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

namespace blue_dish_te
{
	/// <summary>
	/// Objekt pro vykreslovani stropu. Objekt si vytvori VertexBuffer a naplni jej vrcholy.
	/// Metoda Render vykresli buffer do zarizeni device (parametr konstruktoru)
	/// </summary>
	internal class Strop
	{
		private Device device;
		private VertexBuffer vb = null;
		private Texture t;

		public char type = ' ';

		/// <summary>
		/// Konstruktor vytvori VertexBuffer a naplni ho souradnicemi
		/// </summary>
		/// <param name="dev">Reference na device do ktereho se bude kreslit</param>
		public Strop(Device dev)
		{
			device = dev;

			//inicializace textury
			try
			{
				t = TextureLoader.FromFile(device, "textury/strop.jpg");
			}
			catch (Exception e) 
			{
				MessageBox.Show("Nepovedlo se nacist texturu pro strop.");
				Console.WriteLine(e);
				return;
			}
			//nacteni bodu
			vb = new VertexBuffer(typeof(CustomVertex.PositionNormalTextured), //buffer obsahuje pouze souradnice, normaly a nastaveni pozic na texture
			                      5, //celkem 5 bodu
			                      device, //zarizeni pro ktere je buffer vytovren
			                      Usage.WriteOnly, //do bufferu se bude pouze zapisovat
			                      CustomVertex.PositionNormalTextured.Format, //format vrcholu
			                      Pool.Managed); //jakym zpusobem je VB zpravovan
			//uzamceni VB a ziskani pole
			CustomVertex.PositionNormalTextured[] v = (CustomVertex.PositionNormalTextured[]) vb.Lock(0, 0);

			//naplneni VB souradnicemi vrcholu             x  y  z nx ny nz  u  v
			v[0] = new CustomVertex.PositionNormalTextured(2, 3, 2, 0, -1, 0, 1, 1);
			v[1] = new CustomVertex.PositionNormalTextured(0, 3, 2, 0, -1, 0, 0, 1);
			v[2] = new CustomVertex.PositionNormalTextured(2, 3, 0, 0, -1, 0, 1, 0);
			v[3] = new CustomVertex.PositionNormalTextured(0, 3, 2, 0, -1, 0, 0, 1);
			v[4] = new CustomVertex.PositionNormalTextured(0, 3, 0, 0, -1, 0, 0, 0);
			vb.Unlock(); //odemknuti VB 
		}

		/// <summary>
		/// Vykresleni VertexBufferu jako trojuhelnikoveho stripu
		/// </summary>
		public void Render()
		{
			device.SetTexture(0, t); // nastaveni textury
			device.SetStreamSource(0, vb, 0); //nastaveni zdroje dat
			device.VertexFormat = CustomVertex.PositionNormalTextured.Format; //format dat
			device.DrawPrimitives(PrimitiveType.TriangleStrip, 0, 3); //vykresleni VB jako TriangleStrip
		}
	}
}