Added fast path for when delta is zero, which is common on some games.
Added fast path for when delta is zero, which is common on some games.

tianyutingxy/turbulenz_engine,turbulenz/turbulenz_engine,sanyaade-teachings/turbulenz_engine,tianyutingxy/turbulenz_engine,changemypath/turbulenz_engine,supriyantomaftuh/turbulenz_engine,supriyantomaftuh/turbulenz_engine,turbulenz/turbulenz_engine,tianyutingxy/turbulenz_engine,supriyantomaftuh/turbulenz_engine,changemypath/turbulenz_engine,changemypath/turbulenz_engine,turbulenz/turbulenz_engine,supriyantomaftuh/turbulenz_engine,tianyutingxy/turbulenz_engine,sanyaade-teachings/turbulenz_engine,tianyutingxy/turbulenz_engine,sanyaade-teachings/turbulenz_engine,sanyaade-teachings/turbulenz_engine,turbulenz/turbulenz_engine,sanyaade-teachings/turbulenz_engine,turbulenz/turbulenz_engine,changemypath/turbulenz_engine,changemypath/turbulenz_engine,supriyantomaftuh/turbulenz_engine