static Bool NLD_GetMatrix(M_NonLinearDeformer *nld, GF_Matrix *mx)
{
SFVec3f v1, v2;
SFRotation r;
Fixed l1, l2, dot;
/*compute rotation matrix from NLD axis to 0 0 1*/
v1 = nld->axis;
gf_vec_norm(&v1);
v2.x = v2.y = 0;
v2.z = FIX_ONE;
if (gf_vec_equal(v1, v2)) return 0;
l1 = gf_vec_len(v1);
l2 = gf_vec_len(v2);
dot = gf_divfix(gf_vec_dot(v1, v2), gf_mulfix(l1, l2));
r.x = gf_mulfix(v1.y, v2.z) - gf_mulfix(v2.y, v1.z);
r.y = gf_mulfix(v1.z, v2.x) - gf_mulfix(v2.z, v1.x);
r.z = gf_mulfix(v1.x, v2.y) - gf_mulfix(v2.x, v1.y);
r.q = gf_atan2(gf_sqrt(FIX_ONE - gf_mulfix(dot, dot)), dot);
gf_mx_init(*mx);
gf_mx_add_rotation(mx, r.q, r.x, r.y, r.z);
return 1;
}
static void TraverseSound(GF_Node *node, void *rs, Bool is_destroy)
{
GF_TraverseState *tr_state = (GF_TraverseState*) rs;
M_Sound *snd = (M_Sound *)node;
SoundStack *st = (SoundStack *)gf_node_get_private(node);
if (is_destroy) {
gf_free(st);
return;
}
if (!snd->source) return;
tr_state->sound_holder = &st->snd_ifce;
/*forward in case we're switched off*/
if (tr_state->switched_off) {
gf_node_traverse((GF_Node *) snd->source, tr_state);
}
else if (tr_state->traversing_mode==TRAVERSE_GET_BOUNDS) {
/*we can't cull sound since*/
tr_state->disable_cull = 1;
} else if (tr_state->traversing_mode==TRAVERSE_SORT) {
GF_Matrix mx;
SFVec3f usr, snd_dir, pos;
Fixed mag, ang;
/*this implies no DEF/USE for real location...*/
gf_mx_copy(st->mx, tr_state->model_matrix);
gf_mx_copy(mx, tr_state->model_matrix);
gf_mx_inverse(&mx);
snd_dir = snd->direction;
gf_vec_norm(&snd_dir);
/*get user location*/
usr = tr_state->camera->position;
gf_mx_apply_vec(&mx, &usr);
/*recenter to ellipse focal*/
gf_vec_diff(usr, usr, snd->location);
mag = gf_vec_len(usr);
if (!mag) mag = FIX_ONE/10;
ang = gf_divfix(gf_vec_dot(snd_dir, usr), mag);
usr.z = gf_mulfix(ang, mag);
usr.x = gf_sqrt(gf_mulfix(mag, mag) - gf_mulfix(usr.z, usr.z));
usr.y = 0;
if (!gf_vec_equal(usr, st->last_pos)) {
st->intensity = snd_compute_gain(snd->minBack, snd->minFront, snd->maxBack, snd->maxFront, usr);
st->intensity = gf_mulfix(st->intensity, snd->intensity);
st->last_pos = usr;
}
st->identity = (st->intensity==FIX_ONE) ? 1 : 0;
if (snd->spatialize) {
Fixed ang, sign;
SFVec3f cross;
pos = snd->location;
gf_mx_apply_vec(&tr_state->model_matrix, &pos);
gf_vec_diff(pos, pos, tr_state->camera->position);
gf_vec_diff(usr, tr_state->camera->target, tr_state->camera->position);
gf_vec_norm(&pos);
gf_vec_norm(&usr);
ang = gf_acos(gf_vec_dot(usr, pos));
/*get orientation*/
cross = gf_vec_cross(usr, pos);
sign = gf_vec_dot(cross, tr_state->camera->up);
if (sign>0) ang *= -1;
ang = (FIX_ONE + gf_sin(ang)) / 2;
st->lgain = (FIX_ONE - gf_mulfix(ang, ang));
st->rgain = FIX_ONE - gf_mulfix(FIX_ONE - ang, FIX_ONE - ang);
/*renorm between 0 and 1*/
st->lgain = gf_mulfix(st->lgain, 4*st->intensity/3);
st->rgain = gf_mulfix(st->rgain, 4*st->intensity/3);
if (st->identity && ((st->lgain!=FIX_ONE) || (st->rgain!=FIX_ONE))) st->identity = 0;
} else {
st->lgain = st->rgain = FIX_ONE;
}
gf_node_traverse((GF_Node *) snd->source, tr_state);
}
tr_state->sound_holder = NULL;
}
