#define FL_FLY (1<<0) /* Changes the SV_Movestep() behavior to not need to be on ground */
#define FL_SWIM (1<<1) /* Changes the SV_Movestep() behavior to not need to be on ground (but stay in water) */
#define FL_CONVEYOR (1<<2)
#define FL_CLIENT (1<<3)
#define FL_INWATER (1<<4)
#define FL_MONSTER (1<<5)
#define FL_GODMODE (1<<6)
#define FL_NOTARGET (1<<7)
#define FL_SKIPLOCALHOST (1<<8) /* Don't send entity to local host, it's predicting this entity itself */
#define FL_ONGROUND (1<<9) /* At rest / on the ground */
#define FL_PARTIALGROUND (1<<10) /* not all corners are valid */
#define FL_WATERJUMP (1<<11) /* player jumping out of water */
#define FL_FROZEN (1<<12) /* Player is frozen for 3rd person camera */
#define FL_FAKECLIENT (1<<13) /* JAC: fake client, simulated server side; don't send network messages to them */
#define FL_DUCKING (1<<14) /* Player flag -- Player is fully crouched */
#define FL_FLOAT (1<<15) /* Apply floating force to this entity when in water */
#define FL_GRAPHED (1<<16) /* worldgraph has this ent listed as something that blocks a connection */
#define FL_IMMUNE_WATER (1<<17)
#define FL_IMMUNE_SLIME (1<<18)
#define FL_IMMUNE_LAVA (1<<19)
#define FL_PROXY (1<<20) /* This is a spectator proxy */
#define FL_ALWAYSTHINK (1<<21) /* Brush model flag -- call think every frame regardless of nextthink - ltime (for constantly changing velocity/path) */
#define FL_BASEVELOCITY (1<<22) /* Base velocity has been applied this frame (used to convert base velocity into momentum) */
#define FL_MONSTERCLIP (1<<23) /* Only collide in with monsters who have FL_MONSTERCLIP set */
#define FL_ONTRAIN (1<<24) /* Player is _controlling_ a train, so movement commands should be ignored on client during prediction. */
#define FL_WORLDBRUSH (1<<25) /* Not moveable/removeable brush entity (really part of the world, but represented as an entity for transparency or something) */
#define FL_SPECTATOR (1<<26) /* This client is a spectator, don't run touch functions, etc. */
#define FL_CUSTOMENTITY (1<<29) /* This is a custom entity */
#define FL_KILLME (1<<30) /* This entity is marked for death -- This allows the engine to kill ents at the appropriate time */
#define FL_DORMANT (1<<31) /* Entity is dormant, no updates to client */
#define SOLID_NOT 0 /* no interaction with other objects */
#define SOLID_TRIGGER 1 /* touch on edge, but not blocking */
#define SOLID_BBOX 2 /* touch on edge, block */
#define SOLID_SLIDEBOX 3 /* touch on edge, but not an onground */