Thread overview
combindings and directxbindings
Sep 06
Ethan
Sep 07
Dennis
Sep 07
Dennis
Sep 07
Ethan
September 06
https://github.com/GooberMan/combindings
https://github.com/GooberMan/directxbindings

I needed some DirectX 12 bindings. Autogeneration was out of the question. The .idl files Microsoft uses internally is full of plain C++ code that is inserted in to headers without additional parsing, and DirectX is basically useless without those #defines and function definitions. So in between compile times elsewhere, I hand converted the necessary headers to D modules.

Then me being me, I wanted to go one step further. Why should it just be a direct translation? Why not have some convenience methods added?

So now there's two libraries.

combindings - A thin layer that defines COM compatible UDAs and autogenerates some convenience features
directxbindings - Little more than direct hand-done translations of DirectX headers to D

These will be updated as I use them. And they're essentially mostly untested right now, I'm testing as I go.

They're also released under a Creative Commons 0 license. It seems to be the only really valid public domain license internationally; and these are COM bindings. There's no way I should be attributed on a random project just because you're using a very thin glue layer I wrote for something that should just plain exist as a D feature anyway (ie COM interface autogeneration).

COM Bindings aims for compatability first, and convenience second. The idea is that you should be able to copy/paste code from C++, replace the -> with . and off you go. That's not _entirely_ possible for one very good reason: the IID_PPV_ARGS macro. This expands to two symbols meant to be inserted in a function call in C++. If you want to do something similar in D, both templates and mixin templates are entirely unsuitable. You need to resort to string mixins. *UGLY* *UGLY* *UGLY* why even bother moving to D if you're going to be uglier than C++.

Next step then. We analyse function attributes. If we find a @_COM_Outptr_ or @_COM_Outptr_opt_ attribute in a function and the previous parameter is a REFIID, then sweet. We know what to do. For example, the following C++ code:

HRESULT result = D3D12CreateDevice(adapter, D3D_FEATURE_LEVEL_12_0, IID_PPV_ARGS(&device));

Can be translated to the following thanks to the wrapper stubs generated:

HRESULT result = D3D12CreateDevice(adapter, D3D_FEATURE_LEVEL_12_0, device);

And if you really really want, you can still just do a direct translation of equivalent C++ code:

HRESULT result = D3D12CreateDevice(adapter, D3D_FEATURE_LEVEL_12_0, &IID_IDirect3D12Device, cast(void**)&device);

Or try something that doesn't require linking to external variables:

HRESULT result = D3D12CreateDevice(adapter, D3D_FEATURE_LEVEL_12_0, device.IIDPtrOf, cast(void**)&device);

HRESULT result = D3D12CreateDevice(adapter, D3D_FEATURE_LEVEL_12_0, IIDPtrOf!IDirect3DDevice12, cast(void**)&device);

Likewise when you have functions where the output device is optional, you can just straight up template instantiate them:

HRESULT result = D3D12CreateDevice!IDirect3DDevice12(adapter, D3D_FEATURE_LEVEL_12_0 );
September 07
On Sunday, 6 September 2020 at 18:14:25 UTC, Ethan wrote:
> So now there's two libraries.
>
> combindings - A thin layer that defines COM compatible UDAs and autogenerates some convenience features
> directxbindings - Little more than direct hand-done translations of DirectX headers to D

Cool stuff! I'm using OpenGL instead of Direct3D so I don't have a use for these currently, but I'll keep them in mind in case that changes.

Have you considered publishing it to code.dlang.org? I noticed there's already
https://code.dlang.org/packages/aurora-directx and https://code.dlang.org/packages/directx-d , have you checked these out?
September 07
On Sunday, 6 September 2020 at 18:14:25 UTC, Ethan wrote:
> So now there's two libraries.
>
> combindings - A thin layer that defines COM compatible UDAs and autogenerates some convenience features
> directxbindings - Little more than direct hand-done translations of DirectX headers to D

Cool stuff! I'm using OpenGL instead of Direct3D so I don't have a use for these currently, but I'll keep them in mind in case that changes.

Have you considered publishing it to code.dlang.org? I noticed there's already
https://code.dlang.org/packages/aurora-directx and https://code.dlang.org/packages/directx-d, have you checked these out?
September 07
On Monday, 7 September 2020 at 19:35:41 UTC, Dennis wrote:
> Have you considered publishing it to code.dlang.org?

Not yet. Pretty busy at the moment, should probably wait for them to be actually designated usable before doing so.

> I noticed there's already
> https://code.dlang.org/packages/aurora-directx and https://code.dlang.org/packages/directx-d, have you checked these out?

Aurora DirectX does not convert a bunch of defines (specifically the macro expansions). DirectX-D does not preserve the COM attributes. Both are licensed in a way that will require attribution for source, and binaries for DirectX-D. Attribution for COM bindings? Nah. These *should* be autogenerated by a machine exclusively, but I haven't sat down to solve that particular problem yet thanks to the fact that you'll end up having to parse C headers every single time to get complete bindings.

One thing I forgot to mention about the glue layer in combindings - it will parse named enumeration types and provide aliases to each member in the package namespace. Again, this facilitates copy/paste code. There's absolutely nothing stopping anyone applying combindings to those two alternative libraries and taking advantage of this, in fact. Not having the UDAs means you won't get the convenience methods to make your code more D-like, but you can at least convert C/C++ enumeration manipulations simply by copy/pasting the code in to D.