public void Optimise(NitroFile bca)
{
uint numBones = bca.Read16(0x00);
uint numFrames = bca.Read16(0x02);
BCAOffsetData offs = new BCAOffsetData
{
scaleOffset = bca.Read32(0x08),
rotOffset = bca.Read32(0x0c),
posOffset = bca.Read32(0x10),
animOffset = bca.Read32(0x14)
};
//Pass 1: The constant value pass
if (numFrames > 1)
{
for (uint i = 0; i < numBones; ++i)
{
for (uint j = 0; j < 9; ++j)
{
if (bca.Read8(offs.animOffset + 0x24 * i + 4 * j + 1) == 0)
{
continue;
}
uint dataOffset, unitSize;
offs.GetDataOffsetAndSize(j / 3, out dataOffset, out unitSize);
bool interped = bca.Read8(offs.animOffset + 0x24 * i + 4 * j + 0) != 0;
uint firstValID = bca.Read16(offs.animOffset + 0x24 * i + 4 * j + 2);
uint numVals = interped ?
numFrames / 2 + 1 :
numFrames;
uint[] vals = new uint[numVals];
for (uint k = 0; k < numVals; ++k)
{
vals[k] = bca.ReadVar(dataOffset + (firstValID + k) * unitSize, unitSize);
}
if (!Array.Exists(vals, x => x != vals[0])) //They're all the same.
{
uint addr = dataOffset + (firstValID + numVals) * unitSize;
BackSpace(bca, addr, (numVals - 1) * unitSize, ref offs);
bca.Write16(offs.animOffset + 0x24 * i + 4 * j + 0, 0x0000);
continue;
}
if (interped)
{
continue;
}
//Pass 2: The interpolation pass
bool shouldInterp = true;
int[] valInts;
if (unitSize == 2)
{
valInts = Array.ConvertAll(vals, x => x >= 0x8000 ? (int)(x | 0xffff0000) : (int)x);
}
else
{
valInts = Array.ConvertAll(vals, x => (int)x);
}
for (int k = 0; k < numVals - 2; k += 2)
{
if (Math.Abs(valInts[k] - 2 * valInts[k + 1] + valInts[k + 2]) > 1)
{
shouldInterp = false;
}
}
if (!shouldInterp)
{
continue;
}
for (uint k = 0; k < numVals; k += 2)
{
bca.WriteVar(dataOffset + (firstValID + k / 2) * unitSize, unitSize,
bca.ReadVar(dataOffset + (firstValID + k) * unitSize, unitSize));
}
if (numVals % 2 == 0) //can't interpolate on last frame even if that frame is odd
{
bca.WriteVar(dataOffset + (firstValID + numVals / 2) * unitSize, unitSize,
bca.ReadVar(dataOffset + (firstValID + numVals - 1) * unitSize, unitSize));
}
bca.Write8(offs.animOffset + 0x24 * i + 4 * j + 0, 1);
BackSpace(bca, dataOffset + (firstValID + numVals) * unitSize,
(numVals - 1) / 2 * unitSize, ref offs);
}
}
}
//Pass 3: The share equal data pass.
for (uint trID = 0; trID < 3; ++trID)
{
uint dataOffset, unitSize;
offs.GetDataOffsetAndSize(trID, out dataOffset, out unitSize);
BCAEntryToSort[] bcaEntries = new BCAEntryToSort[3 * numBones];
for (uint i = 0; i < numBones; ++i)
{
for (uint j = 0; j < 3; ++j)
{
bool constant = bca.Read8(offs.animOffset + 0x24 * i + 4 * (3 * trID + j) + 1) == 0;
bool interped = bca.Read8(offs.animOffset + 0x24 * i + 4 * (3 * trID + j) + 0) != 0;
uint firstValID = bca.Read16(offs.animOffset + 0x24 * i + 4 * (3 * trID + j) + 2);
uint numVals = constant ? 1 : interped ?
numFrames / 2 + 1 :
numFrames;
bcaEntries[3 * i + j].boneID = i;
bcaEntries[3 * i + j].axisID = j;
bcaEntries[3 * i + j].data = new uint[numVals];
for (uint k = 0; k < numVals; ++k)
{
bcaEntries[3 * i + j].data[k] =
bca.ReadVar(dataOffset + (firstValID + k) * unitSize, unitSize);
}
}
}
BCAEntryToSort[][] sortedEnts = bcaEntries.GroupBy(x => x.data, new UintArrEqualityComparer()).
Select(g => g.ToArray()).
ToArray();
foreach (BCAEntryToSort[] entArr in sortedEnts)
{
uint boneID = entArr[0].boneID;
uint axisID = entArr[0].axisID;
for (int i = 1; i < entArr.Length; ++i) //Using the 1st for reference; skip it
{
bool constant = bca.Read8(offs.animOffset + 0x24 * entArr[i].boneID +
4 * (3 * trID + entArr[i].axisID) + 1) == 0;
bool interped = bca.Read8(offs.animOffset + 0x24 * entArr[i].boneID +
4 * (3 * trID + entArr[i].axisID) + 0) != 0;
uint firstValID = bca.Read16(offs.animOffset + 0x24 * entArr[i].boneID +
4 * (3 * trID + entArr[i].axisID) + 2);
uint numVals = constant ? 1 : interped ?
numFrames / 2 + 1 :
numFrames;
uint sameValID = bca.Read16(offs.animOffset + 0x24 * boneID +
4 * (3 * trID + axisID) + 2);
if (firstValID != sameValID) //Avoid deleting entries when they are already shared
{
bca.Write16(offs.animOffset + 0x24 * entArr[i].boneID +
4 * (3 * trID + entArr[i].axisID) + 2, (ushort)sameValID);
BackSpace(bca, dataOffset + (firstValID + numVals) * unitSize,
numVals * unitSize, ref offs);
}
}
}
}
if ((offs.posOffset - offs.rotOffset) % 4 != 0)
{
BackSpace(bca, offs.posOffset, 0xfffffffe, ref offs, true);
}
}