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using Silk.NET.Vulkan;
using System;
using System.Diagnostics;
namespace Ryujinx.Graphics.Vulkan
{
class DescriptorSetManager : IDisposable
{
private const uint DescriptorPoolMultiplier = 16;
public class DescriptorPoolHolder : IDisposable
{
public Vk Api { get; }
public Device Device { get; }
private readonly DescriptorPool _pool;
private readonly uint _capacity;
private int _totalSets;
private int _setsInUse;
private bool _done;
public unsafe DescriptorPoolHolder(Vk api, Device device)
{
Api = api;
Device = device;
var poolSizes = new DescriptorPoolSize[]
{
new DescriptorPoolSize(DescriptorType.UniformBuffer, (1 + Constants.MaxUniformBufferBindings) * DescriptorPoolMultiplier),
new DescriptorPoolSize(DescriptorType.StorageBuffer, Constants.MaxStorageBufferBindings * DescriptorPoolMultiplier),
new DescriptorPoolSize(DescriptorType.CombinedImageSampler, Constants.MaxTextureBindings * DescriptorPoolMultiplier),
new DescriptorPoolSize(DescriptorType.StorageImage, Constants.MaxImageBindings * DescriptorPoolMultiplier),
new DescriptorPoolSize(DescriptorType.UniformTexelBuffer, Constants.MaxTextureBindings * DescriptorPoolMultiplier),
new DescriptorPoolSize(DescriptorType.StorageTexelBuffer, Constants.MaxImageBindings * DescriptorPoolMultiplier)
};
uint maxSets = (uint)poolSizes.Length * DescriptorPoolMultiplier;
_capacity = maxSets;
fixed (DescriptorPoolSize* pPoolsSize = poolSizes)
{
var descriptorPoolCreateInfo = new DescriptorPoolCreateInfo()
{
SType = StructureType.DescriptorPoolCreateInfo,
MaxSets = maxSets,
PoolSizeCount = (uint)poolSizes.Length,
PPoolSizes = pPoolsSize
};
Api.CreateDescriptorPool(device, descriptorPoolCreateInfo, null, out _pool).ThrowOnError();
}
}
public unsafe DescriptorSetCollection AllocateDescriptorSets(ReadOnlySpan<DescriptorSetLayout> layouts)
{
TryAllocateDescriptorSets(layouts, isTry: false, out var dsc);
return dsc;
}
public bool TryAllocateDescriptorSets(ReadOnlySpan<DescriptorSetLayout> layouts, out DescriptorSetCollection dsc)
{
return TryAllocateDescriptorSets(layouts, isTry: true, out dsc);
}
private unsafe bool TryAllocateDescriptorSets(ReadOnlySpan<DescriptorSetLayout> layouts, 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)_capacity;
_done = true;
DestroyIfDone();
dsc = default;
return false;
}
result.ThrowOnError();
}
}
_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 count)
{
if (_totalSets + count <= _capacity)
{
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()
{
Dispose(true);
}
}
private readonly Device _device;
private DescriptorPoolHolder _currentPool;
public DescriptorSetManager(Device device)
{
_device = device;
}
public Auto<DescriptorSetCollection> AllocateDescriptorSet(Vk api, DescriptorSetLayout layout)
{
Span<DescriptorSetLayout> layouts = stackalloc DescriptorSetLayout[1];
layouts[0] = layout;
return AllocateDescriptorSets(api, layouts);
}
public Auto<DescriptorSetCollection> AllocateDescriptorSets(Vk api, ReadOnlySpan<DescriptorSetLayout> layouts)
{
// If we fail the first time, just create a new pool and try again.
if (!GetPool(api, layouts.Length).TryAllocateDescriptorSets(layouts, out var dsc))
{
dsc = GetPool(api, layouts.Length).AllocateDescriptorSets(layouts);
}
return new Auto<DescriptorSetCollection>(dsc);
}
private DescriptorPoolHolder GetPool(Vk api, int requiredCount)
{
if (_currentPool == null || !_currentPool.CanFit(requiredCount))
{
_currentPool = new DescriptorPoolHolder(api, _device);
}
return _currentPool;
}
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
unsafe
{
_currentPool?.Dispose();
}
}
}
public void Dispose()
{
Dispose(true);
}
}
}
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