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

namespace Test_DirectX
{
	class DirectXHandler : Form
	{
		private Device D3DDevice;
		private float Theta = 0f;
		private CustomVertex.PositionColored[]	Vertices;
		private VertexBuffer VBuf;
		private int[] Indices;
		private IndexBuffer IBuf;

		public DirectXHandler()
		{
			PresentParameters PresParams = new PresentParameters();
			PresParams.SwapEffect = SwapEffect.Discard;
			PresParams.Windowed = true;
			D3DDevice = new Device(0, DeviceType.Hardware, this, 
						CreateFlags.SoftwareVertexProcessing, PresParams);
		}

		public void WindowSetUp()
		{
			this.ClientSize = new Size(640, 480);
			this.Name = "DirectXHandler";
			this.Text = "DirectX";
			this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.Opaque, true);
		}

		public void CameraSetUp()
		{
			D3DDevice.Transform.Projection = Matrix.PerspectiveFovLH((float)Math.PI/4, 
	                              this.Width/this.Height, 1f, 100f);
			D3DDevice.Transform.View = Matrix.LookAtLH(new Vector3(0f, 0f, -30f), new Vector3(0f, 0f, 0f),
	                              new Vector3(0f, 1f, 0f));
			D3DDevice.RenderState.Lighting = false;
			D3DDevice.RenderState.CullMode = Cull.None;
			D3DDevice.RenderState.FillMode = FillMode.WireFrame;
		}

		protected  override void OnPaint(PaintEventArgs e)
		{
			D3DDevice.Clear(ClearFlags.Target, Color.DarkBlue, 1f, 0);

			D3DDevice.BeginScene();
			D3DDevice.VertexFormat = CustomVertex.PositionColored.Format;
			D3DDevice.SetStreamSource(0, VBuf, 0);
			D3DDevice.Indices = IBuf;
			D3DDevice.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, 5, 0, 2);
			D3DDevice.EndScene();

			D3DDevice.Present();
			this.Invalidate();
			Theta += 0.05f;
		}

		public void VertexBufferSetUp()
		{
			VBuf = new VertexBuffer(typeof(CustomVertex.PositionColored), 5, D3DDevice,
				Usage.Dynamic | Usage.WriteOnly, CustomVertex.PositionColored.Format, Pool.Default);

			Vertices = new CustomVertex.PositionColored[5];
			Vertices[0].Position = (new Vector3(0f, 0f, 0f));
			Vertices[0].Color = Color.White.ToArgb();
			Vertices[1].Position = (new Vector3(5f, 0f, 0f));
			Vertices[1].Color = Color.White.ToArgb();
			Vertices[2].Position = (new Vector3(10f, 0f, 0f));
			Vertices[2].Color = Color.White.ToArgb();
			Vertices[3].Position = (new Vector3(5f, 5f, 0f));
			Vertices[3].Color = Color.White.ToArgb();
			Vertices[4].Position = (new Vector3(10f, 5f, 0f));
			Vertices[4].Color = Color.White.ToArgb();

			VBuf.SetData(Vertices, 0, LockFlags.None);
		}

		public void IndexBufferSetUp()
		{
			IBuf = new IndexBuffer(typeof(int), 6, D3DDevice, Usage.WriteOnly, Pool.Default);
			Indices = new int[6];

			Indices[0]=3;
			Indices[1]=1;
			Indices[2]=0;
			Indices[3]=4;
			Indices[4]=2;
			Indices[5]=1;

			IBuf.SetData(Indices, 0, LockFlags.None);
		}

		public static void Main(string[] args)
		{
			using(DirectXHandler DXHandler = new DirectXHandler())
			{
				DXHandler.WindowSetUp();
				DXHandler.CameraSetUp();
				DXHandler.VertexBufferSetUp();
				DXHandler.IndexBufferSetUp();
				Application.Run(DXHandler);
			}
		}
	}
}