Avoid using possibly undefined GL symbols.
Avoid using possibly undefined GL symbols.

renzodenardi/Pangolin,mp3guy/Pangolin,stevenlovegrove/Pangolin,wxdzju/Pangolin,tschmidt23/Pangolin,pinglin/Pangolin,wxdzju/Pangolin,arpg/Pangolin,arpg/Pangolin,pinglin/Pangolin,visigoth/Pangolin,tschmidt23/Pangolin,stevenlovegrove/Pangolin,janjachnik/Pangolin,mp3guy/Pangolin,mp3guy/Pangolin,tschmidt23/Pangolin,randi120/Pangolin,renzodenardi/Pangolin,visigoth/Pangolin,randi120/Pangolin,stevenlovegrove/Pangolin,janjachnik/Pangolin