在OpenGL中将纹理应用到正方形时出现的问题

我被困在无法将纹理映射到openGLES中的正方形中。我试图在屏幕上显示一个jpg图像，为了让我做到这一点，我画了一个正方形，然后将图像映射到上面。然而，我得到的所有输出都是白色方块。我不知道我做错了什么。而这个问题阻止了我继续我的项目。我为Windows Mobile使用Managed OpenGL ES wrapper。我证实纹理加载正确，但我无法将其应用于我的对象。我上传了示例项目，显示我的问题here。你需要VS2008和Windows Mobile 6 SDK才能运行它。我还发布了在这里呈现和贴图对象的表单的代码。任何建议都将非常感激，因为我一直在这个问题上停留了一段时间，我无法弄清楚我做错了什么。在OpenGL中将纹理应用到正方形时出现的问题

public partial class Form1 : Form 
{ 
    [DllImport("coredll")] 
    extern static IntPtr GetDC(IntPtr hwnd); 

    EGLDisplay myDisplay; 
    EGLSurface mySurface; 
    EGLContext myContext; 

    public Form1() 
    { 
     InitializeComponent(); 
     myDisplay = egl.GetDisplay(new EGLNativeDisplayType(this)); 

     int major, minor; 
     egl.Initialize(myDisplay, out major, out minor); 

     EGLConfig[] configs = new EGLConfig[10]; 
     int[] attribList = new int[] 
     { 
      egl.EGL_RED_SIZE, 5, 
      egl.EGL_GREEN_SIZE, 6, 
      egl.EGL_BLUE_SIZE, 5, 
      egl.EGL_DEPTH_SIZE, 16 , 
      egl.EGL_SURFACE_TYPE, egl.EGL_WINDOW_BIT, 
      egl.EGL_STENCIL_SIZE, egl.EGL_DONT_CARE, 
      egl.EGL_NONE, egl.EGL_NONE 
     }; 

     int numConfig; 
     if (!egl.ChooseConfig(myDisplay, attribList, configs, configs.Length, out numConfig) || numConfig < 1) 
      throw new InvalidOperationException("Unable to choose config."); 

     EGLConfig config = configs[0]; 
     mySurface = egl.CreateWindowSurface(myDisplay, config, Handle, null); 
     myContext = egl.CreateContext(myDisplay, config, EGLContext.None, null); 

     egl.MakeCurrent(myDisplay, mySurface, mySurface, myContext); 
     gl.ClearColor(0, 0, 0, 0); 
     InitGL(); 
    } 

    void InitGL() 
    { 
     gl.ShadeModel(gl.GL_SMOOTH); 
     gl.ClearColor(0.0f, 0.0f, 0.0f, 0.5f); 
     gl.BlendFunc(gl.GL_SRC_ALPHA, gl.GL_ONE_MINUS_SRC_ALPHA); 
     gl.Hint(gl.GL_PERSPECTIVE_CORRECTION_HINT, gl.GL_NICEST); 
    } 

    public unsafe void DrawGLScene() 
    { 
     gl.MatrixMode(gl.GL_PROJECTION); 
     gl.LoadIdentity(); 
     gl.Orthof(0, ClientSize.Width, ClientSize.Height, 0, 0, 1); 
     gl.Disable(gl.GL_DEPTH_TEST); 

     gl.MatrixMode(gl.GL_MODELVIEW); 
     gl.LoadIdentity(); 

     Texture myImage; 
     Bitmap Image = new Bitmap(@"\Storage Card\Texture.jpg"); 
     using (MemoryStream ms = new MemoryStream()) 
     { 
      Image.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp); 
      myImage = Texture.LoadStream(ms, false); 
     } 

     float[] rectangle = new float[] { 
       0, 0, 
       myImage.Width, 0, 
       0, myImage.Height, 
       myImage.Width, myImage.Height 
      }; 

     float[] texturePosition = new float[] { 
       0, 0, 
       myImage.Width, 0, 
       0, myImage.Height, 
       myImage.Width, myImage.Height 
      }; 

     //Bind texture 
     gl.BindTexture(gl.GL_TEXTURE_2D, myImage.Name); 
     gl.TexParameteri(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MIN_FILTER, gl.GL_LINEAR); 
     gl.TexParameteri(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MAG_FILTER, gl.GL_LINEAR); 
     gl.EnableClientState(gl.GL_TEXTURE_COORD_ARRAY); 
     gl.EnableClientState(gl.GL_VERTEX_ARRAY); 

     //draw square and texture it. 
     fixed (float* rectanglePointer = &rectangle[0], positionPointer = &texturePosition[0]) 
     { 
      gl.TexCoordPointer(2, gl.GL_FLOAT, 0, (IntPtr)positionPointer); 
      gl.VertexPointer(2, gl.GL_FLOAT, 0, (IntPtr)rectanglePointer); 
      gl.DrawArrays(gl.GL_TRIANGLE_STRIP, 0, 4); 
     } 

     gl.DisableClientState(gl.GL_TEXTURE_COORD_ARRAY); 
     gl.DisableClientState(gl.GL_VERTEX_ARRAY); 

    } 

    protected override void OnPaintBackground(PaintEventArgs e) 
    { 

    } 

    protected override void OnPaint(PaintEventArgs e) 
    { 
     base.OnPaint(e); 
     gl.Clear(gl.GL_COLOR_BUFFER_BIT); 

     DrawGLScene(); 
     egl.SwapBuffers(myDisplay, mySurface); 
     gl.Clear(gl.GL_COLOR_BUFFER_BIT); 
    } 

    protected override void OnClosing(CancelEventArgs e) 
    { 
     if (!egl.DestroySurface(myDisplay, mySurface)) 
      throw new Exception("Error while destroying surface."); 
     if (!egl.DestroyContext(myDisplay, myContext)) 
      throw new Exception("Error while destroying context."); 
     if (!egl.Terminate(myDisplay)) 
      throw new Exception("Error while terminating display."); 
     base.OnClosing(e); 
    } 
}

来源

2009-01-24 Ilya Volodin