|
|
if (!IsPowerOf2(y))
|
|
throw std::logic_error("Ceil2 should only operate on power of 2");
|
|
return (x + y - 1) & ~(y - 1);
|
|
}
|
|
} // namespace
|