BufferUtils ensureLargeEnough problem retaining existing content

Troubleshooting SDK
1

Hi,

While in the process of trying to create a dynamic mesh, one that grows the number of mesh vertices, I have run into a problem with the underlying buffers.

When I use ‘ensureLargeEnough’ to expand the buffer the original content of the buffer is lost
I think this is probably a problem of the underlying direct ShortBuffer, the line in ensureLargeEnough newVerts.put(buffer); is not doing anything.

Can someone please give me a sanity check that this is happening?

The test case is:

package tsb;

import java.nio.ShortBuffer;

import com.jme3.util.BufferUtils;

public class TestShortBuffer 
{
	public static void main(String[] args) 
	{
		short[] asi = {1, 1, 2, 3, 5, 8, 13};
		ShortBuffer buffer = BufferUtils.createShortBuffer(asi);
		buffer = BufferUtils.ensureLargeEnough(buffer, asi.length+3);
		
		buffer.position(asi.length);
		buffer.put((short)21);
		buffer.put((short)34);
		buffer.put((short)55);
		
		for (int iIndex = 0; iIndex<asi.length; ++iIndex)
		{
			if (asi[iIndex]==buffer.get(iIndex)) continue;
			System.out.println(String.format("buffer content different %d %d", asi[iIndex], buffer.get(iIndex)));
			return;
		}
		
		System.out.println("buffer content same");
		return;
	}
}

The system output is “buffer content different 1 0”

Thanks for the help

Martin