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using Silk.NET.Vulkan;
using System;
using System.Diagnostics;
namespace Ryujinx.Graphics.Vulkan
{
class DescriptorSetManager : IDisposable
{
public const uint MaxSets = 8;
public class DescriptorPoolHolder : IDisposable
{
public Vk Api { get; }
public Device Device { get; }
private readonly DescriptorPool _pool;
private int _freeDescriptors;
private int _totalSets;
private int _setsInUse;
private bool _done;
public unsafe DescriptorPoolHolder(Vk api, Device device, ReadOnlySpan<DescriptorPoolSize> poolSizes, bool updateAfterBind)
{
Api = api;
Device = device;
foreach (var poolSize in poolSizes)
{
_freeDescriptors += (int)poolSize.DescriptorCount;
}
fixed (DescriptorPoolSize* pPoolsSize = poolSizes)
{
var descriptorPoolCreateInfo = new DescriptorPoolCreateInfo
{
SType = StructureType.DescriptorPoolCreateInfo,
Flags = updateAfterBind ? DescriptorPoolCreateFlags.UpdateAfterBindBit : DescriptorPoolCreateFlags.None,
MaxSets = MaxSets,
PoolSizeCount = (uint)poolSizes.Length,
PPoolSizes = pPoolsSize,
};
Api.CreateDescriptorPool(device, descriptorPoolCreateInfo, null, out _pool).ThrowOnError();
}
}
public unsafe DescriptorSetCollection AllocateDescriptorSets(ReadOnlySpan<DescriptorSetLayout> layouts, int consumedDescriptors)
{
TryAllocateDescriptorSets(layouts, consumedDescriptors, isTry: false, out var dsc);
return dsc;
}
public bool TryAllocateDescriptorSets(ReadOnlySpan<DescriptorSetLayout> layouts, int consumedDescriptors, out DescriptorSetCollection dsc)
{
return TryAllocateDescriptorSets(layouts, consumedDescriptors, isTry: true, out dsc);
}
private unsafe bool TryAllocateDescriptorSets(
ReadOnlySpan<DescriptorSetLayout> layouts,
int consumedDescriptors,
bool isTry,
out DescriptorSetCollection dsc)
{
Debug.Assert(!_done);
DescriptorSet[] descriptorSets = new DescriptorSet[layouts.Length];
fixed (DescriptorSet* pDescriptorSets = descriptorSets)
{
fixed (DescriptorSetLayout* pLayouts = layouts)
{
var descriptorSetAllocateInfo = new DescriptorSetAllocateInfo
{
SType = StructureType.DescriptorSetAllocateInfo,
DescriptorPool = _pool,
DescriptorSetCount = (uint)layouts.Length,
PSetLayouts = pLayouts,
};
var result = Api.AllocateDescriptorSets(Device, &descriptorSetAllocateInfo, pDescriptorSets);
if (isTry && result == Result.ErrorOutOfPoolMemory)
{
_totalSets = (int)MaxSets;
_done = true;
DestroyIfDone();
dsc = default;
return false;
}
result.ThrowOnError();
}
}
_freeDescriptors -= consumedDescriptors;
_totalSets += layouts.Length;
_setsInUse += layouts.Length;
dsc = new DescriptorSetCollection(this, descriptorSets);
return true;
}
public void FreeDescriptorSets(DescriptorSetCollection dsc)
{
_setsInUse -= dsc.SetsCount;
Debug.Assert(_setsInUse >= 0);
DestroyIfDone();
}
public bool CanFit(int setsCount, int descriptorsCount)
{
// Try to determine if an allocation with the given parameters will succeed.
// An allocation may fail if the sets count or descriptors count exceeds the available counts
// of the pool.
// Not getting that right is not fatal, it will just create a new pool and try again,
// but it is less efficient.
if (_totalSets + setsCount <= MaxSets && _freeDescriptors >= descriptorsCount)
{
return true;
}
_done = true;
DestroyIfDone();
return false;
}
private unsafe void DestroyIfDone()
{
if (_done && _setsInUse == 0)
{
Api.DestroyDescriptorPool(Device, _pool, null);
}
}
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
unsafe
{
Api.DestroyDescriptorPool(Device, _pool, null);
}
}
}
public void Dispose()
{
GC.SuppressFinalize(this);
Dispose(true);
}
}
private readonly Device _device;
private readonly DescriptorPoolHolder[] _currentPools;
public DescriptorSetManager(Device device, int poolCount)
{
_device = device;
_currentPools = new DescriptorPoolHolder[poolCount];
}
public Auto<DescriptorSetCollection> AllocateDescriptorSet(
Vk api,
DescriptorSetLayout layout,
ReadOnlySpan<DescriptorPoolSize> poolSizes,
int poolIndex,
int consumedDescriptors,
bool updateAfterBind)
{
Span<DescriptorSetLayout> layouts = stackalloc DescriptorSetLayout[1];
layouts[0] = layout;
return AllocateDescriptorSets(api, layouts, poolSizes, poolIndex, consumedDescriptors, updateAfterBind);
}
public Auto<DescriptorSetCollection> AllocateDescriptorSets(
Vk api,
ReadOnlySpan<DescriptorSetLayout> layouts,
ReadOnlySpan<DescriptorPoolSize> poolSizes,
int poolIndex,
int consumedDescriptors,
bool updateAfterBind)
{
// If we fail the first time, just create a new pool and try again.
var pool = GetPool(api, poolSizes, poolIndex, layouts.Length, consumedDescriptors, updateAfterBind);
if (!pool.TryAllocateDescriptorSets(layouts, consumedDescriptors, out var dsc))
{
pool = GetPool(api, poolSizes, poolIndex, layouts.Length, consumedDescriptors, updateAfterBind);
dsc = pool.AllocateDescriptorSets(layouts, consumedDescriptors);
}
return new Auto<DescriptorSetCollection>(dsc);
}
private DescriptorPoolHolder GetPool(
Vk api,
ReadOnlySpan<DescriptorPoolSize> poolSizes,
int poolIndex,
int setsCount,
int descriptorsCount,
bool updateAfterBind)
{
ref DescriptorPoolHolder currentPool = ref _currentPools[poolIndex];
if (currentPool == null || !currentPool.CanFit(setsCount, descriptorsCount))
{
currentPool = new DescriptorPoolHolder(api, _device, poolSizes, updateAfterBind);
}
return currentPool;
}
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
for (int index = 0; index < _currentPools.Length; index++)
{
_currentPools[index]?.Dispose();
_currentPools[index] = null;
}
}
}
public void Dispose()
{
GC.SuppressFinalize(this);
Dispose(true);
}
}
}
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