ID3D12GraphicsCommandList4 bindings

[DethRaid]

I'd love to use DirectX 12's render passes in my renderer, but I need bindings for ID3D12GraphicsCommandList4, and those seem to be missing from winapi-rs. What's the best way for me to add them? Should I hand-code them, or do you have a way to auto-generate the Rust bindings from the C++ headers?

[retep998]

For headers which are automatically generated from a .idl file, https://github.com/Arnavion/winapi-tlb-bindgen is used to generate bindings which are then cleaned up by hand. For everything else, it's pretty much by hand.

[DethRaid]

Looks like there's a .idl file for d3d12, so that library should save me some time... but I can't seem to generate a .tlb from it. I'm invoking midl.exe like midl.exe d3d12.idl /tlb ./d3d12.tlb. I've double-checked that d3d12.idl is in the directory I'm calling midl.exe from. However, I don't end up with a .tlb file - Instead, I have .h, _i.c, and _p.c. I tried with the developer command prompts for both VS 2017 and 2019. Do you know how can I generate a .tlb file for d3d12.iml? Alternately, do you know how I can check if there's something in d3d12.iml that prevents generating a .tlb?

[retep998]

@Arnavion would be better suited to answer your questions.

[Arnavion]

https://social.msdn.microsoft.com/Forums/windowsdesktop/en-US/54db38e7-b64e-4c64-8b86-57d6fc39d718/midl-doesnt-create-a-tlb-file

https://docs.microsoft.com/en-us/windows/win32/midl/library

You'll need to modify the .idl to add a library wrapper around the exports you want in the .tlb

[Arnavion]

FWIW, WindowsBunny had asked me for this header some time ago, so here you go: https://gist.github.com/Arnavion/990b26ef8d3f15a267ea9807e1183e00

Note that midl.exe generates a MIDL2413 along with the .tlb. Specifically the output does not contain a valid definition of D3D12_RAYTRACING_INSTANCE_DESC, because the original struct contains bitfields and midl.exe does not support generating .tlb for those.

I don't remember if anything else was broken in it. Use with caution.

[DethRaid]

Ooh thanks, that's a big help! I can fix up that file, then PR it in