private static void ParseFromFile(ResourceFile file, UnsafeBufferWriter <Vertex> verticesBuffer, UnsafeBufferWriter <int> indicesBuffer)
{
using var stream = file.GetStream();
using var obj = ObjParser.ParseUnsafe(stream);
var hasUV = !obj.UVIndices.IsEmpty;
using var uvIndicesBuf = hasUV ? UnsafeRawArray <int> .Empty : new UnsafeRawArray <int>(obj.PositionIndices.Length, true);
var uvs = hasUV ? obj.UVs : stackalloc Vector2[1] {
Vector2.Zero
};
var uvIndices = hasUV ? obj.UVIndices : uvIndicesBuf.AsSpan();
var hasNormal = !obj.NormalIndices.IsEmpty;
if (hasNormal == false)
{
using var normalsBuf = new UnsafeBufferWriter <Vector3>();
var positions = obj.Positions;
var posNormalIndices = obj.PositionIndices;
var normals = MeshOperations.RecalculateNormal(positions, posNormalIndices, normalsBuf);
MeshOperations.CreateInterleavedVertices(positions, posNormalIndices, normals, posNormalIndices, uvs, uvIndices, verticesBuffer, indicesBuffer);
}
else
{
MeshOperations.CreateInterleavedVertices(obj.Positions, obj.PositionIndices, obj.Normals, obj.NormalIndices, uvs, uvIndices, verticesBuffer, indicesBuffer);
}
}
public static (Vertex[] vertices, int[] indices) CreateInterleavedVertices(
ReadOnlySpan <Vector3> positions, ReadOnlySpan <int> positionIndices,
ReadOnlySpan <Vector3> normals, ReadOnlySpan <int> normalIndices,
ReadOnlySpan <Vector2> uvs, ReadOnlySpan <int> uvIndices)
{
using var verticesBuffer = new UnsafeBufferWriter <Vertex>();
using var indicesBuffer = new UnsafeBufferWriter <int>();
var(vertices, indices) = CreateInterleavedVertices(positions, positionIndices, normals, normalIndices, uvs, uvIndices, verticesBuffer, indicesBuffer);
return(vertices.ToArray(), indices.ToArray());
}
private static async UniTask Build(StateObject state, Model3D model, Model3DLoadMeshDelegate load)
{
var(file, ct) = state;
var screen = model.GetValidScreen();
ct.ThrowIfCancellationRequested();
await UniTask.SwitchToThreadPool();
ct.ThrowIfCancellationRequested();
using var verticesBuffer = new UnsafeBufferWriter <Vertex>();
using var indicesBuffer = new UnsafeBufferWriter <int>();
ParseFromFile(file, verticesBuffer, indicesBuffer);
await screen.TimingPoints.Update.Next(ct);
load.Invoke(verticesBuffer.WrittenSpan, indicesBuffer.WrittenSpan);
}
