Allocation mémoire des différents tampons

Bonjour
Le code source d'allocation mémoire des différents tampons sous Android est le suivant:

ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length * 4);
vbb.order(ByteOrder.nativeOrder());
mTamponSommets = vbb.asFloatBuffer();
mTamponSommets.put(vertices);
mTamponSommets.position(0);
ByteBuffer tbb = ByteBuffer.allocateDirect(texCoords.length * 4);
tbb.order(ByteOrder.nativeOrder());
mTamponTexCoords = tbb.asFloatBuffer();
mTamponTexCoords.put(texCoords);
mTamponTexCoords.position(0);
mTamponIndex = ByteBuffer.allocateDirect(indexFaces.length);
mTamponIndex.put(indexFaces);
mTamponIndex.position(0);