Question

是否有关于如何在DirecX for Windows 8 Developer预览中绘制简单三角形的好教程？游戏示例太复杂，无法理解新DirectX版本的“基本”工作方式（这似乎与DirectX 9完全不同）。

Answer 1

示例的要点是Windows 8，而不是DirectX。您需要在使用Windows 8进行之前学习DirectX11 。您正在尝试阅读两种技术之间互操作的示例，这两种技术都不是您理解的。 Windows 8 Dev Preview的重点不是教DirectX。

Answer 2

想出来。见下面的代码。唯一不起作用的是纹理（它显示为白色而不是显示图像，但至少它显示三角形！）（这段代码显然不是整个程序。原来它涉及到相当这些天只绘制三角形的很多复杂代码！）

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();
            }
        }    
    }
}

适用于Windows 8的任何简单的DirectX示例（开发人员预览版）？

2 个答案: