/// <summary>
/// Parses a vertex found in a polygon's vertex list. Parses texture and
/// lightmap coordinates based on the polygon's material type.
/// </summary>
/// <param name="xmlNode">Xml Poly node</param>
/// <param name="dxsPrim">Dxs Primitive this Poly belongs to</param>
/// <param name="dxsPoly">Dxs Poly the vertex belongs to</param>
private void ParseVertex(XmlNode xmlNode, DxsPrimitive dxsPrim, DxsPoly dxsPoly)
{
//Get the vertex ID so we can look up the position info
int vid = int.Parse(xmlNode.Attributes["vid"].Value);
//Copy the master vertex (position + vertex color)
DxsVertex vertex = new DxsVertex(dxsPrim.MasterVertexList[vid]);
//Get the material of the polygon
DxsMaterial material = dxsPrim.Materials[dxsPoly.MaterialID];
//If the first layer is a texture, parse texture coordinates
if (material.Layers.Count > 0 && material.Layers[0].MaterialType == MaterialType.Texture)
{
float u0 = float.Parse(xmlNode.Attributes["u0"].Value);
float v0 = float.Parse(xmlNode.Attributes["v0"].Value);
vertex.TextureCoordinate = new Vector2(u0, v0);
}
//If one of the layers (last one) is a lightmap, parse its texture coordinates
for (int i = 1; i < material.Layers.Count; i++)
{
if (material.Layers[i].MaterialType == MaterialType.Lightmap)
{
float ui = float.Parse(xmlNode.Attributes["u" + i].Value);
float vi = float.Parse(xmlNode.Attributes["v" + i].Value);
vertex.LightMapCoordinate = new Vector2(ui, vi);
break;
}
}
//Add vertex to the poly
dxsPoly.Vertices.Add(vertex);
}
/// <summary>
/// Parses a vertex listing in a primitive node, this pertains to the
/// position data used by the primitive - hence it being the "master list".
/// All other data such as texture coordinates are referenced by the vertex
/// ID's to these vertices.
///
/// Also, if a vertex color is supplied it will be caught here. By default
/// vertex colors are white, and if a single vertex color is found the
/// dxs primitive is enabled to use vertex colors.
/// </summary>
/// <param name="xmlNode">Xml primitive node</param>
/// <param name="dxsPrim">Dxs primitive</param>
private void ParseMasterVertex(XmlNode xmlNode, DxsPrimitive dxsPrim)
{
//Parse attributes
int vid = int.Parse(xmlNode.Attributes["id"].Value);
float x = float.Parse(xmlNode.Attributes["x"].Value);
float y = float.Parse(xmlNode.Attributes["y"].Value);
float z = float.Parse(xmlNode.Attributes["z"].Value);
int jointID = -1;// int.Parse(xmlNode.Attributes["jointID"].Value);
//create a new dxs vertex
DxsVertex vertex = new DxsVertex(vid, new Vector3(x, y, z), jointID);
//See if we have a vertex color
if (xmlNode.HasChildNodes && xmlNode.LastChild.Name.Equals("color"))
{
XmlNode child = xmlNode.FirstChild;
byte r = byte.Parse(child.Attributes["r"].Value);
byte g = byte.Parse(child.Attributes["b"].Value);
byte b = byte.Parse(child.Attributes["g"].Value);
byte a = byte.Parse(child.Attributes["a"].Value);
vertex.VertexColor = new Color(r, g, b, a);
dxsPrim.VertexColorEnabled = true;
}
//Add master vertex to primitive
dxsPrim.MasterVertexList.Add(vertex);
}
/// <summary>
/// Parses a polygon node, which is a vertex list. Each vertex's
/// position is referenced by its vertex ID to the primitive's master list.
/// Texture coordinates and lightmap coordinates are picked up here,
/// as well as triangulation. Polys are added to a primitive grouped by
/// their material ID so they can be split up later into multiple meshes.
/// </summary>
/// <param name="xmlNode">Xml Poly node</param>
/// <param name="dxsPrim">Dxs Primitive this polygon belongs to</param>
private void ParsePolygon(XmlNode xmlNode, DxsPrimitive dxsPrim)
{
//Parse attributes
int mid = int.Parse(xmlNode.Attributes["mid"].Value);
int count = xmlNode.ChildNodes.Count;
DxsPoly poly = new DxsPoly(mid);
//Add the material to the primitive - if its a newly encountered material
if (materialList.ContainsKey(mid))
{
dxsPrim.AddMaterial(materialList[mid]);
}
//Now go through each vertex and parse it
for (int i = count - 1; i >= 0; i--)
{
// for(int i = 0; i < count; i++) {
XmlNode vertex = xmlNode.ChildNodes[i];
ParseVertex(vertex, dxsPrim, poly);
}
//Either triangulate the polygon, or simply add it if its already a triangle
if (count > 3)
{
TriangulatePolygon(dxsPrim, poly);
}
else
{
poly.ComputeFaceNormal();
dxsPrim.AddPoly(poly);
}
}
/// <summary>
/// Parse a xml primitive node. Result is attached to the specified
/// Dxs node.
/// </summary>
/// <param name="xmlNode">Xml Primitive Node</param>
/// <param name="dxsNode">Parent Dxs Node</param>
private void ParsePrimitive(XmlNode xmlNode, DxsNode dxsNode)
{
//Process attributes
String name = xmlNode.Attributes["name"].Value;
int groupID = -1; // int.Parse(xmlNode.Attributes["groupID"].Value);
int skeletonID = -1; // int.Parse(xmlNode.Attributes["skeletonID"].Value);
//Create a new DXS primitive
DxsPrimitive prim = new DxsPrimitive(name, groupID, skeletonID);
//Go through its children - first process the master vertex list,
//then the polygon list
foreach (XmlNode node in xmlNode.ChildNodes)
{
switch (node.Name)
{
case "vertices":
for (int i = 0; i < node.ChildNodes.Count; i++)
{
ParseMasterVertex(node.ChildNodes[i], prim);
}
break;
case "polygons":
for (int i = 0; i < node.ChildNodes.Count; i++)
{
ParsePolygon(node.ChildNodes[i], prim);
}
break;
}
}
dxsNode.AddChild(prim);
}
/// <summary>
/// Uses the first vertex in a polygon as a pivot to triangulate the polygon,
/// which get added to the dxs primitive.
/// </summary>
/// <param name="dxsPrim">Dxs Primitive the poly belongs to</param>
/// <param name="dxsPoly">Dxs Poly to be triangulated</param>
private void TriangulatePolygon(DxsPrimitive dxsPrim, DxsPoly dxsPoly)
{
DxsVertex[] vertices = dxsPoly.Vertices.ToArray();
DxsVertex v0 = vertices[0];
//Use the first vertex as a pivot and create triangles.
for (int v = 1; v < vertices.Length - 1; v++)
{
DxsPoly poly = new DxsPoly(dxsPoly.MaterialID);
poly.Vertices.Add(v0);
poly.Vertices.Add(vertices[v]);
poly.Vertices.Add(vertices[v + 1]);
poly.ComputeFaceNormal();
dxsPrim.AddPoly(poly);
}
}
