public void AddMesh(ModelMeshPartContent mmpc)
{
// build a look-up table for channel in to channel out
VertexElement[] ves = mmpc.GetVertexDeclaration();
int[] dstOffset = new int[ves.Length];
ReadConversion[] converter = new ReadConversion[ves.Length];
int stride = 0;
for (int i = 0, n = ves.Length; i != n; ++i)
{
dstOffset[i] = MatchComponent(ves[i], out converter[i], ref stride);
}
object colorValue;
if (!mmpc.Material.OpaqueData.TryGetValue("Diffuse", out colorValue) ||
colorValue == null || !(colorValue is Color))
{
materialColor_ = Color.White;
}
else
{
materialColor_ = (Color)colorValue;
}
// walk the primitives and build triangle data
for (int i = 0, n = mmpc.PrimitiveCount; i != n; ++i)
{
// walk vertex declaration
for (int q = 0, m = ves.Length; q != m; ++q)
{
if (dstOffset[q] >= 0)
{
int ix, bytePos;
ix = indexBufferData_[0 + i * 3 + mmpc.StartIndex];
bytePos = ix * stride + mmpc.BaseVertex + ves[q].Offset;
v0[dstOffset[q]] = converter[q](vertexBufferData_, bytePos);
ix = indexBufferData_[1 + i * 3 + mmpc.StartIndex];
bytePos = ix * stride + mmpc.BaseVertex + ves[q].Offset;
v1[dstOffset[q]] = converter[q](vertexBufferData_, bytePos);
ix = indexBufferData_[2 + i * 3 + mmpc.StartIndex];
bytePos = ix * stride + mmpc.BaseVertex + ves[q].Offset;
v2[dstOffset[q]] = converter[q](vertexBufferData_, bytePos);
}
}
// add triangle
AddTriangle();
}
}
int MatchComponent(VertexElement ve, out ReadConversion converter, ref int stride)
{
if (ve.Stream != 0)
{
throw new System.FormatException("MultiPieceBuilder cannot use input meshes with multiple streams.");
}
int end = ve.Offset + GetFormatSize(ve.VertexElementFormat);
if (end > stride)
{
stride = end;
}
converter = null;
for (int i = 0, n = dataChannels.Count; i != n; ++i)
{
if (dataChannels[i].VertexElementUsage == ve.VertexElementUsage &&
dataChannels[i].UsageIndex == ve.UsageIndex)
{
switch (ve.VertexElementFormat)
{
case VertexElementFormat.Color:
switch (dataChannels[i].VertexElementFormat)
{
case VertexElementFormat.Color:
converter = new ReadConversion(ReadColorFromColor);
return(i);
case VertexElementFormat.Vector3:
converter = new ReadConversion(ReadColorFromVector3);
return(1);
case VertexElementFormat.Vector4:
converter = new ReadConversion(ReadColorFromVector4);
return(i);
}
break;
case VertexElementFormat.Vector2:
if (dataChannels[i].VertexElementFormat == VertexElementFormat.Vector2)
{
converter = new ReadConversion(ReadVector2FromVector2);
return(i);
}
break;
case VertexElementFormat.Vector3:
if (dataChannels[i].VertexElementFormat == VertexElementFormat.Vector3)
{
converter = new ReadConversion(ReadVector3FromVector3);
return(i);
}
break;
}
throw new System.InvalidOperationException(
String.Format("Can't map {0} to {1} for vertex element format.",
ve.VertexElementFormat, dataChannels[i].VertexElementFormat));
}
}
return(-1);
}
