MC_ENGINE_IDX_CE0
case MC_ENGINE_IDX_CE0 ... MC_ENGINE_IDX_CE9:
*pinst = mc_engine_idx - MC_ENGINE_IDX_CE0;
#define MC_ENGINE_IDX_CE(x) (MC_ENGINE_IDX_CE0 + (x))
case MC_ENGINE_IDX_CE0 ... MC_ENGINE_IDX_CE19:
*pinst = mc_engine_idx - MC_ENGINE_IDX_CE0;