/// <summary>
/// Initializes a new instance of the <see cref="WriteDescriptorSet"/> structure.
/// </summary>
/// <param name="dstSet">The destination descriptor set to update.</param>
/// <param name="dstBinding">The descriptor binding within that set.</param>
/// <param name="dstArrayElement">The starting element in that array.</param>
/// <param name="descriptorCount">
/// The number of descriptors to update (the number of elements in <see cref="ImageInfo"/>,
/// <see cref="BufferInfo"/>, or <see cref="TexelBufferView"/>).
/// </param>
/// <param name="descriptorType">
/// Specifies the type of each descriptor in <see cref="ImageInfo"/>, <see
/// cref="BufferInfo"/>, or <see cref="TexelBufferView"/>, as described below. It must be the
/// same type as that specified in <see cref="DescriptorSetLayoutBinding"/> for <see
/// cref="DstSet"/> at <see cref="DstBinding"/>. The type of the descriptor also controls
/// which array the descriptors are taken from.
/// </param>
/// <param name="imageInfo">
/// An array of <see cref="DescriptorImageInfo"/> structures or is ignored.
/// </param>
/// <param name="bufferInfo">
/// An array of <see cref="DescriptorBufferInfo"/> structures or is ignored.
/// </param>
/// <param name="texelBufferView">An array of <see cref="BufferView"/> handles or is ignored.</param>
public WriteDescriptorSet(DescriptorSet dstSet, int dstBinding, int dstArrayElement, int descriptorCount,
DescriptorType descriptorType, DescriptorImageInfo[] imageInfo = null, DescriptorBufferInfo[] bufferInfo = null,
BufferView[] texelBufferView = null)
{
DstSet = dstSet;
DstBinding = dstBinding;
DstArrayElement = dstArrayElement;
DescriptorCount = descriptorCount;
DescriptorType = descriptorType;
ImageInfo = imageInfo;
BufferInfo = bufferInfo;
TexelBufferView = texelBufferView?.ToHandleArray();
}
/// <summary>
/// Initializes a new instance of the <see cref="CopyDescriptorSet"/> structure.
/// </summary>
/// <param name="srcSet">Source descriptor set.</param>
/// <param name="srcBinding">Source binding.</param>
/// <param name="srcArrayElement">Array element within the source binding to copy from.</param>
/// <param name="dstSet">Destination descriptor set.</param>
/// <param name="dstBinding">Destination binding.</param>
/// <param name="dstArrayElement">
/// Array element within the destination binding to copy to.
/// </param>
/// <param name="descriptorCount">
/// The number of descriptors to copy from the source to destination.
/// </param>
public CopyDescriptorSet(
DescriptorSet srcSet, int srcBinding, int srcArrayElement,
DescriptorSet dstSet, int dstBinding, int dstArrayElement,
int descriptorCount)
{
Type = StructureType.CopyDescriptorSet;
Next = IntPtr.Zero;
SrcSet = srcSet;
SrcBinding = srcBinding;
SrcArrayElement = srcArrayElement;
DstSet = dstSet;
DstBinding = dstBinding;
DstArrayElement = dstArrayElement;
DescriptorCount = descriptorCount;
}
internal static DescriptorSet[] Allocate(DescriptorPool parent, ref DescriptorSetAllocateInfo createInfo)
{
fixed(long *setLayoutsPtr = createInfo.SetLayouts)
{
createInfo.ToNative(out DescriptorSetAllocateInfo.Native nativeCreateInfo, parent, setLayoutsPtr);
int count = createInfo.SetLayouts?.Length ?? 0;
var descriptorSetsPtr = stackalloc long[count];
Result result = vkAllocateDescriptorSets(parent.Parent, &nativeCreateInfo, descriptorSetsPtr);
VulkanException.ThrowForInvalidResult(result);
var descriptorSets = new DescriptorSet[count];
for (int i = 0; i < count; i++)
{
descriptorSets[i] = new DescriptorSet(parent, descriptorSetsPtr[i]);
}
return(descriptorSets);
}
}
/// <summary>
/// Update the contents of a descriptor set object.
/// <para>
/// The operations described by <paramref name="descriptorWrites"/> are performed first,
/// followed by the operations described by <paramref name="descriptorCopies"/>. Within each
/// array, the operations are performed in the order they appear in the array.
/// </para>
/// <para>
/// Each element in the <paramref name="descriptorWrites"/> array describes an operation
/// updating the descriptor set using descriptors for resources specified in the structure.
/// </para>
/// <para>
/// Each element in the <paramref name="descriptorCopies"/> array is a structure describing an
/// operation copying descriptors between sets.
/// </para>
/// </summary>
/// <param name="descriptorWrites">The structures describing the descriptor sets to write to.</param>
/// <param name="descriptorCopies">The structures describing the descriptor sets to copy between.</param>
public void UpdateSets(WriteDescriptorSet[] descriptorWrites = null, CopyDescriptorSet[] descriptorCopies = null)
{
DescriptorSet.Update(this, descriptorWrites, descriptorCopies);
}
/// <summary>
/// Allocate one or more descriptor sets.
/// <para>
/// The pool must have enough free descriptor capacity remaining to allocate the descriptor
/// sets of the specified layouts.
/// </para>
/// <para>
/// When a descriptor set is allocated, the initial state is largely uninitialized and all
/// descriptors are undefined. However, the descriptor set can be bound in a command buffer
/// without causing errors or exceptions. All entries that are statically used by a pipeline
/// in a drawing or dispatching command must have been populated before the descriptor set is
/// bound for use by that command. Entries that are not statically used by a pipeline can
/// have uninitialized descriptors or descriptors of resources that have been destroyed, and
/// executing a draw or dispatch with such a descriptor set bound does not cause undefined
/// behavior. This means applications need not populate unused entries with dummy descriptors.
/// </para>
/// <para>
/// If an allocation fails due to fragmentation, an indeterminate error is returned with an
/// unspecified error code. Any returned error other than <see
/// cref="Result.ErrorFragmentedPool"/> does not imply its usual meaning: applications should
/// assume that the allocation failed due to fragmentation, and create a new descriptor pool.
/// </para>
/// </summary>
/// <param name="allocateInfo">The structure describing parameters of the allocation.</param>
public DescriptorSet[] AllocateSets(DescriptorSetAllocateInfo allocateInfo)
{
return(DescriptorSet.Allocate(this, ref allocateInfo));
}
/// <summary>
/// Free one or more descriptor sets.
/// </summary>
/// <param name="descriptorSets">An array of handles to <see cref="DescriptorSet"/> objects.</param>
/// <exception cref="VulkanException">Vulkan returns an error code.</exception>
public void FreeSets(params DescriptorSet[] descriptorSets)
{
DescriptorSet.Free(this, descriptorSets);
}
