// hud_update_lock_indicator() will manage the non-rendering dependant part of
// missle locking
void hud_update_lock_indicator(float frametime)
{
ship_weapon *swp;
weapon_info *wip;
vector lock_world_pos;
#ifndef NO_NETWORK
// if i'm a multiplayer observer, bail here
if((Game_mode & GM_MULTIPLAYER) && ((Net_player->flags & NETINFO_FLAG_OBSERVER) || (Player_obj->type == OBJ_OBSERVER)) ){
return;
}
#endif
Assert(Player_ai->target_objnum != -1);
// be sure to unset this flag, then possibly set later in this function so that
// threat indicators work properly.
Player_ai->ai_flags &= ~AIF_SEEK_LOCK;
if ( hud_abort_lock() ) {
hud_lock_reset();
return;
}
// if there is an EMP effect active, never update lock
if(emp_active_local()){
hud_lock_reset();
return;
}
swp = &Player_ship->weapons;
wip = &Weapon_info[swp->secondary_bank_weapons[swp->current_secondary_bank]];
Lock_start_dist = wip->min_lock_time * wip->lock_pixels_per_sec;
// if secondary weapons change, reset the lock
if ( hud_lock_secondary_weapon_changed(swp) ) {
hud_lock_reset();
}
Player_ai->last_secondary_index = swp->current_secondary_bank;
if ( !(wip->wi_flags & WIF_HOMING_ASPECT) ) {
hud_lock_reset();
return;
}
// Allow locking on ships and bombs (only targeted weapon allowed is a bomb, so don't bother checking flags)
if ( (Objects[Player_ai->target_objnum].type != OBJ_SHIP) && (Objects[Player_ai->target_objnum].type != OBJ_WEAPON) ) {
hud_lock_reset();
return;
}
hud_lock_determine_lock_point(&lock_world_pos);
if ( !hud_lock_has_homing_point() ) {
Player->target_in_lock_cone=0;
}
hud_lock_check_if_target_in_lock_cone(&lock_world_pos);
// check if the target is within range of the current secondary weapon. If it is not,
// a lock will not be detected
if ( !hud_lock_target_in_range() ) {
Player->target_in_lock_cone = 0;
}
// If locking on a subsystem, and not in sight... can't lock
// Changed by MK on 4/3/98. It was confusing me that my hornets would not lock on my target.
// It will now be confusing that they lock, but don't home on your subsystem, but I think that's preferable.
// Often you really care about destroying the target, not just the subsystem.
/*if ( Player_ai->targeted_subsys ) {
if ( !hud_lock_on_subsys_ok() ) {
Player->target_in_lock_cone=0;
}
}*/
if ( !Player->target_in_lock_cone ) {
Player->locking_on_center=0;
Player->locking_subsys_parent=-1;
Player->locking_subsys=NULL;
}
hud_calculate_lock_position(frametime);
if (!Players[Player_num].lock_indicator_visible)
return;
if (Player_ai->current_target_is_locked) {
if ( Missile_track_loop > -1 ) {
snd_chg_loop_status(Missile_track_loop, 0);
Missile_track_loop = -1;
Missile_lock_loop = snd_play(&Snds[SND_MISSILE_LOCK]);
}
}
else {
Player_ai->ai_flags |= AIF_SEEK_LOCK; // set this flag so multiplayer's properly track lock on other ships
if ( Missile_lock_loop != -1 && snd_is_playing(Missile_lock_loop) ) {
snd_stop(Missile_lock_loop);
Missile_lock_loop = -1;
}
}
}
// hud_calculate_lock_position() will determine where on the screen to draw the lock
// indicator, and will determine when a lock has occurred. If the lock indicator is not
// on the screen yet, hud_calculate_lock_start_pos() is called to pick a starting location
void hud_calculate_lock_position(float frametime)
{
ship_weapon *swp;
weapon_info *wip;
static float pixels_moved_while_locking;
static float pixels_moved_while_degrading;
static int Need_new_start_pos = 0;
static double accumulated_x_pixels, accumulated_y_pixels;
double int_portion;
static float last_dist_to_target;
static int catching_up;
static int maintain_lock_count = 0;
static float catch_up_distance = 0.0f;
double hypotenuse, delta_x, delta_y;
swp = &Player_ship->weapons;
wip = &Weapon_info[swp->secondary_bank_weapons[swp->current_secondary_bank]];
if (Player->target_in_lock_cone) {
if (!Players[Player_num].lock_indicator_visible) {
hud_calculate_lock_start_pos();
last_dist_to_target = 0.0f;
Players[Player_num].lock_indicator_x = Players[Player_num].lock_indicator_start_x;
Players[Player_num].lock_indicator_y = Players[Player_num].lock_indicator_start_y;
Players[Player_num].lock_indicator_visible = 1;
Players[Player_num].lock_time_to_target = i2fl(wip->min_lock_time);
catching_up = 0;
}
Need_new_start_pos = 1;
if (Player_ai->current_target_is_locked) {
Players[Player_num].lock_indicator_x = Player->current_target_sx;
Players[Player_num].lock_indicator_y = Player->current_target_sy;
return;
}
delta_x = Players[Player_num].lock_indicator_x - Player->current_target_sx;
delta_y = Players[Player_num].lock_indicator_y - Player->current_target_sy;
if (!delta_y && !delta_x) {
hypotenuse = 0.0f;
}
else {
hypotenuse = _hypot(delta_y, delta_x);
}
Players[Player_num].lock_dist_to_target = (float)hypotenuse;
if (last_dist_to_target == 0) {
last_dist_to_target = Players[Player_num].lock_dist_to_target;
}
//nprintf(("Alan","dist to target: %.2f\n",Players[Player_num].lock_dist_to_target));
//nprintf(("Alan","last to target: %.2f\n\n",last_dist_to_target));
if (catching_up) {
//nprintf(("Alan","IN CATCH UP MODE catch_up_dist is %.2f\n",catch_up_distance));
if ( Players[Player_num].lock_dist_to_target < catch_up_distance )
catching_up = 0;
}
else {
//nprintf(("Alan","IN NORMAL MODE\n"));
if ( (Players[Player_num].lock_dist_to_target - last_dist_to_target) > 2.0f ) {
catching_up = 1;
catch_up_distance = last_dist_to_target + wip->catchup_pixel_penalty;
}
}
last_dist_to_target = Players[Player_num].lock_dist_to_target;
if (!catching_up) {
Players[Player_num].lock_time_to_target -= frametime;
if (Players[Player_num].lock_time_to_target < 0.0f)
Players[Player_num].lock_time_to_target = 0.0f;
}
float lock_pixels_per_sec;
if (Players[Player_num].lock_time_to_target > 0) {
lock_pixels_per_sec = Players[Player_num].lock_dist_to_target / Players[Player_num].lock_time_to_target;
} else {
lock_pixels_per_sec = i2fl(wip->lock_pixels_per_sec);
}
if (lock_pixels_per_sec > wip->lock_pixels_per_sec) {
lock_pixels_per_sec = i2fl(wip->lock_pixels_per_sec);
}
if (catching_up) {
pixels_moved_while_locking = wip->catchup_pixels_per_sec * frametime;
} else {
pixels_moved_while_locking = lock_pixels_per_sec * frametime;
}
if (delta_x != 0) {
accumulated_x_pixels += pixels_moved_while_locking * delta_x/hypotenuse;
}
if (delta_y != 0) {
accumulated_y_pixels += pixels_moved_while_locking * delta_y/hypotenuse;
}
if (fl_abs(accumulated_x_pixels) > 1.0f) {
modf(accumulated_x_pixels, &int_portion);
Players[Player_num].lock_indicator_x -= (int)int_portion;
if ( fl_abs(Players[Player_num].lock_indicator_x - Player->current_target_sx) < fl_abs(int_portion) )
Players[Player_num].lock_indicator_x = Player->current_target_sx;
accumulated_x_pixels -= int_portion;
}
if (fl_abs(accumulated_y_pixels) > 1.0f) {
modf(accumulated_y_pixels, &int_portion);
Players[Player_num].lock_indicator_y -= (int)int_portion;
if ( fl_abs(Players[Player_num].lock_indicator_y - Player->current_target_sy) < fl_abs(int_portion) )
Players[Player_num].lock_indicator_y = Player->current_target_sy;
accumulated_y_pixels -= int_portion;
}
if ( Missile_track_loop == -1 ) {
Missile_track_loop = snd_play_looping( &Snds[SND_MISSILE_TRACKING], 0.0f , -1, -1);
}
if (!Players[Player_num].lock_time_to_target) {
if ( (Players[Player_num].lock_indicator_x == Player->current_target_sx) && (Players[Player_num].lock_indicator_y == Player->current_target_sy) ) {
if (maintain_lock_count++ > 1) {
Player_ai->current_target_is_locked = 1;
}
} else {
maintain_lock_count = 0;
}
}
} else {
if ( Missile_track_loop > -1 ) {
snd_chg_loop_status(Missile_track_loop, 0);
Missile_track_loop = -1;
}
Player_ai->current_target_is_locked = 0;
if (!Players[Player_num].lock_indicator_visible) {
return;
}
catching_up = 0;
last_dist_to_target = 0.0f;
if (Need_new_start_pos) {
hud_calculate_lock_start_pos();
Need_new_start_pos = 0;
accumulated_x_pixels = 0.0f;
accumulated_y_pixels = 0.0f;
}
delta_x = Players[Player_num].lock_indicator_x - Players[Player_num].lock_indicator_start_x;
delta_y = Players[Player_num].lock_indicator_y - Players[Player_num].lock_indicator_start_y;
if (!delta_y && !delta_x) {
hypotenuse = 0.0f;
}
else {
hypotenuse = _hypot(delta_y, delta_x);
}
Players[Player_num].lock_time_to_target += frametime;
if (Players[Player_num].lock_time_to_target > wip->min_lock_time)
Players[Player_num].lock_time_to_target = i2fl(wip->min_lock_time);
pixels_moved_while_degrading = 2.0f * wip->lock_pixels_per_sec * frametime;
if (delta_x != 0)
accumulated_x_pixels += pixels_moved_while_degrading * delta_x/hypotenuse;
if (delta_y != 0)
accumulated_y_pixels += pixels_moved_while_degrading * delta_y/hypotenuse;
if (fl_abs(accumulated_x_pixels) > 1.0f) {
modf(accumulated_x_pixels, &int_portion);
Players[Player_num].lock_indicator_x -= (int)int_portion;
if ( fl_abs(Players[Player_num].lock_indicator_x - Players[Player_num].lock_indicator_start_x) < fl_abs(int_portion) )
Players[Player_num].lock_indicator_x = Players[Player_num].lock_indicator_start_x;
accumulated_x_pixels -= int_portion;
}
if (fl_abs(accumulated_y_pixels) > 1.0f) {
modf(accumulated_y_pixels, &int_portion);
Players[Player_num].lock_indicator_y -= (int)int_portion;
if ( fl_abs(Players[Player_num].lock_indicator_y - Players[Player_num].lock_indicator_start_y) < fl_abs(int_portion) )
Players[Player_num].lock_indicator_y = Players[Player_num].lock_indicator_start_y;
accumulated_y_pixels -= int_portion;
}
if ( (Players[Player_num].lock_indicator_x == Players[Player_num].lock_indicator_start_x) && (Players[Player_num].lock_indicator_y == Players[Player_num].lock_indicator_start_y) ) {
Players[Player_num].lock_indicator_visible = 0;
}
}
}
// hud_do_lock_indicator() manages missle locking, both the non-rendering calculations and the 2D HUD rendering
void hud_do_lock_indicator(float frametime)
{
ship_weapon* swp;
weapon_info* wip;
vec3d lock_world_pos;
// if i'm a multiplayer observer, bail here
if ((Game_mode & GM_MULTIPLAYER) && ((Net_player->flags & NETINFO_FLAG_OBSERVER) ||
(Player_obj->type == OBJ_OBSERVER)))
{
return;
}
Assert(Player_ai->target_objnum >= 0);
// be sure to unset this flag, then possibly set later in this function so that
// threat indicators work properly.
Player_ai->ai_flags &= ~AIF_SEEK_LOCK;
if (hud_abort_lock())
{
hud_lock_reset();
return;
}
// if there is an EMP effect active, never update lock
if (emp_active_local())
{
hud_lock_reset();
return;
}
swp = &Player_ship->weapons;
wip = &Weapon_info[swp->secondary_bank_weapons[swp->current_secondary_bank]];
Lock_start_dist = wip->min_lock_time * wip->lock_pixels_per_sec;
// if secondary weapons change, reset the lock
if (hud_lock_secondary_weapon_changed(swp))
{
hud_lock_reset();
}
Player_ai->last_secondary_index = swp->current_secondary_bank;
object* tobjp = &Objects[Player_ai->target_objnum];
vec3d dir_to_target;
vm_vec_normalized_dir(&dir_to_target, &tobjp->pos, &Player_obj->pos);
if (!(wip->wi_flags & WIF_LOCKED_HOMING))
{
hud_lock_reset();
return;
}
if ((wip->wi_flags & WIF_HOMING_JAVELIN) && (Player->locking_subsys != NULL) &&
(Player->locking_subsys->current_hits <= 0.0f))
{
hud_lock_reset();
}
// Allow locking on ships and bombs (only targeted weapon allowed is a bomb, so don't bother checking flags)
if ((Objects[Player_ai->target_objnum].type != OBJ_SHIP) && (Objects[Player_ai->target_objnum].type != OBJ_WEAPON))
{
hud_lock_reset();
return;
}
// Javelins must lock on engines if locking on a ship and those must be in sight
if (wip->wi_flags & WIF_HOMING_JAVELIN &&
tobjp->type == OBJ_SHIP &&
Player->locking_subsys != NULL)
{
vec3d subobj_pos;
vm_vec_unrotate(&subobj_pos, &Player->locking_subsys->system_info->pnt, &tobjp->orient);
vm_vec_add2(&subobj_pos, &tobjp->pos);
int target_subsys_in_sight = ship_subsystem_in_sight(tobjp,
Player->locking_subsys, &Player_obj->pos, &subobj_pos);
if (!target_subsys_in_sight || Player->locking_subsys->system_info->type != SUBSYSTEM_ENGINE)
{
Player->locking_subsys =
ship_get_closest_subsys_in_sight(&Ships[tobjp->instance], SUBSYSTEM_ENGINE, &Player_obj->pos);
}
}
if (wip->wi_flags & WIF_HOMING_JAVELIN &&
tobjp->type == OBJ_SHIP &&
Player->locking_subsys == NULL)
{
Player->locking_subsys =
ship_get_closest_subsys_in_sight(&Ships[tobjp->instance], SUBSYSTEM_ENGINE, &Player_obj->pos);
if (Player->locking_subsys == NULL)
{
hud_lock_reset();
return;
}
}
hud_lock_determine_lock_point(&lock_world_pos);
if (!hud_lock_has_homing_point())
{
Player->target_in_lock_cone = 0;
}
hud_lock_check_if_target_in_lock_cone(&lock_world_pos);
// check if the target is within range of the current secondary weapon. If it is not,
// a lock will not be detected
if (!hud_lock_target_in_range())
{
Player->target_in_lock_cone = 0;
}
// If locking on a subsystem, and not in sight... can't lock
// Changed by MK on 4/3/98. It was confusing me that my hornets would not lock on my target.
// It will now be confusing that they lock, but don't home on your subsystem, but I think that's preferable.
// Often you really care about destroying the target, not just the subsystem.
/*if ( Player_ai->targeted_subsys ) {
if ( !hud_lock_on_subsys_ok() ) {
Player->target_in_lock_cone=0;
}
}*/
if (!Player->target_in_lock_cone)
{
Player->locking_on_center = 0;
Player->locking_subsys_parent = -1;
Player->locking_subsys = NULL;
}
hud_calculate_lock_position(frametime);
if (!Players[Player_num].lock_indicator_visible)
return;
if (Player_ai->current_target_is_locked)
{
if (Missile_track_loop > -1)
{
snd_chg_loop_status(Missile_track_loop, 0);
Missile_track_loop = -1;
Missile_lock_loop = snd_play(&Snds[SND_MISSILE_LOCK]);
}
}
else
{
Player_ai->ai_flags |= AIF_SEEK_LOCK; // set this flag so multiplayer's properly track lock on other ships
if (Missile_lock_loop != -1 && snd_is_playing(Missile_lock_loop))
{
snd_stop(Missile_lock_loop);
Missile_lock_loop = -1;
}
}
hud_show_lock_indicator(frametime, &lock_world_pos);
}
