# Interface definition for thorn NullSurf
implements: NullSurf

INHERITS: ADMBase grid CoordBase ML_BSSN Driver

CCTK_POINTER FUNCTION                     \
    VarDataPtrI                           \
        (CCTK_POINTER_TO_CONST IN cctkGH, \
         CCTK_INT IN map,                 \
         CCTK_INT IN reflevel,            \
         CCTK_INT IN component,           \
         CCTK_INT IN timelevel,           \
         CCTK_INT IN varindex)
USES FUNCTION VarDataPtrI


public:
REAL photon_coord TYPE=array DIM=2 SIZE=photons_per_surface,nb_surfaces DISTRIB=constant
{
    pos_x,
    # stored only to send zeroes to interpolator
    pos_y,
    pos_z,
    mom_x,
    mom_z
}

REAL photon_rhs TYPE=array DIM=3 SIZE=photons_per_surface,nb_surfaces,4 DISTRIB=constant
{
    pos_x_rhs,
    pos_z_rhs,
    mom_x_rhs,
    mom_z_rhs
}

INT evol_next_step TYPE=scalar
INT surfaces_active TYPE=scalar
REAL origin_proper_time TYPE=scalar
REAL origin_proper_time_rhs TYPE=array DIM=1 SIZE=4