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dsound: Fix rolloff factor calculation. 

We should treat the rolloff factor as a factor of the distance of the
buffer. For example, a rolloff factor of 2 should treat the buffer as if
it were twice as far away from the listener as it is.

The previous calculation would instead double the decibels of
attenuation.

Signed-off-by: Andrew Eikum <aeikum@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Andrew Eikum 2016-12-28 14:02:54 -06:00 committed by Alexandre Julliard
parent c0b30432ea
commit 1671a83f55
1 changed files with 3 additions and 1 deletions
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4
dlls/dsound/sound3d.c
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@ -206,8 +206,10 @@ void DSOUND_Calc3DBuffer(IDirectSoundBufferImpl *dsb)
if (flDistance < dsb->ds3db_ds3db.flMinDistance)
flDistance = dsb->ds3db_ds3db.flMinDistance;
flDistance = dsb->ds3db_ds3db.flMinDistance + (flDistance - dsb->ds3db_ds3db.flMinDistance) * dsb->device->ds3dl.flRolloffFactor;
/* attenuation proportional to the distance squared, converted to millibels as in lVolume*/
lVolume -= log10(flDistance/dsb->ds3db_ds3db.flMinDistance * flDistance/dsb->ds3db_ds3db.flMinDistance)*1000 * dsb->device->ds3dl.flRolloffFactor;
lVolume -= log10(flDistance/dsb->ds3db_ds3db.flMinDistance * flDistance/dsb->ds3db_ds3db.flMinDistance)*1000;
TRACE("dist. att: Distance = %f, MinDistance = %f => adjusting volume %d to %f\n", flDistance, dsb->ds3db_ds3db.flMinDistance, dsb->ds3db_lVolume, lVolume);
/* conning */