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using System;
using System.Runtime.CompilerServices;
namespace Ryujinx.Audio.Renderer.Dsp
{
public static class FloatingPointHelper
{
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static float MultiplyRoundDown(float a, float b)
{
return RoundDown(a * b);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static float RoundDown(float a)
{
return MathF.Round(a, 0);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static float RoundUp(float a)
{
return MathF.Round(a);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static float MultiplyRoundUp(float a, float b)
{
return RoundUp(a * b);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static float Pow10(float x)
{
// NOTE: Nintendo implementation uses Q15 and a LUT for this, we don't.
// As such, we support the same ranges as Nintendo to avoid unexpected behaviours.
if (x >= 0.0f)
{
return 1.0f;
}
if (x <= -5.3f)
{
return 0.0f;
}
return MathF.Pow(10, x);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static float Log10(float x)
{
// NOTE: Nintendo uses an approximation of log10, we don't.
// As such, we support the same ranges as Nintendo to avoid unexpected behaviours.
return MathF.Pow(10, MathF.Max(x, 1.0e-10f));
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static float MeanSquare(ReadOnlySpan<float> inputs)
{
float res = 0.0f;
foreach (float input in inputs)
{
res += (input * input);
}
res /= inputs.Length;
return res;
}
/// <summary>
/// Map decibel to linear.
/// </summary>
/// <param name="db">The decibel value to convert</param>
/// <returns>Converted linear value/returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static float DecibelToLinear(float db)
{
return MathF.Pow(10.0f, db / 20.0f);
}
/// <summary>
/// Map decibel to linear in [0, 2] range.
/// </summary>
/// <param name="db">The decibel value to convert</param>
/// <returns>Converted linear value in [0, 2] range</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static float DecibelToLinearExtended(float db)
{
float tmp = MathF.Log2(DecibelToLinear(db));
return MathF.Truncate(tmp) + MathF.Pow(2.0f, tmp - MathF.Truncate(tmp));
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static float DegreesToRadians(float degrees)
{
return degrees * MathF.PI / 180.0f;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static float Cos(float value)
{
return MathF.Cos(DegreesToRadians(value));
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static float Sin(float value)
{
return MathF.Sin(DegreesToRadians(value));
}
}
}
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