d3d12: Move d3d12 files to separate solution.

[vlj]

It simplify solution configurations.

[Bigpet]

somebody didn't resolve merge conflicts 😄

[vlj]

Fixed build.
Added a minidx12 directory containing minimal files set to build dx12 backend.

[Nekotekina]

What do you want to achieve creating stdafx_d3d12.h?

[vlj]

I configured the project to use a precompiled header, and on the other hand it may be useful to have a specific one for dx includes later.

[danilaml]

@vlj would that work on win 8.1 and older? It would still compile dx12 stuff there.

[vlj]

I think so. The headers and libraries files are provided in minidx12. And I use runtime loading for d3d12 and d3d11 libs.
The other libs are present on 7 and later (dxgi, d3dcompiler, dwrite and d2d)

[danilaml]

@vlj can someone not on win10 test it?

[vlj]

I can't, Nekoteki has still 7 on his dev pc though

[Nekotekina]

It doesn't build on win7. What shall I do, revert it?

[Zangetsu38]

@Nekotekina Why not upgrade to Windows 10?
Windows 7 has absolutely no interest.
It is completely and totally exceeds obsolete, no interest stayed on.

[danilaml]

@Zangetsu38 that's no the point. Maybe you even suggest drop linux?
This change was totally unnecessary and turns out brakes something that was working.

[Zangetsu38]

@danilaml Huh, it is the relation between the Linux and Windows?
And it works very well, both on windows 10, linux or Mac, then I ca not see why would walk on Windows 7, if you are on Windows 7 you choose not to build in DX12, so where is the problem?

[vlj]

@Nekotekina you can also provide the build log so that people can fix build

[Nekotekina]

>------ Skipped Build: Project: D3D12GSRender, Configuration: Release x64 ------
>Project not selected to build for this solution configuration 
........................
Error   LNK1181 cannot open input file 'blablablah\rpcs3\x64\Release\D3D12GSRender.lib'

[Nekotekina]

D3D12GSRender doesn't build because:

c:\program files (x86)\windows kits\8.1\include\um\d3d11shader.h(42): error C2011: '_D3D_PARAMETER_FLAGS': 'enum' type redefinition
note: see declaration of '_D3D_PARAMETER_FLAGS'

[vlj]

thanks

[Nekotekina]

I must apologize that I didn't provide the info immediately and merged my fix instead. But if it's possible to build dx12 code on any system after all, why keep those DX12 build configs?