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//
// 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 Ryujinx.Audio.Renderer.Parameter;
using Ryujinx.Common.Utilities;
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
namespace Ryujinx.Audio.Renderer.Server.Splitter
{
/// <summary>
/// Server state for a splitter destination.
/// </summary>
[StructLayout(LayoutKind.Sequential, Size = 0xE0, Pack = Alignment)]
public struct SplitterDestination
{
public const int Alignment = 0x10;
/// <summary>
/// The unique id of this <see cref="SplitterDestination"/>.
/// </summary>
public int Id;
/// <summary>
/// The mix to output the result of the splitter.
/// </summary>
public int DestinationId;
/// <summary>
/// Mix buffer volumes storage.
/// </summary>
private MixArray _mix;
private MixArray _previousMix;
/// <summary>
/// Pointer to the next linked element.
/// </summary>
private unsafe SplitterDestination* _next;
/// <summary>
/// Set to true if in use.
/// </summary>
[MarshalAs(UnmanagedType.I1)]
public bool IsUsed;
/// <summary>
/// Set to true if the internal state need to be updated.
/// </summary>
[MarshalAs(UnmanagedType.I1)]
public bool NeedToUpdateInternalState;
[StructLayout(LayoutKind.Sequential, Size = 4 * Constants.MixBufferCountMax, Pack = 1)]
private struct MixArray { }
/// <summary>
/// Mix buffer volumes.
/// </summary>
/// <remarks>Used when a splitter id is specified in the mix.</remarks>
public Span<float> MixBufferVolume => SpanHelpers.AsSpan<MixArray, float>(ref _mix);
/// <summary>
/// Previous mix buffer volumes.
/// </summary>
/// <remarks>Used when a splitter id is specified in the mix.</remarks>
public Span<float> PreviousMixBufferVolume => SpanHelpers.AsSpan<MixArray, float>(ref _previousMix);
/// <summary>
/// Get the <see cref="Span{SplitterDestination}"/> of the next element or <see cref="Span{SplitterDestination}.Empty"/> if not present.
/// </summary>
public Span<SplitterDestination> Next
{
get
{
unsafe
{
return _next != null ? new Span<SplitterDestination>(_next, 1) : Span<SplitterDestination>.Empty;
}
}
}
/// <summary>
/// Create a new <see cref="SplitterDestination"/>.
/// </summary>
/// <param name="id">The unique id of this <see cref="SplitterDestination"/>.</param>
public SplitterDestination(int id) : this()
{
Id = id;
DestinationId = Constants.UnusedMixId;
ClearVolumes();
}
/// <summary>
/// Update the <see cref="SplitterDestination"/> from user parameter.
/// </summary>
/// <param name="parameter">The user parameter.</param>
public void Update(SplitterDestinationInParameter parameter)
{
Debug.Assert(Id == parameter.Id);
if (parameter.IsMagicValid() && Id == parameter.Id)
{
DestinationId = parameter.DestinationId;
parameter.MixBufferVolume.CopyTo(MixBufferVolume);
if (!IsUsed && parameter.IsUsed)
{
MixBufferVolume.CopyTo(PreviousMixBufferVolume);
NeedToUpdateInternalState = false;
}
IsUsed = parameter.IsUsed;
}
}
/// <summary>
/// Update the internal state of the instance.
/// </summary>
public void UpdateInternalState()
{
if (IsUsed && NeedToUpdateInternalState)
{
MixBufferVolume.CopyTo(PreviousMixBufferVolume);
}
NeedToUpdateInternalState = false;
}
/// <summary>
/// Set the update internal state marker.
/// </summary>
public void MarkAsNeedToUpdateInternalState()
{
NeedToUpdateInternalState = true;
}
/// <summary>
/// Return true if the <see cref="SplitterDestination"/> is used and has a destination.
/// </summary>
/// <returns>True if the <see cref="SplitterDestination"/> is used and has a destination.</returns>
public bool IsConfigured()
{
return IsUsed && DestinationId != Constants.UnusedMixId;
}
/// <summary>
/// Get the volume for a given destination.
/// </summary>
/// <param name="destinationIndex">The destination index to use.</param>
/// <returns>The volume for the given destination.</returns>
public float GetMixVolume(int destinationIndex)
{
Debug.Assert(destinationIndex >= 0 && destinationIndex < Constants.MixBufferCountMax);
return MixBufferVolume[destinationIndex];
}
/// <summary>
/// Clear the volumes.
/// </summary>
public void ClearVolumes()
{
MixBufferVolume.Fill(0);
PreviousMixBufferVolume.Fill(0);
}
/// <summary>
/// Link the next element to the given <see cref="SplitterDestination"/>.
/// </summary>
/// <param name="next">The given <see cref="SplitterDestination"/> to link.</param>
public void Link(ref SplitterDestination next)
{
unsafe
{
fixed (SplitterDestination *nextPtr = &next)
{
_next = nextPtr;
}
}
}
/// <summary>
/// Remove the link to the next element.
/// </summary>
public void Unlink()
{
unsafe
{
_next = null;
}
}
}
}
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