Question

say if I have a big ShortBuffer with only 5 relevant items starting at position 0, and a small buffer with less capacity than the big buffer…
How would I ‘put’ the 5 values from the big buffer into the small buffer without getting a buffer overflow or having to manually index all of them?

currently throwing a buffer overflow exception with this:

indexBuffer.position(0);
subMeshes.get(subMeshIndex).indexBuffer.position(0);
subMeshes.get(subMeshIndex).indexBuffer.put(indexBuffer);

edit:
also please note that I’ll need to change the data from the large buffer afterwards so shared memory options like duplicate etc. are off the table

Answer 1

If I am understanding your needs correctly, the easiest thing to do would be to set a limit on the larger buffer. When you do a bulk put it will only transfer up to limit items. You can do this by:

indexBuffer.position(0);
indexBuffer.limit(5); // <-- limit to 5 temporarily
subMeshes.get(subMeshIndex).indexBuffer.position(0);
subMeshes.get(subMeshIndex).indexBuffer.put(indexBuffer);
indexBuffer.limit( indexBuffer.capacity() );