public static Clip ReadClip(ChunkReader reader)
{
// index
var index = reader.ReadUInt32();
// first subchunk header
var type = reader.ReadID<ClipType>();
var subchunk_size = reader.ReadUInt16();
subchunk_size += (ushort)(subchunk_size & 1);
Clip clip = null;
using (var subChunkReader = reader.GetSubChunk(subchunk_size))
{
switch (type)
{
case ClipType.ID_STIL:
{
var tmp_clip = new ClipStill(index);
tmp_clip.Name = subChunkReader.ReadString();
clip = tmp_clip;
break;
}
case ClipType.ID_ISEQ:
{
var tmp_clip = new ClipSequence(index);
tmp_clip.Digits = subChunkReader.ReadUInt8();
tmp_clip.Flags = subChunkReader.ReadUInt8();
tmp_clip.Offset = subChunkReader.ReadSInt16();
subChunkReader.ReadUInt16(); // Legacy Cruft: Nothing to see here
tmp_clip.Start = subChunkReader.ReadSInt16();
tmp_clip.End = subChunkReader.ReadSInt16();
tmp_clip.Prefix = subChunkReader.ReadString();
tmp_clip.Suffix = subChunkReader.ReadString();
clip = tmp_clip;
break;
}
case ClipType.ID_ANIM:
{
var tmp_clip = new ClipAnim(index);
tmp_clip.Name = subChunkReader.ReadString();
tmp_clip.Server = subChunkReader.ReadString();
tmp_clip.Data = subChunkReader.ReadBytes((uint)subChunkReader.BytesLeft);
clip = tmp_clip;
break;
}
case ClipType.ID_XREF:
{
var tmp_clip = new ClipCloned(index);
tmp_clip.clip_reference_index = subChunkReader.ReadUInt32();
tmp_clip.Name = subChunkReader.ReadString();
clip = tmp_clip;
break;
}
case ClipType.ID_STCC:
{
var tmp_clip = new ClipColorCycle(index);
tmp_clip.lo = subChunkReader.ReadSInt16();
tmp_clip.hi = subChunkReader.ReadSInt16();
tmp_clip.Name = subChunkReader.ReadString();
clip = tmp_clip;
break;
}
default:
throw new Exception("Unknown Clip type"); // TODO: create proper exception class for this ...
}
}
while (reader.BytesLeft > 0)
{
// process subchunks as they're encountered
var id = reader.ReadID<ClipDataType>();
subchunk_size = reader.ReadUInt16();
subchunk_size += (ushort)(subchunk_size & 1);
using (var subChunkReader = reader.GetSubChunk(subchunk_size))
{
switch (id)
{
//case ClipDataType.ID_CLRS: // Color Space RGB - CLRS { flags[U2], colorspace[U2], filename[FNAM0] }
//case ClipDataType.ID_CLRA: // Color Space Alpha - CLRA { flags[U2], colorspace[U2], filename[FNAM0] }
//case ClipDataType.ID_FILT: // Image Filtering - FILT { flags[U2] }
//case ClipDataType.ID_DITH: // Image Dithering - DITH { flags[U2] }
// Contrast - CONT { contrast-delta[FP4], envelope[VX] }
case ClipDataType.ID_CONT: { clip.Contrast.value = subChunkReader.ReadSingle(); clip.Contrast.envelope_index = subChunkReader.ReadVariableLengthIndex(); break; }
// Brightness - BRIT { brightness-delta[FP4], envelope[VX] }
case ClipDataType.ID_BRIT: { clip.Brightness.value = subChunkReader.ReadSingle(); clip.Brightness.envelope_index = subChunkReader.ReadVariableLengthIndex(); break; }
// Saturation - SATR { saturation-delta[FP4], envelope[VX] }
case ClipDataType.ID_SATR: { clip.Saturation.value = subChunkReader.ReadSingle(); clip.Saturation.envelope_index = subChunkReader.ReadVariableLengthIndex(); break; }
// Hue - HUE { hue-rotation[FP4], envelope[VX] }
case ClipDataType.ID_HUE: { clip.Hue.value = subChunkReader.ReadSingle(); clip.Hue.envelope_index = subChunkReader.ReadVariableLengthIndex(); break; }
// Gamma Correction - GAMM { gamma[F4], envelope[VX] }
case ClipDataType.ID_GAMM: { clip.Gamma.value = subChunkReader.ReadSingle(); clip.Gamma.envelope_index = subChunkReader.ReadVariableLengthIndex(); break; }
// Negative - NEGA { enable[U2] }
case ClipDataType.ID_NEGA: { clip.Negative = subChunkReader.ReadUInt16() != 0; break; }
// Time - TIME { start-time[FP4], duration[FP4], frame-rate[FP4] }
case ClipDataType.ID_TIME:
{
clip.StartTime = subChunkReader.ReadSingle();
clip.Duration = subChunkReader.ReadSingle();
clip.FrameRate = subChunkReader.ReadSingle();
break;
}
// Plug-in Image Filters - IFLT { server-name[S0], flags[U2], data[...] }
case ClipDataType.ID_IFLT:
// Plug-in Pixel Filters - PFLT { server-name[S0], flags[U2], data[...] }
case ClipDataType.ID_PFLT:
{
var filt = new LightwavePlugin();
filt.name = subChunkReader.ReadString();
filt.flags = subChunkReader.ReadUInt16();
filt.data = subChunkReader.ReadBytes((uint)subChunkReader.BytesLeft);
if (id == ClipDataType.ID_IFLT)
clip.ImageFilters.Add(filt);
else
clip.PixelFilters.Add(filt);
break;
}
case ClipDataType.ID_FLAG: // not mentioned in documentation ...
var flags = subChunkReader.ReadUInt16(); // unknown what they mean ...
break;
default:
Console.WriteLine("Unknown clip type " + reader.GetIDString((uint)id));
break;
}
}
}
return clip;
}
static LightwaveObject ReadObject2(ChunkReader reader)
{
// allocate an object and a default layer
var newObject = new LightwaveObject();
var currentLayer = new Layer();
newObject.Layers.Add(currentLayer);
bool createdLayer = false;
uint pointOffset = 0;
uint polygonOffset = 0;
uint tagOffset = 0;
// process chunks as they're encountered
while (reader.BytesLeft > 0)
{
var id = reader.ReadID<ChunkType>();
var cksize = reader.ReadUInt32();
cksize += cksize & 1;
using (var subchunkReader = reader.GetSubChunk(cksize))
{
switch (id)
{
case ChunkType.ID_LAYR:
{
if (createdLayer)
{
currentLayer = new Layer();
newObject.Layers.Add(currentLayer);
}
createdLayer = true;
currentLayer.Index = subchunkReader.ReadUInt16();
currentLayer.Flags = subchunkReader.ReadUInt16();
currentLayer.pivot_x = subchunkReader.ReadSingle();
currentLayer.pivot_y = subchunkReader.ReadSingle();
currentLayer.pivot_z = subchunkReader.ReadSingle();
currentLayer.Name = subchunkReader.ReadString();
if (subchunkReader.BytesLeft > 2)
currentLayer.Parent = subchunkReader.ReadUInt16();
break;
}
case ChunkType.ID_PTAG:
{
ReadPolygonTags(subchunkReader, currentLayer.Polygons, polygonOffset, tagOffset);
break;
}
case ChunkType.ID_BBOX:
{
currentLayer.bbox_min_x = subchunkReader.ReadSingle();
currentLayer.bbox_min_y = subchunkReader.ReadSingle();
currentLayer.bbox_min_z = subchunkReader.ReadSingle();
currentLayer.bbox_max_x = subchunkReader.ReadSingle();
currentLayer.bbox_max_y = subchunkReader.ReadSingle();
currentLayer.bbox_max_z = subchunkReader.ReadSingle();
break;
}
case ChunkType.ID_PNTS:
{
pointOffset = (uint)currentLayer.Points.Count;
currentLayer.Points.AddRange(
ReadPoints(subchunkReader) // throws exception on failure
);
break;
}
case ChunkType.ID_POLS:
{
polygonOffset = (uint)currentLayer.Polygons.Count;
currentLayer.Polygons.AddRange(
ReadPolygons(subchunkReader, pointOffset) // throws exception on failure
);
break;
}
case ChunkType.ID_VMAP:
{
currentLayer.VertexMaps.Add(
VertexMap.ReadVertexMap(subchunkReader, false) // throws exception on failure
);
break;
}
case ChunkType.ID_VMAD:
{
currentLayer.VertexMaps.Add(
VertexMap.ReadVertexMap(subchunkReader, true) // throws exception on failure
);
break;
}
case ChunkType.ID_TAGS:
{
tagOffset = (uint)newObject.Tags.Count;
newObject.Tags.AddRange(
LightwaveObject.ReadTags(subchunkReader) // throws exception on failure
);
break;
}
case ChunkType.ID_ENVL:
{
newObject.Envelopes.Add(
Envelope.ReadEnvelope(subchunkReader) // throws exception on failure
);
break;
}
case ChunkType.ID_CLIP:
{
newObject.Clips.Add(
Clip.ReadClip(subchunkReader) // throws exception on failure
);
break;
}
case ChunkType.ID_SURF:
{
newObject.Surfaces.Add(
Surface.ReadSurface(subchunkReader) // throws exception on failure
);
break;
}
case ChunkType.ID_DESC: // Description Line - DESC { description-line[S0] }
case ChunkType.ID_TEXT: // Commentary Text - TEXT { comment[S0] }
case ChunkType.ID_ICON: // Thumbnail Icon Image - ICON { encoding[U2], width[U2], data[U1] * }
case ChunkType.ID_VMPA: // Vertex Map Parameter - VMPA { UV subdivision type[I4], sketch color[I4] }
break;
default:
Console.WriteLine("Unknown chunk type " + reader.GetIDString((uint)id));
break;
}
}
}
if (newObject.Tags.Count == 0)
throw new Exception("No tags found for this layer"); // TODO: create a proper exception class
uint layer_index = 0;
foreach (var layer in newObject.Layers)
{
layer.CalculateBoundingBox();
newObject.CalculatePolygonNormals(layer.Points, layer.Polygons);
newObject.ResolvePointPolygons(layer.Points, layer.Polygons);
newObject.ResolvePolygonSurfaces(layer.Polygons, newObject.Tags, newObject.Surfaces, layer_index);
newObject.CalculateVertexNormals(layer.Points, layer.Polygons);
newObject.ResolvePointVertexMaps(layer.Points, layer.VertexMaps);
newObject.ResolvePolygonVertexMaps(layer.Polygons, layer.VertexMaps);
layer_index++;
}
return newObject;
}
// Returns the contents of a LWOB
static LightwaveObject ReadObject5(ChunkReader reader)
{
// allocate an object and a default layer
var newObject = new LightwaveObject();
var currentLayer = new Layer();
newObject.Layers.Add(currentLayer);
uint pointOffset = 0;
uint polygonOffset = 0;
uint tagOffset = 0;
// process chunks as they're encountered
while (reader.BytesLeft > 0)
{
var id = reader.ReadID<ChunkType>();
var cksize = reader.ReadUInt32();
cksize += cksize & 1;
using (var subchunkReader = reader.GetSubChunk(cksize))
{
switch (id)
{
case ChunkType.ID_PNTS:
{
pointOffset = (uint)currentLayer.Points.Count;
currentLayer.Points.AddRange(
ReadPoints(subchunkReader) // throws exception on failure
);
break;
}
case ChunkType.ID_POLS:
{
polygonOffset = (uint)currentLayer.Polygons.Count;
currentLayer.Polygons.AddRange(
ReadPolygons5(subchunkReader, pointOffset) // throws exception on failure
);
break;
}
case ChunkType.ID_SRFS:
{
tagOffset = (uint)newObject.Tags.Count;
newObject.Tags.AddRange(
LightwaveObject.ReadTags(subchunkReader) // throws exception on failure
);
break;
}
case ChunkType.ID_SURF:
{
newObject.Surfaces.Add(
Surface.ReadSurface5(subchunkReader, newObject) // throws exception on failure
);
break;
}
default:
Console.WriteLine("Unknown chunk type " + reader.GetIDString((uint)id));
break;
}
}
}
if (newObject.Tags.Count == 0)
throw new Exception("No tags found for this layer"); // TODO: create a proper exception class
uint layer_index = 0;
foreach (var layer in newObject.Layers)
{
layer.CalculateBoundingBox();
newObject.CalculatePolygonNormals(layer.Points, layer.Polygons);
newObject.ResolvePointPolygons(layer.Points, layer.Polygons);
newObject.ResolvePolygonSurfaces(layer.Polygons, newObject.Tags, newObject.Surfaces, layer_index);
newObject.CalculateVertexNormals(layer.Points, layer.Polygons);
layer_index++;
}
return newObject;
}
public static LightwaveObject LoadObject(string filename)
{
// open the file
var contents = File.ReadAllBytes(filename);
using (var reader = new ChunkReader(contents))
{
// read the first 12 bytes
var id = reader.ReadID<HeaderID>();
var formsize = reader.ReadUInt32();
var type = reader.ReadID<ObjectType>();
if (id != HeaderID.ID_FORM) // is this a LW object?
return null;
using (var formReader = reader.GetSubChunk(formsize))
{
switch (type)
{
case ObjectType.ID_LWO2: return ReadObject2(formReader);
case ObjectType.ID_LWOB: return ReadObject5(formReader);
default:
Console.WriteLine("Unknown object type " + reader.GetIDString((uint)type));
return null;
}
}
}
}
