/**
* @brief test if check is visible by from
* @param[in] team Living team members are always visible. If this is a negative
* number we inverse the team rules (see comments included). In combination with VT_NOFRUSTUM
* we can check whether there is any edict (that is no in our team) that can see @c check
* @param[in] from is from team @c team and must be a living actor
* @param[in] check The edict we want to get the visibility for
* @param[in] flags @c VT_NOFRUSTUM, ...
*/
bool G_Vis (const int team, const Edict* from, const Edict* check, const vischeckflags_t flags)
{
vec3_t eye;
/* if any of them isn't in use, then they're not visible */
if (!from->inuse || !check->inuse)
return false;
/* only actors and 2x2 units can see anything */
if (!G_IsLivingActor(from) && !G_IsActiveCamera(from))
return false;
/* living team members are always visible */
if (team >= 0 && check->getTeam() == team && !G_IsDead(check))
return true;
/* standard team rules */
if (team >= 0 && from->getTeam() != team)
return false;
/* inverse team rules */
if (team < 0 && check->getTeam() == -team)
return false;
/* check for same pos */
if (VectorCompare(from->pos, check->pos))
return true;
if (!G_IsVisibleOnBattlefield(check))
return false;
/* view distance check */
const int spotDist = G_VisCheckDist(from);
if (VectorDistSqr(from->origin, check->origin) > spotDist * spotDist)
return false;
/* view frustum check */
if (!(flags & VT_NOFRUSTUM) && !G_FrustumVis(from, check->origin))
return false;
/* get viewers eye height */
G_ActorGetEyeVector(from, eye);
/* line trace check */
switch (check->type) {
case ET_ACTOR:
case ET_ACTOR2x2:
return G_ActorVis(eye, from, check, false) > ACTOR_VIS_0;
case ET_ITEM:
case ET_CAMERA:
case ET_PARTICLE:
return !G_LineVis(eye, check->origin);
default:
return false;
}
}
/**
* @brief calculate how much check is "visible" from @c from
* @param[in] from The world coordinate to check from
* @param[in] ent The source edict of the check
* @param[in] check The edict to check how good (or if at all) it is visible
* @param[in] full Perform a full check in different directions. If this is
* @c false the actor is fully visible if one vis check returned @c true. With
* @c true this function can also return a value != 0.0 and != 1.0. Try to only
* use @c true if you really need the full check. Full checks are of course
* more expensive.
* @return a value between 0.0 and 1.0 which reflects the visibility from 0
* to 100 percent
* @note This call isn't cheap - try to do this only if you really need the
* visibility check or the statement whether one particular actor see another
* particular actor.
* @sa CL_ActorVis
*/
float G_ActorVis (const vec3_t from, const edict_t *ent, const edict_t *check, bool full)
{
vec3_t test, dir;
float delta;
int i, n;
const float distance = VectorDist(check->origin, ent->origin);
/* units that are very close are visible in the smoke */
if (distance > UNIT_SIZE * 1.5f) {
vec3_t eyeEnt;
edict_t *e = NULL;
G_ActorGetEyeVector(ent, eyeEnt);
while ((e = G_EdictsGetNext(e))) {
if (G_IsSmoke(e)) {
if (RayIntersectAABB(eyeEnt, check->absmin, e->absmin, e->absmax)
|| RayIntersectAABB(eyeEnt, check->absmax, e->absmin, e->absmax)) {
return ACTOR_VIS_0;
}
}
}
}
/* start on eye height */
VectorCopy(check->origin, test);
if (G_IsDead(check)) {
test[2] += PLAYER_DEAD;
delta = 0;
} else if (G_IsCrouched(check)) {
test[2] += PLAYER_CROUCH - 2;
delta = (PLAYER_CROUCH - PLAYER_MIN) / 2 - 2;
} else {
test[2] += PLAYER_STAND;
delta = (PLAYER_STAND - PLAYER_MIN) / 2 - 2;
}
/* side shifting -> better checks */
dir[0] = from[1] - check->origin[1];
dir[1] = check->origin[0] - from[0];
dir[2] = 0;
VectorNormalizeFast(dir);
VectorMA(test, -7, dir, test);
/* do 3 tests */
n = 0;
for (i = 0; i < 3; i++) {
if (!G_LineVis(from, test)) {
if (full)
n++;
else
return ACTOR_VIS_100;
}
/* look further down or stop */
if (!delta) {
if (n > 0)
return ACTOR_VIS_100;
else
return ACTOR_VIS_0;
}
VectorMA(test, 7, dir, test);
test[2] -= delta;
}
/* return factor */
switch (n) {
case 0:
return ACTOR_VIS_0;
case 1:
return ACTOR_VIS_10;
case 2:
return ACTOR_VIS_50;
default:
return ACTOR_VIS_100;
}
}
/**
* @brief calculate how much check is "visible" by @c ent
* @param[in] ent The source edict of the check
* @param[in] check The edict to check how good (or if at all) it is visible
* @param[in] full Perform a full check in different directions. If this is
* @c false the actor is fully visible if one vis check returned @c true. With
* @c true this function can also return a value != 0.0 and != 1.0. Try to only
* use @c true if you really need the full check. Full checks are of course
* more expensive.
* @return a value between 0.0 and 1.0 (one of the ACTOR_VIS_* constants) which
* reflects the visibility from 0 to 100 percent
* @note This call isn't cheap - try to do this only if you really need the
* visibility check or the statement whether one particular actor see another
* particular actor.
* @sa CL_ActorVis
*/
float G_ActorVis (const Edict* ent, const Edict* check, bool full)
{
vec3_t eyeEnt;
G_ActorGetEyeVector(ent, eyeEnt);
if (G_SmokeVis(eyeEnt, check))
return ACTOR_VIS_0;
vec3_t test, dir;
float delta;
/* start on eye height */
VectorCopy(check->origin, test);
if (G_IsDead(check)) {
test[2] += PLAYER_DEAD;
delta = 0;
} else if (G_IsCrouched(check)) {
test[2] += PLAYER_CROUCH - 2;
delta = (PLAYER_CROUCH - PLAYER_MIN) / 2 - 2;
} else {
test[2] += PLAYER_STAND;
delta = (PLAYER_STAND - PLAYER_MIN) / 2 - 2;
}
/* side shifting -> better checks */
dir[0] = eyeEnt[1] - check->origin[1];
dir[1] = check->origin[0] - eyeEnt[0];
dir[2] = 0;
VectorNormalizeFast(dir);
VectorMA(test, -7, dir, test);
/* do 3 tests */
int n = 0;
for (int i = 0; i < 3; i++) {
if (!G_LineVis(eyeEnt, test)) {
if (full)
n++;
else
return ACTOR_VIS_100;
}
/* look further down or stop */
if (!delta) {
if (n > 0)
return ACTOR_VIS_100;
else
return ACTOR_VIS_0;
}
VectorMA(test, 7, dir, test);
test[2] -= delta;
}
/* return factor */
switch (n) {
case 0:
return ACTOR_VIS_0;
case 1:
return ACTOR_VIS_10;
case 2:
return ACTOR_VIS_50;
default:
return ACTOR_VIS_100;
}
}
