Z値のあるスプライト描画（Sprite）

using System;
using System.Drawing;
using System.Windows.Forms;
using Microsoft.DirectX;
using Microsoft.DirectX.Direct3D;

namespace Project2
{
    /// <summary>
    /// md3d2 の概要の説明です。
    /// </summary>
    public class md3d2:Form
    {
        /// <summary>
        /// テクスチャの座標
        /// </summary>
        private Vector3 texturePos =new Vector3(0,0,0);


        public md3d2():base()
        {
            //最小サイズを設定
            this.MinimumSize=new Size(80,60);

            this.Size = new Size(300,300);

            this.Text ="Direct3D-My";
            this.KeyDown+=new KeyEventHandler(md3d2_KeyDown);
        }

        private Device device_;
        private PresentParameters presentParam_;

        /// <summary>
        /// スプライトを行うためのもの
        /// </summary>
        private Sprite sprite_;

        /// <summary>
        /// Direct3Dの初期化を行います。
        /// </summary>
        /// <returns>初期化が成功したかどうか</returns>
        public bool DXInitialize()
        {
            try
            {
                //プレゼンテーションパラメータを作成
                presentParam_ = new PresentParameters();

                //ウィンドウモード
                presentParam_.Windowed =true;

                //スワップエフェクトを設定。
                presentParam_.SwapEffect = SwapEffect.Discard;
                presentParam_.AutoDepthStencilFormat = DepthFormat.D16;
                presentParam_.EnableAutoDepthStencil =true;

                //デバイスを作成
                device_ = new Device(0,DeviceType.Hardware,this
                    ,CreateFlags.HardwareVertexProcessing,presentParam_);


                createTexture();
                createMesh();

                sprite_ = new Sprite(device_);


                //初期化成功
                return true;
            }
            catch
            {
                //初期化失敗
                return false;
            }

        }



        /// <summary>
        /// テクスチャ
        /// </summary>
        private Texture spriteTexture_;

        /// <summary>
        ///
        /// </summary>
        private void createTexture()
        {
            string openTexture
                = @"I:\temp\Atbl.png";
            //ここを書き換える。絶対パスの方が扱いやすいです。

            spriteTexture_ = TextureLoader.FromFile(device_ ,openTexture);
        }

        private Mesh boxMesh_;

        private void createMesh()
        {
            boxMesh_ = Mesh.Box(device_,2,2,2);
        }


        public void Render()
        {
            if(device_==null)return;
            if(this.WindowState ==FormWindowState.Minimized)return;

            device_.Clear(ClearFlags.Target|ClearFlags.ZBuffer,Color.Blue,1.0f,0);

            //カメラの設定を行う
            device_.Transform.View = Matrix.LookAtLH(
                new Vector3( 5.0f, 5.0f, 5.0f ),
                new Vector3( 0.0f, 0.0f, 0.0f ),
                new Vector3( 0.0f, 1.0f, 0.0f ) );
            device_.Transform.Projection =
                Matrix.PerspectiveFovLH((float)Math.PI / 4,
                (float)this.ClientSize.Width / (float)this.ClientSize.Height,
                5.0f, 15.0f);

            //device_.RenderState.Lighting =false;

            //ライトの設定
            device_.Lights[0].Direction =Vector3.Normalize(new Vector3(-1,-2,-3));
            device_.Lights[0].Type = LightType.Directional;

            device_.Lights[0].Diffuse = Color.FromArgb(255,255,255);
            device_.Lights[0].Ambient = Color.FromArgb(40,40,40);

            device_.Lights[0].Enabled =true;
            device_.Lights[0].Update();



            //マテリアルの設定
            Material mat =new Material();
            mat.AmbientColor = new ColorValue(1.0f,1.0f,1.0f);
            mat.DiffuseColor = new ColorValue(1.0f,1.0f,1.0f);
            device_.Material = mat;


            device_.BeginScene();

            boxMesh_.DrawSubset(0);

            sprite_.Begin(SpriteFlags.None);

            sprite_.Draw(spriteTexture_,new Vector3(0,0,0),texturePos,Color.White.ToArgb());

            sprite_.End();

            device_.EndScene();

            try
            {
                //更新
                device_.Present();
            }
            catch(DeviceLostException)
            {
                resetDevice();
            }

        }

        /// <summary>
        /// デバイスのリセットを行う
        /// </summary>
        private void resetDevice()
        {
            int result;
            if(!device_.CheckCooperativeLevel(out result))
            {
                if(result ==(int)ResultCode.DeviceLost)
                {
                    //ちょっと待つ
                    System.Threading.Thread.Sleep(10);
                }
                else if(result ==(int)ResultCode.DeviceNotReset)
                {
                    device_.Reset(presentParam_);
                }
            }
        }

        private void md3d2_KeyDown(object sender, KeyEventArgs e)
        {
            switch(e.KeyCode)
            {
            case Keys.Down:
                if(e.Shift)
                {
                    texturePos.Z+=0.1f;
                    if(texturePos.Z >1)texturePos.Z = 1;
                }
                else
                {
                    texturePos.Y+=5;
                }
                break;
            case Keys.Up:
                if(e.Shift)
                {
                    texturePos.Z-=0.1f;
                    if(texturePos.Z < 0)texturePos.Z = 0;
                }
                else
                {
                    texturePos.Y-=5;
                }
                break;
            case Keys.Left:
                texturePos.X-=5;
                break;
            case Keys.Right:
                texturePos.X+=5;
                break;
            }
        }
    }

    /// <summary>
    /// エントリクラス
    /// </summary>
    class Program
    {
        public static void Main()
        {
            using(md3d2 dxform =new md3d2())
            {
                if(!dxform.DXInitialize())
                {
                    MessageBox.Show("Diret3Dの初期化に失敗しました。"
                        ,"初期化の失敗");
                    return;
                }
                dxform.Show();

                while(dxform.Created)
                {
                    dxform.Render();
                    Application.DoEvents();
                }
            }
        }
    }
}