Silences warnings when using -Wshift-overflow (GCC 6+). Found-by: James Almer <jamrial@gmail.com>
This module implements generic texture decompression from different families (DXTC, RGTC, BCn) and texture compression DXTC 1, 3, and 5. Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>