// Try and find a new locking point
void hud_lock_get_new_lock_pos(object *target_objp)
{
ship *target_shipp=NULL;
int lock_in_range=0;
float best_lock_dot=-1.0f, lock_dot=-1.0f;
ship_subsys *ss;
vec3d subsys_world_pos, vec_to_lock;
ship_weapon *swp;
weapon_info *wip;
if ( target_objp->type == OBJ_SHIP ) {
target_shipp = &Ships[target_objp->instance];
}
swp = &Player_ship->weapons;
wip = &Weapon_info[swp->secondary_bank_weapons[swp->current_secondary_bank]];
// if a large ship, lock to pos closest to center and within range
if ( (target_shipp) && (Ship_info[target_shipp->ship_info_index].is_big_or_huge()) &&
!(wip->wi_flags[Weapon::Info_Flags::Homing_javelin]) ) {
// check all the subsystems and the center of the ship
// assume best lock pos is the center of the ship
lock_world_pos = target_objp->pos;
Player->locking_on_center=1;
Player->locking_subsys=NULL;
Player->locking_subsys_parent=-1;
lock_in_range = hud_lock_world_pos_in_range(&lock_world_pos, &vec_to_lock);
vm_vec_normalize(&vec_to_lock);
if ( lock_in_range ) {
best_lock_dot=vm_vec_dot(&Player_obj->orient.vec.fvec, &vec_to_lock);
}
// take center if reasonable dot
if ( best_lock_dot > 0.95 ) {
return;
}
// iterate through subsystems to see if we can get a better choice
ss = GET_FIRST(&target_shipp->subsys_list);
while ( ss != END_OF_LIST( &target_shipp->subsys_list ) ) {
// get world pos of subsystem
get_subsystem_world_pos(target_objp, ss, &subsys_world_pos);
if ( hud_lock_world_pos_in_range(&subsys_world_pos, &vec_to_lock) ) {
vm_vec_normalize(&vec_to_lock);
lock_dot=vm_vec_dot(&Player_obj->orient.vec.fvec, &vec_to_lock);
if ( lock_dot > best_lock_dot ) {
best_lock_dot=lock_dot;
Player->locking_on_center=0;
Player->locking_subsys=ss;
Player->locking_subsys_parent=Player_ai->target_objnum;
lock_world_pos = subsys_world_pos;
}
}
ss = GET_NEXT( ss );
}
} else if ( (target_shipp) && (wip->wi_flags[Weapon::Info_Flags::Homing_javelin])) {
Player->locking_subsys = ship_get_closest_subsys_in_sight(target_shipp, SUBSYSTEM_ENGINE, &Player_obj->pos);
if (Player->locking_subsys != NULL) {
get_subsystem_world_pos(target_objp, Player->locking_subsys, &lock_world_pos);
Player->locking_on_center=0;
Player->locking_subsys_parent=Player_ai->target_objnum;
} else {
hud_lock_reset();
return;
}
} else {
// if small ship (or weapon), just go for the center
lock_world_pos = target_objp->pos;
Player->locking_on_center=1;
Player->locking_subsys=NULL;
Player->locking_subsys_parent=-1;
}
}
// Decide which point lock should be homing on
void hud_lock_determine_lock_point(vec3d *lock_world_pos_out)
{
object *target_objp;
ship_weapon *swp;
weapon_info *wip;
vec3d vec_to_lock_pos;
vec3d lock_local_pos;
Assert(Player_ai->target_objnum >= 0);
target_objp = &Objects[Player_ai->target_objnum];
Player->current_target_sx = -1;
Player->current_target_sy = -1;
swp = &Player_ship->weapons;
wip = &Weapon_info[swp->secondary_bank_weapons[swp->current_secondary_bank]];
// If subsystem is targeted, we must try to lock on that
if ( Player_ai->targeted_subsys && !(wip->wi_flags & WIF_HOMING_JAVELIN) ) {
hud_lock_update_lock_pos(target_objp);
Player->locking_on_center=0;
Player->locking_subsys=Player_ai->targeted_subsys;
Player->locking_subsys_parent=Player_ai->target_objnum;
} else if ( (wip->wi_flags & WIF_HOMING_JAVELIN) && (target_objp->type == OBJ_SHIP)) {
if (!Player->locking_subsys ||
Player->locking_subsys->system_info->type != SUBSYSTEM_ENGINE) {
Player->locking_subsys = ship_get_closest_subsys_in_sight(&Ships[target_objp->instance], SUBSYSTEM_ENGINE, &Player_obj->pos);
}
if (Player->locking_subsys != NULL) {
get_subsystem_world_pos(target_objp, Player->locking_subsys, &lock_world_pos);
Player->locking_on_center=0;
Player->locking_subsys_parent=Player_ai->target_objnum;
} else {
hud_lock_reset();
return;
}
} else {
// See if we already have a successful locked point
if ( hud_lock_has_homing_point() ) {
hud_lock_update_lock_pos(target_objp);
} else {
hud_lock_get_new_lock_pos(target_objp);
}
}
*lock_world_pos_out=lock_world_pos;
vm_vec_sub(&vec_to_lock_pos,&lock_world_pos,&Player_obj->pos);
vm_vec_rotate(&lock_local_pos,&vec_to_lock_pos,&Player_obj->orient);
if ( lock_local_pos.xyz.z > 0.0f ) {
// Get the location of our target in the "virtual frame" where the locking computation will be done
float w = 1.0f / lock_local_pos.xyz.z;
// Let's force our "virtual frame" to be 640x480. -MageKing17
float sx = gr_screen.clip_center_x + (lock_local_pos.xyz.x * VIRTUAL_FRAME_HALF_WIDTH * w);
float sy = gr_screen.clip_center_y - (lock_local_pos.xyz.y * VIRTUAL_FRAME_HALF_HEIGHT * w);
Player->current_target_sx = (int)sx;
Player->current_target_sy = (int)sy;
}
}
