Feature/vulkan struct chaining/2 unmanaged chains

Silk.NET.sln

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documentation/proposals/Proposal - Vulkan Struct Chaining - #1 StructureType correction.md

@@ -0,0 +1,92 @@
+# Summary
+
+This proposal is a minimal enhancement to [`Silk.Net.Vulkan`](../../src/Vulkan/Silk.NET.Vulkan) to mark all structures
+that contain a `StructureType SType` field as implementing the interface `IStructuredType`.
+
+This is a tiny pre-requisite for
+[Proposal - Vulkan Struct Chaining - #2 Unmanaged Chaining.md](Proposal%20-%20Vulkan%20Struct%20Chaining%20-%20%232%20Unmanaged%20Chaining.md)
+and is of limited value otherwise. Its primary purpose is to mark any structure that requires it's `SType` field to be
+correctly set when passing to Vulkan, and to provide a mechanism for doing so.
+
+A full implementation can be found [in Pull Request 680](https://github.com/dotnet/Silk.NET/pull/680).
+
+# Contributors
+
+- [Craig Dean, DevDecoder](https://github.com/thargy)
+
+# Current Status
+
+- [x] Proposed
+- [ ] Discussed with API Review Board (ARB)
+- [ ] Approved
+- [x] Implemented
+
+# Design Decisions
+
+- The `IStructuredType` interface will usually not be implemented directly, instead `IChainable` (from
+  the [unmanaged chaining proposal](Proposal%20-%20Vulkan%20Struct%20Chaining%20-%20%232%20Unmanaged%20Chaining.md))
+  will extend this interface.
+- Whenever the `IStructuredType` is added to an interface (either directly or indirectly) the
+  corresponding `StructureType()` method should also be explicitly
+  implemented ([see below](#istructuretype-implementation)).
+- This proposed interface could easily be combined/merged with the `IChainable`
+  interface which [is proposed](Proposal%20-%20Vulkan%20Struct%20Chaining%20-%20%232%20Unmanaged%20Chaining.md) as an
+  extension. However, that interface marks a struct as having a second field `void* PNext`, as well as requiring
+  that `StructureType sType` field is in the first position, which is not required by this proposal (but is allowed).
+  Keeping the two concepts separate is good encapsulation and good for supporting future changes. The concept
+  that an `SType` must be correct is somewhat different to the concept of a chain (implied by `void* PNext`).
+- To be clear, this proposal does not need to guarantee that the `SType` field is in position 0 (i.e. first),
+  that requirement is only necessary to implement the functionality
+  [proposed by the unmanaged chaining system](Proposal%20-%20Vulkan%20Struct%20Chaining%20-%20%232%20Unmanaged%20Chaining.md)
+- Not all structures exposed by Vulkan have a default value for the `SType`, (e.g. `BaseOutStructure` and `BaseInStructure`),
+  where no default is available, the `StructureType()` method only returns the current value, rather than setting it.
+
+# Implementation Notes
+
+- BuildTools already contains enough information to determine whether the interface should be added to a structure, and
+  already knows which `StructureType` the structure should use.
+- A working example of such a struct can
+  be [found in the labs.](../../src/Lab/Experiments/PrototypeStructChaining/PrototypeStructChaining/PhysicalDeviceFeatures2.cs)
+
+# Proposed API
+
+## StructureType structures
+
+### IStructuredType
+
+This proposal adds a single interface `IStructuredType`, the primary purpose of which is to mark any structure that
+requires it's `SType` to be correctly set when passing to Vulkan. It adds a single
+method `void IStructuredType.StructureType()`
+which sets the `SType` correctly and returns it to the caller.
+
+```csharp
+namespace Silk.Net.Vulkan;
+
+/// <summary>
+/// Base interface for any struct that has a <see cref="StructureType"/> field called `SType`, that must be correctly
+/// set when passing into the Vulkan API.
+/// </summary>
+public interface IStructuredType
+{
+    /// <summary>
+    /// Gets the structured type's <see cref="Vulkan.StructureType"/> enum value.
+    /// </summary>
+    /// <remarks>
+    /// Retrieving the <see cref="Vulkan.StructureType"/> also ensures it is set to the correct value (if any).
+    /// </remarks>
+    StructureType StructureType();
+}
+```
+
+### IStructureType implementation
+
+Each struct generated that implements `IStructuredType` should also have the following code auto-generated, to
+explicitly implement the interface. The method sets and returns the `SType` correctly (if any) for the current structure.
+
+```csharp
+/// <inheritdoc />
+StructureType IStructuredType.StructureType()
+{
+    return SType = StructureType.<INSERT CORRECT TYPE HERE>;
+}
+```