ImGui DirectX11 Implementation

Silk.NET.sln

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 EndProject
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examples/CSharp/Direct3D11 Demos/ImGuiDX11Demo/ImGuiDX11Demo.csproj

@@ -0,0 +1,21 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net6.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+        <LangVersion>12</LangVersion>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="ImGui.NET" Version="1.91.6.1" />
+        <ProjectReference Include="..\..\..\..\src\Input\Silk.NET.Input\Silk.NET.Input.csproj" />
+        <ProjectReference Include="..\..\..\..\src\Microsoft\Silk.NET.Direct3D.Compilers\Silk.NET.Direct3D.Compilers.csproj" />
+        <ProjectReference Include="..\..\..\..\src\Microsoft\Silk.NET.Direct3D11\Silk.NET.Direct3D11.csproj" />
+        <ProjectReference Include="..\..\..\..\src\Windowing\Silk.NET.Windowing\Silk.NET.Windowing.csproj" />
+        <ProjectReference Include="..\..\..\..\src\Lab\Experiments\ImGuiDX11\ImGuiDX11.csproj" />
+    </ItemGroup>
+
+</Project>

examples/CSharp/Direct3D11 Demos/ImGuiDX11Demo/Program.cs

@@ -0,0 +1,196 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+/////////////////////////////////////////////////////// PLEASE READ! ///////////////////////////////////////////////////
+// This provides a basic example of using our Direct3D 11 bindings in their current form. These bindings are still    //
+// improving over time, and as a result the content of this example may change.                                       //
+// Notably:                                                                                                           //
+// TODO remove Unsafe.NullRef once we've updated the bindings to not require it                                       //
+// TODO investigate making the D3DPrimitiveTopology enum more user friendly                                           //
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+using System.Runtime.CompilerServices;
+using ImGuiNET;
+using Silk.NET.Core.Native;
+using Silk.NET.Direct3D11;
+using Silk.NET.DXGI;
+using Silk.NET.Input;
+using Silk.NET.Lab.Experiments.ImGuiDX11;
+using Silk.NET.Maths;
+using Silk.NET.Windowing;
+
+float[] backgroundColour = [0.0f, 0.0f, 0.0f, 1.0f];
+
+// Load the DXGI and Direct3D11 libraries for later use.
+// Given this is not tied to the window, this doesn't need to be done in the OnLoad event.
+DXGI dxgi = null!;
+D3D11 d3d11 = null!;
+
+// These variables are initialized within the Load event.
+ComPtr<IDXGIFactory2> factory = default;
+ComPtr<IDXGISwapChain1> swapchain = default;
+ComPtr<ID3D11Device> device = default;
+ComPtr<ID3D11DeviceContext> deviceContext = default;
+
+ImGuiDX11Controller controller = null;
+
+// Create a window.
+WindowOptions options = WindowOptions.Default with
+{
+    Size = new Vector2D<int>(800, 600),
+    Title = "Learn Direct3D11 with Silk.NET",
+    API = GraphicsAPI.None, // <-- This bit is important, as your window will be configured for OpenGL by default.
+};
+var window = Window.Create(options);
+
+// Assign events.
+window.Load += OnLoad;
+window.Render += OnRender;
+window.FramebufferResize += OnFramebufferResize;
+
+// Run the window.
+window.Run();
+
+// Dispose of the ImGui context.
+controller?.Dispose();
+
+// Clean up any resources.
+factory.Dispose();
+swapchain.Dispose();
+device.Dispose();
+deviceContext.Dispose();
+d3d11.Dispose();
+dxgi.Dispose();
+
+//dispose the window, and its internal resources
+window.Dispose();
+
+
+unsafe void OnLoad()
+{
+    //Whether or not to force use of DXVK on platforms where native DirectX implementations are available
+    const bool forceDxvk = false;
+
+    dxgi = DXGI.GetApi(window, forceDxvk);
+    d3d11 = D3D11.GetApi(window, forceDxvk);
+
+    // Set-up input context.
+    var input = window.CreateInput();
+    foreach (var keyboard in input.Keyboards)
+    {
+        keyboard.KeyDown += OnKeyDown;
+    }
+
+    // Create our D3D11 logical device.
+    SilkMarshal.ThrowHResult
+    (
+        d3d11.CreateDevice
+        (
+            default(ComPtr<IDXGIAdapter>),
+            D3DDriverType.Hardware,
+            Software: default,
+            (uint) CreateDeviceFlag.Debug,
+            null,
+            0,
+            D3D11.SdkVersion,
+            ref device,
+            null,
+            ref deviceContext
+        )
+    );
+
+    //This is not supported under DXVK 
+    //TODO: PR a stub into DXVK for this maybe?
+    if (OperatingSystem.IsWindows())
+    {
+        // Log debug messages for this device (given that we've enabled the debug flag). Don't do this in release code!
+        device.SetInfoQueueCallback(msg => Console.WriteLine(SilkMarshal.PtrToString((nint) msg.PDescription)));
+    }
+
+    // Create our swapchain.
+    var swapChainDesc = new SwapChainDesc1
+    {
+        BufferCount = 2, // double buffered
+        Format = Format.FormatB8G8R8A8Unorm,
+        BufferUsage = DXGI.UsageRenderTargetOutput,
+        SwapEffect = SwapEffect.FlipDiscard,
+        SampleDesc = new SampleDesc(1, 0)
+    };
+
+    // Create our DXGI factory to allow us to create a swapchain. 
+    factory = dxgi.CreateDXGIFactory<IDXGIFactory2>();
+
+    // Create the swapchain.
+    SilkMarshal.ThrowHResult
+    (
+        factory.CreateSwapChainForHwnd
+        (
+            device,
+            window.Native!.DXHandle!.Value,
+            in swapChainDesc,
+            null,
+            ref Unsafe.NullRef<IDXGIOutput>(),
+            ref swapchain
+        )
+    );
+
+    // Init ImGui.
+    // This is where you can set a custom font for ImGui.
+    //ImGuiFontConfig fontConfig = new ImGuiFontConfig("C:\\Windows\\Fonts\\arial.ttf", 16, ptr => ptr.Fonts.GetGlyphRangesDefault());
+    controller = new ImGuiDX11Controller(device, deviceContext, window, input/*, fontConfig*/);
+}
+
+void OnFramebufferResize(Vector2D<int> newSize)
+{
+    // If the window resizes, we need to be sure to update the swapchain's back buffers.
+    // Good starting point for this function:
+    // https://learn.microsoft.com/en-us/windows/win32/direct3ddxgi/d3d10-graphics-programming-guide-dxgi#handling-window-resizing
+    SilkMarshal.ThrowHResult
+    (
+        swapchain.ResizeBuffers(0, (uint) newSize.X, (uint) newSize.Y, Format.FormatB8G8R8A8Unorm, 0)
+    );
+}
+
+unsafe void OnRender(double deltaSeconds)
+{
+    // Update the ImGui controller.
+    controller.Update((float)deltaSeconds);
+
+    // Obtain the framebuffer for the swapchain's backbuffer.
+    using ComPtr<ID3D11Texture2D> framebuffer = swapchain.GetBuffer<ID3D11Texture2D>(0);
+
+    // Create a view over the render target.
+    ComPtr<ID3D11RenderTargetView> renderTargetView = default;
+    SilkMarshal.ThrowHResult(device.CreateRenderTargetView(framebuffer, null, ref renderTargetView));
+
+    // Clear the render target to be all black ahead of rendering.
+    deviceContext.ClearRenderTargetView(renderTargetView, ref backgroundColour[0]);
+
+    // Update the rasterizer state with the current viewport.
+    Viewport viewport = new Viewport(0, 0, window.FramebufferSize.X, window.FramebufferSize.Y, 0, 1);
+    deviceContext.RSSetViewports(1, in viewport);
+
+    // Tell the output merger about our render target view.
+    deviceContext.OMSetRenderTargets(1, ref renderTargetView, ref Unsafe.NullRef<ID3D11DepthStencilView>());
+
+    // Show everything you want before calling ImGui.Render().
+    ImGui.ShowDemoWindow();
+
+    // Then render ImGui.
+    controller.Render();
+
+    // Present the drawn image.
+    swapchain.Present(1, 0);
+
+    // Clean up any resources created in this method.
+    renderTargetView.Dispose();
+}
+
+void OnKeyDown(IKeyboard keyboard, Key key, int scancode)
+{
+    // Check to close the window on escape.
+    if (key == Key.Escape)
+    {
+        window.Close();
+    }
+}

src/Lab/Experiments/ImGuiDX11/ImGuiDX11.csproj

@@ -0,0 +1,22 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFrameworks>net5.0;net6.0</TargetFrameworks>
+        <Nullable>enable</Nullable>
+        <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+        <LangVersion>12</LangVersion>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\..\..\Core\Silk.NET.Core\Silk.NET.Core.csproj" />
+        <ProjectReference Include="..\..\..\Maths\Silk.NET.Maths\Silk.NET.Maths.csproj" />
+        <ProjectReference Include="..\..\..\Microsoft\Silk.NET.Direct3D11\Silk.NET.Direct3D11.csproj" />
+        <ProjectReference Include="..\..\..\Microsoft\Silk.NET.Direct3D.Compilers\Silk.NET.Direct3D.Compilers.csproj" />
+        <ProjectReference Include="..\..\..\Microsoft\Silk.NET.DXGI\Silk.NET.DXGI.csproj" />
+        <ProjectReference Include="..\..\..\Input\Silk.NET.Input\Silk.NET.Input.csproj" />
+        <ProjectReference Include="..\..\..\Windowing\Silk.NET.Windowing.Common\Silk.NET.Windowing.Common.csproj" />
+        <PackageReference Include="ImGui.NET" Version="1.90.8.1" />
+    </ItemGroup>
+
+    <Import Project="..\..\..\..\build\props\common.props" />
+</Project>