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| 1 | +using OVRSharp.Exceptions; |
| 2 | +using SharpDX; |
| 3 | +using SharpDX.Direct3D11; |
| 4 | +using System; |
| 5 | +using System.Drawing; |
| 6 | +using System.Drawing.Imaging; |
| 7 | +using Valve.VR; |
| 8 | + |
| 9 | +namespace OVRSharp.Graphics.DirectX |
| 10 | +{ |
| 11 | + public class DirectXCompositor : ICompositorAPI |
| 12 | + { |
| 13 | + private readonly Device device; |
| 14 | + |
| 15 | + public DirectXCompositor() |
| 16 | + { |
| 17 | + device = new Device(SharpDX.Direct3D.DriverType.Hardware, DeviceCreationFlags.Debug); |
| 18 | + } |
| 19 | + |
| 20 | + public Bitmap GetMirrorImage(EVREye eye = EVREye.Eye_Left) |
| 21 | + { |
| 22 | + var srvPtr = IntPtr.Zero; |
| 23 | + |
| 24 | + var result = OpenVR.Compositor.GetMirrorTextureD3D11(eye, device.NativePointer, ref srvPtr); |
| 25 | + if (result != EVRCompositorError.None) |
| 26 | + throw new OpenVRSystemException<EVRCompositorError>("Failed to get mirror texture from OpenVR", result); |
| 27 | + |
| 28 | + var srv = new ShaderResourceView(srvPtr); |
| 29 | + var tex = srv.Resource.QueryInterface<Texture2D>(); |
| 30 | + var texDesc = tex.Description; |
| 31 | + |
| 32 | + var bitmap = new Bitmap(texDesc.Width, texDesc.Height); |
| 33 | + var boundsRect = new Rectangle(0, 0, texDesc.Width, texDesc.Height); |
| 34 | + |
| 35 | + // Copy texture to CPU so we can read from it |
| 36 | + var cpuTex = new Texture2D(device, new Texture2DDescription |
| 37 | + { |
| 38 | + CpuAccessFlags = CpuAccessFlags.Read, |
| 39 | + BindFlags = BindFlags.None, |
| 40 | + Format = texDesc.Format, |
| 41 | + Width = texDesc.Width, |
| 42 | + Height = texDesc.Height, |
| 43 | + OptionFlags = ResourceOptionFlags.None, |
| 44 | + MipLevels = 1, |
| 45 | + ArraySize = 1, |
| 46 | + SampleDescription = { Count = 1, Quality = 0 }, |
| 47 | + Usage = ResourceUsage.Staging |
| 48 | + }); |
| 49 | + |
| 50 | + device.ImmediateContext.CopyResource(tex, cpuTex); |
| 51 | + OpenVR.Compositor.ReleaseMirrorTextureD3D11(srvPtr); |
| 52 | + |
| 53 | + var mapSource = device.ImmediateContext.MapSubresource(cpuTex, 0, MapMode.Read, SharpDX.Direct3D11.MapFlags.None); |
| 54 | + var mapDest = bitmap.LockBits(boundsRect, ImageLockMode.WriteOnly, bitmap.PixelFormat); |
| 55 | + var sourcePtr = mapSource.DataPointer; |
| 56 | + var destPtr = mapDest.Scan0; |
| 57 | + |
| 58 | + for (int y = 0; y < texDesc.Height; y++) |
| 59 | + { |
| 60 | + Utilities.CopyMemory(destPtr, sourcePtr, texDesc.Width * 4); |
| 61 | + sourcePtr = IntPtr.Add(sourcePtr, mapSource.RowPitch); |
| 62 | + destPtr = IntPtr.Add(destPtr, mapDest.Stride); |
| 63 | + } |
| 64 | + |
| 65 | + bitmap.UnlockBits(mapDest); |
| 66 | + device.ImmediateContext.UnmapSubresource(cpuTex, 0); |
| 67 | + cpuTex.Dispose(); |
| 68 | + |
| 69 | + FlipChannels(ref bitmap); |
| 70 | + return bitmap; |
| 71 | + } |
| 72 | + |
| 73 | + private static void FlipChannels(ref Bitmap bitmap) |
| 74 | + { |
| 75 | + var bytesPerPixel = Image.GetPixelFormatSize(bitmap.PixelFormat) / 8; |
| 76 | + var data = bitmap.LockBits( |
| 77 | + new Rectangle(0, 0, bitmap.Width, bitmap.Height), |
| 78 | + ImageLockMode.ReadWrite, |
| 79 | + bitmap.PixelFormat |
| 80 | + ); |
| 81 | + |
| 82 | + var length = System.Math.Abs(data.Stride) * bitmap.Height; |
| 83 | + |
| 84 | + unsafe |
| 85 | + { |
| 86 | + byte* rgbValues = (byte*)data.Scan0.ToPointer(); |
| 87 | + for (int i = 0; i < length; i += bytesPerPixel) |
| 88 | + { |
| 89 | + byte dummy = rgbValues[i]; |
| 90 | + rgbValues[i] = rgbValues[i + 2]; |
| 91 | + rgbValues[i + 2] = dummy; |
| 92 | + } |
| 93 | + } |
| 94 | + |
| 95 | + bitmap.UnlockBits(data); |
| 96 | + } |
| 97 | + } |
| 98 | +} |
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