// Perform the non-EAX reverb pass on a given input sample, resulting in
// four-channel output.
static __inline ALvoid VerbPass(ALverbState *State, ALfloat in, ALfloat *early, ALfloat *late)
{
ALfloat feed, taps[4];
// Low-pass filter the incoming sample.
in = lpFilter2P(&State->LpFilter, 0, in);
// Feed the initial delay line.
DelayLineIn(&State->Delay, State->Offset, in);
// Calculate the early reflection from the first delay tap.
in = DelayLineOut(&State->Delay, State->Offset - State->DelayTap[0]);
EarlyReflection(State, in, early);
// Feed the decorrelator from the energy-attenuated output of the second
// delay tap.
in = DelayLineOut(&State->Delay, State->Offset - State->DelayTap[1]);
feed = in * State->Late.DensityGain;
DelayLineIn(&State->Decorrelator, State->Offset, feed);
// Calculate the late reverb from the decorrelator taps.
taps[0] = feed;
taps[1] = DelayLineOut(&State->Decorrelator, State->Offset - State->DecoTap[0]);
taps[2] = DelayLineOut(&State->Decorrelator, State->Offset - State->DecoTap[1]);
taps[3] = DelayLineOut(&State->Decorrelator, State->Offset - State->DecoTap[2]);
LateReverb(State, taps, late);
// Step all delays forward one sample.
State->Offset++;
}
static void VerbPass(IDirectSoundBufferImpl* dsb, float in, float* out)
{
float feed, late[4], taps[4];
/* Low-pass filter the incoming sample. */
in = lpFilter2P(&dsb->eax.LpFilter, 0, in);
/* Feed the initial delay line. */
DelayLineIn(&dsb->eax.Delay, dsb->eax.Offset, in);
/* Calculate the early reflection from the first delay tap. */
in = DelayLineOut(&dsb->eax.Delay, dsb->eax.Offset - dsb->eax.DelayTap[0]);
EarlyReflection(dsb, in, out);
/* Feed the decorrelator from the energy-attenuated output of the second
* delay tap. */
in = DelayLineOut(&dsb->eax.Delay, dsb->eax.Offset - dsb->eax.DelayTap[1]);
feed = in * dsb->eax.Late.DensityGain;
DelayLineIn(&dsb->eax.Decorrelator, dsb->eax.Offset, feed);
/* Calculate the late reverb from the decorrelator taps. */
taps[0] = feed;
taps[1] = DelayLineOut(&dsb->eax.Decorrelator, dsb->eax.Offset - dsb->eax.DecoTap[0]);
taps[2] = DelayLineOut(&dsb->eax.Decorrelator, dsb->eax.Offset - dsb->eax.DecoTap[1]);
taps[3] = DelayLineOut(&dsb->eax.Decorrelator, dsb->eax.Offset - dsb->eax.DecoTap[2]);
LateReverb(dsb, taps, late);
/* Mix early reflections and late reverb. */
out[0] += late[0];
out[1] += late[1];
out[2] += late[2];
out[3] += late[3];
/* Step all delays forward one sample. */
dsb->eax.Offset++;
}
