public string GenerateSlab(SlabModel model)
{
if (!model.Assets.Any())
{
return(null);
}
try
{
using var data = new MemoryStream();
using var deflateStream = new GZipStream(data, CompressionLevel.Optimal);
using var binaryWrite = new BinaryWriter(deflateStream);
binaryWrite.Write(MagicNumber);
binaryWrite.Write((ushort)model.Version);
var orderedAssets = model.Assets.OrderBy(x => x.Id);
var groups = orderedAssets.GroupBy(x => x.Id);
binaryWrite.Write((ushort)groups.Count());
var firstAsset = model.Assets.First();
var unionMin = firstAsset.Bounds.Center - firstAsset.Bounds.Extents;
var unionMax = firstAsset.Bounds.Center + firstAsset.Bounds.Extents;
foreach (var g in groups)
{
var assetId = g.Key;
var layout = new Layout(assetId, (ushort)g.Count());
binaryWrite.Write(Layout.Write(layout));
}
foreach (var asset in orderedAssets)
{
binaryWrite.Write(AssetCopyData.Write(new AssetCopyData(asset.Bounds, asset.Rotation)));
var min = asset.Bounds.Center - asset.Bounds.Extents;
var max = asset.Bounds.Center + asset.Bounds.Extents;
unionMin.X = Math.Min(min.X, unionMin.X);
unionMin.Y = Math.Min(min.Y, unionMin.Y);
unionMin.Z = Math.Min(min.Z, unionMin.Z);
unionMax.X = Math.Max(max.X, unionMax.X);
unionMax.Y = Math.Max(max.Y, unionMax.Y);
unionMax.Z = Math.Max(max.Z, unionMax.Z);
}
var union = new Bounds(.5f * (unionMin + unionMax), .5f * (unionMax - unionMin));
binaryWrite.Write(Bounds.Write(union));
binaryWrite.Close();
deflateStream.Close();
data.Flush();
var buff = data.ToArray();
return($"```{Convert.ToBase64String(buff)}```");
}
catch
{
//TODO: proper logging
return(null);
}
}
public SlabModel ReadSlab(string data)
{
try
{
var b64Data = Convert.FromBase64String(data.Trim('`'));
using var stream = new MemoryStream(b64Data);
using var deflateStream = new GZipStream(stream, CompressionMode.Decompress);
using var memStream = new MemoryStream();
deflateStream.CopyTo(memStream);
memStream.Flush();
var buff = memStream.ToArray();
using var reader = new BinaryReader(new MemoryStream(buff));
unsafe
{
var slabModel = new SlabModel();
var check = reader.ReadUInt32();
if (check != MagicNumber)
{
return(null);
}
slabModel.Version = reader.ReadUInt16();
var layoutCnt = reader.ReadUInt16();
var layouts = new Layout[layoutCnt];
for (var i = 0; i < layoutCnt; i++)
{
layouts[i] = Layout.Read(reader.ReadBytes(sizeof(Layout)));
}
var lst = new List <AssetModel>();
foreach (var layout in layouts)
{
for (var i = 0; i < layout.AssetCount; i++)
{
var asset = AssetCopyData.Read(reader.ReadBytes(sizeof(AssetCopyData)));
lst.Add(new AssetModel
{
Id = layout.AssetId,
Bounds = asset.SelectionBounds,
Rotation = asset.Rotation
});
}
}
slabModel.Assets = lst;
return(slabModel);
}
}
catch
{
return(null);
}
}