/// <summary>
/// Creates a new <see cref="Buffer{T}"/> instance with the specified parameters.
/// </summary>
/// <param name="device">The <see cref="GraphicsDevice"/> associated with the current instance.</param>
/// <param name="length">The number of items to store in the current buffer.</param>
/// <param name="elementSizeInBytes">The size in bytes of each buffer item (including padding, if any).</param>
/// <param name="resourceType">The resource type for the current buffer.</param>
/// <param name="allocationMode">The allocation mode to use for the new resource.</param>
private protected Buffer(GraphicsDevice device, int length, uint elementSizeInBytes, ResourceType resourceType, AllocationMode allocationMode)
{
device.ThrowIfDisposed();
if (resourceType == ResourceType.Constant)
{
Guard.IsBetweenOrEqualTo(length, 1, FX.D3D12_REQ_CONSTANT_BUFFER_ELEMENT_COUNT, nameof(length));
}
else
{
// The maximum length is set such that the aligned buffer size can't exceed uint.MaxValue
Guard.IsBetweenOrEqualTo(length, 1, (uint.MaxValue / elementSizeInBytes) & ~255, nameof(length));
}
if (TypeInfo <T> .IsDoubleOrContainsDoubles &&
device.D3D12Device->CheckFeatureSupport <D3D12_FEATURE_DATA_D3D12_OPTIONS>(D3D12_FEATURE_D3D12_OPTIONS).DoublePrecisionFloatShaderOps == 0)
{
UnsupportedDoubleOperationsException.Throw <T>();
}
SizeInBytes = checked ((nint)(length * elementSizeInBytes));
GraphicsDevice = device;
Length = length;
if (device.IsCacheCoherentUMA)
{
this.d3D12Resource = device.D3D12Device->CreateCommittedResource(resourceType, allocationMode, (ulong)SizeInBytes, true);
}
else
{
this.allocation = device.Allocator->CreateResource(resourceType, allocationMode, (ulong)SizeInBytes);
this.d3D12Resource = new ComPtr <ID3D12Resource>(this.allocation.Get()->GetResource());
}
device.RentShaderResourceViewDescriptorHandles(out D3D12CpuDescriptorHandle, out D3D12GpuDescriptorHandle);
switch (resourceType)
{
case ResourceType.Constant:
device.D3D12Device->CreateConstantBufferView(this.d3D12Resource.Get(), SizeInBytes, D3D12CpuDescriptorHandle);
break;
case ResourceType.ReadOnly:
device.D3D12Device->CreateShaderResourceView(this.d3D12Resource.Get(), (uint)length, elementSizeInBytes, D3D12CpuDescriptorHandle);
break;
case ResourceType.ReadWrite:
device.D3D12Device->CreateUnorderedAccessView(this.d3D12Resource.Get(), (uint)length, elementSizeInBytes, D3D12CpuDescriptorHandle);
break;
}
this.d3D12Resource.Get()->SetName(this);
}
/// <summary>
/// Creates a new <see cref="Buffer{T}"/> instance with the specified parameters.
/// </summary>
/// <param name="device">The <see cref="GraphicsDevice"/> associated with the current instance.</param>
/// <param name="length">The number of items to store in the current buffer.</param>
/// <param name="elementSizeInBytes">The size in bytes of each buffer item (including padding, if any).</param>
/// <param name="resourceType">The resource type for the current buffer.</param>
/// <param name="allocationMode">The allocation mode to use for the new resource.</param>
private protected Buffer(GraphicsDevice device, int length, uint elementSizeInBytes, ResourceType resourceType, AllocationMode allocationMode)
{
device.ThrowIfDisposed();
if (resourceType == ResourceType.Constant)
{
Guard.IsBetweenOrEqualTo(length, 1, D3D12.D3D12_REQ_CONSTANT_BUFFER_ELEMENT_COUNT, nameof(length));
}
else
{
// The maximum length is set such that the aligned buffer size can't exceed uint.MaxValue
Guard.IsBetweenOrEqualTo(length, 1, (uint.MaxValue / elementSizeInBytes) & ~255, nameof(length));
}
if (TypeInfo <T> .IsDoubleOrContainsDoubles &&
device.D3D12Device->CheckFeatureSupport <D3D12_FEATURE_DATA_D3D12_OPTIONS>(D3D12_FEATURE_D3D12_OPTIONS).DoublePrecisionFloatShaderOps == 0)
{
UnsupportedDoubleOperationsException.Throw <T>();
}
nint usableSizeInBytes = checked ((nint)(length * elementSizeInBytes));
nint effectiveSizeInBytes = resourceType == ResourceType.Constant ? AlignmentHelper.Pad(usableSizeInBytes, D3D12.D3D12_CONSTANT_BUFFER_DATA_PLACEMENT_ALIGNMENT) : usableSizeInBytes;
SizeInBytes = usableSizeInBytes;
GraphicsDevice = device;
Length = length;
#if NET6_0_OR_GREATER
this.allocation = device.Allocator->CreateResource(device.Pool, resourceType, allocationMode, (ulong)effectiveSizeInBytes);
this.d3D12Resource = new ComPtr <ID3D12Resource>(this.allocation.Get()->GetResource());
#else
this.d3D12Resource = device.D3D12Device->CreateCommittedResource(resourceType, (ulong)effectiveSizeInBytes, device.IsCacheCoherentUMA);
#endif
device.RegisterAllocatedResource();
device.RentShaderResourceViewDescriptorHandles(out this.d3D12ResourceDescriptorHandles);
device.RentShaderResourceViewDescriptorHandles(out this.d3D12ResourceDescriptorHandlesForTypedUnorderedAccessView);
switch (resourceType)
{
case ResourceType.Constant:
device.D3D12Device->CreateConstantBufferView(this.d3D12Resource.Get(), effectiveSizeInBytes, this.d3D12ResourceDescriptorHandles.D3D12CpuDescriptorHandle);
break;
case ResourceType.ReadOnly:
device.D3D12Device->CreateShaderResourceView(this.d3D12Resource.Get(), (uint)length, elementSizeInBytes, this.d3D12ResourceDescriptorHandles.D3D12CpuDescriptorHandle);
break;
case ResourceType.ReadWrite:
device.D3D12Device->CreateUnorderedAccessView(this.d3D12Resource.Get(), (uint)length, elementSizeInBytes, this.d3D12ResourceDescriptorHandles.D3D12CpuDescriptorHandle);
device.D3D12Device->CreateUnorderedAccessViewForClear(
this.d3D12Resource.Get(),
DXGI_FORMAT_R32_UINT,
(uint)(usableSizeInBytes / sizeof(uint)),
this.d3D12ResourceDescriptorHandlesForTypedUnorderedAccessView.D3D12CpuDescriptorHandle,
this.d3D12ResourceDescriptorHandlesForTypedUnorderedAccessView.D3D12CpuDescriptorHandleNonShaderVisible);
break;
}
this.d3D12Resource.Get()->SetName(this);
}
