84 lines
3.3 KiB
C#
84 lines
3.3 KiB
C#
using System;
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using System.Runtime.InteropServices;
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using Windows.Graphics.DirectX.Direct3D11;
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using WinRT;
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namespace ytLive.Services;
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/// <summary>
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/// Bridges a native D3D11 device into the WinRT <see cref="IDirect3DDevice"/>
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/// the capture API needs. CsWinRT doesn't project the Direct3D11Helper static,
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/// so this creates the device with D3D11CreateDevice and converts it via the
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/// WinRT interop export <c>CreateDirect3D11DeviceFromDXGIDevice</c> (d3d11.dll).
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///
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/// This deliberately does NOT use the older QI-for-IDirect3DDxgiInterfaceAccess
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/// trick: the raw D3D11 device stopped exposing that interface on newer Windows
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/// (verified E_NOINTERFACE on build 26200, hardware and WARP alike), while
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/// CreateDirect3D11DeviceFromDXGIDevice keeps working. One shared device per
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/// process.
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/// </summary>
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internal static class Direct3D11Helper
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{
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private const uint D3D11CreateDeviceBgraSupport = 0x20;
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private const uint D3D11SdkVersion = 7;
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private const int DriverTypeHardware = 1;
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// IDirect3DDxgiInterfaceAccess (the legacy bridge) is only exposed on an
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// 11.1 device AND requires the 11.1 runtime to be in the requested set —
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// with pFeatureLevels = NULL D3D11CreateDevice never creates 11.1, so the
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// array must be explicit (11.1 first, then descending).
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private static readonly int[] FeatureLevels = { 0xB100, 0xB000, 0xA100, 0xA000, 0x9300, 0x9200, 0x9100 };
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private static IDirect3DDevice? _sharedDevice;
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private static readonly object Gate = new();
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public static IDirect3DDevice CreateDevice()
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{
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if (_sharedDevice != null) return _sharedDevice;
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lock (Gate)
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{
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return _sharedDevice ??= CreateDeviceCore();
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}
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}
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private static IDirect3DDevice CreateDeviceCore()
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{
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var hr = D3D11CreateDevice(IntPtr.Zero, DriverTypeHardware, IntPtr.Zero, D3D11CreateDeviceBgraSupport,
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FeatureLevels, (uint)FeatureLevels.Length, D3D11SdkVersion, out var devicePtr, out _, out var contextPtr);
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if (hr != 0)
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throw Marshal.GetExceptionForHR(hr)!;
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try
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{
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var dxgiGuid = new Guid("54EC77FA-1377-44E6-8C32-88FD5F44C84C");
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var qiHr = Marshal.QueryInterface(devicePtr, ref dxgiGuid, out var dxgiDevice);
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if (qiHr != 0)
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throw Marshal.GetExceptionForHR(qiHr)!;
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try
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{
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hr = CreateDirect3D11DeviceFromDXGIDevice(dxgiDevice, out var winrtDevice);
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if (hr != 0)
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throw Marshal.GetExceptionForHR(hr)!;
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return MarshalInterface<IDirect3DDevice>.FromAbi(winrtDevice);
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}
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finally
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{
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Marshal.Release(dxgiDevice);
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}
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}
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finally
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{
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Marshal.Release(devicePtr);
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Marshal.Release(contextPtr);
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}
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}
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[DllImport("d3d11.dll")]
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private static extern int D3D11CreateDevice(IntPtr pAdapter, int driverType, IntPtr software,
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uint flags, int[]? featureLevels, uint featureLevelsCount, uint sdkVersion,
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out IntPtr device, out int featureLevel, out IntPtr immediateContext);
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[DllImport("d3d11.dll", ExactSpelling = true)]
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private static extern int CreateDirect3D11DeviceFromDXGIDevice(IntPtr dxgiDevice, out IntPtr graphicsDevice);
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}
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