/// <summary>
/// Reads the index buffer data and converts it into a triangle list if necessary.
/// </summary>
/// <param name="reader">The mesh reader to use.</param>
/// <param name="part">The mesh part to read.</param>
/// <param name="resourceStream">A stream open on the resource data.</param>
/// <returns>The index buffer converted into a triangle list.</returns>
public static uint[] ReadIndices(MeshReader reader, Mesh.Part part, Stream resourceStream)
{
// Use index buffer 0
var indexBuffer = reader.IndexBuffers[0];
if (indexBuffer == null)
{
throw new InvalidOperationException("Index buffer 0 is null");
}
// Read the indexes
var indexStream = reader.OpenIndexBufferStream(indexBuffer, resourceStream);
indexStream.Position = part.FirstIndex;
switch (indexBuffer.Type)
{
case PrimitiveType.TriangleList:
return(indexStream.ReadIndices(part.IndexCount));
case PrimitiveType.TriangleStrip:
return(indexStream.ReadTriangleStrip(part.IndexCount));
default:
throw new InvalidOperationException("Unsupported index buffer type: " + indexBuffer.Type);
}
}
/// <summary>
/// Defines a part in the current mesh.
/// </summary>
/// <param name="materialIndex">Index of the material.</param>
/// <param name="firstIndex">The first index.</param>
/// <param name="indexCount">The index count.</param>
/// <param name="vertexCount">The vertex count.</param>
/// <exception cref="System.InvalidOperationException">Cannot define a part if no mesh is active</exception>
public void DefinePart(short materialIndex, ushort firstIndex, ushort indexCount, ushort vertexCount)
{
if (_currentMesh == null)
{
throw new InvalidOperationException("Cannot define a part if no mesh is active");
}
var part = new Mesh.Part
{
MaterialIndex = materialIndex,
Unknown2 = -1,
FirstIndex = firstIndex,
IndexCount = indexCount,
FirstSubPartIndex = (short)_currentMesh.Mesh.SubParts.Count,
SubPartCount = 1,
// TODO: Unknown values here
VertexCount = vertexCount,
};
// It doesn't seem like the game really ever uses subparts for
// most models, but define one anyway
var subPart = new Mesh.SubPart
{
FirstIndex = firstIndex,
IndexCount = indexCount,
PartIndex = (short)_currentMesh.Mesh.Parts.Count,
VertexCount = vertexCount,
};
_currentMesh.Mesh.Parts.Add(part);
_currentMesh.Mesh.SubParts.Add(subPart);
}
/// <summary>
/// Defines a part in the current mesh.
/// </summary>
/// <param name="materialIndex">Index of the material.</param>
/// <param name="firstIndex">The first index.</param>
/// <param name="indexCount">The index count.</param>
/// <param name="vertexCount">The vertex count.</param>
/// <exception cref="System.InvalidOperationException">Cannot define a part if no mesh is active</exception>
public void DefinePart(short materialIndex, ushort firstIndex, ushort indexCount, ushort vertexCount)
{
if (_currentMesh == null)
throw new InvalidOperationException("Cannot define a part if no mesh is active");
var part = new Mesh.Part
{
MaterialIndex = materialIndex,
Unknown2 = -1,
FirstIndex = firstIndex,
IndexCount = indexCount,
FirstSubPartIndex = (short)_currentMesh.Mesh.SubParts.Count,
SubPartCount = 1,
// TODO: Unknown values here
VertexCount = vertexCount,
};
// It doesn't seem like the game really ever uses subparts for
// most models, but define one anyway
var subPart = new Mesh.SubPart
{
FirstIndex = firstIndex,
IndexCount = indexCount,
PartIndex = (short)_currentMesh.Mesh.Parts.Count,
VertexCount = vertexCount,
};
_currentMesh.Mesh.Parts.Add(part);
_currentMesh.Mesh.SubParts.Add(subPart);
}
