/// <summary>
/// Write to G1M span using just SectionsRoot
/// </summary>
/// <returns></returns>
public Span <byte> WriteFromRoot()
{
var sectionHeaderSize = SizeHelper.SizeOf <ResourceSectionHeader>();
var size = SizeHelper.SizeOf <ModelHeader>() + sectionHeaderSize + SectionRoot.Sections.Sum(x => x.Length);
var buffer = new Span <byte>(new byte[size]);
var modelSectionHeader = Section;
modelSectionHeader.Size = size;
MemoryMarshal.Write(buffer, ref modelSectionHeader);
var offset = sectionHeaderSize;
var modelHeader = new ModelHeader
{
HeaderSize = sectionHeaderSize + SizeHelper.SizeOf <ModelHeader>(),
Reserved = 0,
SectionCount = SectionRoot.Sections.Count
};
MemoryMarshal.Write(buffer.Slice(offset), ref modelHeader);
offset = modelHeader.HeaderSize;
foreach (var data in SectionRoot.Sections)
{
data.Span.CopyTo(buffer.Slice(offset));
offset += data.Length;
}
return(buffer);
}
/// <summary>
/// Loads all transforms from the <paramref name="ctx"/> that pass the <paramref name="isTransformTagAccepted"/> test,
/// applies them sequentially to the <paramref name="srcView"/>, and returns the resulting data view.
/// If there are no transforms in <paramref name="ctx"/> that are accepted, returns the original <paramref name="srcView"/>.
/// The difference from the <c>Create</c> method above is that:
/// - it doesn't wrap the results into a loader, just returns the last transform in the chain.
/// - it accepts <see cref="IDataView"/> as input, not necessarily a loader.
/// - it throws away the tag information.
/// - it doesn't throw if the context is not representing a <see cref="LegacyCompositeDataLoader"/>: in this case it's assumed that no transforms
/// meet the test, and the <paramref name="srcView"/> is returned.
/// Essentially, this is a helper method for the LoadTransform class.
/// </summary>
public static IDataView LoadSelectedTransforms(ModelLoadContext ctx, IDataView srcView, IHostEnvironment env, Func<string, bool> isTransformTagAccepted)
{
Contracts.CheckValue(env, nameof(env));
var h = env.Register(RegistrationName);
h.CheckValue(ctx, nameof(ctx));
h.Check(ctx.Reader.BaseStream.Position == ctx.FpMin + ctx.Header.FpModel);
var ver = GetVersionInfo();
if (ctx.Header.ModelSignature != ver.ModelSignature)
{
using (var ch = h.Start("ModelCheck"))
{
ch.Info("The data model doesn't contain transforms.");
}
return srcView;
}
ModelHeader.CheckVersionInfo(ref ctx.Header, ver);
h.CheckValue(srcView, nameof(srcView));
h.CheckValue(isTransformTagAccepted, nameof(isTransformTagAccepted));
// *** Binary format ***
// int: sizeof(Float)
// int: number of transforms
// foreach transform: (starting from version VersionAddedTags)
// string: tag
// string: args string
int cbFloat = ctx.Reader.ReadInt32();
h.CheckDecode(cbFloat == sizeof(float));
int cxf = ctx.Reader.ReadInt32();
h.CheckDecode(cxf >= 0);
bool hasTags = ctx.Header.ModelVerReadable >= VersionAddedTags;
var curView = srcView;
for (int i = 0; i < cxf; i++)
{
string tag = "";
if (hasTags)
{
tag = ctx.LoadNonEmptyString();
ctx.LoadStringOrNull(); // ignore the args string
}
if (!isTransformTagAccepted(tag))
continue;
IDataTransform xf;
ctx.LoadModel<IDataTransform, SignatureLoadDataTransform>(env, out xf,
string.Format(TransformDirTemplate, i), curView);
curView = xf;
}
return curView;
}
public void Parse(Stream input)
{
using (BinaryReader reader = new BinaryReader(input)) {
Header = reader.Read <ModelHeader>();
if (Header.MaterialOffset > 0)
{
input.Position = Header.MaterialOffset;
Materials = reader.ReadArray <ulong>(Header.MaterialCount);
}
}
}
public Model(ModelHeader header, BinaryReader reader)
{
this.Header = header;
var start = reader.BaseStream.Position;
reader.BaseStream.Position = start + header.MeshIndex;
Meshes = new Mesh[header.MeshCount];
for (var i = 0; i < header.MeshCount; i++)
{
var modelHeader = reader.ReadStruct <MeshHeader>();
Meshes[i] = new Mesh(modelHeader, reader);
}
}
public override void WriteModelStart(ModelHeader header)
{
this.WriteStringValue(header.ModelName);
this.WriteIntegerValue(header.PropertyCount);
}