protected void SaveSection(int section)
{
// Clear the section in chunk if it is cleared in this snapshot
if (_palette[section] == null || _palette[section].Count == 0)
{
_chunk._palette[section]?.Clear();
_chunk._palette[section] = null;
_chunk._blockStates[section] = null;
return;
}
// It's possible the section has not been created in chunk
var oldCellSize = _chunk._blockStates[section] == null ? -1
: _chunk._blockStates[section].CellSize;
// Only update the palette when it is changed
if (_paletteChanged[section])
{
_chunk._palette[section]?.Clear();
_chunk._palette[section] = _palette[section].Clone();
}
var newCellSize = Math.Max(4, NumericUtility.GetRequiredBitLength(_palette[section].Count));
if ((newCellSize == oldCellSize) || (!CompactBlockBitsIfPossible && (newCellSize < oldCellSize)))
{
// Do not create new DynArray if the cellSize doesn't change to improve performance.
var dyn = _chunk._blockStates[section];
for (var i = 0; i < 4096; i++)
{
dyn[i] = _blocks[section][i];
}
}
else
{
// Create new DynArray when cellSize is changed
var dyn = DynBitArray.CreateEmpty(newCellSize, 4096);
for (var i = 0; i < 4096; i++)
{
// Because the assignment of dynArray[i] can be time-consuming,
// index(0) is skipped because DynBitArray.CreateEmpty is guaranteed to create a zero-filled array
if (_blocks[section][i] == 0)
{
continue;
}
dyn[i] = _blocks[section][i];
}
_chunk._blockStates[section]?.Clear();
_chunk._blockStates[section] = dyn;
}
}
public void NumericTest()
{
Assert.AreEqual(NumericUtility.GetRequiredBitLength(2), 1);
Assert.AreEqual(NumericUtility.GetRequiredBitLength(4), 2);
Assert.AreEqual(NumericUtility.GetRequiredBitLength(8), 3);
Assert.AreEqual(NumericUtility.GetRequiredBitLength(7), 3);
Assert.AreEqual(NumericUtility.GetRequiredBitLength(9), 4);
Assert.AreEqual(NumericUtility.GetLeastMultiplication(4096, 4096), 4096);
Assert.AreEqual(NumericUtility.GetLeastMultiplication(8192, 4096), 8192);
Assert.AreEqual(NumericUtility.GetLeastMultiplication(8191, 4096), 8192);
}
