remove unused function

Change-Id: I990e53f55093affa0da1878d1cdd46f6b1c6a99c
fix indentation

Change-Id: Ia61988f94a2cce9aefe1b48159a1bf1884be70f2
don't include the win version of svsys directly

Change-Id: I21f9443ad847ab07c3e25e6004d2133148db7f03
make it possible to select the OpenGL rendering on windows

Change-Id: Id60b8121a890e6d1f46bd671549ac681f42b7660
no check before delete and move to intializer list

Change-Id: Ib6e50f863db1a64dc42ed4313a009abe4932ce3f