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3d sound diminishes with distance.

This commit is contained in:
Rok Mandeljc 2003-01-10 01:46:36 +00:00 committed by Alexandre Julliard
parent 7cf87c521e
commit 438985f3dd
1 changed files with 46 additions and 15 deletions
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53
dlls/dsound/sound3d.c
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@ -103,28 +103,27 @@ static inline D3DVALUE VectorMagnitude (LPD3DVECTOR a)
}
/* conversion between radians and degrees */
static inline LONG RadToDeg (LONG angle)
static inline DWORD RadToDeg (DWORD angle)
{
LONG newangle;
DWORD newangle;
newangle = angle * (360/(2*M_PI));
TRACE("%ld rad = %ld deg\n", angle, newangle);
return newangle;
}
/* conversion between degrees and radians */
static inline LONG DegToRad (LONG angle)
static inline DWORD DegToRad (DWORD angle)
{
LONG newangle;
DWORD newangle;
newangle = angle * (2*M_PI/360);
TRACE("%ld deg = %ld rad\n", angle, newangle);
return newangle;
}
/* angle between vectors */
static inline LONG AngleBetweenVectorsDeg (LPD3DVECTOR a, LPD3DVECTOR b)
static inline DWORD AngleBetweenVectorsDeg (LPD3DVECTOR a, LPD3DVECTOR b)
{
LONG angle;
LONG cos;
DWORD angle, cos;
D3DVALUE la, lb, product;
/* definition of scalar product: a*b = |a|*|b|*cos...therefore: */
product = ScalarProduct (a,b);
@ -132,7 +131,7 @@ static inline LONG AngleBetweenVectorsDeg (LPD3DVECTOR a, LPD3DVECTOR b)
lb = VectorMagnitude (b);
cos = product/(la*lb);
/* we now have angle in radians */
angle = DegToRad(cos);
angle = RadToDeg(cos);
TRACE("angle between (%f,%f,%f) and (%f,%f,%f) = %ld degrees\n", a->u1.x, a->u2.y, a->u3.z, b->u1.x, \
b->u2.y, b->u3.z, angle);
return angle;
@ -157,6 +156,13 @@ static inline D3DVECTOR VectorBetweenTwoPoints (LPD3DVECTOR a, LPD3DVECTOR b)
static void WINAPI DSOUND_Mix3DBuffer(IDirectSound3DBufferImpl *ds3db)
{
IDirectSound3DListenerImpl *dsl;
/* volume, at which the sound will be played after all calcs. */
LONG lVolume;
/* attuneation (temp variable) */
LONG lAttuneation;
int iPower;
/* stuff for distance related stuff calc. */
D3DVECTOR vDistance;
D3DVALUE fDistance;
@ -169,25 +175,50 @@ static void WINAPI DSOUND_Mix3DBuffer(IDirectSound3DBufferImpl *ds3db)
{
case DS3DMODE_NORMAL:
{
/* initial volume */
lVolume = ds3db->lVolume;
/* distance attuneation stuff */
vDistance = VectorBetweenTwoPoints(&ds3db->ds3db.vPosition, &dsl->ds3dl.vPosition);
fDistance = VectorMagnitude (&vDistance);
if (fDistance > ds3db->ds3db.flMaxDistance)
{
/* some apps don't want you too hear too distant sounds... */
/* some apps don't want you to hear too distant sounds... */
if (ds3db->dsb->dsbd.dwFlags & DSBCAPS_MUTE3DATMAXDISTANCE)
{
ds3db->dsb->volpan.lVolume = DSBVOLUME_MIN;
DSOUND_RecalcVolPan (&ds3db->dsb->volpan);
DSOUND_ForceRemix (ds3db->dsb);
/* i guess mixing here would be a waste of power */
return;
}
else
fDistance = ds3db->ds3db.flMaxDistance;
}
ds3db->dsb->volpan.lVolume = DSBVOLUME_MAX;
if (fDistance < ds3db->ds3db.flMinDistance)
fDistance = ds3db->ds3db.flMinDistance;
/* the formula my dad and i have figured out after reading msdn info about min/max distance
...hope it works */
iPower = fDistance/ds3db->ds3db.flMinDistance - 1; /* this sucks, but for unknown reason damn thing works only if you reduce it for 1 */
lAttuneation = (((pow(2, iPower) - 1)*DSBVOLUME_MIN) + lVolume)/pow(2, iPower);
lAttuneation /= 5; /* i've figured this value wih trying (without it, sound is too quiet */
TRACE ("distance att.: distance = %f, min distance = %f => adjusting volume %ld for attuneation %ld\n", fDistance, ds3db->ds3db.flMinDistance, lVolume, lAttuneation);
lVolume = lVolume + lAttuneation;
/* conning */
/* at least, we got the desired volume */
ds3db->dsb->volpan.lVolume = lVolume;
DSOUND_RecalcVolPan (&ds3db->dsb->volpan);
DSOUND_ForceRemix (ds3db->dsb);
break;
}
case DS3DMODE_HEADRELATIVE:
case DS3DMODE_DISABLE:
DSOUND_RecalcVolPan (&ds3db->dsb->volpan);
DSOUND_ForceRemix (ds3db->dsb);
break;
}
}