/// <summary>
/// Read a primitive object from a file
/// </summary>
/// <param name="source">The files contents as a byte array</param>
/// <param name="address">The starting address of the primitive</param>
/// <param name="indexAttribs">How the indices of the loops are structured</param>
public static Poly Read(byte[] source, ref uint address, IndexAttributes indexAttribs)
{
PushBigEndian(true);
PolyType type = (PolyType)source[address];
ushort vtxCount = source.ToUInt16(address + 1);
// checking the attributes
bool hasFlag(IndexAttributes attrib) => indexAttribs.HasFlag(attrib);
// position always exists
bool hasCol = hasFlag(IndexAttributes.HasColor);
bool hasNrm = hasFlag(IndexAttributes.HasNormal);
bool hasUV = hasFlag(IndexAttributes.HasUV);
//whether any of the indices use 16 bits instead of 8
bool shortPos = hasFlag(IndexAttributes.Position16BitIndex);
bool shortCol = hasFlag(IndexAttributes.Color16BitIndex);
bool shortNrm = hasFlag(IndexAttributes.Normal16BitIndex);
bool shortUV = hasFlag(IndexAttributes.UV16BitIndex);
address += 3;
List <Corner> corners = new();
for (ushort i = 0; i < vtxCount; i++)
{
Corner l = new();
// reading position, which should always exist
if (shortPos)
{
l.PositionIndex = source.ToUInt16(address);
address += 2;
}
else
{
l.PositionIndex = source[address];
address++;
}
// reading normals
if (hasNrm)
{
if (shortNrm)
{
l.NormalIndex = source.ToUInt16(address);
address += 2;
}
else
{
l.NormalIndex = source[address];
address++;
}
}
// reading colors
if (hasCol)
{
if (shortCol)
{
l.Color0Index = source.ToUInt16(address);
address += 2;
}
else
{
l.Color0Index = source[address];
address++;
}
}
// reading uvs
if (hasUV)
{
if (shortUV)
{
l.UV0Index = source.ToUInt16(address);
address += 2;
}
else
{
l.UV0Index = source[address];
address++;
}
}
corners.Add(l);
}
PopEndian();
return(new Poly(type, corners.ToArray()));
}
/// <summary>
/// Write the contents
/// </summary>
/// <param name="writer">The output stream</param>
/// <param name="indexAttribs">How the indices of the loops are structured</param>
public void Write(EndianWriter writer, IndexAttributes indexAttribs)
{
writer.PushBigEndian(true);
writer.Write((byte)Type);
writer.Write((ushort)Corners.Length);
// checking the attributes
bool hasFlag(IndexAttributes attrib) => indexAttribs.HasFlag(attrib);
// position always exists
bool hasCol = hasFlag(IndexAttributes.HasColor);
bool hasNrm = hasFlag(IndexAttributes.HasNormal);
bool hasUV = hasFlag(IndexAttributes.HasUV);
bool shortPos = hasFlag(IndexAttributes.Position16BitIndex);
bool shortCol = hasFlag(IndexAttributes.Color16BitIndex);
bool shortNrm = hasFlag(IndexAttributes.Normal16BitIndex);
bool shortUV = hasFlag(IndexAttributes.UV16BitIndex);
foreach (Corner v in Corners)
{
// Position should always exist
if (shortPos)
{
writer.Write(v.PositionIndex);
}
else
{
writer.Write((byte)v.PositionIndex);
}
if (hasNrm)
{
if (shortNrm)
{
writer.Write(v.NormalIndex);
}
else
{
writer.Write((byte)v.NormalIndex);
}
}
if (hasCol)
{
if (shortCol)
{
writer.Write(v.Color0Index);
}
else
{
writer.Write((byte)v.Color0Index);
}
}
if (hasUV)
{
if (shortUV)
{
writer.Write(v.UV0Index);
}
else
{
writer.Write((byte)v.UV0Index);
}
}
}
writer.PopEndian();
}