public override async Task <CmodData> Read()
{
using var reader = new BufferedReader(_stream);
var materials = new List <Material>();
var meshes = new List <Mesh>();
while (true)
{
var token = await reader.TryReadToken().ConfigureAwait(false);
if (!token.HasValue)
{
break;
}
switch (token.Value)
{
case Token.Material:
materials.Add(await ReadMaterial(reader).ConfigureAwait(false));
break;
case Token.Mesh:
meshes.Add(await ReadMesh(reader, materials.Count).ConfigureAwait(false));
break;
default:
throw new CmodException("Unexpected token in cmod file");
}
}
if (materials.Count == 0)
{
throw new CmodException("No materials found");
}
if (meshes.Count == 0)
{
throw new CmodException("No meshes found");
}
return(new CmodData(materials, meshes));
}
private static async Task <IReadOnlyList <VertexAttribute> > ReadVertexDescription(BufferedReader reader)
{
if (await reader.ReadToken().ConfigureAwait(false) != Token.VertexDesc)
{
throw new CmodException("Expected vertex description");
}
var attributes = new List <VertexAttribute>();
while (true)
{
var token = await reader.ReadInt16().ConfigureAwait(false);
if (token == (short)Token.EndVertexDesc)
{
return(attributes);
}
var attribute = (AttributeType)token;
if (!Enum.IsDefined(attribute))
{
throw new CmodException("Unknown vertex attribute");
}
if (attributes.Any(a => a.AttributeType == attribute))
{
throw new CmodException("Duplicate vertex attribute");
}
var format = await reader.ReadAttributeFormat().ConfigureAwait(false);
if (!Enum.IsDefined(format))
{
throw new CmodException("Invalid attribute format");
}
attributes.Add(VertexAttribute.Create(attribute, format));
}
}
