// This processes the reverb state, given the input samples and an output
// buffer.
static ALvoid VerbProcess(ALeffectState *effect, const ALeffectslot *Slot, ALuint SamplesToDo, const ALfloat *SamplesIn, ALfloat (*SamplesOut)[MAXCHANNELS])
{
ALverbState *State = (ALverbState*)effect;
ALuint index;
ALfloat early[4], late[4], out[4];
const ALfloat *panGain = State->Gain;
(void)Slot;
for(index = 0;index < SamplesToDo;index++)
{
// Process reverb for this sample.
VerbPass(State, SamplesIn[index], early, late);
// Mix early reflections and late reverb.
out[0] = (early[0] + late[0]);
out[1] = (early[1] + late[1]);
out[2] = (early[2] + late[2]);
out[3] = (early[3] + late[3]);
// Output the results.
SamplesOut[index][FRONT_LEFT] += panGain[FRONT_LEFT] * out[0];
SamplesOut[index][FRONT_RIGHT] += panGain[FRONT_RIGHT] * out[1];
SamplesOut[index][FRONT_CENTER] += panGain[FRONT_CENTER] * out[3];
SamplesOut[index][SIDE_LEFT] += panGain[SIDE_LEFT] * out[0];
SamplesOut[index][SIDE_RIGHT] += panGain[SIDE_RIGHT] * out[1];
SamplesOut[index][BACK_LEFT] += panGain[BACK_LEFT] * out[0];
SamplesOut[index][BACK_RIGHT] += panGain[BACK_RIGHT] * out[1];
SamplesOut[index][BACK_CENTER] += panGain[BACK_CENTER] * out[2];
}
}
void process_eax_buffer(IDirectSoundBufferImpl *dsb, float *buf, DWORD count)
{
int i;
float* out;
float gain;
if (dsb->device->eax.volume == 0.0f)
return;
if (dsb->mix_channels > 1) {
WARN("EAX not yet supported for non-mono sources\n");
return;
}
if (dsb->eax.reverb_update) {
dsb->eax.reverb_update = FALSE;
ReverbUpdate(dsb);
}
out = HeapAlloc(GetProcessHeap(), 0, sizeof(float)*count*4);
for (i = 0; i < count; i++) {
VerbPass(dsb, buf[i], &out[i*4]);
}
if (dsb->eax.reverb_mix == EAX_REVERBMIX_USEDISTANCE)
gain = 1.0f; /* FIXME - should be calculated from distance */
else
gain = dsb->eax.reverb_mix;
for (i = 0; i < count; i++) {
buf[i] += gain * out[i*4];
}
HeapFree(GetProcessHeap(), 0, out);
}
