code: public FloatBuffer get3x3(int index, FloatBuffer buffer) {
          MemUtil.INSTANCE.put3x3(this, index, buffer);
          return buffer;
      }
docs: Store this matrix as an equivalent 3x3 matrix in column-major order into the supplied {@link FloatBuffer} starting at the specified
  absolute buffer position/index.
  <p>
  This method will not increment the position of the given FloatBuffer.
  
  @param index
  the absolute position into the FloatBuffer
  @param buffer
  will receive the values of this matrix in column-major order
  @return the passed in buffer