vs2010でmanaged directx その4

#概要
C#で、３Dがやりたかった。
インデックスバッファやってみた。

#写真

![image](https://qiita-image-store.s3.amazonaws.com/0/18104/ec9f029c-d7ae-e9b1-6b1f-df1dd31d06ea.png)

#サンプルコード

```
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

using Microsoft.DirectX;
using Microsoft.DirectX.Direct3D;

namespace WindowsFormsApplication4
{
    public partial class Form1 : Form
    {
        private Device device = null;
        private VertexBuffer _vertexBuffer = null;
        private IndexBuffer _indexBuffer = null;
        private static Int16[] _vertexIndices = new Int16[] { 
			2, 0, 1, 
            1, 3, 2, 
            4, 0, 2, 
            2, 6, 4,
			5, 1, 0, 
            0, 4, 5, 
            7, 3, 1, 
            1, 5, 7, 
			6, 2, 3, 
            3, 7, 6, 
            4, 6, 7, 
            7, 5, 4 
		};
        public Form1()
        {
            InitializeComponent();
            this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.Opaque, true);
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            PresentParameters presentParams = new PresentParameters();
            presentParams.Windowed = true;
            presentParams.SwapEffect = SwapEffect.Discard;
            device = new Device(0, DeviceType.Hardware, this, CreateFlags.SoftwareVertexProcessing, presentParams);
            _vertexBuffer = new VertexBuffer(typeof(CustomVertex.PositionColored), 8, device, Usage.None, CustomVertex.PositionColored.Format, Pool.Managed);
            CustomVertex.PositionColored[] vertices = new CustomVertex.PositionColored[8];
            vertices[0] = new CustomVertex.PositionColored(-1.0f, 1.0f, 1.0f, Color.Yellow.ToArgb());
            vertices[1] = new CustomVertex.PositionColored(1.0f, 1.0f, 1.0f, Color.Gray.ToArgb());
            vertices[2] = new CustomVertex.PositionColored(-1.0f, 1.0f, -1.0f, Color.Purple.ToArgb());
            vertices[3] = new CustomVertex.PositionColored(1.0f, 1.0f, -1.0f, Color.Red.ToArgb());
            vertices[4] = new CustomVertex.PositionColored(-1.0f, -1.0f, 1.0f, Color.SkyBlue.ToArgb());
            vertices[5] = new CustomVertex.PositionColored(1.0f, -1.0f, 1.0f, Color.Orange.ToArgb());
            vertices[6] = new CustomVertex.PositionColored(-1.0f, -1.0f, -1.0f, Color.Green.ToArgb());
            vertices[7] = new CustomVertex.PositionColored(1.0f, -1.0f, -1.0f, Color.Blue.ToArgb());
            using (GraphicsStream data = _vertexBuffer.Lock(0, 0, LockFlags.None))
            {
                data.Write(vertices);
                _vertexBuffer.Unlock();
            }
            _indexBuffer = new IndexBuffer(device, 12 * 3 * 2, Usage.WriteOnly, Pool.Managed, true);
            using (GraphicsStream data = _indexBuffer.Lock(0, 0, LockFlags.None))
            {
                data.Write(_vertexIndices);
                this._indexBuffer.Unlock();
            }
        }
        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            device.Clear(ClearFlags.Target, Color.Blue, 1.0f, 0);
            Matrix view,
                w;
            w = Matrix.RotationY(Environment.TickCount / 1000.0f);
            view = Matrix.Translation(0, 0, 10);
            view = w * view;
            device.SetTransform(TransformType.View, view);
            device.Transform.Projection = Matrix.PerspectiveFovLH((float)Math.PI / 4, 1.0f, 1.0f, 100.0f);
            device.RenderState.Lighting = false;
            device.BeginScene();
            device.SetStreamSource(0, _vertexBuffer, 0);
            device.VertexFormat = CustomVertex.PositionColored.Format;
            device.Indices = _indexBuffer;
            device.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, 8, 0, 12);
            device.EndScene();
            device.Present();
            this.Invalidate();
        }
    }
}



```

以上。