// world.h

typedef struct {
    vec3_t normal;
    float dist;
} plane_t;

typedef struct {
    qboolean allsolid;		// if true, plane is not valid
    qboolean startsolid;	// if true, the initial point was in a solid area
    qboolean inopen, inwater;
    float fraction;		// time completed, 1.0 = didn't hit anything
    vec3_t endpos;		// final position
    plane_t plane;		// surface normal at impact
    edict_t *ent;		// entity the surface is on
} trace_t;


#define	MOVE_NORMAL		0
#define	MOVE_NOMONSTERS	1
#define	MOVE_MISSILE	2


void SV_ClearWorld(void);
// called after the world model has been loaded, before linking any entities

void SV_UnlinkEdict(edict_t * ent);
// call before removing an entity, and before trying to move one,
// so it doesn't clip against itself
// flags ent->v.modified

void SV_LinkEdict(edict_t * ent, qboolean touch_triggers);
// Needs to be called any time an entity changes origin, mins, maxs, or solid
// flags ent->v.modified
// sets ent->v.absmin and ent->v.absmax
// if touchtriggers, calls prog functions for the intersected triggers

int SV_PointContents(vec3_t p);
// returns the CONTENTS_* value from the world at the given point.
// does not check any entities at all

edict_t *SV_TestEntityPosition(edict_t * ent);

trace_t SV_Move(vec3_t start, vec3_t mins, vec3_t maxs, vec3_t end,
		int type, edict_t * passedict);
// mins and maxs are reletive

// if the entire move stays in a solid volume, trace.allsolid will be set

// if the starting point is in a solid, it will be allowed to move out
// to an open area

// nomonsters is used for line of sight or edge testing, where mosnters
// shouldn't be considered solid objects

// passedict is explicitly excluded from clipping checks (normally NULL)