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How to render into DirectX context using Vulkan
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jack-day/vulkan-interop-directx
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This repo demonstrates interop between Vulkan and DirectX via embedding the former into WinUI 3 and WPF usingVK_KHR_external_memory_win32 extension. It's basically follows greatAlexander Overvoorde's tutorial for creating resources, but excludes swapchain infrastructure and creates a framebuffer using a shared Direct3D 11 texture.
Whether you are using your own or third party abstractions - it should be easy to adapt the code for use.
The example is written naively, step by step - seeVulkanInterop.Initialize andWindow code behind.
Silk.NET - bindings used for DirectX and Vulkan calls.
Damaged Helmet - model used as an example.SharpGLTF - loader used to read the model.
vulkan-interop-directx.mp4
We need to
In case of WinUI - create a DXGI swapchain, get the texture and set the swapchain to the WinUI SwapChainPanel.
varswapchainDescription=newSwapChainDesc1{ ...Width=width,Height=height,Format=Format.FormatR8G8B8A8Unorm,SwapEffect=SwapEffect.FlipSequential,SampleDesc=newSampleDesc(1u,0u),BufferUsage=DXGI.UsageBackBuffer};ThrowHResult(dxgiFactory.CreateSwapChainForComposition(dxgiDevice,swapchainDescription,default(ComPtr<IDXGIOutput>),refswapchain));backbufferTexture=swapchain.GetBuffer<ID3D11Texture2D>(0u);target.As<ISwapChainPanelNative>().SetSwapChain(swapchain);
In case of WPF - create a D3D9 texture and get the surface that will be used with WPF D3DImage.
void*d3d9shared=null;ThrowHResult(d3d9device.CreateTexture(width,height,1u,D3D9.UsageRendertarget,Silk.NET.Direct3D9.Format.X8R8G8B8,Pool.Default,refbackbufferTexture,refd3d9shared));ThrowHResult(backbufferTexture.GetSurfaceLevel(0u,refsurface));
In case of WinUI - this is regular D3D11 texture.
varrenderTargetDescription=newTexture2DDesc{ ...Width=width,Height=height,BindFlags=(uint)BindFlag.RenderTarget,MiscFlags=(uint)ResourceMiscFlag.Shared};ThrowHResult(d3d11device.CreateTexture2D(renderTargetDescription,null,refrenderTargetTexture));
With WinUI we also need to query both back buffer and render target textures to D3D11 resources for future copy operations.
backbufferResource=backbufferTexture.QueryInterface<ID3D11Resource>();renderTargetResource=renderTargetTexture.QueryInterface<ID3D11Resource>();
In case of WPF, we get the texture using shared handle of the D3D9 texture we created earlier.
renderTargetTexture=d3d11device.OpenSharedResource<ID3D11Texture2D>(d3d9shared);
void*handle;varresource=renderTargetTexture.QueryInterface<IDXGIResource>();ThrowHResult(resource.GetSharedHandle(&handle));resource.Dispose();renderTargetSharedHandle=(nint)handle;
Then create the view and framebuffer - seeVulkanInterop.CreateImageViews.
varexternalMemoryImageInfo=newExternalMemoryImageCreateInfo(handleTypes:ExternalMemoryHandleTypeFlags.D3D11TextureKmtBit);varimageInfo=newImageCreateInfo( ...format: targetFormat,usage:ImageUsageFlags.ColorAttachmentBit,pNext:&externalMemoryImageInfo);varimportMemoryInfo=newImportMemoryWin32HandleInfoKHR(handleType:ExternalMemoryHandleTypeFlags.D3D11TextureKmtBit,handle:renderTargetSharedHandle);vk.CreateImage(device,imageInfo,null,outdirectImage).Check();
Note that D3D9
X8R8G8B8texture format map to VulkanB8G8R8A8Unorm
With WinUI we need to call Direct3D 11 to copy data from the render target to the back buffer and present it.
// *rendering*d3d11context.CopyResource(backbufferResource,renderTargetResource);ThrowHResult(swapchain.Present(0u,(uint)SwapChainFlag.None));
With WPF we only need to set the D3D9 surface to the D3DImage, because the back buffer already contains the rendered image.
d3dImage.Lock();// *rendering*d3dImage.SetBackBuffer(D3DResourceType.IDirect3DSurface9,(nint)d3d9surface.Handle);d3dImage.AddDirtyRect(newInt32Rect(0,0,d3dImage.PixelWidth,d3dImage.PixelHeight));d3dImage.Unlock();
- .NET 8
- Windows SDK 10.0.22621
The example isdotnet build ready.