RFC: VK_EXTERNAL_MEMORY_WIN32 extension patch

[Derek Lesho]

I just realized that I forgot the attach the patch itself!  My bad!


On Sun, Jul 28, 2019 at 9:06 PM Derek Lesho <dereklesho52 at gmail.com> wrote:
>
> Hello, before I break this patch up and submit a patchset, I'd like to inquire about a few things in this patch I have made.
>
> The biggest question I have is how we want to process allocate_info without modifying what is passed in.
>
> In order to copy the whole pNext chain or the unknown bits, we'd need a way to get the struct length given the sType.  To do this we'd have to generate something in make_vulkan, but I'm not sure of the specifics (mostly where the helper would go).
>
> Alternatively, we could try restoring the chain after it is finished, however this may not be thread safe, if the struct is being read in another thread.
>
> Additionally, I'd like to know how to better organize the functions for creating/operating on gpu-resource objects.  Right now they're in ntdll's misc.c, so that I can use some ntdll internal functions, but maybe we should have a separate file for this.
>
> If any of you want to play around with this patch, Joshua Ashton (d9vk creator) made a few patches on DXVK that implement D3D shared resources using this extension and files, and  modified a D3D example to use shared resources, which is what I've been using to test my implementation:
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> https://github.com/Joshua-Ashton/dxvk/tree/dxvk-shared-resources
>
> D3D11 binary attached (Joshua didn't send me source)
>
> Note: Make sure to reset to HEAD~1 then build, as I think the latest commit is broken.  Also, replace VK_EXTERNAL_MEMORY_HANDLE_TYPE_D3D11_TEXTURE_(+KMT_)BIT with VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_WIN32_(+KMT_)BIT.  Also, this branch only compiles with MSVC.  Alternatively, I'll attach the binaries to this email.
>
> Note 2: Make sure to use native d3dcompiler_47
>
>  Shared-Resources.tar.xz
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