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How to control stereo-frames separately with C#? - SOLVED
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One Eyed Hopeful
Joined: Mon May 09, 2011 2:41 am Posts: 2 
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I’m trying to make a very simple application which would display different images on each eye. I have Asus VG236H monitor and NVIDIA 3D Vision kit, the stereo 3D shutter glasses. The I’m using C#, .NET Framework 2.0, DirectX 9 (Managed Direct X) and Visual Studio 2008. I have been searching high and low for examples and tutorials, have actually found a couple and based those I have created the program but for some reason I can’t get it working.
When looking for examples how to display different images for each eye, many people keep referring to the NVIDIA presentation at GDC 09 (the famous GDC09-3DVision-The_In_and_Out.pdf document) and the pages 37-40. My code is mainly constructed based on that example: 1. I'm loading two textures (Red.png and Blue.png) on surface (_imageLeft and _imageRight), in function LoadSurfaces() 2. Set3D() function puts those two images side-by-side to one bigger image which has the size of 2x Screen width and Screen height + 1 (_imageBuf). 3. Set3D() function continues by appending the stereo signature on the last row. 4. OnPaint()-function takes the back buffer (_backBuf) and copies the content of the combined image (_imageBuf) to it. When I run the program, shutter glasses start working, but I only see the two images side-by-side on the screen. Could someone help out and tell me what am I doing wrong? I believe that solving this problem might also help others as there does not yet seem to be a simple example how to do this with C#. Here are the tactical parts of my code. Complete project as attachment. Attachment: NVStereoTest.rar Code: public void InitializeDevice() { PresentParameters presentParams = new PresentParameters(); presentParams.Windowed = false; presentParams.BackBufferFormat = Format.A8R8G8B8; presentParams.BackBufferWidth = _size.Width; presentParams.BackBufferHeight = _size.Height; presentParams.BackBufferCount = 1; presentParams.SwapEffect = SwapEffect.Discard; presentParams.PresentationInterval = PresentInterval.One; _device = new Device(0, DeviceType.Hardware, this, CreateFlags.SoftwareVertexProcessing, presentParams); } public void LoadSurfaces() { _imageBuf = _device.CreateOffscreenPlainSurface(_size.Width * 2, _size.Height + 1, Format.A8R8G8B8, Pool.Default); _imageLeft = Surface.FromBitmap(_device, (Bitmap)Bitmap.FromFile("Blue.png"), Pool.Default); _imageRight = Surface.FromBitmap(_device, (Bitmap)Bitmap.FromFile("Red.png"), Pool.Default); } private void Set3D() { Rectangle destRect = new Rectangle(0, 0, _size.Width, _size.Height); _device.StretchRectangle(_imageLeft, _size, _imageBuf, destRect, TextureFilter.None); destRect.X = _size.Width; _device.StretchRectangle(_imageRight, _size, _imageBuf, destRect, TextureFilter.None); GraphicsStream gStream = _imageBuf.LockRectangle(LockFlags.None); byte[] data = new byte[] {0x44, 0x33, 0x56, 0x4e, //NVSTEREO_IMAGE_SIGNATURE = 0x4433564e 0x00, 0x00, 0x0F, 0x00, //Screen width * 2 = 1920*2 = 3840 = 0x00000F00; 0x00, 0x00, 0x04, 0x38, //Screen height = 1080 = 0x00000438; 0x00, 0x00, 0x00, 0x20, //dwBPP = 32 = 0x00000020; 0x00, 0x00, 0x00, 0x02}; //dwFlags = SIH_SCALE_TO_FIT = 0x00000002; gStream.Seek(_size.Width * 2 * _size.Height * 4, System.IO.SeekOrigin.Begin); //last row gStream.Write(data, 0, data.Length); gStream.Close(); _imageBuf.UnlockRectangle(); } protected override void OnPaint(System.Windows.Forms.PaintEventArgs e) { _device.BeginScene(); // Get the Backbuffer then Stretch the Surface on it. _backBuf = _device.GetBackBuffer(0, 0, BackBufferType.Mono); _device.StretchRectangle(_imageBuf, new Rectangle(0, 0, _size.Width * 2, _size.Height + 1), _backBuf, new Rectangle(0, 0, _size.Width, _size.Height), TextureFilter.None); _backBuf.ReleaseGraphics(); _device.EndScene(); _device.Present(); this.Invalidate(); } You do not have the required permissions to view the files attached to this post. Last edited by Andows on Mon May 09, 2011 6:32 am, edited 1 time in total. |
| Mon May 09, 2011 4:00 am |
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One Eyed Hopeful
Joined: Mon May 09, 2011 2:41 am Posts: 2
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A friend of mine found the problem. The bytes in the stereo signature were in reversed order. Here is the correct order:
Code: byte[] data = new byte[] {0x4e, 0x56, 0x33, 0x44, //NVSTEREO_IMAGE_SIGNATURE = 0x4433564e; 0x00, 0x0F, 0x00, 0x00, //Screen width * 2 = 1920*2 = 3840 = 0x00000F00; 0x38, 0x04, 0x00, 0x00, //Screen height = 1080 = 0x00000438; 0x20, 0x00, 0x00, 0x00, //dwBPP = 32 = 0x00000020; 0x02, 0x00, 0x00, 0x00}; //dwFlags = SIH_SCALE_TO_FIT = 0x00000002; The code works perfectly after this change. This code might even serve as a good tutorial for someone else attempting the same thing.  |
| Mon May 09, 2011 6:28 am |
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3D Angel Eyes (Moderator)  Joined: Sat Apr 12, 2008 8:18 pm Posts: 10022
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Thanks for posting. This may prove useful for some members.
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| Mon May 09, 2011 5:58 pm |
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