RFF_FLATSPRITES = 1<<0
RFF_MODELS = 1<<1
RFF_SLOPE3DFLOORS = 1<<2
RFF_TILTPITCH = 1<<3
RFF_ROLLSPRITES = 1<<4
RFF_UNCLIPPEDTEX = 1<<5
RFF_MATSHADER = 1<<6
RFF_POSTSHADER = 1<<7
RFF_BRIGHTMAP = 1<<8
RFF_COLORMAP = 1<<9
RFF_POLYGONAL = 1<<10
RFF_TRUECOLOR = 1<<11
RFF_VOXELS = 1<<12