// Output : _buff.zippedDataBuffer, _buff.zippedDataLen
public void ReplaceChunksInPiece(List <IntVector4> chunkPosList, ProcToMergeChunkAtPos mergeChunkDataAtPos, IntVector4 piecePos)
{
ReadPieceDataToBuff(piecePos.x, piecePos.y, piecePos.z, piecePos.w);
_buff.Decompress(piecePos.x, piecePos.y, piecePos.z, piecePos.w);
List <IntVector4> sortedChunkPosList = chunkPosList.OrderBy(pos => VFFileUtil.ChunkPos2IndexInPiece(pos)).ToList();
byte[] chunkDataSet = _buff.unzippedDataBuffer;
int lenChunkDataSet = _buff.unzippedDataLen;
byte[] hollowData = null;
if (_buff.IsHollow())
{
hollowData = new byte[_buff.zippedDataLen];
Array.Copy(_buff.zippedDataBuffer, hollowData, _buff.zippedDataLen);
}
int idxChunkMax = VoxelTerrainConstants._ChunksPerPiece - 1;
int idxInPiece = 0;
List <byte[]> chunkDataList = new List <byte[]>();
byte[] chunkData = null;
int sumDataLen = 0;
int n = sortedChunkPosList.Count;
for (int i = 0; i < n; i++)
{
IntVector4 chunkPos = sortedChunkPosList[i];
int idxChunk = VFFileUtil.ChunkPos2IndexInPiece(chunkPos);
while (idxInPiece <= idxChunk)
{
if (_buff.IsHollow())
{
chunkDataList.Add(hollowData);
sumDataLen += hollowData.Length;
}
else
{
int ofsDataAddr = 4 * idxInPiece;
int vxDataAddr = (chunkDataSet[ofsDataAddr]) + (chunkDataSet[ofsDataAddr + 1] << 8) + (chunkDataSet[ofsDataAddr + 2] << 16) + (chunkDataSet[ofsDataAddr + 3] << 24);
int vxDataNextAddr = (idxInPiece < idxChunkMax) ? (chunkDataSet[ofsDataAddr + 4]) + (chunkDataSet[ofsDataAddr + 5] << 8) + (chunkDataSet[ofsDataAddr + 6] << 16) + (chunkDataSet[ofsDataAddr + 7] << 24)
: lenChunkDataSet;
int len = vxDataNextAddr - vxDataAddr;
chunkData = new byte[len];
Array.Copy(chunkDataSet, vxDataAddr, chunkData, 0, len);
chunkDataList.Add(chunkData);
sumDataLen += len;
}
idxInPiece++;
}
// merge chunk
sumDataLen -= chunkDataList[idxChunk].Length;
chunkDataList[idxChunk] = mergeChunkDataAtPos(chunkPos, chunkDataList[idxChunk]);
sumDataLen += chunkDataList[idxChunk].Length;
}
while (idxInPiece <= idxChunkMax)
{
if (_buff.IsHollow())
{
chunkDataList.Add(hollowData);
sumDataLen += hollowData.Length;
}
else
{
int ofsDataAddr = 4 * idxInPiece;
int vxDataAddr = (chunkDataSet[ofsDataAddr]) + (chunkDataSet[ofsDataAddr + 1] << 8) + (chunkDataSet[ofsDataAddr + 2] << 16) + (chunkDataSet[ofsDataAddr + 3] << 24);
int vxDataNextAddr = (idxInPiece < idxChunkMax) ? (chunkDataSet[ofsDataAddr + 4]) + (chunkDataSet[ofsDataAddr + 5] << 8) + (chunkDataSet[ofsDataAddr + 6] << 16) + (chunkDataSet[ofsDataAddr + 7] << 24)
: lenChunkDataSet;
int len = vxDataNextAddr - vxDataAddr;
chunkData = new byte[len];
Array.Copy(chunkDataSet, vxDataAddr, chunkData, 0, len);
chunkDataList.Add(chunkData);
sumDataLen += len;
}
idxInPiece++;
}
int ofsDataLen = 4 * VoxelTerrainConstants._ChunksPerPiece;
_buff.unzippedDataLen = ofsDataLen + sumDataLen;
byte[] pieceData = _buff.unzippedDataBuffer;
int ofs = ofsDataLen;
for (int i = 0; i < VoxelTerrainConstants._ChunksPerPiece; i++)
{
byte[] data = chunkDataList[i];
Array.Copy(data, 0, pieceData, ofs, data.Length);
pieceData[i * 4] = (byte)(ofs & 0xff);
pieceData[i * 4 + 1] = (byte)((ofs >> 8) & 0xff);
pieceData[i * 4 + 2] = (byte)((ofs >> 16) & 0xff);
pieceData[i * 4 + 3] = (byte)((ofs >> 24) & 0xff);
ofs += data.Length;
}
//Compress
_buff.zippedDataLen = LZ4.LZ4_compress(_buff.unzippedDataBuffer, _buff.zippedDataBuffer, _buff.unzippedDataLen);
}