// indicates if polygonbegin should be interpreted as 2d
// (clearscene sets this to false, renderscene sets this to true, drawpic
// also sets this to true)
// note that in FTEQW polygonbegin with 2 args is handled very differently,
// where the behavior is always 3D unless DRAWFLAG_2D is passed, but
// DRAWFLAG_2D conflicts with our DRAWFLAG_SCREEN.
// indicates if polygonbegin should be interpreted as 2d
// (clearscene sets this to false, renderscene sets this to true, drawpic
// also sets this to true)
// note that in FTEQW polygonbegin with 2 args is handled very differently,
// where the behavior is always 3D unless DRAWFLAG_2D is passed, but
// DRAWFLAG_2D conflicts with our DRAWFLAG_SCREEN.