public static W3dMotionChannelTimeCodedData Parse(BinaryReader reader, ushort numTimeCodes, W3dAnimationChannelType channelType)
{
var keyframes = new ushort[numTimeCodes];
for (var i = 0; i < numTimeCodes; i++)
{
keyframes[i] = reader.ReadUInt16();
}
if (numTimeCodes % 2 != 0)
{
// Align to 4-byte boundary.
reader.ReadUInt16();
}
var data = new W3dAnimationChannelDatum[numTimeCodes];
for (var i = 0; i < numTimeCodes; i++)
{
data[i] = W3dAnimationChannelDatum.Parse(reader, channelType);
}
return(new W3dMotionChannelTimeCodedData
{
TimeCodes = keyframes,
Values = data
});
}
internal static W3dAnimationChannel Parse(BinaryReader reader, W3dParseContext context)
{
return(ParseChunk(reader, context, header =>
{
var startPosition = reader.BaseStream.Position;
var result = new W3dAnimationChannel
{
FirstFrame = reader.ReadUInt16(),
LastFrame = reader.ReadUInt16(),
VectorLength = reader.ReadUInt16(),
ChannelType = reader.ReadUInt16AsEnum <W3dAnimationChannelType>(),
Pivot = reader.ReadUInt16(),
Unknown = reader.ReadUInt16()
};
ValidateChannelDataSize(result.ChannelType, result.VectorLength);
var numElements = result.LastFrame - result.FirstFrame + 1;
var data = new W3dAnimationChannelDatum[numElements];
for (var i = 0; i < numElements; i++)
{
data[i] = W3dAnimationChannelDatum.Parse(reader, result.ChannelType);
}
result.Data = data;
result.NumPadBytes = (uint)(context.CurrentEndPosition - reader.BaseStream.Position);
reader.BaseStream.Seek((int)result.NumPadBytes, SeekOrigin.Current);
return result;
}));
}
public static W3dAnimationChannelDatum[] Decode(
W3dAdaptiveDeltaData data,
uint numFrames,
float scale)
{
var scaleFactor = 1.0f;
switch (data.BitCount)
{
// Do nothing for 4 bit deltas since they already map to [-16;16]
case W3dAdaptiveDeltaBitCount.FourBits:
break;
// When deltas are 8 bits large we need to scale them to the range [-16;16]
case W3dAdaptiveDeltaBitCount.EightBits:
scaleFactor = 1 / 16.0f;
break;
default:
throw new InvalidOperationException("Adaptive delta only supported 4 bit & 8 bit!");
}
var result = new W3dAnimationChannelDatum[numFrames];
result[0] = data.InitialDatum;
for (var i = 0; i < data.DeltaBlocks.Length; i++)
{
var deltaBlock = data.DeltaBlocks[i];
var blockIndex = deltaBlock.BlockIndex;
var blockScale = Table[blockIndex];
var deltaScale = blockScale * scale * scaleFactor;
var vectorIndex = deltaBlock.VectorIndex;
var deltas = deltaBlock.GetDeltas(data.BitCount);
for (var j = 0; j < deltas.Length; j++)
{
var idx = ((i / data.VectorLength) * 16) + j + 1;
if (idx >= numFrames)
{
break;
}
var value = result[idx - 1].GetValue(vectorIndex) + deltaScale * deltas[j];
result[idx] = result[idx].WithValue(value, vectorIndex);
idx++;
}
}
return(result);
}
internal static W3dTimeCodedDatum Parse(BinaryReader reader, W3dAnimationChannelType channelType)
{
var result = new W3dTimeCodedDatum();
result.TimeCode = reader.ReadUInt32();
// MSB is used to indicate a binary (non interpolated) movement
if ((result.TimeCode >> 31) == 1)
{
result.NonInterpolatedMovement = true;
// TODO: non-interpolated movement.
result.TimeCode &= ~(1 << 31);
}
result.Value = W3dAnimationChannelDatum.Parse(reader, channelType);
return(result);
}
internal static W3dAdaptiveDeltaData Parse(
BinaryReader reader,
uint numFrames,
W3dAnimationChannelType type,
int vectorLength,
W3dAdaptiveDeltaBitCount bitCount)
{
var count = (numFrames + 15) >> 4;
// First read all initial values
var result = new W3dAdaptiveDeltaData
{
BitCount = bitCount,
VectorLength = vectorLength,
InitialDatum = W3dAnimationChannelDatum.Parse(reader, type)
};
var numBits = (int)bitCount;
// Then read the interleaved delta blocks
var deltaBlocks = new W3dAdaptiveDeltaBlock[count * vectorLength];
for (var i = 0; i < count; i++)
{
for (var j = 0; j < vectorLength; j++)
{
deltaBlocks[(i * vectorLength) + j] = W3dAdaptiveDeltaBlock.Parse(
reader,
j,
numBits);
}
}
result.DeltaBlocks = deltaBlocks;
return(result);
}