/* See if there is a target in range */
BOOL aiChooseTarget(BASE_OBJECT *psObj, BASE_OBJECT **ppsTarget, int weapon_slot, BOOL bUpdateTarget, UWORD *targetOrigin)
{
BASE_OBJECT *psTarget = NULL;
DROID *psCommander;
SDWORD curTargetWeight=-1;
UWORD tmpOrigin = ORIGIN_UNKNOWN;
if (targetOrigin)
{
*targetOrigin = ORIGIN_UNKNOWN;
}
/* Get the sensor range */
switch (psObj->type)
{
case OBJ_DROID:
if (((DROID *)psObj)->asWeaps[weapon_slot].nStat == 0)
{
return false;
}
if (((DROID *)psObj)->asWeaps[0].nStat == 0 &&
((DROID *)psObj)->droidType != DROID_SENSOR)
{
// Can't attack without a weapon
return false;
}
break;
case OBJ_STRUCTURE:
if (((STRUCTURE *)psObj)->numWeaps == 0 || ((STRUCTURE *)psObj)->asWeaps[0].nStat == 0)
{
// Can't attack without a weapon
return false;
}
break;
default:
break;
}
/* See if there is a something in range */
if (psObj->type == OBJ_DROID)
{
BASE_OBJECT *psCurrTarget = ((DROID *)psObj)->psActionTarget[0];
/* find a new target */
int newTargetWeight = aiBestNearestTarget((DROID *)psObj, &psTarget, weapon_slot, NULL);
/* Calculate weight of the current target if updating; but take care not to target
* ourselves... */
if (bUpdateTarget && psCurrTarget != psObj)
{
curTargetWeight = targetAttackWeight(psCurrTarget, psObj, weapon_slot);
}
if (newTargetWeight >= 0 // found a new target
&& (!bUpdateTarget // choosing a new target, don't care if current one is better
|| curTargetWeight <= 0 // attacker had no valid target, use new one
|| newTargetWeight > curTargetWeight + OLD_TARGET_THRESHOLD) // updating and new target is better
&& validTarget(psObj, psTarget, weapon_slot)
&& (aiDroidHasRange((DROID *)psObj, psTarget, weapon_slot) || (secondaryGetState((DROID *)psObj, DSO_HALTTYPE) != DSS_HALT_HOLD)))
{
ASSERT(!isDead(psTarget), "aiChooseTarget: Droid found a dead target!");
*ppsTarget = psTarget;
return true;
}
}
else if (psObj->type == OBJ_STRUCTURE)
{
WEAPON_STATS *psWStats = NULL;
int tarDist, longRange = 0;
BOOL bCommanderBlock = false;
ASSERT(((STRUCTURE *)psObj)->asWeaps[weapon_slot].nStat > 0, "no weapons on structure");
psWStats = ((STRUCTURE *)psObj)->asWeaps[weapon_slot].nStat + asWeaponStats;
longRange = proj_GetLongRange(psWStats);
// see if there is a target from the command droids
psTarget = NULL;
psCommander = cmdDroidGetDesignator(psObj->player);
if (!proj_Direct(psWStats) && (psCommander != NULL) &&
aiStructHasRange((STRUCTURE *)psObj, (BASE_OBJECT *)psCommander, weapon_slot))
{
// there is a commander that can fire designate for this structure
// set bCommanderBlock so that the structure does not fire until the commander
// has a target - (slow firing weapons will not be ready to fire otherwise).
bCommanderBlock = true;
// I do believe this will never happen, check for yourself :-)
debug(LOG_NEVER,"Commander %d is good enough for fire designation", psCommander->id);
if (psCommander->action == DACTION_ATTACK
&& psCommander->psActionTarget[0] != NULL
&& !aiObjectIsProbablyDoomed(psCommander->psActionTarget[0]))
{
// the commander has a target to fire on
if (aiStructHasRange((STRUCTURE *)psObj, psCommander->psActionTarget[0], weapon_slot))
{
// target in range - fire on it
tmpOrigin = ORIGIN_COMMANDER;
psTarget = psCommander->psActionTarget[0];
}
else
{
// target out of range - release the commander block
bCommanderBlock = false;
}
}
}
// indirect fire structures use sensor towers first
tarDist = longRange * longRange;
if (psTarget == NULL && !bCommanderBlock && !proj_Direct(psWStats))
{
psTarget = aiSearchSensorTargets(psObj, weapon_slot, psWStats, &tmpOrigin);
}
if (psTarget == NULL && !bCommanderBlock)
{
BASE_OBJECT *psCurr;
gridStartIterate(psObj->pos.x, psObj->pos.y, PREVIOUS_DEFAULT_GRID_SEARCH_RADIUS);
psCurr = gridIterate();
while (psCurr != NULL)
{
/* Check that it is a valid target */
if (psCurr->type != OBJ_FEATURE && !aiObjectIsProbablyDoomed(psCurr) && aiStructHasRange((STRUCTURE *)psObj, psCurr, weapon_slot)
&& !aiCheckAlliances(psCurr->player, psObj->player)
&& validTarget(psObj, psCurr, weapon_slot) && psCurr->visible[psObj->player])
{
// See if in sensor range and visible
int distSq = objPosDiffSq(psCurr->pos, psObj->pos);
if (distSq < tarDist
|| (psTarget && psTarget->type == OBJ_STRUCTURE && ((STRUCTURE *)psTarget)->status != SS_BUILT)
|| (psTarget && aiObjIsWall(psTarget) && !aiObjIsWall(psCurr)))
{
tmpOrigin = ORIGIN_VISUAL;
psTarget = psCurr;
tarDist = distSq;
}
}
psCurr = gridIterate();
}
}
if (psTarget)
{
ASSERT(!psTarget->died, "aiChooseTarget: Structure found a dead target!");
if (targetOrigin)
{
*targetOrigin = tmpOrigin;
}
*ppsTarget = psTarget;
return true;
}
}
return false;
}
/* See if there is a target in range */
bool aiChooseTarget(BASE_OBJECT *psObj, BASE_OBJECT **ppsTarget, int weapon_slot, bool bUpdateTarget, TARGET_ORIGIN *targetOrigin)
{
BASE_OBJECT *psTarget = NULL;
DROID *psCommander;
SDWORD curTargetWeight = -1;
TARGET_ORIGIN tmpOrigin = ORIGIN_UNKNOWN;
if (targetOrigin)
{
*targetOrigin = ORIGIN_UNKNOWN;
}
switch (psObj->type)
{
case OBJ_DROID:
if (((DROID *)psObj)->asWeaps[weapon_slot].nStat == 0)
{
return false;
}
if (((DROID *)psObj)->asWeaps[0].nStat == 0 &&
((DROID *)psObj)->droidType != DROID_SENSOR)
{
return false; // Can't target without a weapon or sensor
}
break;
case OBJ_STRUCTURE:
if (((STRUCTURE *)psObj)->numWeaps == 0 || ((STRUCTURE *)psObj)->asWeaps[0].nStat == 0)
{
// Can't attack without a weapon
return false;
}
break;
default:
break;
}
/* See if there is a something in range */
if (psObj->type == OBJ_DROID)
{
BASE_OBJECT *psCurrTarget = ((DROID *)psObj)->psActionTarget[0];
/* find a new target */
int newTargetWeight = aiBestNearestTarget((DROID *)psObj, &psTarget, weapon_slot);
/* Calculate weight of the current target if updating; but take care not to target
* ourselves... */
if (bUpdateTarget && psCurrTarget != psObj)
{
curTargetWeight = targetAttackWeight(psCurrTarget, psObj, weapon_slot);
}
if (newTargetWeight >= 0 // found a new target
&& (!bUpdateTarget // choosing a new target, don't care if current one is better
|| curTargetWeight <= 0 // attacker had no valid target, use new one
|| newTargetWeight > curTargetWeight + OLD_TARGET_THRESHOLD) // updating and new target is better
&& validTarget(psObj, psTarget, weapon_slot)
&& aiDroidHasRange((DROID *)psObj, psTarget, weapon_slot))
{
ASSERT(!isDead(psTarget), "Droid found a dead target!");
*ppsTarget = psTarget;
return true;
}
}
else if (psObj->type == OBJ_STRUCTURE)
{
WEAPON_STATS *psWStats = NULL;
bool bCommanderBlock = false;
ASSERT(((STRUCTURE *)psObj)->asWeaps[weapon_slot].nStat > 0, "no weapons on structure");
psWStats = ((STRUCTURE *)psObj)->asWeaps[weapon_slot].nStat + asWeaponStats;
int longRange = proj_GetLongRange(psWStats, psObj->player);
// see if there is a target from the command droids
psTarget = NULL;
psCommander = cmdDroidGetDesignator(psObj->player);
if (!proj_Direct(psWStats) && (psCommander != NULL) &&
aiStructHasRange((STRUCTURE *)psObj, (BASE_OBJECT *)psCommander, weapon_slot))
{
// there is a commander that can fire designate for this structure
// set bCommanderBlock so that the structure does not fire until the commander
// has a target - (slow firing weapons will not be ready to fire otherwise).
bCommanderBlock = true;
// I do believe this will never happen, check for yourself :-)
debug(LOG_NEVER, "Commander %d is good enough for fire designation", psCommander->id);
if (psCommander->action == DACTION_ATTACK
&& psCommander->psActionTarget[0] != NULL
&& !psCommander->psActionTarget[0]->died)
{
// the commander has a target to fire on
if (aiStructHasRange((STRUCTURE *)psObj, psCommander->psActionTarget[0], weapon_slot))
{
// target in range - fire on it
tmpOrigin = ORIGIN_COMMANDER;
psTarget = psCommander->psActionTarget[0];
}
else
{
// target out of range - release the commander block
bCommanderBlock = false;
}
}
}
// indirect fire structures use sensor towers first
if (psTarget == NULL && !bCommanderBlock && !proj_Direct(psWStats))
{
psTarget = aiSearchSensorTargets(psObj, weapon_slot, psWStats, &tmpOrigin);
}
if (psTarget == NULL && !bCommanderBlock)
{
int targetValue = -1;
int tarDist = INT32_MAX;
int srange = longRange;
if (!proj_Direct(psWStats) && srange > objSensorRange(psObj))
{
// search radius of indirect weapons limited by their sight, unless they use
// external sensors to provide fire designation
srange = objSensorRange(psObj);
}
static GridList gridList; // static to avoid allocations.
gridList = gridStartIterate(psObj->pos.x, psObj->pos.y, srange);
for (GridIterator gi = gridList.begin(); gi != gridList.end(); ++gi)
{
BASE_OBJECT *psCurr = *gi;
/* Check that it is a valid target */
if (psCurr->type != OBJ_FEATURE && !psCurr->died
&& !aiCheckAlliances(psCurr->player, psObj->player)
&& validTarget(psObj, psCurr, weapon_slot) && psCurr->visible[psObj->player] == UBYTE_MAX
&& aiStructHasRange((STRUCTURE *)psObj, psCurr, weapon_slot))
{
int newTargetValue = targetAttackWeight(psCurr, psObj, weapon_slot);
// See if in sensor range and visible
int distSq = objPosDiffSq(psCurr->pos, psObj->pos);
if (newTargetValue < targetValue || (newTargetValue == targetValue && distSq >= tarDist))
{
continue;
}
tmpOrigin = ORIGIN_VISUAL;
psTarget = psCurr;
tarDist = distSq;
targetValue = newTargetValue;
}
}
}
if (psTarget)
{
ASSERT(!psTarget->died, "Structure found a dead target!");
if (targetOrigin)
{
*targetOrigin = tmpOrigin;
}
*ppsTarget = psTarget;
return true;
}
}
return false;
}
