public static Envelope ReadEnvelope(ChunkReader reader)
{
var env = new Envelope(); // allocate the Envelope structure
env.Index = reader.ReadVariableLengthIndex(); // index
EnvelopeKey lastKey = null;
while (reader.BytesLeft > 0)
{
// process subchunks as they're encountered
var id = reader.ReadID<EnvelopeType>();
var sz = reader.ReadUInt16();
sz += (ushort)(sz & 1);
using (var subChunkReader = reader.GetSubChunk(sz))
{
switch (id)
{
case EnvelopeType.ID_TYPE:
{
env.Type = subChunkReader.ReadUInt16();
break;
}
case EnvelopeType.ID_NAME:
{
env.Name = subChunkReader.ReadString();
break;
}
case EnvelopeType.ID_PRE:
{
env.PreBehavior = (EvalType)subChunkReader.ReadUInt16();
break;
}
case EnvelopeType.ID_POST:
{
env.PostBehavior = (EvalType)subChunkReader.ReadUInt16();
break;
}
case EnvelopeType.ID_KEY:
{
lastKey = new EnvelopeKey(
subChunkReader.ReadSingle(), // time
subChunkReader.ReadSingle() // value
);
env.Keys.Add(lastKey);
//TODO: not sort all the time
env.Keys.Sort((Comparison<EnvelopeKey>)delegate(EnvelopeKey k1, EnvelopeKey k2)
{
return k1.Time > k2.Time ? 1 : k1.Time < k2.Time ? -1 : 0;
});
break;
}
case EnvelopeType.ID_SPAN:
{
if (lastKey == null) // We should've encountered an ID_KEY before an ID_SPAN
throw new Exception("Key not defined"); //TODO: make proper exception class
lastKey.Shape = subChunkReader.ReadID<KeyShape>();
switch (lastKey.Shape)
{
case KeyShape.ID_TCB:
{
lastKey.Tension = subChunkReader.ReadSingle();
lastKey.Continuity = subChunkReader.ReadSingle();
lastKey.Bias = subChunkReader.ReadSingle();
break;
}
case KeyShape.ID_BEZI:
case KeyShape.ID_HERM:
case KeyShape.ID_BEZ2:
{
Array.Clear(lastKey.param, 0, lastKey.param.Length);
int i = 0;
while (i < 4 && subChunkReader.BytesLeft > 0)
{
lastKey.param[i] = subChunkReader.ReadSingle();
i++;
}
break;
}
case KeyShape.ID_LINE:
break;
default:
Console.WriteLine("Unknown envelope span shape type " + reader.GetIDString((uint)lastKey.Shape));
break;
}
break;
}
case EnvelopeType.ID_CHAN:
{
var plug = new LightwavePlugin();
plug.name = subChunkReader.ReadString();
plug.flags = subChunkReader.ReadUInt16();
plug.data = subChunkReader.ReadBytes((uint)reader.BytesLeft);
env.ChannelFilters.Add(plug);
break;
}
default:
Console.WriteLine("Unknown envelope type " + reader.GetIDString((uint)id));
break;
}
}
}
return env;
}
//======================================================================
// AddTextureVelocity()
//
// Add a triple of envelopes to simulate the old texture velocity
// parameters.
//======================================================================
static uint AddTextureVelocity(float[] pos, float[] vel, List<Envelope> elist)
{
Envelope env = null;
for (var i = 0; i < 3; i++)
{
env = new Envelope();
var key0 = new EnvelopeKey(0, // time
pos[i]); // value
var key1 = new EnvelopeKey(1, // time
pos[i] + vel[i] * 30.0f); // value
key0.Shape = key1.Shape = KeyShape.ID_LINE;
env.Index = (uint)(elist.Count + 1); // Q: shouldn't this be + 0?
env.Type = 0x0301 + i;
env.Name = "Position." + i;
env.Keys.Add(key0);
env.Keys.Add(key1);
env.PreBehavior = EvalType.BEH_LINEAR;
env.PostBehavior = EvalType.BEH_LINEAR;
elist.Add(env);
}
return env.Index - 2; // Q: why the -2?
}