kill some old 16 bit column indices

Change-Id: Ie1c3f3b11ed216b53f3fd385614f6fcb2c38220c
we need to create the buffer

Somehow this only crashes when I use gdb.

Change-Id: Ic18ffa3af931b80a7241e8fe711753db03da166e
avoid division by zero that happens to me in some cases

Change-Id: Ifc80462e7826e7d717dc553f50dd00f2b771bf15
remove unnecessary whitespaces

Change-Id: I4d93c0149aaf90e2477c1382aa51f8f08c967626
set the color for the picking

Change-Id: If7b902b16626384440241d88937161cf327e14d5
add method for creating framebuffer objects to OpenGLHelper

Change-Id: I08bd2e58ee98a68accae256fcbcc288a8c56ae0b
use FBO for the picking

Change-Id: Ibab6daa1f76300d159ccd4cfbca061c8d8c1951f
forgot to release the OpenGL resources

Change-Id: I2baefbe611f9ed28defc46ca3af332d13b32c561