Any good simple DirectX samples for Windows 8 (Developer preview)?

Are there any good tutorials on how to draw a simple triangle in DirecX for Windows 8 Developer preview? The game sample is too complex to understand the "basic" workings of the new DirectX version (which seems to be complete开发者_开发问答ly different from DirectX 9).

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The point of the sample is the Windows 8, not the DirectX. You need to learn DirectX11 before doing it with Windows 8. You're trying to read a sample on interoperation between two technologies, neither of which you understand. The point of Windows 8 Dev Preview is not to teach DirectX.

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Figured it out. See code below. Only thing that doesn't work is the texture (it shows as white instead of displaying the image, but at least it displays the triangle!) (This code isn't obviously the whole program. Turns out it involves quite a lot of complex code to just draw a triangle these days!)

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ManagedDirectX;
using Windows.Storage;
using Windows.Storage.Streams;
namespace TestProgram
{
    public sealed class EntryPoint
    {
        public void NtfyExecutionAbrt()
        {
        }

        public EntryPoint()
        {
            beginexecblock();
        }
        void onrenderframe()
        {
            if(vertcount>0) {
                maincontext.Draw(vertcount);
            }
        }
        int vertcount = 0;
        Shader defaultshader;
        RenderContext maincontext;
        async void beginexecblock()
        {
            if ((await Windows.Storage.ApplicationData.Current.RoamingFolder.GetFilesAsync()).Count == 0)
            {
                await ApplicationData.Current.RoamingFolder.CreateFileAsync("testfile.txt");
                ApplicationData.Current.SignalDataChanged();
                Windows.UI.Popups.MessageDialog tdlg = new Windows.UI.Popups.MessageDialog("Roaming file creation success", "Sync status");
                await tdlg.ShowAsync();    
            }
            try
            {
                DateTime started = DateTime.Now;
                RenderContext mtext = new RenderContext();
                maincontext = mtext;
                StorageFolder folder = Windows.ApplicationModel.Package.Current.InstalledLocation;
                StorageFile file = await folder.GetFileAsync("DXInteropLib\\VertexShader.cso");

                var stream = (await file.OpenAsync(FileAccessMode.Read));
                Windows.Storage.Streams.DataReader mreader = new Windows.Storage.Streams.DataReader(stream.GetInputStreamAt(0));
                byte[] dgram = new byte[file.Size];
                await mreader.LoadAsync((uint)dgram.Length);
                mreader.ReadBytes(dgram);
                file = await folder.GetFileAsync("DXInteropLib\\PixelShader.cso");

                stream = await file.OpenAsync(FileAccessMode.Read);
                mreader = new Windows.Storage.Streams.DataReader(stream.GetInputStreamAt(0));
                byte[] mgram = new byte[file.Size];
                await mreader.LoadAsync((uint)file.Size);
                mreader.ReadBytes(mgram);
                try
                {
                    defaultshader = mtext.CreateShader(dgram, mgram);
                    mtext.InitializeLayout(dgram);
                    defaultshader.Apply();
                    mtext.OnRenderFrame += onrenderframe;
                }
                catch (Exception er)
                {
                    Windows.UI.Popups.MessageDialog mdlg = new Windows.UI.Popups.MessageDialog(er.ToString(),"Fatal error");
                    mdlg.ShowAsync().Start();
                }
                IStorageFile[] files = (await folder.GetFilesAsync()).ToArray();
                bool founddata = false;
                foreach (IStorageFile et in files)
                {
                    if (et.FileName.Contains("rawimage.dat"))
                    {
                        stream = await et.OpenAsync(FileAccessMode.Read);
                        founddata = true;
                    }
                }
                int width;
                int height;
                byte[] rawdata;
                if (!founddata)
                {
                    file = await folder.GetFileAsync("TestProgram\\test.png");
                    stream = await file.OpenAsync(FileAccessMode.Read);
                    var decoder = await Windows.Graphics.Imaging.BitmapDecoder.CreateAsync(stream);
                    var pixeldata = await decoder.GetPixelDataAsync(Windows.Graphics.Imaging.BitmapPixelFormat.Rgba8, Windows.Graphics.Imaging.BitmapAlphaMode.Straight, new Windows.Graphics.Imaging.BitmapTransform(), Windows.Graphics.Imaging.ExifOrientationMode.IgnoreExifOrientation, Windows.Graphics.Imaging.ColorManagementMode.DoNotColorManage);
                    width = (int)decoder.PixelWidth;
                    height = (int)decoder.PixelHeight;

                    rawdata = pixeldata.DetachPixelData();
                    file = await folder.CreateFileAsync("rawimage.dat");
                    stream = (await file.OpenAsync(FileAccessMode.ReadWrite));
                    var realstream = stream.GetOutputStreamAt(0);
                    DataWriter mwriter = new DataWriter(realstream);
                    mwriter.WriteInt32(width);
                    mwriter.WriteInt32(height);
                    mwriter.WriteBytes(rawdata);
                    await mwriter.StoreAsync();
                    await realstream.FlushAsync();
                }
                else
                {
                    DataReader treader = new DataReader(stream.GetInputStreamAt(0));
                    await treader.LoadAsync((uint)stream.Size);
                    rawdata = new byte[stream.Size-(sizeof(int)*2)];
                    width = treader.ReadInt32();
                    height = treader.ReadInt32();
                    treader.ReadBytes(rawdata);
                }
                Texture2D mtex = maincontext.createTexture2D(rawdata, width, height);
                List<VertexPositionNormalTexture> triangle = new List<VertexPositionNormalTexture>();
                triangle.Add(new VertexPositionNormalTexture(new Vector3(-.5f,-.5f,0),new Vector3(1,1,1),new Vector2(0,0)));
                triangle.Add(new VertexPositionNormalTexture(new Vector3(0,0.5f,0),new Vector3(1,1,1),new Vector2(1,0)));
                triangle.Add(new VertexPositionNormalTexture(new Vector3(.5f,-0.5f,0),new Vector3(1,1,1),new Vector2(1,1)));
                byte[] gpudata = VertexPositionNormalTexture.Serialize(triangle.ToArray());

                VertexBuffer mbuffer = maincontext.createVertexBuffer(gpudata,VertexPositionNormalTexture.Size);
                mbuffer.Apply(VertexPositionNormalTexture.Size);
                vertcount = 3;
                Windows.UI.Popups.MessageDialog tdlg = new Windows.UI.Popups.MessageDialog("Unit tests successfully completed\nShader creation: Success\nTexture load: Success\nVertex buffer creation: Success\nTime:"+(DateTime.Now-started).ToString(), "Results");
                tdlg.ShowAsync().Start();
            }
            catch (Exception er)
            {
                Windows.UI.Popups.MessageDialog tdlg = new Windows.UI.Popups.MessageDialog(er.ToString(), "Fatal error");
                tdlg.ShowAsync().Start();
            }
        }    
    }
}