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using System;
using System.Diagnostics;
using System.Threading;
namespace Ryujinx.Graphics.Vulkan
{
interface IAuto
{
bool HasCommandBufferDependency(CommandBufferScoped cbs);
void IncrementReferenceCount();
void DecrementReferenceCount(int cbIndex);
void DecrementReferenceCount();
}
interface IAutoPrivate : IAuto
{
void AddCommandBufferDependencies(CommandBufferScoped cbs);
}
interface IMirrorable<T> where T : IDisposable
{
Auto<T> GetMirrorable(CommandBufferScoped cbs, ref int offset, int size, out bool mirrored);
void ClearMirrors(CommandBufferScoped cbs, int offset, int size);
}
class Auto<T> : IAutoPrivate, IDisposable where T : IDisposable
{
private int _referenceCount;
private T _value;
private readonly BitMap _cbOwnership;
private readonly MultiFenceHolder _waitable;
private readonly IAutoPrivate[] _referencedObjs;
private readonly IMirrorable<T> _mirrorable;
private bool _disposed;
private bool _destroyed;
public Auto(T value)
{
_referenceCount = 1;
_value = value;
_cbOwnership = new BitMap(CommandBufferPool.MaxCommandBuffers);
}
public Auto(T value, IMirrorable<T> mirrorable, MultiFenceHolder waitable, params IAutoPrivate[] referencedObjs) : this(value, waitable, referencedObjs)
{
_mirrorable = mirrorable;
}
public Auto(T value, MultiFenceHolder waitable, params IAutoPrivate[] referencedObjs) : this(value)
{
_waitable = waitable;
_referencedObjs = referencedObjs;
for (int i = 0; i < referencedObjs.Length; i++)
{
referencedObjs[i].IncrementReferenceCount();
}
}
public T GetMirrorable(CommandBufferScoped cbs, ref int offset, int size, out bool mirrored)
{
var mirror = _mirrorable.GetMirrorable(cbs, ref offset, size, out mirrored);
mirror._waitable?.AddBufferUse(cbs.CommandBufferIndex, offset, size, false);
return mirror.Get(cbs);
}
public T Get(CommandBufferScoped cbs, int offset, int size, bool write = false)
{
_mirrorable?.ClearMirrors(cbs, offset, size);
_waitable?.AddBufferUse(cbs.CommandBufferIndex, offset, size, write);
return Get(cbs);
}
public T GetUnsafe()
{
return _value;
}
public T Get(CommandBufferScoped cbs)
{
if (!_destroyed)
{
AddCommandBufferDependencies(cbs);
}
return _value;
}
public bool HasCommandBufferDependency(CommandBufferScoped cbs)
{
return _cbOwnership.IsSet(cbs.CommandBufferIndex);
}
public bool HasRentedCommandBufferDependency(CommandBufferPool cbp)
{
return _cbOwnership.AnySet();
}
public void AddCommandBufferDependencies(CommandBufferScoped cbs)
{
// We don't want to add a reference to this object to the command buffer
// more than once, so if we detect that the command buffer already has ownership
// of this object, then we can just return without doing anything else.
if (_cbOwnership.Set(cbs.CommandBufferIndex))
{
if (_waitable != null)
{
cbs.AddWaitable(_waitable);
}
cbs.AddDependant(this);
// We need to add a dependency on the command buffer to all objects this object
// references aswell.
if (_referencedObjs != null)
{
for (int i = 0; i < _referencedObjs.Length; i++)
{
_referencedObjs[i].AddCommandBufferDependencies(cbs);
}
}
}
}
public bool TryIncrementReferenceCount()
{
int lastValue;
do
{
lastValue = _referenceCount;
if (lastValue == 0)
{
return false;
}
}
while (Interlocked.CompareExchange(ref _referenceCount, lastValue + 1, lastValue) != lastValue);
return true;
}
public void IncrementReferenceCount()
{
if (Interlocked.Increment(ref _referenceCount) == 1)
{
Interlocked.Decrement(ref _referenceCount);
throw new InvalidOperationException("Attempted to increment the reference count of an object that was already destroyed.");
}
}
public void DecrementReferenceCount(int cbIndex)
{
_cbOwnership.Clear(cbIndex);
DecrementReferenceCount();
}
public void DecrementReferenceCount()
{
if (Interlocked.Decrement(ref _referenceCount) == 0)
{
_value.Dispose();
_value = default;
_destroyed = true;
// Value is no longer in use by the GPU, dispose all other
// resources that it references.
if (_referencedObjs != null)
{
for (int i = 0; i < _referencedObjs.Length; i++)
{
_referencedObjs[i].DecrementReferenceCount();
}
}
}
Debug.Assert(_referenceCount >= 0);
}
public void Dispose()
{
if (!_disposed)
{
DecrementReferenceCount();
_disposed = true;
}
}
}
}
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