GLuint primitive:2;
GLuint do_twoside_color:1;
GLuint do_flat_shading:1;
GLuint frontface_ccw:1;
GLuint do_point_sprite:1;
GLuint linear_color:1; /**< linear interp vs. perspective interp */
GLuint primitive:2;
GLuint do_twoside_color:1;
GLuint do_flat_shading:1;
GLuint frontface_ccw:1;
GLuint do_point_sprite:1;
GLuint linear_color:1; /**< linear interp vs. perspective interp */