ryujinx/Ryujinx.Audio.Renderer/Dsp/FixedPointHelper.cs

//
// Copyright (c) 2019-2021 Ryujinx
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//

using System.Runtime.CompilerServices;

namespace Ryujinx.Audio.Renderer.Dsp
{
    public static class FixedPointHelper
    {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public static int ToInt(long value, int qBits)
        {
            return (int)(value >> qBits);
        }

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public static float ToFloat(long value, int qBits)
        {
            return (float)value / (1 << qBits);
        }

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public static int ToFixed(float value, int qBits)
        {
            return (int)(value * (1 << qBits));
        }

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public static int RoundUpAndToInt(long value, int qBits)
        {
            int half = 1 << (qBits - 1);

            return ToInt(value + half, qBits);
        }
    }
}