private ShortBuffer GetIdxBuffer(int size)
{
var roundedSize = Math.Max(MinBufferSize, Utils.NextPowerOfTwo(size));
var idx = MaxBufferSizeLog2 - Utils.Log2Int(roundedSize);
var buffer = (ShortBuffer)null;
if (freeIdxBuffers[idx].Count == 0)
{
buffer = ByteBuffer.AllocateDirect(sizeof(short) * roundedSize).Order(ByteOrder.NativeOrder()).AsShortBuffer();
}
else
{
var lastIdx = freeIdxBuffers[idx].Count - 1;
buffer = freeIdxBuffers[idx][lastIdx];
freeIdxBuffers[idx].RemoveAt(lastIdx);
}
usedIdxBuffers[idx].Add(buffer);
buffer.Position(0);
return(buffer);
}