Move solution and projects to src

8 files changed, 571 insertions, 0 deletions

diff --git a/src/Ryujinx.Audio/Renderer/Dsp/State/AdpcmLoopContext.cs b/src/Ryujinx.Audio/Renderer/Dsp/State/AdpcmLoopContext.cs
new file mode 100644
index 00000000..821a135e
--- /dev/null
+++ b/src/Ryujinx.Audio/Renderer/Dsp/State/AdpcmLoopContext.cs
@@ -0,0 +1,12 @@
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Audio.Renderer.Dsp.State
+{
+    [StructLayout(LayoutKind.Sequential, Pack = 1, Size = 6)]
+    public struct AdpcmLoopContext
+    {
+        public short PredScale;
+        public short History0;
+        public short History1;
+    }
+}
\ No newline at end of file
diff --git a/src/Ryujinx.Audio/Renderer/Dsp/State/AuxiliaryBufferHeader.cs b/src/Ryujinx.Audio/Renderer/Dsp/State/AuxiliaryBufferHeader.cs
new file mode 100644
index 00000000..4e8d11e4
--- /dev/null
+++ b/src/Ryujinx.Audio/Renderer/Dsp/State/AuxiliaryBufferHeader.cs
@@ -0,0 +1,74 @@
+using Ryujinx.Memory;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Audio.Renderer.Dsp.State
+{
+    [StructLayout(LayoutKind.Sequential, Pack = 1, Size = 0x80)]
+    public struct AuxiliaryBufferHeader
+    {
+        [StructLayout(LayoutKind.Sequential, Pack = 1, Size = 0x40)]
+        public struct AuxiliaryBufferInfo
+        {
+            private const uint ReadOffsetPosition = 0x0;
+            private const uint WriteOffsetPosition = 0x4;
+            private const uint LostSampleCountPosition = 0x8;
+            private const uint TotalSampleCountPosition = 0xC;
+
+            public uint ReadOffset;
+            public uint WriteOffset;
+            public uint LostSampleCount;
+            public uint TotalSampleCount;
+            private unsafe fixed uint _unknown[12];
+
+            public static uint GetReadOffset(IVirtualMemoryManager manager, ulong bufferAddress)
+            {
+                return manager.Read<uint>(bufferAddress + ReadOffsetPosition);
+            }
+
+            public static uint GetWriteOffset(IVirtualMemoryManager manager, ulong bufferAddress)
+            {
+                return manager.Read<uint>(bufferAddress + WriteOffsetPosition);
+            }
+
+            public static uint GetLostSampleCount(IVirtualMemoryManager manager, ulong bufferAddress)
+            {
+                return manager.Read<uint>(bufferAddress + LostSampleCountPosition);
+            }
+
+            public static uint GetTotalSampleCount(IVirtualMemoryManager manager, ulong bufferAddress)
+            {
+                return manager.Read<uint>(bufferAddress + TotalSampleCountPosition);
+            }
+
+            public static void SetReadOffset(IVirtualMemoryManager manager, ulong bufferAddress, uint value)
+            {
+                manager.Write(bufferAddress + ReadOffsetPosition, value);
+            }
+
+            public static void SetWriteOffset(IVirtualMemoryManager manager, ulong bufferAddress, uint value)
+            {
+                manager.Write(bufferAddress + WriteOffsetPosition, value);
+            }
+
+            public static void SetLostSampleCount(IVirtualMemoryManager manager, ulong bufferAddress, uint value)
+            {
+                manager.Write(bufferAddress + LostSampleCountPosition, value);
+            }
+
+            public static void SetTotalSampleCount(IVirtualMemoryManager manager, ulong bufferAddress, uint value)
+            {
+                manager.Write(bufferAddress + TotalSampleCountPosition, value);
+            }
+
+            public static void Reset(IVirtualMemoryManager manager, ulong bufferAddress)
+            {
+                // NOTE: Lost sample count is never reset, since REV10.
+                manager.Write(bufferAddress + ReadOffsetPosition, 0UL);
+                manager.Write(bufferAddress + TotalSampleCountPosition, 0);
+            }
+        }
+
+        public AuxiliaryBufferInfo CpuBufferInfo;
+        public AuxiliaryBufferInfo DspBufferInfo;
+    }
+}
\ No newline at end of file
diff --git a/src/Ryujinx.Audio/Renderer/Dsp/State/BiquadFilterState.cs b/src/Ryujinx.Audio/Renderer/Dsp/State/BiquadFilterState.cs
new file mode 100644
index 00000000..4220e6d5
--- /dev/null
+++ b/src/Ryujinx.Audio/Renderer/Dsp/State/BiquadFilterState.cs
@@ -0,0 +1,13 @@
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Audio.Renderer.Dsp.State
+{
+    [StructLayout(LayoutKind.Sequential, Pack = 1, Size = 0x10)]
+    public struct BiquadFilterState
+    {
+        public float State0;
+        public float State1;
+        public float State2;
+        public float State3;
+    }
+}
\ No newline at end of file
diff --git a/src/Ryujinx.Audio/Renderer/Dsp/State/CompressorState.cs b/src/Ryujinx.Audio/Renderer/Dsp/State/CompressorState.cs
new file mode 100644
index 00000000..76aff807
--- /dev/null
+++ b/src/Ryujinx.Audio/Renderer/Dsp/State/CompressorState.cs
@@ -0,0 +1,51 @@
+using Ryujinx.Audio.Renderer.Dsp.Effect;
+using Ryujinx.Audio.Renderer.Parameter.Effect;
+
+namespace Ryujinx.Audio.Renderer.Dsp.State
+{
+    public class CompressorState
+    {
+        public ExponentialMovingAverage InputMovingAverage;
+        public float Unknown4;
+        public ExponentialMovingAverage CompressionGainAverage;
+        public float CompressorGainReduction;
+        public float Unknown10;
+        public float Unknown14;
+        public float PreviousCompressionEmaAlpha;
+        public float MakeupGain;
+        public float OutputGain;
+
+        public CompressorState(ref CompressorParameter parameter)
+        {
+            InputMovingAverage = new ExponentialMovingAverage(0.0f);
+            Unknown4 = 1.0f;
+            CompressionGainAverage = new ExponentialMovingAverage(1.0f);
+
+            UpdateParameter(ref parameter);
+        }
+
+        public void UpdateParameter(ref CompressorParameter parameter)
+        {
+            float threshold = parameter.Threshold;
+            float ratio = 1.0f / parameter.Ratio;
+            float attackCoefficient = parameter.AttackCoefficient;
+            float makeupGain;
+
+            if (parameter.MakeupGainEnabled)
+            {
+                makeupGain = (threshold * 0.5f * (ratio - 1.0f)) - 3.0f;
+            }
+            else
+            {
+                makeupGain = 0.0f;
+            }
+
+            PreviousCompressionEmaAlpha = attackCoefficient;
+            MakeupGain = makeupGain;
+            CompressorGainReduction = (1.0f - ratio) / Constants.ChannelCountMax;
+            Unknown10 = threshold - 1.5f;
+            Unknown14 = threshold + 1.5f;
+            OutputGain = FloatingPointHelper.DecibelToLinearExtended(parameter.OutputGain + makeupGain);
+        }
+    }
+}
diff --git a/src/Ryujinx.Audio/Renderer/Dsp/State/DelayState.cs b/src/Ryujinx.Audio/Renderer/Dsp/State/DelayState.cs
new file mode 100644
index 00000000..2a1e7f83
--- /dev/null
+++ b/src/Ryujinx.Audio/Renderer/Dsp/State/DelayState.cs
@@ -0,0 +1,67 @@
+using Ryujinx.Audio.Renderer.Dsp.Effect;
+using Ryujinx.Audio.Renderer.Parameter.Effect;
+using System.Runtime.CompilerServices;
+
+namespace Ryujinx.Audio.Renderer.Dsp.State
+{
+    public class DelayState
+    {
+        public DelayLine[] DelayLines { get; }
+        public float[] LowPassZ { get; set; }
+        public float FeedbackGain { get; private set; }
+        public float DelayFeedbackBaseGain { get; private set; }
+        public float DelayFeedbackCrossGain { get; private set; }
+        public float LowPassFeedbackGain { get; private set; }
+        public float LowPassBaseGain { get; private set; }
+
+        private const int FixedPointPrecision = 14;
+
+        public DelayState(ref DelayParameter parameter, ulong workBuffer)
+        {
+            DelayLines = new DelayLine[parameter.ChannelCount];
+            LowPassZ = new float[parameter.ChannelCount];
+
+            uint sampleRate = (uint)FixedPointHelper.ToInt(parameter.SampleRate, FixedPointPrecision) / 1000;
+
+            for (int i = 0; i < DelayLines.Length; i++)
+            {
+                DelayLines[i] = new DelayLine(sampleRate, parameter.DelayTimeMax);
+                DelayLines[i].SetDelay(parameter.DelayTime);
+            }
+
+            UpdateParameter(ref parameter);
+        }
+
+        public void UpdateParameter(ref DelayParameter parameter)
+        {
+            FeedbackGain = FixedPointHelper.ToFloat(parameter.FeedbackGain, FixedPointPrecision) * 0.98f;
+
+            float channelSpread = FixedPointHelper.ToFloat(parameter.ChannelSpread, FixedPointPrecision);
+
+            DelayFeedbackBaseGain = (1.0f - channelSpread) * FeedbackGain;
+
+            if (parameter.ChannelCount == 4 || parameter.ChannelCount == 6)
+            {
+                DelayFeedbackCrossGain = channelSpread * 0.5f * FeedbackGain;
+            }
+            else
+            {
+                DelayFeedbackCrossGain = channelSpread * FeedbackGain;
+            }
+
+            LowPassFeedbackGain = 0.95f * FixedPointHelper.ToFloat(parameter.LowPassAmount, FixedPointPrecision);
+            LowPassBaseGain = 1.0f - LowPassFeedbackGain;
+        }
+
+        public void UpdateLowPassFilter(ref float tempRawRef, uint channelCount)
+        {
+            for (int i = 0; i < channelCount; i++)
+            {
+                float lowPassResult = LowPassFeedbackGain * LowPassZ[i] + Unsafe.Add(ref tempRawRef, i) * LowPassBaseGain;
+
+                LowPassZ[i] = lowPassResult;
+                DelayLines[i].Update(lowPassResult);
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Ryujinx.Audio/Renderer/Dsp/State/LimiterState.cs b/src/Ryujinx.Audio/Renderer/Dsp/State/LimiterState.cs
new file mode 100644
index 00000000..0560757c
--- /dev/null
+++ b/src/Ryujinx.Audio/Renderer/Dsp/State/LimiterState.cs
@@ -0,0 +1,31 @@
+using Ryujinx.Audio.Renderer.Dsp.Effect;
+using Ryujinx.Audio.Renderer.Parameter.Effect;
+using System;
+
+namespace Ryujinx.Audio.Renderer.Dsp.State
+{
+    public class LimiterState
+    {
+        public ExponentialMovingAverage[] DetectorAverage;
+        public ExponentialMovingAverage[] CompressionGainAverage;
+        public float[] DelayedSampleBuffer;
+        public int[] DelayedSampleBufferPosition;
+
+        public LimiterState(ref LimiterParameter parameter, ulong workBuffer)
+        {
+            DetectorAverage = new ExponentialMovingAverage[parameter.ChannelCount];
+            CompressionGainAverage = new ExponentialMovingAverage[parameter.ChannelCount];
+            DelayedSampleBuffer = new float[parameter.ChannelCount * parameter.DelayBufferSampleCountMax];
+            DelayedSampleBufferPosition = new int[parameter.ChannelCount];
+
+            DetectorAverage.AsSpan().Fill(new ExponentialMovingAverage(0.0f));
+            CompressionGainAverage.AsSpan().Fill(new ExponentialMovingAverage(1.0f));
+            DelayedSampleBufferPosition.AsSpan().Fill(0);
+            DelayedSampleBuffer.AsSpan().Fill(0.0f);
+
+            UpdateParameter(ref parameter);
+        }
+
+        public void UpdateParameter(ref LimiterParameter parameter) { }
+    }
+}
\ No newline at end of file
diff --git a/src/Ryujinx.Audio/Renderer/Dsp/State/Reverb3dState.cs b/src/Ryujinx.Audio/Renderer/Dsp/State/Reverb3dState.cs
new file mode 100644
index 00000000..c0646603
--- /dev/null
+++ b/src/Ryujinx.Audio/Renderer/Dsp/State/Reverb3dState.cs
@@ -0,0 +1,119 @@
+using Ryujinx.Audio.Renderer.Dsp.Effect;
+using Ryujinx.Audio.Renderer.Parameter.Effect;
+using System;
+
+namespace Ryujinx.Audio.Renderer.Dsp.State
+{
+    public class Reverb3dState
+    {
+        private readonly float[] FdnDelayMinTimes = new float[4] { 5.0f, 6.0f, 13.0f, 14.0f };
+        private readonly float[] FdnDelayMaxTimes = new float[4] { 45.704f, 82.782f, 149.94f, 271.58f };
+        private readonly float[] DecayDelayMaxTimes1 = new float[4] { 17.0f, 13.0f, 9.0f, 7.0f };
+        private readonly float[] DecayDelayMaxTimes2 = new float[4] { 19.0f, 11.0f, 10.0f, 6.0f };
+        private readonly float[] EarlyDelayTimes = new float[20] { 0.017136f, 0.059154f, 0.16173f, 0.39019f, 0.42526f, 0.45541f, 0.68974f, 0.74591f, 0.83384f, 0.8595f, 0.0f, 0.075024f, 0.16879f, 0.2999f, 0.33744f, 0.3719f, 0.59901f, 0.71674f, 0.81786f, 0.85166f };
+        public readonly float[] EarlyGain = new float[20] { 0.67096f, 0.61027f, 1.0f, 0.35680f, 0.68361f, 0.65978f, 0.51939f, 0.24712f, 0.45945f, 0.45021f, 0.64196f, 0.54879f, 0.92925f, 0.38270f, 0.72867f, 0.69794f, 0.5464f, 0.24563f, 0.45214f, 0.44042f };
+
+        public IDelayLine[] FdnDelayLines { get; }
+        public DecayDelay[] DecayDelays1 { get; }
+        public DecayDelay[] DecayDelays2 { get; }
+        public IDelayLine PreDelayLine { get; }
+        public IDelayLine FrontCenterDelayLine { get; }
+        public float DryGain { get; private set; }
+        public uint[] EarlyDelayTime { get; private set; }
+        public float PreviousPreDelayValue { get; set; }
+        public float PreviousPreDelayGain { get; private set; }
+        public float TargetPreDelayGain { get; private set; }
+        public float EarlyReflectionsGain { get; private set; }
+        public float LateReverbGain { get; private set; }
+        public uint ReflectionDelayTime { get; private set; }
+        public float EchoLateReverbDecay { get; private set; }
+        public float[] DecayDirectFdnGain { get; private set; }
+        public float[] DecayCurrentFdnGain { get; private set; }
+        public float[] DecayCurrentOutputGain { get; private set; }
+        public float[] PreviousFeedbackOutputDecayed { get; private set; }
+
+        public Reverb3dState(ref Reverb3dParameter parameter, ulong workBuffer)
+        {
+            FdnDelayLines = new IDelayLine[4];
+            DecayDelays1 = new DecayDelay[4];
+            DecayDelays2 = new DecayDelay[4];
+            DecayDirectFdnGain = new float[4];
+            DecayCurrentFdnGain = new float[4];
+            DecayCurrentOutputGain = new float[4];
+            PreviousFeedbackOutputDecayed = new float[4];
+
+            uint sampleRate = parameter.SampleRate / 1000;
+
+            for (int i = 0; i < 4; i++)
+            {
+                FdnDelayLines[i] = new DelayLine3d(sampleRate, FdnDelayMaxTimes[i]);
+                DecayDelays1[i] = new DecayDelay(new DelayLine3d(sampleRate, DecayDelayMaxTimes1[i]));
+                DecayDelays2[i] = new DecayDelay(new DelayLine3d(sampleRate, DecayDelayMaxTimes2[i]));
+            }
+
+            PreDelayLine = new DelayLine3d(sampleRate, 400);
+            FrontCenterDelayLine = new DelayLine3d(sampleRate, 5);
+
+            UpdateParameter(ref parameter);
+        }
+
+        public void UpdateParameter(ref Reverb3dParameter parameter)
+        {
+            uint sampleRate = parameter.SampleRate / 1000;
+
+            EarlyDelayTime = new uint[20];
+            DryGain = parameter.DryGain;
+            PreviousFeedbackOutputDecayed.AsSpan().Fill(0);
+            PreviousPreDelayValue = 0;
+
+            EarlyReflectionsGain = FloatingPointHelper.Pow10(Math.Min(parameter.RoomGain + parameter.ReflectionsGain, 5000.0f) / 2000.0f);
+            LateReverbGain = FloatingPointHelper.Pow10(Math.Min(parameter.RoomGain + parameter.ReverbGain, 5000.0f) / 2000.0f);
+
+            float highFrequencyRoomGain = FloatingPointHelper.Pow10(parameter.RoomHf / 2000.0f);
+
+            if (highFrequencyRoomGain < 1.0f)
+            {
+                float tempA = 1.0f - highFrequencyRoomGain;
+                float tempB = 2.0f - ((2.0f * highFrequencyRoomGain) * FloatingPointHelper.Cos(256.0f * parameter.HfReference / parameter.SampleRate));
+                float tempC = MathF.Sqrt(MathF.Pow(tempB, 2) - (4.0f * (1.0f - highFrequencyRoomGain) * (1.0f - highFrequencyRoomGain)));
+
+                PreviousPreDelayGain = (tempB - tempC) / (2.0f * tempA);
+                TargetPreDelayGain = 1.0f - PreviousPreDelayGain;
+            }
+            else
+            {
+                PreviousPreDelayGain = 0.0f;
+                TargetPreDelayGain = 1.0f;
+            }
+
+            ReflectionDelayTime = IDelayLine.GetSampleCount(sampleRate, 1000.0f * (parameter.ReflectionDelay + parameter.ReverbDelayTime));
+            EchoLateReverbDecay = 0.6f * parameter.Diffusion * 0.01f;
+
+            for (int i = 0; i < FdnDelayLines.Length; i++)
+            {
+                FdnDelayLines[i].SetDelay(FdnDelayMinTimes[i] + (parameter.Density / 100 * (FdnDelayMaxTimes[i] - FdnDelayMinTimes[i])));
+
+                uint tempSampleCount = FdnDelayLines[i].CurrentSampleCount + DecayDelays1[i].CurrentSampleCount + DecayDelays2[i].CurrentSampleCount;
+
+                float tempA = (-60.0f * tempSampleCount) / (parameter.DecayTime * parameter.SampleRate);
+                float tempB = tempA / parameter.HfDecayRatio;
+                float tempC = FloatingPointHelper.Cos(128.0f * 0.5f * parameter.HfReference / parameter.SampleRate) / FloatingPointHelper.Sin(128.0f * 0.5f * parameter.HfReference / parameter.SampleRate);
+                float tempD = FloatingPointHelper.Pow10((tempB - tempA) / 40.0f);
+                float tempE = FloatingPointHelper.Pow10((tempB + tempA) / 40.0f) * 0.7071f;
+
+                DecayDirectFdnGain[i] = tempE * ((tempD * tempC) + 1.0f) / (tempC + tempD);
+                DecayCurrentFdnGain[i] = tempE * (1.0f - (tempD * tempC)) / (tempC + tempD);
+                DecayCurrentOutputGain[i] = (tempC - tempD) / (tempC + tempD);
+
+                DecayDelays1[i].SetDecayRate(EchoLateReverbDecay);
+                DecayDelays2[i].SetDecayRate(EchoLateReverbDecay * -0.9f);
+            }
+
+            for (int i = 0; i < EarlyDelayTime.Length; i++)
+            {
+                uint sampleCount = Math.Min(IDelayLine.GetSampleCount(sampleRate, (parameter.ReflectionDelay * 1000.0f) + (EarlyDelayTimes[i] * 1000.0f * ((parameter.ReverbDelayTime * 0.9998f) + 0.02f))), PreDelayLine.SampleCountMax);
+                EarlyDelayTime[i] = sampleCount;
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Ryujinx.Audio/Renderer/Dsp/State/ReverbState.cs b/src/Ryujinx.Audio/Renderer/Dsp/State/ReverbState.cs
new file mode 100644
index 00000000..1ffabe05
--- /dev/null
+++ b/src/Ryujinx.Audio/Renderer/Dsp/State/ReverbState.cs
@@ -0,0 +1,204 @@
+using Ryujinx.Audio.Renderer.Common;
+using Ryujinx.Audio.Renderer.Dsp.Effect;
+using Ryujinx.Audio.Renderer.Parameter.Effect;
+using System;
+
+namespace Ryujinx.Audio.Renderer.Dsp.State
+{
+    public class ReverbState
+    {
+        private static readonly float[] FdnDelayTimes = new float[20]
+        {
+            // Room
+            53.953247f, 79.192566f, 116.238770f, 130.615295f,
+            // Hall
+            53.953247f, 79.192566f, 116.238770f, 170.615295f,
+            // Plate
+            5f, 10f, 5f, 10f,
+            // Cathedral
+            47.03f, 71f, 103f, 170f,
+            // Max delay (Hall is the one with the highest values so identical to Hall)
+            53.953247f, 79.192566f, 116.238770f, 170.615295f,
+        };
+
+        private static readonly float[] DecayDelayTimes = new float[20]
+        {
+            // Room
+            7f, 9f, 13f, 17f,
+            // Hall
+            7f, 9f, 13f, 17f,
+            // Plate (no decay)
+            1f, 1f, 1f, 1f,
+            // Cathedral
+            7f, 7f, 13f, 9f,
+            // Max delay (Hall is the one with the highest values so identical to Hall)
+            7f, 9f, 13f, 17f,
+        };
+
+        private static readonly float[] EarlyDelayTimes = new float[50]
+        {
+            // Room
+            0.0f, 3.5f, 2.8f, 3.9f, 2.7f, 13.4f, 7.9f, 8.4f, 9.9f, 12.0f,
+            // Chamber
+            0.0f, 11.8f, 5.5f, 11.2f, 10.4f, 38.1f, 22.2f, 29.6f, 21.2f, 24.8f,
+            // Hall
+            0.0f, 41.5f, 20.5f, 41.3f, 0.0f, 29.5f, 33.8f, 45.2f, 46.8f, 0.0f,
+            // Cathedral
+            33.1f, 43.3f, 22.8f, 37.9f, 14.9f, 35.3f, 17.9f, 34.2f, 0.0f, 43.3f,
+            // Disabled
+            0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f
+        };
+
+        private static readonly float[] EarlyGainBase = new float[50]
+        {
+            // Room
+            0.70f, 0.68f, 0.70f, 0.68f, 0.70f, 0.68f, 0.70f, 0.68f, 0.68f, 0.68f,
+            // Chamber
+            0.70f, 0.68f, 0.70f, 0.68f, 0.70f, 0.68f, 0.68f, 0.68f, 0.68f, 0.68f, 
+            // Hall
+            0.50f, 0.70f, 0.70f, 0.68f, 0.50f, 0.68f, 0.68f, 0.70f, 0.68f, 0.00f,
+            // Cathedral
+            0.93f, 0.92f, 0.87f, 0.86f, 0.94f, 0.81f, 0.80f, 0.77f, 0.76f, 0.65f,
+            // Disabled
+            0.00f, 0.00f, 0.00f, 0.00f, 0.00f, 0.00f, 0.00f, 0.00f, 0.00f, 0.00f
+        };
+
+        private static readonly float[] PreDelayTimes = new float[5]
+        {
+            // Room
+            12.5f,
+            // Chamber
+            40.0f,
+            // Hall
+            50.0f,
+            // Cathedral
+            50.0f,
+            // Disabled
+            0.0f
+        };
+
+        public DelayLine[] FdnDelayLines { get; }
+        public DecayDelay[] DecayDelays { get; }
+        public DelayLine PreDelayLine { get; }
+        public DelayLine FrontCenterDelayLine { get; }
+        public uint[] EarlyDelayTime { get; }
+        public float[] EarlyGain { get; }
+        public uint PreDelayLineDelayTime { get; private set; }
+
+        public float[] HighFrequencyDecayDirectGain { get; }
+        public float[] HighFrequencyDecayPreviousGain { get; }
+        public float[] PreviousFeedbackOutput { get; }
+
+        public const int EarlyModeCount = 10;
+
+        private const int FixedPointPrecision = 14;
+
+        private ReadOnlySpan<float> GetFdnDelayTimesByLateMode(ReverbLateMode lateMode)
+        {
+            return FdnDelayTimes.AsSpan((int)lateMode * 4, 4);
+        }
+
+        private ReadOnlySpan<float> GetDecayDelayTimesByLateMode(ReverbLateMode lateMode)
+        {
+            return DecayDelayTimes.AsSpan((int)lateMode * 4, 4);
+        }
+
+        public ReverbState(ref ReverbParameter parameter, ulong workBuffer, bool isLongSizePreDelaySupported)
+        {
+            FdnDelayLines = new DelayLine[4];
+            DecayDelays = new DecayDelay[4];
+            EarlyDelayTime = new uint[EarlyModeCount];
+            EarlyGain = new float[EarlyModeCount];
+            HighFrequencyDecayDirectGain = new float[4];
+            HighFrequencyDecayPreviousGain = new float[4];
+            PreviousFeedbackOutput = new float[4];
+
+            ReadOnlySpan<float> fdnDelayTimes = GetFdnDelayTimesByLateMode(ReverbLateMode.Limit);
+            ReadOnlySpan<float> decayDelayTimes = GetDecayDelayTimesByLateMode(ReverbLateMode.Limit);
+
+            uint sampleRate = (uint)FixedPointHelper.ToFloat((uint)parameter.SampleRate, FixedPointPrecision);
+
+            for (int i = 0; i < 4; i++)
+            {
+                FdnDelayLines[i] = new DelayLine(sampleRate, fdnDelayTimes[i]);
+                DecayDelays[i] = new DecayDelay(new DelayLine(sampleRate, decayDelayTimes[i]));
+            }
+
+            float preDelayTimeMax = 150.0f;
+
+            if (isLongSizePreDelaySupported)
+            {
+                preDelayTimeMax = 350.0f;
+            }
+
+            PreDelayLine = new DelayLine(sampleRate, preDelayTimeMax);
+            FrontCenterDelayLine = new DelayLine(sampleRate, 5.0f);
+
+            UpdateParameter(ref parameter);
+        }
+
+        public void UpdateParameter(ref ReverbParameter parameter)
+        {
+            uint sampleRate = (uint)FixedPointHelper.ToFloat((uint)parameter.SampleRate, FixedPointPrecision);
+
+            float preDelayTimeInMilliseconds = FixedPointHelper.ToFloat(parameter.PreDelayTime, FixedPointPrecision);
+            float earlyGain = FixedPointHelper.ToFloat(parameter.EarlyGain, FixedPointPrecision);
+            float coloration = FixedPointHelper.ToFloat(parameter.Coloration, FixedPointPrecision);
+            float decayTime = FixedPointHelper.ToFloat(parameter.DecayTime, FixedPointPrecision);
+
+            for (int i = 0; i < 10; i++)
+            {
+                EarlyDelayTime[i] = Math.Min(IDelayLine.GetSampleCount(sampleRate, EarlyDelayTimes[i] + preDelayTimeInMilliseconds), PreDelayLine.SampleCountMax) + 1;
+                EarlyGain[i] = EarlyGainBase[i] * earlyGain;
+            }
+
+            if (parameter.ChannelCount == 2)
+            {
+                EarlyGain[4] = EarlyGain[4] * 0.5f;
+                EarlyGain[5] = EarlyGain[5] * 0.5f;
+            }
+
+            PreDelayLineDelayTime = Math.Min(IDelayLine.GetSampleCount(sampleRate, PreDelayTimes[(int)parameter.EarlyMode] + preDelayTimeInMilliseconds), PreDelayLine.SampleCountMax);
+
+            ReadOnlySpan<float> fdnDelayTimes = GetFdnDelayTimesByLateMode(parameter.LateMode);
+            ReadOnlySpan<float> decayDelayTimes = GetDecayDelayTimesByLateMode(parameter.LateMode);
+
+            float highFrequencyDecayRatio = FixedPointHelper.ToFloat(parameter.HighFrequencyDecayRatio, FixedPointPrecision);
+            float highFrequencyUnknownValue = FloatingPointHelper.Cos(1280.0f / sampleRate);
+
+            for (int i = 0; i < 4; i++)
+            {
+                FdnDelayLines[i].SetDelay(fdnDelayTimes[i]);
+                DecayDelays[i].SetDelay(decayDelayTimes[i]);
+
+                float tempA = -3 * (DecayDelays[i].CurrentSampleCount + FdnDelayLines[i].CurrentSampleCount);
+                float tempB = tempA / (decayTime * sampleRate);
+                float tempC;
+                float tempD;
+
+                if (highFrequencyDecayRatio < 0.995f)
+                {
+                    float tempE = FloatingPointHelper.Pow10((((1.0f / highFrequencyDecayRatio) - 1.0f) * 2) / 100 * (tempB / 10));
+                    float tempF = 1.0f - tempE;
+                    float tempG = 2.0f - (tempE * 2 * highFrequencyUnknownValue);
+                    float tempH = MathF.Sqrt((tempG * tempG) - (tempF * tempF * 4));
+
+                    tempC = (tempG - tempH) / (tempF * 2);
+                    tempD = 1.0f - tempC;
+                }
+                else
+                {
+                    // no high frequency decay ratio
+                    tempC = 0.0f;
+                    tempD = 1.0f;
+                }
+
+                HighFrequencyDecayDirectGain[i] = FloatingPointHelper.Pow10(tempB / 1000) * tempD * 0.7071f;
+                HighFrequencyDecayPreviousGain[i] = tempC;
+                PreviousFeedbackOutput[i] = 0.0f;
+
+                DecayDelays[i].SetDecayRate(0.6f * (1.0f - coloration));
+            }
+        }
+    }
+}
\ No newline at end of file