1 files changed, 115 insertions, 0 deletions
diff --git a/src/Ryujinx.Audio/Renderer/Dsp/FloatingPointHelper.cs b/src/Ryujinx.Audio/Renderer/Dsp/FloatingPointHelper.cs
new file mode 100644
index 00000000..6645e20a
--- /dev/null
+++ b/src/Ryujinx.Audio/Renderer/Dsp/FloatingPointHelper.cs
@@ -0,0 +1,115 @@
+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));
+        }
+    }
+}
+\ No newline at end of file