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我们正在尝试使用 Xamarin 制作一个应用程序，该应用程序将在特定屏幕上的 GLKView 中有一个小的动画脸。我们一直在寻找渲染精灵的解决方案，而我们想出的最佳解决方案源于这里的解决方案。我们甚至无法在 GLKView 中绘制简单的图像，并且输出中的错误实际上没有意义。我们正在将其从 iOS 转换为 Xamarin C#，因此某些调用之间存在差异，但我们已尝试保持大多数部分的完整性。

以下是与此相关的代码部分：

public class Sprite : NSObject
{
    public void Render()
    {
        Effect.Texture2d0.GLName = TextureInfo.Name;
        Effect.Texture2d0.Enabled = true;

        Effect.PrepareToDraw();

        GL.EnableVertexAttribArray((int)GLKVertexAttrib.Position);
        GL.EnableVertexAttribArray((int)GLKVertexAttrib.TexCoord0);

        IntPtr ptr = Marshal.AllocHGlobal(Marshal.SizeOf(Quad));
        Marshal.StructureToPtr(Quad, ptr, false);
        int offset = (int)ptr;

        GL.VertexAttribPointer((uint)GLKVertexAttrib.Position, 2, VertexAttribPointerType.Float, false, Marshal.SizeOf(typeof(TexturedVertex)), offset + (int)Marshal.OffsetOf(typeof(TexturedVertex), "geomertryVertex"));
        GL.VertexAttribPointer((uint)GLKVertexAttrib.Position, 2, VertexAttribPointerType.Float, false, Marshal.SizeOf(typeof(TexturedVertex)), offset + (int)Marshal.OffsetOf(typeof(TexturedVertex), "textureVertex"));

        GL.DrawArrays(BeginMode.TriangleStrip, 0, 4);

        Marshal.FreeHGlobal(ptr);
    }
}

Sprite.Render() 在此 GLKViewController 中被调用：

public class AnimationViewController : GLKViewController
{
    GLKView animationView;
    EAGLContext context;
    Sprite player;
    GLKBaseEffect effect;

    public override void ViewDidLoad()
    {
        base.ViewDidLoad();

        context = new EAGLContext(EAGLRenderingAPI.OpenGLES2);

        if (context == null)
            Console.WriteLine("Failed to create ES context...");

        animationView = new GLKView(new RectangleF(UIScreen.MainScreen.Bounds.Width * 0.05f,
                                          UIScreen.MainScreen.Bounds.Height * 0.05f,
                                          UIScreen.MainScreen.Bounds.Width * 0.9f,
                                          UIScreen.MainScreen.Bounds.Height * 0.75f), context);

        EAGLContext.SetCurrentContext(context);

        animationView.DrawInRect += new EventHandler<GLKViewDrawEventArgs>(animationView_DrawInRect);

        View.AddSubview(animationView);

        effect = new GLKBaseEffect();
        Matrix4 projectionMatrix = Matrix4.CreateOrthographicOffCenter(0, animationView.Frame.Width, 0, animationView.Frame.Height, -1024, 1024);
        effect.Transform.ProjectionMatrix = projectionMatrix;
        player = new Sprite(@"Player.png", effect);
    }

    void animationView_DrawInRect(object sender, GLKViewDrawEventArgs e)
    {
        GL.ClearColor(0.98f, 0.98f, 0.98f, 1.0f);
        //GL.Clear((uint)(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit));
        GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
        GL.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha);
        GL.Enable(EnableCap.Blend);

        player.Render();
    }
}

整个代码文件的链接：

4

1 回答 1

1

看起来问题只是第二次调用VertexAttribPointer. 第二个GLKVertexAttrib.Position应该是GLKVertexAttrib.TexCoord0：

GL.VertexAttribPointer((uint)GLKVertexAttrib.Position, 2, VertexAttribPointerType.Float, false, Marshal.SizeOf(typeof(TexturedVertex)), offset + (int)Marshal.OffsetOf(typeof(TexturedVertex), "geomertryVertex"));
GL.VertexAttribPointer((uint)GLKVertexAttrib.TexCoord0, 2, VertexAttribPointerType.Float, false, Marshal.SizeOf(typeof(TexturedVertex)), offset + (int)Marshal.OffsetOf(typeof(TexturedVertex), "textureVertex"));
于 2013-07-08T18:46:05.297 回答