/// <summary>
/// Creates a deep-copy of the current <see cref="IGraphicsStream"/>.
/// </summary>
/// <returns>A deep-copy of the current <see cref="IGraphicsStream"/>.</returns>
public override IGraphicsStream Clone()
{
IGraphicsStream stream = new IndexStream16(this.Size);
stream.Copy(this);
return(stream);
}
/// <summary>
/// Creates an IndexStream from a certain number of vertices that are organised in quads.
/// </summary>
/// <param name="quadNum">The number of quads.</param>
/// <returns>The created indexStream.</returns>
public static IndexStream FromQuads(int quadNum)
{
IndexStream indexStream;
if (quadNum * 6 > ushort.MaxValue)
{
indexStream = new IndexStream32(quadNum * 6);
}
else
{
indexStream = new IndexStream16(quadNum * 6);
}
int iIndex = 0;
int iVertex = 0;
for (int i = 0; i < quadNum; i++, iIndex += 6, iVertex += 4)
{
indexStream[iIndex + 0] = iVertex;
indexStream[iIndex + 1] = (iVertex + 1);
indexStream[iIndex + 2] = (iVertex + 3);
indexStream[iIndex + 3] = (iVertex + 3);
indexStream[iIndex + 4] = (iVertex + 1);
indexStream[iIndex + 5] = (iVertex + 2);
}
return(indexStream);
}
//---------------------------------------------------------------
#endregion
//---------------------------------------------------------------
//---------------------------------------------------------------
#region Methods
//---------------------------------------------------------------
/// <summary>
/// Creates an IndexStream from a list of triangles
/// </summary>
/// <param name="triangles"></param>
public static IndexStream16 FromTriangles(System.Collections.ICollection triangles)
{
IndexStream16 index = new IndexStream16(triangles.Count * 3);
int i = 0;
foreach (Triangle tri in triangles)
{
index[i++] = tri.A;
index[i++] = tri.B;
index[i++] = tri.C;
}
return(index);
}
/// <summary>
/// creates an indexed vertexUnit and the indexStream from the current vertexUnit
/// </summary>
/// <param name="vertexUnit">created vertexUnit</param>
/// <param name="indexStream">created indexStream</param>
public void Indexify(out VertexUnit vertexUnit, out VertexStreams.IndexStream indexStream)
{
object[] currentVertex = new object[StreamCount];
Hashtable vertices = new Hashtable();
int vertexNum = 0;
int currentIndex = 0;
indexStream = new VertexStreams.IndexStream16(Size);
// TODO: Size is much too high for vertexUnit
// calc real size
vertexUnit = new VertexUnit(format, Size);
for (int i = 0; i < Size; i++)
{
// fill vertex
for (int j = 0; j < StreamCount; j++)
{
currentVertex[j] = this[j].Data.GetValue(i);
}
// calc current index
if (vertices.Contains(currentVertex))
{
currentIndex = (int)vertices[currentVertex];
}
else
{
vertices.Add(currentVertex, vertexNum);
currentIndex = vertexNum;
vertexNum++;
// add new vertex to new streams
for (int j = 0; j < StreamCount; j++)
{
vertexUnit[j].Data.SetValue(currentVertex[j], j);
}
}
indexStream[i] = currentIndex;
}
}
