Error Running jextract on d3d12.h

[Ty Young]

On 9/15/20 12:35 PM, Maurizio Cimadamore wrote:
> After throwing the kitchen sink at your example (I set up Windows on a 
> virtual instance to play with it), I was able to reproduce the issue.
>
> I discussed this with Jorn offline and Jorn pointed out at an issue 
> that I should have spotted much earlier (thanks!) - the issue is that 
> when looking at API docs like:
>
> https://docs.microsoft.com/en-us/windows/win32/api/d3d12/nf-d3d12-id3d12device-createcommandqueue 
>
>
> This is actually the description of the C++ API.
>
> The C API almost always takes some extra parameter - in the case of 
> this function, the first parameter must be a device pointer.


Which is where the first pointer argument came from when I suggested the 
FunctionDescriptor/MethodType to use. The C style interface copied in a 
previous email had:


HRESULT ( STDMETHODCALLTYPE *EnumAdapters )(
             IDXGIFactory * This,
             /* [in] */ UINT Adapter,
             /* [annotation][out] */
             _COM_Outptr_   IDXGIAdapter **ppAdapter);


I missed the return enum by accident, my bad.

FYI, the C style interface are not officially supported and have supposedly been removed from Windows 10's SDK somewhat recently:

https://github.com/microsoft/DirectX-Graphics-Samples/issues/589

Of course it doesn't mean it won't work or isn't worth doing, just pointing out that C isn't the intended language.