/*
* Performance stereo spatialization
* of a channel in the frontends
* sense.
*/
static void
AL_Spatialize(channel_t *ch)
{
vec3_t origin;
/* anything coming from the view entity
will always be full volume. no
attenuation = no spatialization */
if ((ch->entnum == -1) || (ch->entnum == cl.playernum + 1) ||
!ch->dist_mult)
{
VectorCopy(listener_origin, origin);
}
else if (ch->fixed_origin)
{
VectorCopy(ch->origin, origin);
}
else
{
CL_GetEntitySoundOrigin(ch->entnum, origin);
}
qalSource3f(ch->srcnum, AL_POSITION, AL_UnpackVector(origin));
}
/*
==================
S_AddLoopSounds
Entities with a ->sound field will generated looped sounds
that are automatically started, stopped, and merged together
as the entities are sent to the client
==================
*/
static void S_AddLoopSounds (void)
{
int i, j;
int sounds[MAX_EDICTS];
int left, right, left_total, right_total;
channel_t *ch;
sfx_t *sfx;
sfxcache_t *sc;
int num;
entity_state_t *ent;
vec3_t origin;
if (cl_paused->integer || cls.state != ca_active || !cl.sound_prepped)
return;
for (i=0 ; i<cl.frame.num_entities ; i++)
{
num = (cl.frame.parse_entities + i) & PARSE_ENTITIES_MASK;
ent = &cl_parse_entities[num];
sounds[i] = ent->sound;
}
for (i=0 ; i<cl.frame.num_entities ; i++)
{
if (!sounds[i])
continue;
sfx = cl.sound_precache[sounds[i]];
if (!sfx)
continue; // bad sound effect
sc = sfx->cache;
if (!sc || sc->length <= 0)
continue;
num = (cl.frame.parse_entities + i) & PARSE_ENTITIES_MASK;
ent = &cl_parse_entities[num];
CL_GetEntitySoundOrigin (ent->number, origin);
// find the total contribution of all sounds of this type
S_SpatializeOrigin (origin, 255.0f, SOUND_LOOPATTENUATE,
&left_total, &right_total);
for (j=i+1 ; j<cl.frame.num_entities ; j++)
{
if (sounds[j] != sounds[i])
continue;
sounds[j] = 0; // don't check this again later
num = (cl.frame.parse_entities + j) & PARSE_ENTITIES_MASK;
ent = &cl_parse_entities[num];
S_SpatializeOrigin (ent->origin, 255.0f, SOUND_LOOPATTENUATE,
&left, &right);
left_total += left;
right_total += right;
}
if (left_total == 0 && right_total == 0)
continue; // not audible
// allocate a channel
ch = S_PickChannel(0, 0);
if (!ch)
return;
if (left_total > 255)
left_total = 255;
if (right_total > 255)
right_total = 255;
ch->leftvol = left_total;
ch->rightvol = right_total;
ch->autosound = true; // remove next frame
ch->sfx = sfx;
ch->pos = paintedtime % sc->length;
ch->end = paintedtime + sc->length - ch->pos;
}
}