topical media & game development

topical media & game development

[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

game-xna-intro-XnaShooter-Graphics-TangentVertex.cs / cs


  // Project: XnaShooter, File: TangentVertex.cs
  // Namespace: XnaShooter.Graphics, Class: 
  // Path: C:\code\XnaShooter\Graphics, Author: Abi
  // Code lines: 195, Size of file: 5,52 KB
  // Creation date: 30.08.2006 11:38
  // Last modified: 02.09.2006 06:18
  // Generated with Commenter by abi.exDream.com
  
  #region Using directives
  using Microsoft.Xna.Framework;
  using Microsoft.Xna.Framework.Graphics;
  using System;
  using System.Collections;
  using System.Text;
  using XnaShooter.Game;
  #endregion
  
  namespace XnaShooter.Graphics
  {

<summary> TangentVertex, extracted from Abi.Graphic engine for NormalMapCompressor. More information can be found at: http://exdream.dyn.ee/blog/PermaLink.aspx?guid=cd2c85b3-13e6-48cd-953e-f7e3bb79fbc5

<para/>

Tangent vertex format for shader vertex format used all over the place. DirectX9 or XNA does not provide this crazy format ^^ It contains: Position, Normal vector, texture coords, tangent vector. </summary> public struct TangentVertex { #region Variables <summary> Position </summary> public Vector3 pos; <summary> Texture coordinates </summary> public Vector2 uv; <summary> Normal </summary> public Vector3 normal; <summary> Tangent </summary> public Vector3 tangent;

<summary> Stride size, in XNA called SizeInBytes. I'm just conforming with that. Btw: How is this supposed to work without using unsafe AND without using System.Runtime.InteropServices.Marshal.SizeOf? </summary> public static int SizeInBytes { get { // 4 bytes per float: // 3 floats pos, 2 floats uv, 3 floats normal and 3 float tangent. return 4 * (3 + 2 + 3 + 3); } // get } // StrideSize

<summary> U texture coordinate </summary> <returns>Float</returns> public float U { get { return uv.X; } // get } // U

<summary> V texture coordinate </summary> <returns>Float</returns> public float V { get { return uv.Y; } // get } // V #endregion


                  #region Constructor

<summary> Create tangent vertex </summary> <param name="setPos">Set position</param> <param name="setU">Set u texture coordinate</param> <param name="setV">Set v texture coordinate</param> <param name="setNormal">Set normal</param> <param name="setTangent">Set tangent</param> public TangentVertex( Vector3 setPos, float setU, float setV, Vector3 setNormal, Vector3 setTangent) { pos = setPos; uv = new Vector2(setU, setV); normal = setNormal; tangent = setTangent; } // TangentVertex(setPos, setU, setV)

<summary> Create tangent vertex </summary> <param name="setPos">Set position</param> <param name="setUv">Set uv texture coordinates</param> <param name="setNormal">Set normal</param> <param name="setTangent">Set tangent</param> public TangentVertex( Vector3 setPos, Vector2 setUv, Vector3 setNormal, Vector3 setTangent) { pos = setPos; uv = setUv; normal = setNormal; tangent = setTangent; } // TangentVertex(setPos, setUv, setNormal) #endregion


                  #region To string

<summary> To string </summary> public override string ToString() { return "TangentVertex(pos=" + pos + ", " + "u=" + uv.X + ", " + "v=" + uv.Y + ", " + "normal=" + normal + ", " + "tangent=" + tangent + ")"; } // ToString() #endregion


                  #region Generate vertex declaration

<summary> Vertex elements for Mesh.Clone </summary> public static readonly VertexElement[] VertexElements = GenerateVertexElements();

<summary> Vertex declaration for vertex buffers. </summary> public static VertexDeclaration VertexDeclaration = new VertexDeclaration(BaseGame.Device, VertexElements);

<summary> Generate vertex declaration </summary> private static VertexElement[] GenerateVertexElements() { VertexElement[] decl = new VertexElement[] { // Construct new vertex declaration with tangent info // First the normal stuff (we should already have that) new VertexElement(0, 0, VertexElementFormat.Vector3, VertexElementMethod.Default, VertexElementUsage.Position, 0), new VertexElement(0, 12, VertexElementFormat.Vector2, VertexElementMethod.Default, VertexElementUsage.TextureCoordinate, 0), new VertexElement(0, 20, VertexElementFormat.Vector3, VertexElementMethod.Default, VertexElementUsage.Normal, 0), // And now the tangent new VertexElement(0, 32, VertexElementFormat.Vector3, VertexElementMethod.Default, VertexElementUsage.Tangent, 0), }; return decl; } // GenerateVertexElements() #endregion


                  #region Is declaration tangent vertex declaration

<summary> Returns true if declaration is tangent vertex declaration. </summary> public static bool IsTangentVertexDeclaration( VertexElement[] declaration) { return declaration.Length == 4 && declaration[0].VertexElementUsage == VertexElementUsage.Position && declaration[1].VertexElementUsage == VertexElementUsage.TextureCoordinate && declaration[2].VertexElementUsage == VertexElementUsage.Normal && declaration[3].VertexElementUsage == VertexElementUsage.Tangent; } // IsTangentVertexDeclaration(declaration) #endregion } // struct TangentVertex } // namespace XnaShooter.Graphics

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