static ALvoid DedicatedUpdate(ALeffectState *effect, ALCcontext *Context, const ALeffectslot *Slot)
{
ALdedicatedState *state = (ALdedicatedState*)effect;
ALCdevice *device = Context->Device;
const ALfloat *SpeakerGain;
ALfloat Gain;
ALint pos;
ALsizei s;
Gain = Slot->Gain * Slot->effect.Dedicated.Gain;
for(s = 0;s < MAXCHANNELS;s++)
state->gains[s] = 0.0f;
if(Slot->effect.type == AL_EFFECT_DEDICATED_DIALOGUE)
{
pos = aluCart2LUTpos(1.0f, 0.0f);
SpeakerGain = device->PanningLUT[pos];
for(s = 0;s < MAXCHANNELS;s++)
state->gains[s] = SpeakerGain[s] * Gain;
}
else if(Slot->effect.type == AL_EFFECT_DEDICATED_LOW_FREQUENCY_EFFECT)
state->gains[LFE] = Gain;
}
// Update the early and late 3D panning gains.
static ALvoid Update3DPanning(const ALCdevice *Device, const ALfloat *ReflectionsPan, const ALfloat *LateReverbPan, ALfloat Gain, ALverbState *State)
{
ALfloat earlyPan[3] = { ReflectionsPan[0], ReflectionsPan[1],
ReflectionsPan[2] };
ALfloat latePan[3] = { LateReverbPan[0], LateReverbPan[1],
LateReverbPan[2] };
const ALfloat *speakerGain;
ALfloat ambientGain;
ALfloat dirGain;
ALfloat length;
ALuint index;
ALint pos;
Gain *= ReverbBoost;
// Attenuate non-directional reverb according to the number of channels
ambientGain = aluSqrt(2.0f/Device->NumChan);
// Calculate the 3D-panning gains for the early reflections and late
// reverb.
length = earlyPan[0]*earlyPan[0] + earlyPan[1]*earlyPan[1] + earlyPan[2]*earlyPan[2];
if(length > 1.0f)
{
length = 1.0f / aluSqrt(length);
earlyPan[0] *= length;
earlyPan[1] *= length;
earlyPan[2] *= length;
}
length = latePan[0]*latePan[0] + latePan[1]*latePan[1] + latePan[2]*latePan[2];
if(length > 1.0f)
{
length = 1.0f / aluSqrt(length);
latePan[0] *= length;
latePan[1] *= length;
latePan[2] *= length;
}
/* This code applies directional reverb just like the mixer applies
* directional sources. It diffuses the sound toward all speakers as the
* magnitude of the panning vector drops, which is only a rough
* approximation of the expansion of sound across the speakers from the
* panning direction.
*/
pos = aluCart2LUTpos(earlyPan[2], earlyPan[0]);
speakerGain = Device->PanningLUT[pos];
dirGain = aluSqrt((earlyPan[0] * earlyPan[0]) + (earlyPan[2] * earlyPan[2]));
for(index = 0;index < MAXCHANNELS;index++)
State->Early.PanGain[index] = 0.0f;
for(index = 0;index < Device->NumChan;index++)
{
enum Channel chan = Device->Speaker2Chan[index];
State->Early.PanGain[chan] = lerp(ambientGain, speakerGain[chan], dirGain) * Gain;
}
pos = aluCart2LUTpos(latePan[2], latePan[0]);
speakerGain = Device->PanningLUT[pos];
dirGain = aluSqrt((latePan[0] * latePan[0]) + (latePan[2] * latePan[2]));
for(index = 0;index < MAXCHANNELS;index++)
State->Late.PanGain[index] = 0.0f;
for(index = 0;index < Device->NumChan;index++)
{
enum Channel chan = Device->Speaker2Chan[index];
State->Late.PanGain[chan] = lerp(ambientGain, speakerGain[chan], dirGain) * Gain;
}
}
// Update the early and late 3D panning gains.
static ALvoid Update3DPanning( const ALfloat* ReflectionsPan, const ALfloat* LateReverbPan, ALfloat* PanningLUT, ALverbState* State )
{
ALfloat length;
ALfloat earlyPan[3] = { ReflectionsPan[0], ReflectionsPan[1],
ReflectionsPan[2]
};
ALfloat latePan[3] = { LateReverbPan[0], LateReverbPan[1],
LateReverbPan[2]
};
ALint pos;
ALfloat* speakerGain, dirGain, ambientGain;
ALuint index;
// Calculate the 3D-panning gains for the early reflections and late
// reverb.
length = earlyPan[0] * earlyPan[0] + earlyPan[1] * earlyPan[1] + earlyPan[2] * earlyPan[2];
if ( length > 1.0f )
{
length = 1.0f / aluSqrt( length );
earlyPan[0] *= length;
earlyPan[1] *= length;
earlyPan[2] *= length;
}
length = latePan[0] * latePan[0] + latePan[1] * latePan[1] + latePan[2] * latePan[2];
if ( length > 1.0f )
{
length = 1.0f / aluSqrt( length );
latePan[0] *= length;
latePan[1] *= length;
latePan[2] *= length;
}
/* This code applies directional reverb just like the mixer applies
* directional sources. It diffuses the sound toward all speakers as the
* magnitude of the panning vector drops, which is only a rough
* approximation of the expansion of sound across the speakers from the
* panning direction.
*/
pos = aluCart2LUTpos( earlyPan[2], earlyPan[0] );
speakerGain = &PanningLUT[OUTPUTCHANNELS * pos];
dirGain = aluSqrt( ( earlyPan[0] * earlyPan[0] ) + ( earlyPan[2] * earlyPan[2] ) );
ambientGain = ( 1.0 - dirGain );
for ( index = 0; index < OUTPUTCHANNELS; index++ )
{
State->Early.PanGain[index] = dirGain * speakerGain[index] + ambientGain;
}
pos = aluCart2LUTpos( latePan[2], latePan[0] );
speakerGain = &PanningLUT[OUTPUTCHANNELS * pos];
dirGain = aluSqrt( ( latePan[0] * latePan[0] ) + ( latePan[2] * latePan[2] ) );
ambientGain = ( 1.0 - dirGain );
for ( index = 0; index < OUTPUTCHANNELS; index++ )
{
State->Late.PanGain[index] = dirGain * speakerGain[index] + ambientGain;
}
}
