using System; using System.Reflection.Metadata; 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; } else 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)); } } }