void physics_apply_whack(vec3d *impulse, vec3d *pos, physics_info *pi, matrix *orient, float mass)
{
vec3d local_torque, torque;
// vec3d npos;
// Detect null vector.
if ((fl_abs(impulse->xyz.x) <= WHACK_LIMIT) && (fl_abs(impulse->xyz.y) <= WHACK_LIMIT) && (fl_abs(impulse->xyz.z) <= WHACK_LIMIT))
return;
// first do the rotational velocity
// calculate the torque on the body based on the point on the
// object that was hit and the momentum being applied to the object
vm_vec_crossprod(&torque, pos, impulse);
vm_vec_rotate ( &local_torque, &torque, orient );
vec3d delta_rotvel;
vm_vec_rotate( &delta_rotvel, &local_torque, &pi->I_body_inv );
vm_vec_scale ( &delta_rotvel, (float) ROTVEL_WHACK_CONST );
vm_vec_add2( &pi->rotvel, &delta_rotvel );
//mprintf(("Whack: %7.3f %7.3f %7.3f\n", pi->rotvel.xyz.x, pi->rotvel.xyz.y, pi->rotvel.xyz.z));
// instant whack on the velocity
// reduce damping on all axes
pi->flags |= PF_REDUCED_DAMP;
update_reduced_damp_timestamp( pi, vm_vec_mag(impulse) );
// find time for shake from weapon to end
int dtime = timestamp_until(pi->afterburner_decay);
if (dtime < WEAPON_SHAKE_TIME) {
pi->afterburner_decay = timestamp( WEAPON_SHAKE_TIME );
}
// Goober5000 - pi->mass should probably be just mass, as specified in the header
vm_vec_scale_add2( &pi->vel, impulse, 1.0f / mass );
if (!(pi->flags & PF_USE_VEL) && (vm_vec_mag_squared(&pi->vel) > MAX_SHIP_SPEED*MAX_SHIP_SPEED)) {
// Get DaveA
nprintf(("Physics", "speed reset in physics_apply_whack [speed: %f]\n", vm_vec_mag(&pi->vel)));
vm_vec_normalize(&pi->vel);
vm_vec_scale(&pi->vel, (float)RESET_SHIP_SPEED);
}
vm_vec_rotate( &pi->prev_ramp_vel, &pi->vel, orient ); // set so velocity will ramp starting from current speed
// ramped velocity is now affected by collision
}
void physics_collide_whack( vec3d *impulse, vec3d *world_delta_rotvel, physics_info *pi, matrix *orient, bool is_landing )
{
vec3d body_delta_rotvel;
// Detect null vector.
if ((fl_abs(impulse->xyz.x) <= WHACK_LIMIT) && (fl_abs(impulse->xyz.y) <= WHACK_LIMIT) && (fl_abs(impulse->xyz.z) <= WHACK_LIMIT))
return;
vm_vec_rotate( &body_delta_rotvel, world_delta_rotvel, orient );
// vm_vec_scale( &body_delta_rotvel, (float) ROTVEL_COLLIDE_WHACK_CONST );
vm_vec_add2( &pi->rotvel, &body_delta_rotvel );
update_reduced_damp_timestamp( pi, vm_vec_mag(impulse) );
// find time for shake from weapon to end
if (!is_landing) {
int dtime = timestamp_until(pi->afterburner_decay);
if (dtime < WEAPON_SHAKE_TIME) {
pi->afterburner_decay = timestamp( WEAPON_SHAKE_TIME );
}
}
pi->flags |= PF_REDUCED_DAMP;
vm_vec_scale_add2( &pi->vel, impulse, 1.0f / pi->mass );
// check that collision does not give ship too much speed
// reset if too high
if (!(pi->flags & PF_USE_VEL) && (vm_vec_mag_squared(&pi->vel) > MAX_SHIP_SPEED*MAX_SHIP_SPEED)) {
// Get DaveA
nprintf(("Physics", "speed reset in physics_collide_whack [speed: %f]\n", vm_vec_mag(&pi->vel)));
vm_vec_normalize(&pi->vel);
vm_vec_scale(&pi->vel, (float)RESET_SHIP_SPEED);
}
vm_vec_rotate( &pi->prev_ramp_vel, &pi->vel, orient ); // set so velocity will ramp starting from current speed
// ramped velocity is now affected by collision
// rotate previous ramp velocity (in model coord) to be same as vel (in world coords)
}
void physics_apply_shock(vec3d *direction_vec, float pressure, physics_info *pi, matrix *orient, vec3d *min, vec3d *max, float radius)
{
vec3d normal;
vec3d local_torque, temp_torque, torque;
vec3d impact_vec;
vec3d area;
vec3d sin;
if (radius > MAX_RADIUS) {
return;
}
vm_vec_normalize_safe ( direction_vec );
area.xyz.x = (max->xyz.y - min->xyz.z) * (max->xyz.z - min->xyz.z);
area.xyz.y = (max->xyz.x - min->xyz.x) * (max->xyz.z - min->xyz.z);
area.xyz.z = (max->xyz.x - min->xyz.x) * (max->xyz.y - min->xyz.y);
normal.xyz.x = vm_vec_dotprod( direction_vec, &orient->vec.rvec );
normal.xyz.y = vm_vec_dotprod( direction_vec, &orient->vec.uvec );
normal.xyz.z = vm_vec_dotprod( direction_vec, &orient->vec.fvec );
sin.xyz.x = fl_sqrt( fl_abs(1.0f - normal.xyz.x*normal.xyz.x) );
sin.xyz.y = fl_sqrt( fl_abs(1.0f - normal.xyz.y*normal.xyz.y) );
sin.xyz.z = fl_sqrt( fl_abs(1.0f - normal.xyz.z*normal.xyz.z) );
vm_vec_make( &torque, 0.0f, 0.0f, 0.0f );
// find the torque exerted due to the shockwave hitting each face
// model the effect of the shockwave as if the shockwave were a plane of projectiles,
// all moving in the direction direction_vec. then find the torque as the cross prod
// of the force (pressure * area * normal * sin * scale * mass)
// normal takes account the fraction of the surface exposed to the shockwave
// the sin term is not technically needed but "feels" better
// scale factors out the increase in area with larger objects
// more massive objects get less rotation
// find torque due to forces on the right/left face
if ( normal.xyz.x < 0.0f ) // normal < 0, hits the right face
vm_vec_copy_scale( &impact_vec, &orient->vec.rvec, max->xyz.x * pressure * area.xyz.x * normal.xyz.x * sin.xyz.x / pi->mass );
else // normal > 0, hits the left face
vm_vec_copy_scale( &impact_vec, &orient->vec.rvec, min->xyz.x * pressure * area.xyz.x * -normal.xyz.x * sin.xyz.x / pi->mass );
vm_vec_crossprod( &temp_torque, &impact_vec, direction_vec );
vm_vec_add2( &torque, &temp_torque );
// find torque due to forces on the up/down face
if ( normal.xyz.y < 0.0f )
vm_vec_copy_scale( &impact_vec, &orient->vec.uvec, max->xyz.y * pressure * area.xyz.y * normal.xyz.y * sin.xyz.y / pi->mass );
else
vm_vec_copy_scale( &impact_vec, &orient->vec.uvec, min->xyz.y * pressure * area.xyz.y * -normal.xyz.y * sin.xyz.y / pi->mass );
vm_vec_crossprod( &temp_torque, &impact_vec, direction_vec );
vm_vec_add2( &torque, &temp_torque );
// find torque due to forces on the forward/backward face
if ( normal.xyz.z < 0.0f )
vm_vec_copy_scale( &impact_vec, &orient->vec.fvec, max->xyz.z * pressure * area.xyz.z * normal.xyz.z * sin.xyz.z / pi->mass );
else
vm_vec_copy_scale( &impact_vec, &orient->vec.fvec, min->xyz.z * pressure * area.xyz.z * -normal.xyz.z * sin.xyz.z / pi->mass );
vm_vec_crossprod( &temp_torque, &impact_vec, direction_vec );
vm_vec_add2( &torque, &temp_torque );
// compute delta rotvel, scale according to blast and radius
float scale;
if (radius < MIN_RADIUS) {
scale = 1.0f;
} else {
scale = (MAX_RADIUS - radius)/(MAX_RADIUS-MIN_RADIUS);
}
// set shockwave shake amplitude, duration, flag
pi->shockwave_shake_amp = (float)(MAX_SHAKE*(pressure/STD_PRESSURE)*scale);
pi->shockwave_decay = timestamp( SW_BLAST_DURATION );
pi->flags |= PF_IN_SHOCKWAVE;
// safety dance
if (!(IS_VEC_NULL_SQ_SAFE(&torque))) {
vec3d delta_rotvel;
vm_vec_rotate( &local_torque, &torque, orient );
vm_vec_copy_normalize(&delta_rotvel, &local_torque);
vm_vec_scale(&delta_rotvel, (float)(MAX_ROTVEL*(pressure/STD_PRESSURE)*scale));
// nprintf(("Physics", "rotvel scale %f\n", (MAX_ROTVEL*(pressure/STD_PRESSURE)*scale)));
vm_vec_add2(&pi->rotvel, &delta_rotvel);
}
// set reduced translational damping, set flags
float velocity_scale = (float)MAX_VEL*scale;
pi->flags |= PF_REDUCED_DAMP;
update_reduced_damp_timestamp( pi, velocity_scale*pi->mass );
vm_vec_scale_add2( &pi->vel, direction_vec, velocity_scale );
vm_vec_rotate(&pi->prev_ramp_vel, &pi->vel, orient); // set so velocity will ramp starting from current speed
// check that kick from shockwave is not too large
if (!(pi->flags & PF_USE_VEL) && (vm_vec_mag_squared(&pi->vel) > MAX_SHIP_SPEED*MAX_SHIP_SPEED)) {
// Get DaveA
nprintf(("Physics", "speed reset in physics_apply_shock [speed: %f]\n", vm_vec_mag(&pi->vel)));
vm_vec_normalize(&pi->vel);
vm_vec_scale(&pi->vel, (float)RESET_SHIP_SPEED);
}
}
// Returns TRUE if the weapon will never hit the other object.
// If it can it predicts how long until these two objects need
// to be checked and fills the time in in current_pair.
int weapon_will_never_hit( object *obj_weapon, object *other, obj_pair * current_pair )
{
Assert( obj_weapon->type == OBJ_WEAPON );
weapon *wp = &Weapons[obj_weapon->instance];
weapon_info *wip = &Weapon_info[wp->weapon_info_index];
// mprintf(( "Frame: %d, Weapon=%d, Other=%d, pair=$%08x\n", G3_frame_count, OBJ_INDEX(weapon), OBJ_INDEX(other), current_pair ));
// Do some checks for weapons that don't turn
if ( !(wip->wi_flags & WIF_TURNS) ) {
// This first check is to see if a weapon is behind an object, and they
// are heading in opposite directions. If so, we don't need to ever check
// them again. This is only valid for weapons that don't turn.
float vdot;
if (wip->subtype == WP_LASER) {
vec3d velocity_rel_weapon;
vm_vec_sub(&velocity_rel_weapon, &obj_weapon->phys_info.vel, &other->phys_info.vel);
vdot = -vm_vec_dot(&velocity_rel_weapon, &obj_weapon->orient.vec.fvec);
} else {
vdot = vm_vec_dot( &other->phys_info.vel, &obj_weapon->phys_info.vel);
}
if ( vdot <= 0.0f ) {
// They're heading in opposite directions...
// check their positions
vec3d weapon2other;
vm_vec_sub( &weapon2other, &other->pos, &obj_weapon->pos );
float pdot = vm_vec_dot( &obj_weapon->orient.vec.fvec, &weapon2other );
if ( pdot <= -other->radius ) {
// The other object is behind the weapon by more than
// its radius, so it will never hit...
return 1;
}
}
// FUTURE ENHANCEMENT IDEAS
// Given a laser does it hit a slow or not moving object
// in its life or the next n seconds? We'd actually need to check the
// model for this.
}
// This check doesn't care about orient, only looks at the maximum speed
// of the two objects, so it knows that in the next n seconds, they can't
// go further than some distance, so don't bother checking collisions for
// that time. This is very rough, but is so general that it works for
// everything and immidiately gets rid of a lot of cases.
if ( current_pair ) {
// Find the time it will take before these get within each others distances.
// tmp->next_check_time = timestamp(500);
//vector max_vel; //maximum foward velocity in x,y,z
float max_vel_weapon, max_vel_other;
//SUSHI: Fix bug where additive weapon velocity screws up collisions
//Assumes that weapons which don't home don't change speed, which is currently the case.
if (!(wip->wi_flags & WIF_TURNS))
max_vel_weapon = obj_weapon->phys_info.speed;
else if (wp->lssm_stage==5)
max_vel_weapon = wip->lssm_stage5_vel;
else
max_vel_weapon = wp->weapon_max_vel;
max_vel_other = other->phys_info.max_vel.xyz.z;
if (max_vel_other < 10.0f) {
if ( vm_vec_mag_squared( &other->phys_info.vel ) > 100 ) {
// bump up velocity from collision
max_vel_other = vm_vec_mag( &other->phys_info.vel ) + 10.0f;
} else {
max_vel_other = 10.0f; // object may move from collision
}
}
// check weapon that does not turn against sphere expanding at ship maxvel
// compare (weeapon) ray with expanding sphere (ship) to find earliest possible collision time
// look for two time solutions to Xw = Xs, where Xw = Xw0 + Vwt*t Xs = Xs + Vs*(t+dt), where Vs*dt = radius of ship
// Since direction of Vs is unknown, solve for (Vs*t) and find norm of both sides
if ( !(wip->wi_flags & WIF_TURNS) ) {
vec3d delta_x, laser_vel;
float a,b,c, delta_x_dot_vl, delta_t;
float root1, root2, root, earliest_time;
if (max_vel_weapon == max_vel_other) {
// this will give us NAN using the below formula, so check every frame
current_pair->next_check_time = timestamp(0);
return 0;
}
vm_vec_sub( &delta_x, &obj_weapon->pos, &other->pos );
laser_vel = obj_weapon->phys_info.vel;
// vm_vec_copy_scale( &laser_vel, &weapon->orient.vec.fvec, max_vel_weapon );
delta_t = (other->radius + 10.0f) / max_vel_other; // time to get from center to radius of other obj
delta_x_dot_vl = vm_vec_dotprod( &delta_x, &laser_vel );
a = max_vel_weapon*max_vel_weapon - max_vel_other*max_vel_other;
b = 2.0f * (delta_x_dot_vl - max_vel_other*max_vel_other*delta_t);
c = vm_vec_mag_squared( &delta_x ) - max_vel_other*max_vel_other*delta_t*delta_t;
float discriminant = b*b - 4.0f*a*c;
if ( discriminant < 0) {
// never hit
return 1;
} else {
root = fl_sqrt( discriminant );
root1 = (-b + root) / (2.0f * a) * 1000.0f; // get time in ms
root2 = (-b - root) / (2.0f * a) * 1000.0f; // get time in ms
}
// standard algorithm
if (max_vel_weapon > max_vel_other) {
// find earliest positive time
if ( root1 > root2 ) {
float temp = root1;
root1 = root2;
root2 = temp;
}
if (root1 > 0) {
earliest_time = root1;
} else if (root2 > 0) {
// root1 < 0 and root2 > 0, so we're inside sphere and next check should be next frame
current_pair->next_check_time = timestamp(0); // check next time
return 0;
} else {
// both times negative, so never collides
return 1;
}
}
// need to modify it for weapons that are slower than ships
else {
if (root2 > 0) {
earliest_time = root2;
} else {
current_pair->next_check_time = timestamp(0);
return 0;
}
}
// check if possible collision occurs after weapon expires
if ( earliest_time > 1000*wp->lifeleft )
return 1;
// Allow one worst case frametime to elapse (~5 fps)
earliest_time -= 200.0f;
if (earliest_time > 100) {
current_pair->next_check_time = timestamp( fl2i(earliest_time) );
return 0;
} else {
current_pair->next_check_time = timestamp(0); // check next time
return 0;
}
} else {
float dist, max_vel, time;
max_vel = max_vel_weapon + max_vel_other;
// suggest that fudge factor for other radius be changed to other_radius + const (~10)
dist = vm_vec_dist( &other->pos, &obj_weapon->pos ) - (other->radius + 10.0f);
if ( dist > 0.0f ) {
time = (dist*1000.0f) / max_vel;
int time_ms = fl2i(time);
// check if possible collision occurs after weapon expires
if ( time_ms > 1000*wp->lifeleft )
return 1;
time_ms -= 200; // Allow at least one worst case frametime to elapse (~5 fps)
if ( time_ms > 100 ) { // If it takes longer than 1/10th of a second, then delay it
current_pair->next_check_time = timestamp(time_ms);
//mprintf(( "Delaying %d ms\n", time_ms ));
return 0;
}
}
current_pair->next_check_time = timestamp(0); // check next time
}
}
return 0;
}
// Adds the pair to the pair list
void obj_add_pair( object *A, object *B, int check_time, int add_to_end )
{
uint ctype;
int (*check_collision)( obj_pair *pair );
int swapped = 0;
check_collision = NULL;
if ( Num_pairs_allocated == 0 ) return; // don't have anything to add the pair too
if ( A==B ) return; // Don't check collisions with yourself
if ( !(A->flags&OF_COLLIDES) ) return; // This object doesn't collide with anything
if ( !(B->flags&OF_COLLIDES) ) return; // This object doesn't collide with anything
// Make sure you're not checking a parent with it's kid or vicy-versy
// if ( A->parent_sig == B->signature && !(A->type == OBJ_SHIP && B->type == OBJ_DEBRIS) ) return;
// if ( B->parent_sig == A->signature && !(A->type == OBJ_DEBRIS && B->type == OBJ_SHIP) ) return;
if ( reject_obj_pair_on_parent(A,B) ) {
return;
}
Assert( A->type < 127 );
Assert( B->type < 127 );
ctype = COLLISION_OF(A->type,B->type);
switch( ctype ) {
case COLLISION_OF(OBJ_WEAPON,OBJ_SHIP):
swapped = 1;
check_collision = collide_ship_weapon;
break;
case COLLISION_OF(OBJ_SHIP, OBJ_WEAPON):
check_collision = collide_ship_weapon;
break;
case COLLISION_OF(OBJ_DEBRIS, OBJ_WEAPON):
check_collision = collide_debris_weapon;
break;
case COLLISION_OF(OBJ_WEAPON, OBJ_DEBRIS):
swapped = 1;
check_collision = collide_debris_weapon;
break;
case COLLISION_OF(OBJ_DEBRIS, OBJ_SHIP):
check_collision = collide_debris_ship;
break;
case COLLISION_OF(OBJ_SHIP, OBJ_DEBRIS):
check_collision = collide_debris_ship;
swapped = 1;
break;
case COLLISION_OF(OBJ_ASTEROID, OBJ_WEAPON):
// Only check collision's with player weapons
// if ( Objects[B->parent].flags & OF_PLAYER_SHIP ) {
check_collision = collide_asteroid_weapon;
// }
break;
case COLLISION_OF(OBJ_WEAPON, OBJ_ASTEROID):
swapped = 1;
// Only check collision's with player weapons
// if ( Objects[A->parent].flags & OF_PLAYER_SHIP ) {
check_collision = collide_asteroid_weapon;
// }
break;
case COLLISION_OF(OBJ_ASTEROID, OBJ_SHIP):
// Only check collisions with player ships
// if ( B->flags & OF_PLAYER_SHIP ) {
check_collision = collide_asteroid_ship;
// }
break;
case COLLISION_OF(OBJ_SHIP, OBJ_ASTEROID):
// Only check collisions with player ships
// if ( A->flags & OF_PLAYER_SHIP ) {
check_collision = collide_asteroid_ship;
// }
swapped = 1;
break;
case COLLISION_OF(OBJ_SHIP,OBJ_SHIP):
check_collision = collide_ship_ship;
break;
case COLLISION_OF(OBJ_BEAM, OBJ_SHIP):
if(beam_collide_early_out(A, B)){
return;
}
check_collision = beam_collide_ship;
break;
case COLLISION_OF(OBJ_BEAM, OBJ_ASTEROID):
if(beam_collide_early_out(A, B)){
return;
}
check_collision = beam_collide_asteroid;
break;
case COLLISION_OF(OBJ_BEAM, OBJ_DEBRIS):
if(beam_collide_early_out(A, B)){
return;
}
check_collision = beam_collide_debris;
break;
case COLLISION_OF(OBJ_BEAM, OBJ_WEAPON):
if(beam_collide_early_out(A, B)){
return;
}
check_collision = beam_collide_missile;
break;
case COLLISION_OF(OBJ_WEAPON, OBJ_WEAPON): {
weapon_info *awip, *bwip;
awip = &Weapon_info[Weapons[A->instance].weapon_info_index];
bwip = &Weapon_info[Weapons[B->instance].weapon_info_index];
if ((awip->weapon_hitpoints > 0) || (bwip->weapon_hitpoints > 0)) {
if (bwip->weapon_hitpoints == 0) {
check_collision = collide_weapon_weapon;
swapped=1;
} else {
check_collision = collide_weapon_weapon;
}
}
/*
if (awip->subtype != WP_LASER || bwip->subtype != WP_LASER) {
if (awip->subtype == WP_LASER) {
if ( bwip->wi_flags & WIF_BOMB ) {
check_collision = collide_weapon_weapon;
}
} else if (bwip->subtype == WP_LASER) {
if ( awip->wi_flags & WIF_BOMB ) {
check_collision = collide_weapon_weapon;
swapped=1;
}
} else {
if ( (awip->wi_flags&WIF_BOMB) || (bwip->wi_flags&WIF_BOMB) ) {
check_collision = collide_weapon_weapon;
}
}
}
*/
/*
int atype, btype;
atype = Weapon_info[Weapons[A->instance].weapon_info_index].subtype;
btype = Weapon_info[Weapons[B->instance].weapon_info_index].subtype;
if ((atype == WP_LASER) && (btype == WP_MISSILE))
check_collision = collide_weapon_weapon;
else if ((atype == WP_MISSILE) && (btype == WP_LASER)) {
check_collision = collide_weapon_weapon;
swapped = 1;
} else if ((atype == WP_MISSILE) && (btype == WP_MISSILE))
check_collision = collide_weapon_weapon;
*/
break;
}
default:
return;
}
// Swap them if needed
if ( swapped ) {
object *tmp = A;
A = B;
B = tmp;
}
// if there are any more obj_pair checks
// we should then add function int maybe_not_add_obj_pair()
// MWA -- 4/1/98 -- I'd do it, but I don't want to bust anything, so I'm doing my stuff here instead :-)
//if ( MULTIPLAYER_CLIENT && !(Netgame.debug_flags & NETD_FLAG_CLIENT_NODAMAGE)){
// multiplayer clients will only do ship/ship collisions, and their own ship to boot
// if ( check_collision != collide_ship_ship ){
// return;
// }
// if ( (A != Player_obj) && (B != Player_obj) ){
// return;
// }
//}
// only check debris:weapon collisions for player
if (check_collision == collide_debris_weapon) {
// weapon is B
if ( !(Weapon_info[Weapons[B->instance].weapon_info_index].wi_flags & WIF_TURNS) ) {
// check for dumbfire weapon
// check if debris is behind laser
float vdot;
if (Weapon_info[Weapons[B->instance].weapon_info_index].subtype == WP_LASER) {
vec3d velocity_rel_weapon;
vm_vec_sub(&velocity_rel_weapon, &B->phys_info.vel, &A->phys_info.vel);
vdot = -vm_vec_dot(&velocity_rel_weapon, &B->orient.vec.fvec);
} else {
vdot = vm_vec_dot( &A->phys_info.vel, &B->phys_info.vel);
}
if ( vdot <= 0.0f ) {
// They're heading in opposite directions...
// check their positions
vec3d weapon2other;
vm_vec_sub( &weapon2other, &A->pos, &B->pos );
float pdot = vm_vec_dot( &B->orient.vec.fvec, &weapon2other );
if ( pdot <= -A->radius ) {
// The other object is behind the weapon by more than
// its radius, so it will never hit...
return;
}
}
// check dist vs. dist moved during weapon lifetime
vec3d delta_v;
vm_vec_sub(&delta_v, &B->phys_info.vel, &A->phys_info.vel);
if (vm_vec_dist_squared(&A->pos, &B->pos) > (vm_vec_mag_squared(&delta_v)*Weapons[B->instance].lifeleft*Weapons[B->instance].lifeleft)) {
return;
}
// for nonplayer ships, only create collision pair if close enough
if ( (B->parent >= 0) && !(Objects[B->parent].flags & OF_PLAYER_SHIP) && (vm_vec_dist(&B->pos, &A->pos) < (4.0f*A->radius + 200.0f)) )
return;
}
}
// don't check same team laser:ship collisions on small ships if not player
if (check_collision == collide_ship_weapon) {
// weapon is B
if ( (B->parent >= 0)
&& !(Objects[B->parent].flags & OF_PLAYER_SHIP)
&& (Ships[Objects[B->parent].instance].team == Ships[A->instance].team)
&& (Ship_info[Ships[A->instance].ship_info_index].flags & SIF_SMALL_SHIP)
&& (Weapon_info[Weapons[B->instance].weapon_info_index].subtype == WP_LASER) ) {
pairs_not_created++;
return;
}
}
if ( !check_collision ) return;
Pairs_created++;
// At this point, we have determined that collisions between
// these two should be checked, so add the pair to the
// collision pair list.
if ( pair_free_list.next == NULL ) {
nprintf(( "collision", "Out of object pairs!! Not all collisions will work!\n" ));
return;
}
Num_pairs++;
/* if (Num_pairs > Num_pairs_hwm) {
Num_pairs_hwm = Num_pairs;
//nprintf(("AI", "Num_pairs high water mark = %i\n", Num_pairs_hwm));
}
*/
if ( Num_pairs >= (Num_pairs_allocated - 20) ) {
int i;
Assert( Obj_pairs != NULL );
int old_pair_count = Num_pairs_allocated;
obj_pair *old_pairs_ptr = Obj_pairs;
// determine where we need to update the "previous" ptrs to
int prev_free_mark = (pair_free_list.next - old_pairs_ptr);
int prev_used_mark = (pair_used_list.next - old_pairs_ptr);
Obj_pairs = (obj_pair*) vm_realloc_q( Obj_pairs, sizeof(obj_pair) * (Num_pairs_allocated + PAIRS_BUMP) );
// allow us to fail here and only if we don't do we setup the new pairs
if (Obj_pairs == NULL) {
// failed, just go back to the way we were and use only the pairs we have already
Obj_pairs = old_pairs_ptr;
} else {
Num_pairs_allocated += PAIRS_BUMP;
Assert( Obj_pairs != NULL );
// have to reset all of the "next" ptrs for the old set and handle the new set
for (i = 0; i < Num_pairs_allocated; i++) {
if (i >= old_pair_count) {
memset( &Obj_pairs[i], 0, sizeof(obj_pair) );
Obj_pairs[i].next = &Obj_pairs[i+1];
} else {
if (Obj_pairs[i].next != NULL) {
// the "next" ptr will end up going backwards for used pairs so we have
// to allow for that with this craziness...
int next_mark = (Obj_pairs[i].next - old_pairs_ptr);
Obj_pairs[i].next = &Obj_pairs[next_mark];
}
// catch that last NULL from the previously allocated set
if ( i == (old_pair_count-1) ) {
Obj_pairs[i].next = &Obj_pairs[i+1];
}
}
}
Obj_pairs[Num_pairs_allocated-1].next = NULL;
// reset the "previous" ptrs
pair_free_list.next = &Obj_pairs[prev_free_mark];
pair_used_list.next = &Obj_pairs[prev_used_mark];
}
}
// get a new obj_pair from the free list
obj_pair * new_pair = pair_free_list.next;
pair_free_list.next = new_pair->next;
if ( add_to_end ) {
obj_pair *last, *tmp;
last = tmp = pair_used_list.next;
while( tmp != NULL ) {
if ( tmp->next == NULL )
last = tmp;
tmp = tmp->next;
}
if ( last == NULL )
last = &pair_used_list;
last->next = new_pair;
Assert(new_pair != NULL);
new_pair->next = NULL;
}
else {
new_pair->next = pair_used_list.next;
pair_used_list.next = new_pair;
}
A->num_pairs++;
B->num_pairs++;
new_pair->a = A;
new_pair->b = B;
new_pair->check_collision = check_collision;
if ( check_time == -1 ){
new_pair->next_check_time = timestamp(0); // 0 means instantly time out
} else {
new_pair->next_check_time = check_time;
}
}
void obj_collide_pair(object *A, object *B)
{
uint ctype;
int (*check_collision)( obj_pair *pair );
int swapped = 0;
check_collision = NULL;
if ( A==B ) return; // Don't check collisions with yourself
if ( !(A->flags&OF_COLLIDES) ) return; // This object doesn't collide with anything
if ( !(B->flags&OF_COLLIDES) ) return; // This object doesn't collide with anything
// Make sure you're not checking a parent with it's kid or vicy-versy
// if ( A->parent_sig == B->signature && !(A->type == OBJ_SHIP && B->type == OBJ_DEBRIS) ) return;
// if ( B->parent_sig == A->signature && !(A->type == OBJ_DEBRIS && B->type == OBJ_SHIP) ) return;
if ( reject_obj_pair_on_parent(A,B) ) {
return;
}
Assert( A->type < 127 );
Assert( B->type < 127 );
ctype = COLLISION_OF(A->type,B->type);
switch( ctype ) {
case COLLISION_OF(OBJ_WEAPON,OBJ_SHIP):
swapped = 1;
check_collision = collide_ship_weapon;
break;
case COLLISION_OF(OBJ_SHIP, OBJ_WEAPON):
check_collision = collide_ship_weapon;
break;
case COLLISION_OF(OBJ_DEBRIS, OBJ_WEAPON):
check_collision = collide_debris_weapon;
break;
case COLLISION_OF(OBJ_WEAPON, OBJ_DEBRIS):
swapped = 1;
check_collision = collide_debris_weapon;
break;
case COLLISION_OF(OBJ_DEBRIS, OBJ_SHIP):
check_collision = collide_debris_ship;
break;
case COLLISION_OF(OBJ_SHIP, OBJ_DEBRIS):
check_collision = collide_debris_ship;
swapped = 1;
break;
case COLLISION_OF(OBJ_ASTEROID, OBJ_WEAPON):
// Only check collision's with player weapons
// if ( Objects[B->parent].flags & OF_PLAYER_SHIP ) {
check_collision = collide_asteroid_weapon;
// }
break;
case COLLISION_OF(OBJ_WEAPON, OBJ_ASTEROID):
swapped = 1;
// Only check collision's with player weapons
// if ( Objects[A->parent].flags & OF_PLAYER_SHIP ) {
check_collision = collide_asteroid_weapon;
// }
break;
case COLLISION_OF(OBJ_ASTEROID, OBJ_SHIP):
// Only check collisions with player ships
// if ( B->flags & OF_PLAYER_SHIP ) {
check_collision = collide_asteroid_ship;
// }
break;
case COLLISION_OF(OBJ_SHIP, OBJ_ASTEROID):
// Only check collisions with player ships
// if ( A->flags & OF_PLAYER_SHIP ) {
check_collision = collide_asteroid_ship;
// }
swapped = 1;
break;
case COLLISION_OF(OBJ_SHIP,OBJ_SHIP):
check_collision = collide_ship_ship;
break;
case COLLISION_OF(OBJ_SHIP, OBJ_BEAM):
if(beam_collide_early_out(B, A)){
return;
}
swapped = 1;
check_collision = beam_collide_ship;
break;
case COLLISION_OF(OBJ_BEAM, OBJ_SHIP):
if(beam_collide_early_out(A, B)){
return;
}
check_collision = beam_collide_ship;
break;
case COLLISION_OF(OBJ_ASTEROID, OBJ_BEAM):
if(beam_collide_early_out(B, A)) {
return;
}
swapped = 1;
check_collision = beam_collide_asteroid;
break;
case COLLISION_OF(OBJ_BEAM, OBJ_ASTEROID):
if(beam_collide_early_out(A, B)){
return;
}
check_collision = beam_collide_asteroid;
break;
case COLLISION_OF(OBJ_DEBRIS, OBJ_BEAM):
if(beam_collide_early_out(B, A)) {
return;
}
swapped = 1;
check_collision = beam_collide_debris;
break;
case COLLISION_OF(OBJ_BEAM, OBJ_DEBRIS):
if(beam_collide_early_out(A, B)){
return;
}
check_collision = beam_collide_debris;
break;
case COLLISION_OF(OBJ_WEAPON, OBJ_BEAM):
if(beam_collide_early_out(B, A)) {
return;
}
swapped = 1;
check_collision = beam_collide_missile;
break;
case COLLISION_OF(OBJ_BEAM, OBJ_WEAPON):
if(beam_collide_early_out(A, B)){
return;
}
check_collision = beam_collide_missile;
break;
case COLLISION_OF(OBJ_WEAPON, OBJ_WEAPON): {
weapon_info *awip, *bwip;
awip = &Weapon_info[Weapons[A->instance].weapon_info_index];
bwip = &Weapon_info[Weapons[B->instance].weapon_info_index];
if ((awip->weapon_hitpoints > 0) || (bwip->weapon_hitpoints > 0)) {
if (bwip->weapon_hitpoints == 0) {
check_collision = collide_weapon_weapon;
swapped=1;
} else {
check_collision = collide_weapon_weapon;
}
}
break;
}
default:
return;
}
if ( !check_collision ) return;
// Swap them if needed
if ( swapped ) {
object *tmp = A;
A = B;
B = tmp;
}
collider_pair *collision_info = NULL;
bool valid = false;
uint key = (OBJ_INDEX(A) << 12) + OBJ_INDEX(B);
collision_info = &Collision_cached_pairs[key];
if ( collision_info->initialized ) {
// make sure we're referring to the correct objects in case the original pair was deleted
if ( collision_info->signature_a == collision_info->a->signature &&
collision_info->signature_b == collision_info->b->signature ) {
valid = true;
} else {
collision_info->a = A;
collision_info->b = B;
collision_info->signature_a = A->signature;
collision_info->signature_b = B->signature;
collision_info->next_check_time = timestamp(0);
}
} else {
collision_info->a = A;
collision_info->b = B;
collision_info->signature_a = A->signature;
collision_info->signature_b = B->signature;
collision_info->initialized = true;
collision_info->next_check_time = timestamp(0);
}
if ( valid && A->type != OBJ_BEAM ) {
// if this signature is valid, make the necessary checks to see if we need to collide check
if ( collision_info->next_check_time == -1 ) {
return;
} else {
if ( !timestamp_elapsed(collision_info->next_check_time) ) {
return;
}
}
} else {
//if ( A->type == OBJ_BEAM ) {
//if(beam_collide_early_out(A, B)){
//collision_info->next_check_time = -1;
//return;
//}
//}
// only check debris:weapon collisions for player
if (check_collision == collide_debris_weapon) {
// weapon is B
if ( !(Weapon_info[Weapons[B->instance].weapon_info_index].wi_flags & WIF_TURNS) ) {
// check for dumbfire weapon
// check if debris is behind laser
float vdot;
if (Weapon_info[Weapons[B->instance].weapon_info_index].subtype == WP_LASER) {
vec3d velocity_rel_weapon;
vm_vec_sub(&velocity_rel_weapon, &B->phys_info.vel, &A->phys_info.vel);
vdot = -vm_vec_dot(&velocity_rel_weapon, &B->orient.vec.fvec);
} else {
vdot = vm_vec_dot( &A->phys_info.vel, &B->phys_info.vel);
}
if ( vdot <= 0.0f ) {
// They're heading in opposite directions...
// check their positions
vec3d weapon2other;
vm_vec_sub( &weapon2other, &A->pos, &B->pos );
float pdot = vm_vec_dot( &B->orient.vec.fvec, &weapon2other );
if ( pdot <= -A->radius ) {
// The other object is behind the weapon by more than
// its radius, so it will never hit...
collision_info->next_check_time = -1;
return;
}
}
// check dist vs. dist moved during weapon lifetime
vec3d delta_v;
vm_vec_sub(&delta_v, &B->phys_info.vel, &A->phys_info.vel);
if (vm_vec_dist_squared(&A->pos, &B->pos) > (vm_vec_mag_squared(&delta_v)*Weapons[B->instance].lifeleft*Weapons[B->instance].lifeleft)) {
collision_info->next_check_time = -1;
return;
}
// for nonplayer ships, only create collision pair if close enough
if ( (B->parent >= 0) && !(Objects[B->parent].flags & OF_PLAYER_SHIP) && (vm_vec_dist(&B->pos, &A->pos) < (4.0f*A->radius + 200.0f)) ) {
collision_info->next_check_time = -1;
return;
}
}
}
// don't check same team laser:ship collisions on small ships if not player
if (check_collision == collide_ship_weapon) {
// weapon is B
if ( (B->parent >= 0)
&& !(Objects[B->parent].flags & OF_PLAYER_SHIP)
&& (Ships[Objects[B->parent].instance].team == Ships[A->instance].team)
&& (Ship_info[Ships[A->instance].ship_info_index].flags & SIF_SMALL_SHIP)
&& (Weapon_info[Weapons[B->instance].weapon_info_index].subtype == WP_LASER) ) {
collision_info->next_check_time = -1;
return;
}
}
}
obj_pair new_pair;
new_pair.a = A;
new_pair.b = B;
new_pair.check_collision = check_collision;
new_pair.next_check_time = collision_info->next_check_time;
if ( check_collision(&new_pair) ) {
// don't have to check ever again
collision_info->next_check_time = -1;
} else {
collision_info->next_check_time = new_pair.next_check_time;
}
}