static ALvoid CalcListenerParams(ALlistener *Listener)
{
ALfloat N[3], V[3], U[3];
aluVector P;
/* AT then UP */
N[0] = Listener->Forward[0];
N[1] = Listener->Forward[1];
N[2] = Listener->Forward[2];
aluNormalize(N);
V[0] = Listener->Up[0];
V[1] = Listener->Up[1];
V[2] = Listener->Up[2];
aluNormalize(V);
/* Build and normalize right-vector */
aluCrossproduct(N, V, U);
aluNormalize(U);
P = Listener->Position;
aluMatrixSet(&Listener->Params.Matrix,
U[0], V[0], -N[0], 0.0f,
U[1], V[1], -N[1], 0.0f,
U[2], V[2], -N[2], 0.0f,
0.0f, 0.0f, 0.0f, 1.0f
);
aluMatrixVector(&P, &Listener->Params.Matrix);
aluMatrixSetRow(&Listener->Params.Matrix, 3, -P.v[0], -P.v[1], -P.v[2], 1.0f);
Listener->Params.Velocity = Listener->Velocity;
aluMatrixVector(&Listener->Params.Velocity, &Listener->Params.Matrix);
}
ALUAPI ALvoid ALUAPIENTRY aluCalculateSourceParameters(ALuint source,ALuint freqOutput,ALuint numOutputChannels,ALfloat *drysend,ALfloat *wetsend,ALfloat *pitch)
{
ALfloat ListenerOrientation[6],ListenerPosition[3],ListenerVelocity[3];
ALfloat InnerAngle,OuterAngle,OuterGain,Angle,Distance,DryMix,WetMix;
ALfloat Direction[3],Position[3],Velocity[3],SourceToListener[3];
ALfloat MinVolume,MaxVolume,MinDist,MaxDist,Rolloff;
ALfloat Pitch,ConeVolume,SourceVolume,PanningFB,PanningLR,ListenerGain;
ALuint NumBufferChannels;
ALfloat U[3],V[3],N[3];
ALfloat DopplerFactor, DopplerVelocity, flSpeedOfSound, flMaxVelocity;
ALfloat flVSS, flVLS;
ALuint DistanceModel;
ALfloat Matrix[3][3];
ALint HeadRelative;
ALuint Buffer;
ALenum Error;
ALfloat flAttenuation;
if (alIsSource(source))
{
//Get global properties
alGetFloatv(AL_DOPPLER_FACTOR,&DopplerFactor);
alGetIntegerv(AL_DISTANCE_MODEL,&DistanceModel);
alGetFloatv(AL_DOPPLER_VELOCITY,&DopplerVelocity);
alGetFloatv(AL_SPEED_OF_SOUND,&flSpeedOfSound);
//Get listener properties
alGetListenerfv(AL_GAIN,&ListenerGain);
alGetListenerfv(AL_POSITION,ListenerPosition);
alGetListenerfv(AL_VELOCITY,ListenerVelocity);
alGetListenerfv(AL_ORIENTATION,ListenerOrientation);
//Get source properties
alGetSourcef(source,AL_PITCH,&Pitch);
alGetSourcef(source,AL_GAIN,&SourceVolume);
alGetSourcei(source,AL_BUFFER,&Buffer);
alGetSourcefv(source,AL_POSITION,Position);
alGetSourcefv(source,AL_VELOCITY,Velocity);
alGetSourcefv(source,AL_DIRECTION,Direction);
alGetSourcef(source,AL_MIN_GAIN,&MinVolume);
alGetSourcef(source,AL_MAX_GAIN,&MaxVolume);
alGetSourcef(source,AL_REFERENCE_DISTANCE,&MinDist);
alGetSourcef(source,AL_MAX_DISTANCE,&MaxDist);
alGetSourcef(source,AL_ROLLOFF_FACTOR,&Rolloff);
alGetSourcef(source,AL_CONE_OUTER_GAIN,&OuterGain);
alGetSourcef(source,AL_CONE_INNER_ANGLE,&InnerAngle);
alGetSourcef(source,AL_CONE_OUTER_ANGLE,&OuterAngle);
alGetSourcei(source,AL_SOURCE_RELATIVE,&HeadRelative);
//Set working variables
DryMix=(ALfloat)(1.0f);
WetMix=(ALfloat)(0.0f);
//Get buffer properties
alGetBufferi(Buffer,AL_CHANNELS,&NumBufferChannels);
//Only apply 3D calculations for mono buffers
if (NumBufferChannels==1)
{
//1. Translate Listener to origin (convert to head relative)
if (HeadRelative==AL_FALSE)
{
Position[0]-=ListenerPosition[0];
Position[1]-=ListenerPosition[1];
Position[2]-=ListenerPosition[2];
}
//2. Calculate distance attenuation
Distance=(ALfloat)sqrt(aluDotproduct(Position,Position));
// Clamp to MinDist and MaxDist if appropriate
if ((DistanceModel == AL_INVERSE_DISTANCE_CLAMPED) ||
(DistanceModel == AL_LINEAR_DISTANCE_CLAMPED) ||
(DistanceModel == AL_EXPONENT_DISTANCE_CLAMPED))
{
Distance=(Distance<MinDist?MinDist:Distance);
Distance=(Distance>MaxDist?MaxDist:Distance);
}
flAttenuation = 1.0f;
switch (DistanceModel)
{
case AL_INVERSE_DISTANCE:
if (MinDist > 0.0f)
{
if ((MinDist + (Rolloff * (Distance - MinDist))) > 0.0f)
flAttenuation = MinDist / (MinDist + (Rolloff * (Distance - MinDist)));
else
flAttenuation = 1000000;
}
break;
case AL_INVERSE_DISTANCE_CLAMPED:
if ((MaxDist >= MinDist) && (MinDist > 0.0f))
{
if ((MinDist + (Rolloff * (Distance - MinDist))) > 0.0f)
flAttenuation = MinDist / (MinDist + (Rolloff * (Distance - MinDist)));
else
flAttenuation = 1000000;
}
break;
case AL_LINEAR_DISTANCE:
if (MaxDist != MinDist)
flAttenuation = 1.0f - (Rolloff*(Distance-MinDist)/(MaxDist - MinDist));
break;
case AL_LINEAR_DISTANCE_CLAMPED:
if (MaxDist > MinDist)
flAttenuation = 1.0f - (Rolloff*(Distance-MinDist)/(MaxDist - MinDist));
break;
case AL_EXPONENT_DISTANCE:
if ((Distance > 0.0f) && (MinDist > 0.0f))
flAttenuation = (ALfloat)pow(Distance/MinDist, -Rolloff);
break;
case AL_EXPONENT_DISTANCE_CLAMPED:
if ((MaxDist >= MinDist) && (Distance > 0.0f) && (MinDist > 0.0f))
flAttenuation = (ALfloat)pow(Distance/MinDist, -Rolloff);
break;
case AL_NONE:
default:
flAttenuation = 1.0f;
break;
}
// Source Gain + Attenuation
DryMix = SourceVolume * flAttenuation;
// Clamp to Min/Max Gain
DryMix=__min(DryMix,MaxVolume);
DryMix=__max(DryMix,MinVolume);
WetMix=__min(WetMix,MaxVolume);
WetMix=__max(WetMix,MinVolume);
//3. Apply directional soundcones
SourceToListener[0]=-Position[0];
SourceToListener[1]=-Position[1];
SourceToListener[2]=-Position[2];
aluNormalize(Direction);
aluNormalize(SourceToListener);
Angle=(ALfloat)(180.0*acos(aluDotproduct(Direction,SourceToListener))/3.141592654f);
if ((Angle>=InnerAngle)&&(Angle<=OuterAngle))
ConeVolume=(1.0f+(OuterGain-1.0f)*(Angle-InnerAngle)/(OuterAngle-InnerAngle));
else if (Angle>OuterAngle)
ConeVolume=(1.0f+(OuterGain-1.0f) );
else
ConeVolume=1.0f;
//4. Calculate Velocity
if (DopplerFactor != 0.0f)
{
flVLS = aluDotproduct(ListenerVelocity, SourceToListener);
flVSS = aluDotproduct(Velocity, SourceToListener);
flMaxVelocity = (DopplerVelocity * flSpeedOfSound) / DopplerFactor;
if (flVSS >= flMaxVelocity)
flVSS = (flMaxVelocity - 1.0f);
else if (flVSS <= -flMaxVelocity)
flVSS = -flMaxVelocity + 1.0f;
if (flVLS >= flMaxVelocity)
flVLS = (flMaxVelocity - 1.0f);
else if (flVLS <= -flMaxVelocity)
flVLS = -flMaxVelocity + 1.0f;
pitch[0] = Pitch * ((flSpeedOfSound * DopplerVelocity) - (DopplerFactor * flVLS)) /
((flSpeedOfSound * DopplerVelocity) - (DopplerFactor * flVSS));
}
else
{
pitch[0] = Pitch;
}
//5. Align coordinate system axes
aluCrossproduct(&ListenerOrientation[0],&ListenerOrientation[3],U); // Right-vector
aluNormalize(U); // Normalized Right-vector
memcpy(V,&ListenerOrientation[3],sizeof(V)); // Up-vector
aluNormalize(V); // Normalized Up-vector
memcpy(N,&ListenerOrientation[0],sizeof(N)); // At-vector
aluNormalize(N); // Normalized At-vector
Matrix[0][0]=U[0]; Matrix[0][1]=V[0]; Matrix[0][2]=-N[0];
Matrix[1][0]=U[1]; Matrix[1][1]=V[1]; Matrix[1][2]=-N[1];
Matrix[2][0]=U[2]; Matrix[2][1]=V[2]; Matrix[2][2]=-N[2];
aluMatrixVector(Position,Matrix);
//6. Convert normalized position into font/back panning
if (Distance != 0.0f)
{
aluNormalize(Position);
PanningLR=(0.5f+0.5f*Position[0]);
PanningFB=(0.5f+0.5f*Position[2]);
}
else
{
PanningLR=0.5f;
PanningFB=0.5f;
}
//7. Convert front/back panning into channel volumes
switch (numOutputChannels)
{
case 1:
drysend[0]=(ConeVolume*ListenerGain*DryMix*(ALfloat)1.0f ); //Direct
wetsend[0]=(ListenerGain*WetMix*(ALfloat)1.0f ); //Room
break;
case 2:
drysend[0]=(ConeVolume*ListenerGain*DryMix*(ALfloat)sqrt((1.0f-PanningLR))); //FL Direct
drysend[1]=(ConeVolume*ListenerGain*DryMix*(ALfloat)sqrt(( PanningLR))); //FR Direct
wetsend[0]=( ListenerGain*WetMix*(ALfloat)sqrt((1.0f-PanningLR))); //FL Room
wetsend[1]=( ListenerGain*WetMix*(ALfloat)sqrt(( PanningLR))); //FR Room
break;
default:
break;
}
}
else
{
//1. Stereo buffers always play from front left/front right
switch (numOutputChannels)
{
case 1:
drysend[0]=(SourceVolume*1.0f*ListenerGain);
wetsend[0]=(SourceVolume*0.0f*ListenerGain);
break;
case 2:
drysend[0]=(SourceVolume*1.0f*ListenerGain);
drysend[1]=(SourceVolume*1.0f*ListenerGain);
wetsend[0]=(SourceVolume*0.0f*ListenerGain);
wetsend[1]=(SourceVolume*0.0f*ListenerGain);
break;
default:
break;
}
pitch[0]=(ALfloat)(Pitch);
}
Error=alGetError();
}
}
ALvoid CalcSourceParams(ALvoice *voice, const ALsource *ALSource, const ALCcontext *ALContext)
{
ALCdevice *Device = ALContext->Device;
aluVector Position, Velocity, Direction, SourceToListener;
ALfloat InnerAngle,OuterAngle,Angle,Distance,ClampedDist;
ALfloat MinVolume,MaxVolume,MinDist,MaxDist,Rolloff;
ALfloat ConeVolume,ConeHF,SourceVolume,ListenerGain;
ALfloat DopplerFactor, SpeedOfSound;
ALfloat AirAbsorptionFactor;
ALfloat RoomAirAbsorption[MAX_SENDS];
ALbufferlistitem *BufferListItem;
ALfloat Attenuation;
ALfloat RoomAttenuation[MAX_SENDS];
ALfloat MetersPerUnit;
ALfloat RoomRolloffBase;
ALfloat RoomRolloff[MAX_SENDS];
ALfloat DecayDistance[MAX_SENDS];
ALfloat DryGain;
ALfloat DryGainHF;
ALfloat DryGainLF;
ALboolean DryGainHFAuto;
ALfloat WetGain[MAX_SENDS];
ALfloat WetGainHF[MAX_SENDS];
ALfloat WetGainLF[MAX_SENDS];
ALboolean WetGainAuto;
ALboolean WetGainHFAuto;
ALfloat Pitch;
ALuint Frequency;
ALint NumSends;
ALint i, j;
DryGainHF = 1.0f;
DryGainLF = 1.0f;
for(i = 0;i < MAX_SENDS;i++)
{
WetGainHF[i] = 1.0f;
WetGainLF[i] = 1.0f;
}
/* Get context/device properties */
DopplerFactor = ALContext->DopplerFactor * ALSource->DopplerFactor;
SpeedOfSound = ALContext->SpeedOfSound * ALContext->DopplerVelocity;
NumSends = Device->NumAuxSends;
Frequency = Device->Frequency;
/* Get listener properties */
ListenerGain = ALContext->Listener->Gain;
MetersPerUnit = ALContext->Listener->MetersPerUnit;
/* Get source properties */
SourceVolume = ALSource->Gain;
MinVolume = ALSource->MinGain;
MaxVolume = ALSource->MaxGain;
Pitch = ALSource->Pitch;
Position = ALSource->Position;
Direction = ALSource->Direction;
Velocity = ALSource->Velocity;
MinDist = ALSource->RefDistance;
MaxDist = ALSource->MaxDistance;
Rolloff = ALSource->RollOffFactor;
InnerAngle = ALSource->InnerAngle;
OuterAngle = ALSource->OuterAngle;
AirAbsorptionFactor = ALSource->AirAbsorptionFactor;
DryGainHFAuto = ALSource->DryGainHFAuto;
WetGainAuto = ALSource->WetGainAuto;
WetGainHFAuto = ALSource->WetGainHFAuto;
RoomRolloffBase = ALSource->RoomRolloffFactor;
voice->Direct.OutBuffer = Device->DryBuffer;
voice->Direct.OutChannels = Device->NumChannels;
for(i = 0;i < NumSends;i++)
{
ALeffectslot *Slot = ALSource->Send[i].Slot;
if(!Slot && i == 0)
Slot = Device->DefaultSlot;
if(!Slot || Slot->EffectType == AL_EFFECT_NULL)
{
Slot = NULL;
RoomRolloff[i] = 0.0f;
DecayDistance[i] = 0.0f;
RoomAirAbsorption[i] = 1.0f;
}
else if(Slot->AuxSendAuto)
{
RoomRolloff[i] = RoomRolloffBase;
if(IsReverbEffect(Slot->EffectType))
{
RoomRolloff[i] += Slot->EffectProps.Reverb.RoomRolloffFactor;
DecayDistance[i] = Slot->EffectProps.Reverb.DecayTime *
SPEEDOFSOUNDMETRESPERSEC;
RoomAirAbsorption[i] = Slot->EffectProps.Reverb.AirAbsorptionGainHF;
}
else
{
DecayDistance[i] = 0.0f;
RoomAirAbsorption[i] = 1.0f;
}
}
else
{
/* If the slot's auxiliary send auto is off, the data sent to the
* effect slot is the same as the dry path, sans filter effects */
RoomRolloff[i] = Rolloff;
DecayDistance[i] = 0.0f;
RoomAirAbsorption[i] = AIRABSORBGAINHF;
}
if(!Slot || Slot->EffectType == AL_EFFECT_NULL)
voice->Send[i].OutBuffer = NULL;
else
voice->Send[i].OutBuffer = Slot->WetBuffer;
}
/* Transform source to listener space (convert to head relative) */
if(ALSource->HeadRelative == AL_FALSE)
{
const aluMatrix *Matrix = &ALContext->Listener->Params.Matrix;
/* Transform source vectors */
aluMatrixVector(&Position, Matrix);
aluMatrixVector(&Velocity, Matrix);
aluMatrixVector(&Direction, Matrix);
}
else
{
const aluVector *lvelocity = &ALContext->Listener->Params.Velocity;
/* Offset the source velocity to be relative of the listener velocity */
Velocity.v[0] += lvelocity->v[0];
Velocity.v[1] += lvelocity->v[1];
Velocity.v[2] += lvelocity->v[2];
}
aluNormalize(Direction.v);
SourceToListener.v[0] = -Position.v[0];
SourceToListener.v[1] = -Position.v[1];
SourceToListener.v[2] = -Position.v[2];
SourceToListener.v[3] = 0.0f;
Distance = aluNormalize(SourceToListener.v);
/* Calculate distance attenuation */
ClampedDist = Distance;
Attenuation = 1.0f;
for(i = 0;i < NumSends;i++)
RoomAttenuation[i] = 1.0f;
switch(ALContext->SourceDistanceModel ? ALSource->DistanceModel :
ALContext->DistanceModel)
{
case InverseDistanceClamped:
ClampedDist = clampf(ClampedDist, MinDist, MaxDist);
if(MaxDist < MinDist)
break;
/*fall-through*/
case InverseDistance:
if(MinDist > 0.0f)
{
ALfloat dist = lerp(MinDist, ClampedDist, Rolloff);
if(dist > 0.0f) Attenuation = MinDist / dist;
for(i = 0;i < NumSends;i++)
{
dist = lerp(MinDist, ClampedDist, RoomRolloff[i]);
if(dist > 0.0f) RoomAttenuation[i] = MinDist / dist;
}
}
break;
case LinearDistanceClamped:
ClampedDist = clampf(ClampedDist, MinDist, MaxDist);
if(MaxDist < MinDist)
break;
/*fall-through*/
case LinearDistance:
if(MaxDist != MinDist)
{
Attenuation = 1.0f - (Rolloff*(ClampedDist-MinDist)/(MaxDist - MinDist));
Attenuation = maxf(Attenuation, 0.0f);
for(i = 0;i < NumSends;i++)
{
RoomAttenuation[i] = 1.0f - (RoomRolloff[i]*(ClampedDist-MinDist)/(MaxDist - MinDist));
RoomAttenuation[i] = maxf(RoomAttenuation[i], 0.0f);
}
}
break;
case ExponentDistanceClamped:
ClampedDist = clampf(ClampedDist, MinDist, MaxDist);
if(MaxDist < MinDist)
break;
/*fall-through*/
case ExponentDistance:
if(ClampedDist > 0.0f && MinDist > 0.0f)
{
Attenuation = powf(ClampedDist/MinDist, -Rolloff);
for(i = 0;i < NumSends;i++)
RoomAttenuation[i] = powf(ClampedDist/MinDist, -RoomRolloff[i]);
}
break;
case DisableDistance:
ClampedDist = MinDist;
break;
}
/* Source Gain + Attenuation */
DryGain = SourceVolume * Attenuation;
for(i = 0;i < NumSends;i++)
WetGain[i] = SourceVolume * RoomAttenuation[i];
/* Distance-based air absorption */
if(AirAbsorptionFactor > 0.0f && ClampedDist > MinDist)
{
ALfloat meters = (ClampedDist-MinDist) * MetersPerUnit;
DryGainHF *= powf(AIRABSORBGAINHF, AirAbsorptionFactor*meters);
for(i = 0;i < NumSends;i++)
WetGainHF[i] *= powf(RoomAirAbsorption[i], AirAbsorptionFactor*meters);
}
if(WetGainAuto)
{
ALfloat ApparentDist = 1.0f/maxf(Attenuation, 0.00001f) - 1.0f;
/* Apply a decay-time transformation to the wet path, based on the
* attenuation of the dry path.
*
* Using the apparent distance, based on the distance attenuation, the
* initial decay of the reverb effect is calculated and applied to the
* wet path.
*/
for(i = 0;i < NumSends;i++)
{
if(DecayDistance[i] > 0.0f)
WetGain[i] *= powf(0.001f/*-60dB*/, ApparentDist/DecayDistance[i]);
}
}
/* Calculate directional soundcones */
Angle = RAD2DEG(acosf(aluDotproduct(&Direction, &SourceToListener)) * ConeScale) * 2.0f;
if(Angle > InnerAngle && Angle <= OuterAngle)
{
ALfloat scale = (Angle-InnerAngle) / (OuterAngle-InnerAngle);
ConeVolume = lerp(1.0f, ALSource->OuterGain, scale);
ConeHF = lerp(1.0f, ALSource->OuterGainHF, scale);
}
else if(Angle > OuterAngle)
{
ConeVolume = ALSource->OuterGain;
ConeHF = ALSource->OuterGainHF;
}
else
{
ConeVolume = 1.0f;
ConeHF = 1.0f;
}
DryGain *= ConeVolume;
if(WetGainAuto)
{
for(i = 0;i < NumSends;i++)
WetGain[i] *= ConeVolume;
}
if(DryGainHFAuto)
DryGainHF *= ConeHF;
if(WetGainHFAuto)
{
for(i = 0;i < NumSends;i++)
WetGainHF[i] *= ConeHF;
}
/* Clamp to Min/Max Gain */
DryGain = clampf(DryGain, MinVolume, MaxVolume);
for(i = 0;i < NumSends;i++)
WetGain[i] = clampf(WetGain[i], MinVolume, MaxVolume);
/* Apply gain and frequency filters */
DryGain *= ALSource->Direct.Gain * ListenerGain;
DryGainHF *= ALSource->Direct.GainHF;
DryGainLF *= ALSource->Direct.GainLF;
for(i = 0;i < NumSends;i++)
{
WetGain[i] *= ALSource->Send[i].Gain * ListenerGain;
WetGainHF[i] *= ALSource->Send[i].GainHF;
WetGainLF[i] *= ALSource->Send[i].GainLF;
}
/* Calculate velocity-based doppler effect */
if(DopplerFactor > 0.0f)
{
const aluVector *lvelocity = &ALContext->Listener->Params.Velocity;
ALfloat VSS, VLS;
if(SpeedOfSound < 1.0f)
{
DopplerFactor *= 1.0f/SpeedOfSound;
SpeedOfSound = 1.0f;
}
VSS = aluDotproduct(&Velocity, &SourceToListener) * DopplerFactor;
VLS = aluDotproduct(lvelocity, &SourceToListener) * DopplerFactor;
Pitch *= clampf(SpeedOfSound-VLS, 1.0f, SpeedOfSound*2.0f - 1.0f) /
clampf(SpeedOfSound-VSS, 1.0f, SpeedOfSound*2.0f - 1.0f);
}
BufferListItem = ATOMIC_LOAD(&ALSource->queue);
while(BufferListItem != NULL)
{
ALbuffer *ALBuffer;
if((ALBuffer=BufferListItem->buffer) != NULL)
{
/* Calculate fixed-point stepping value, based on the pitch, buffer
* frequency, and output frequency. */
Pitch = Pitch * ALBuffer->Frequency / Frequency;
if(Pitch > (ALfloat)MAX_PITCH)
voice->Step = MAX_PITCH<<FRACTIONBITS;
else
{
voice->Step = fastf2i(Pitch*FRACTIONONE);
if(voice->Step == 0)
voice->Step = 1;
}
break;
}
BufferListItem = BufferListItem->next;
}
if(Device->Hrtf_Mode == FullHrtf)
{
/* Use a binaural HRTF algorithm for stereo headphone playback */
aluVector dir = {{ 0.0f, 0.0f, -1.0f, 0.0f }};
ALfloat ev = 0.0f, az = 0.0f;
ALfloat radius = ALSource->Radius;
ALfloat dirfact = 1.0f;
voice->Direct.OutBuffer += voice->Direct.OutChannels;
voice->Direct.OutChannels = 2;
if(Distance > FLT_EPSILON)
{
dir.v[0] = -SourceToListener.v[0];
dir.v[1] = -SourceToListener.v[1];
dir.v[2] = -SourceToListener.v[2] * ZScale;
/* Calculate elevation and azimuth only when the source is not at
* the listener. This prevents +0 and -0 Z from producing
* inconsistent panning. Also, clamp Y in case FP precision errors
* cause it to land outside of -1..+1. */
ev = asinf(clampf(dir.v[1], -1.0f, 1.0f));
az = atan2f(dir.v[0], -dir.v[2]);
}
if(radius > 0.0f)
{
if(radius >= Distance)
dirfact *= Distance / radius * 0.5f;
else
dirfact *= 1.0f - (asinf(radius / Distance) / F_PI);
}
/* Check to see if the HRIR is already moving. */
if(voice->Direct.Moving)
{
ALfloat delta;
delta = CalcFadeTime(voice->Direct.LastGain, DryGain,
&voice->Direct.LastDir, &dir);
/* If the delta is large enough, get the moving HRIR target
* coefficients, target delays, steppping values, and counter. */
if(delta > 0.000015f)
{
ALuint counter = GetMovingHrtfCoeffs(Device->Hrtf,
ev, az, dirfact, DryGain, delta, voice->Direct.Counter,
voice->Direct.Hrtf[0].Params.Coeffs, voice->Direct.Hrtf[0].Params.Delay,
voice->Direct.Hrtf[0].Params.CoeffStep, voice->Direct.Hrtf[0].Params.DelayStep
);
voice->Direct.Counter = counter;
voice->Direct.LastGain = DryGain;
voice->Direct.LastDir = dir;
}
}
else
{
/* Get the initial (static) HRIR coefficients and delays. */
GetLerpedHrtfCoeffs(Device->Hrtf, ev, az, dirfact, DryGain,
voice->Direct.Hrtf[0].Params.Coeffs,
voice->Direct.Hrtf[0].Params.Delay);
voice->Direct.Counter = 0;
voice->Direct.Moving = AL_TRUE;
voice->Direct.LastGain = DryGain;
voice->Direct.LastDir = dir;
}
voice->IsHrtf = AL_TRUE;
}
else
{
MixGains *gains = voice->Direct.Gains[0];
ALfloat dir[3] = { 0.0f, 0.0f, -1.0f };
ALfloat radius = ALSource->Radius;
ALfloat Target[MAX_OUTPUT_CHANNELS];
/* Get the localized direction, and compute panned gains. */
if(Distance > FLT_EPSILON)
{
dir[0] = -SourceToListener.v[0];
dir[1] = -SourceToListener.v[1];
dir[2] = -SourceToListener.v[2] * ZScale;
}
if(radius > 0.0f)
{
ALfloat dirfact;
if(radius >= Distance)
dirfact = Distance / radius * 0.5f;
else
dirfact = 1.0f - (asinf(radius / Distance) / F_PI);
dir[0] *= dirfact;
dir[1] *= dirfact;
dir[2] *= dirfact;
}
ComputeDirectionalGains(Device, dir, DryGain, Target);
for(j = 0;j < MAX_OUTPUT_CHANNELS;j++)
gains[j].Target = Target[j];
UpdateDryStepping(&voice->Direct, 1, (voice->Direct.Moving ? 64 : 0));
voice->Direct.Moving = AL_TRUE;
voice->IsHrtf = AL_FALSE;
}
for(i = 0;i < NumSends;i++)
{
voice->Send[i].Gain.Target = WetGain[i];
UpdateWetStepping(&voice->Send[i], (voice->Send[i].Moving ? 64 : 0));
voice->Send[i].Moving = AL_TRUE;
}
{
ALfloat gainhf = maxf(0.01f, DryGainHF);
ALfloat gainlf = maxf(0.01f, DryGainLF);
ALfloat hfscale = ALSource->Direct.HFReference / Frequency;
ALfloat lfscale = ALSource->Direct.LFReference / Frequency;
voice->Direct.Filters[0].ActiveType = AF_None;
if(gainhf != 1.0f) voice->Direct.Filters[0].ActiveType |= AF_LowPass;
if(gainlf != 1.0f) voice->Direct.Filters[0].ActiveType |= AF_HighPass;
ALfilterState_setParams(
&voice->Direct.Filters[0].LowPass, ALfilterType_HighShelf, gainhf,
hfscale, 0.0f
);
ALfilterState_setParams(
&voice->Direct.Filters[0].HighPass, ALfilterType_LowShelf, gainlf,
lfscale, 0.0f
);
}
for(i = 0;i < NumSends;i++)
{
ALfloat gainhf = maxf(0.01f, WetGainHF[i]);
ALfloat gainlf = maxf(0.01f, WetGainLF[i]);
ALfloat hfscale = ALSource->Send[i].HFReference / Frequency;
ALfloat lfscale = ALSource->Send[i].LFReference / Frequency;
voice->Send[i].Filters[0].ActiveType = AF_None;
if(gainhf != 1.0f) voice->Send[i].Filters[0].ActiveType |= AF_LowPass;
if(gainlf != 1.0f) voice->Send[i].Filters[0].ActiveType |= AF_HighPass;
ALfilterState_setParams(
&voice->Send[i].Filters[0].LowPass, ALfilterType_HighShelf, gainhf,
hfscale, 0.0f
);
ALfilterState_setParams(
&voice->Send[i].Filters[0].HighPass, ALfilterType_LowShelf, gainlf,
lfscale, 0.0f
);
}
}
ALvoid CalcNonAttnSourceParams(ALvoice *voice, const ALsource *ALSource, const ALCcontext *ALContext)
{
static const struct ChanMap MonoMap[1] = {
{ FrontCenter, 0.0f, 0.0f }
}, StereoMap[2] = {
{ FrontLeft, DEG2RAD(-30.0f), DEG2RAD(0.0f) },
{ FrontRight, DEG2RAD( 30.0f), DEG2RAD(0.0f) }
}, StereoWideMap[2] = {
{ FrontLeft, DEG2RAD(-90.0f), DEG2RAD(0.0f) },
{ FrontRight, DEG2RAD( 90.0f), DEG2RAD(0.0f) }
}, RearMap[2] = {
{ BackLeft, DEG2RAD(-150.0f), DEG2RAD(0.0f) },
{ BackRight, DEG2RAD( 150.0f), DEG2RAD(0.0f) }
}, QuadMap[4] = {
{ FrontLeft, DEG2RAD( -45.0f), DEG2RAD(0.0f) },
{ FrontRight, DEG2RAD( 45.0f), DEG2RAD(0.0f) },
{ BackLeft, DEG2RAD(-135.0f), DEG2RAD(0.0f) },
{ BackRight, DEG2RAD( 135.0f), DEG2RAD(0.0f) }
}, X51Map[6] = {
{ FrontLeft, DEG2RAD( -30.0f), DEG2RAD(0.0f) },
{ FrontRight, DEG2RAD( 30.0f), DEG2RAD(0.0f) },
{ FrontCenter, DEG2RAD( 0.0f), DEG2RAD(0.0f) },
{ LFE, 0.0f, 0.0f },
{ SideLeft, DEG2RAD(-110.0f), DEG2RAD(0.0f) },
{ SideRight, DEG2RAD( 110.0f), DEG2RAD(0.0f) }
}, X61Map[7] = {
{ FrontLeft, DEG2RAD(-30.0f), DEG2RAD(0.0f) },
{ FrontRight, DEG2RAD( 30.0f), DEG2RAD(0.0f) },
{ FrontCenter, DEG2RAD( 0.0f), DEG2RAD(0.0f) },
{ LFE, 0.0f, 0.0f },
{ BackCenter, DEG2RAD(180.0f), DEG2RAD(0.0f) },
{ SideLeft, DEG2RAD(-90.0f), DEG2RAD(0.0f) },
{ SideRight, DEG2RAD( 90.0f), DEG2RAD(0.0f) }
}, X71Map[8] = {
{ FrontLeft, DEG2RAD( -30.0f), DEG2RAD(0.0f) },
{ FrontRight, DEG2RAD( 30.0f), DEG2RAD(0.0f) },
{ FrontCenter, DEG2RAD( 0.0f), DEG2RAD(0.0f) },
{ LFE, 0.0f, 0.0f },
{ BackLeft, DEG2RAD(-150.0f), DEG2RAD(0.0f) },
{ BackRight, DEG2RAD( 150.0f), DEG2RAD(0.0f) },
{ SideLeft, DEG2RAD( -90.0f), DEG2RAD(0.0f) },
{ SideRight, DEG2RAD( 90.0f), DEG2RAD(0.0f) }
};
ALCdevice *Device = ALContext->Device;
ALfloat SourceVolume,ListenerGain,MinVolume,MaxVolume;
ALbufferlistitem *BufferListItem;
enum FmtChannels Channels;
ALfloat DryGain, DryGainHF, DryGainLF;
ALfloat WetGain[MAX_SENDS];
ALfloat WetGainHF[MAX_SENDS];
ALfloat WetGainLF[MAX_SENDS];
ALuint NumSends, Frequency;
ALboolean Relative;
const struct ChanMap *chans = NULL;
ALuint num_channels = 0;
ALboolean DirectChannels;
ALboolean isbformat = AL_FALSE;
ALfloat Pitch;
ALuint i, j, c;
/* Get device properties */
NumSends = Device->NumAuxSends;
Frequency = Device->Frequency;
/* Get listener properties */
ListenerGain = ALContext->Listener->Gain;
/* Get source properties */
SourceVolume = ALSource->Gain;
MinVolume = ALSource->MinGain;
MaxVolume = ALSource->MaxGain;
Pitch = ALSource->Pitch;
Relative = ALSource->HeadRelative;
DirectChannels = ALSource->DirectChannels;
voice->Direct.OutBuffer = Device->DryBuffer;
voice->Direct.OutChannels = Device->NumChannels;
for(i = 0;i < NumSends;i++)
{
ALeffectslot *Slot = ALSource->Send[i].Slot;
if(!Slot && i == 0)
Slot = Device->DefaultSlot;
if(!Slot || Slot->EffectType == AL_EFFECT_NULL)
voice->Send[i].OutBuffer = NULL;
else
voice->Send[i].OutBuffer = Slot->WetBuffer;
}
/* Calculate the stepping value */
Channels = FmtMono;
BufferListItem = ATOMIC_LOAD(&ALSource->queue);
while(BufferListItem != NULL)
{
ALbuffer *ALBuffer;
if((ALBuffer=BufferListItem->buffer) != NULL)
{
Pitch = Pitch * ALBuffer->Frequency / Frequency;
if(Pitch > (ALfloat)MAX_PITCH)
voice->Step = MAX_PITCH<<FRACTIONBITS;
else
{
voice->Step = fastf2i(Pitch*FRACTIONONE);
if(voice->Step == 0)
voice->Step = 1;
}
Channels = ALBuffer->FmtChannels;
break;
}
BufferListItem = BufferListItem->next;
}
/* Calculate gains */
DryGain = clampf(SourceVolume, MinVolume, MaxVolume);
DryGain *= ALSource->Direct.Gain * ListenerGain;
DryGainHF = ALSource->Direct.GainHF;
DryGainLF = ALSource->Direct.GainLF;
for(i = 0;i < NumSends;i++)
{
WetGain[i] = clampf(SourceVolume, MinVolume, MaxVolume);
WetGain[i] *= ALSource->Send[i].Gain * ListenerGain;
WetGainHF[i] = ALSource->Send[i].GainHF;
WetGainLF[i] = ALSource->Send[i].GainLF;
}
switch(Channels)
{
case FmtMono:
chans = MonoMap;
num_channels = 1;
break;
case FmtStereo:
/* HACK: Place the stereo channels at +/-90 degrees when using non-
* HRTF stereo output. This helps reduce the "monoization" caused
* by them panning towards the center. */
if(Device->FmtChans == DevFmtStereo && !Device->Hrtf)
chans = StereoWideMap;
else
chans = StereoMap;
num_channels = 2;
break;
case FmtRear:
chans = RearMap;
num_channels = 2;
break;
case FmtQuad:
chans = QuadMap;
num_channels = 4;
break;
case FmtX51:
chans = X51Map;
num_channels = 6;
break;
case FmtX61:
chans = X61Map;
num_channels = 7;
break;
case FmtX71:
chans = X71Map;
num_channels = 8;
break;
case FmtBFormat2D:
num_channels = 3;
isbformat = AL_TRUE;
DirectChannels = AL_FALSE;
break;
case FmtBFormat3D:
num_channels = 4;
isbformat = AL_TRUE;
DirectChannels = AL_FALSE;
break;
}
if(isbformat)
{
ALfloat N[3], V[3], U[3];
aluMatrix matrix;
/* AT then UP */
N[0] = ALSource->Orientation[0][0];
N[1] = ALSource->Orientation[0][1];
N[2] = ALSource->Orientation[0][2];
aluNormalize(N);
V[0] = ALSource->Orientation[1][0];
V[1] = ALSource->Orientation[1][1];
V[2] = ALSource->Orientation[1][2];
aluNormalize(V);
if(!Relative)
{
const aluMatrix *lmatrix = &ALContext->Listener->Params.Matrix;
aluVector at, up;
aluVectorSet(&at, N[0], N[1], N[2], 0.0f);
aluVectorSet(&up, V[0], V[1], V[2], 0.0f);
aluMatrixVector(&at, lmatrix);
aluMatrixVector(&up, lmatrix);
N[0] = at.v[0]; N[1] = at.v[1]; N[2] = at.v[2];
V[0] = up.v[0]; V[1] = up.v[1]; V[2] = up.v[2];
}
/* Build and normalize right-vector */
aluCrossproduct(N, V, U);
aluNormalize(U);
aluMatrixSet(&matrix,
1.0f, 0.0f, 0.0f, 0.0f,
0.0f, -N[2], -N[0], N[1],
0.0f, U[2], U[0], -U[1],
0.0f, -V[2], -V[0], V[1]
);
for(c = 0;c < num_channels;c++)
{
MixGains *gains = voice->Direct.Gains[c];
ALfloat Target[MAX_OUTPUT_CHANNELS];
ComputeBFormatGains(Device, matrix.m[c], DryGain, Target);
for(i = 0;i < MAX_OUTPUT_CHANNELS;i++)
gains[i].Target = Target[i];
}
UpdateDryStepping(&voice->Direct, num_channels, (voice->Direct.Moving ? 64 : 0));
voice->Direct.Moving = AL_TRUE;
voice->IsHrtf = AL_FALSE;
for(i = 0;i < NumSends;i++)
WetGain[i] *= 1.4142f;
}
else if(DirectChannels != AL_FALSE)
{
if(Device->Hrtf)
{
voice->Direct.OutBuffer += voice->Direct.OutChannels;
voice->Direct.OutChannels = 2;
for(c = 0;c < num_channels;c++)
{
MixGains *gains = voice->Direct.Gains[c];
for(j = 0;j < MAX_OUTPUT_CHANNELS;j++)
gains[j].Target = 0.0f;
if(chans[c].channel == FrontLeft)
gains[0].Target = DryGain;
else if(chans[c].channel == FrontRight)
gains[1].Target = DryGain;
}
}
else for(c = 0;c < num_channels;c++)
{
MixGains *gains = voice->Direct.Gains[c];
int idx;
for(j = 0;j < MAX_OUTPUT_CHANNELS;j++)
gains[j].Target = 0.0f;
if((idx=GetChannelIdxByName(Device, chans[c].channel)) != -1)
gains[idx].Target = DryGain;
}
UpdateDryStepping(&voice->Direct, num_channels, (voice->Direct.Moving ? 64 : 0));
voice->Direct.Moving = AL_TRUE;
voice->IsHrtf = AL_FALSE;
}
else if(Device->Hrtf_Mode == FullHrtf)
{
voice->Direct.OutBuffer += voice->Direct.OutChannels;
voice->Direct.OutChannels = 2;
for(c = 0;c < num_channels;c++)
{
if(chans[c].channel == LFE)
{
/* Skip LFE */
voice->Direct.Hrtf[c].Params.Delay[0] = 0;
voice->Direct.Hrtf[c].Params.Delay[1] = 0;
for(i = 0;i < HRIR_LENGTH;i++)
{
voice->Direct.Hrtf[c].Params.Coeffs[i][0] = 0.0f;
voice->Direct.Hrtf[c].Params.Coeffs[i][1] = 0.0f;
}
}
else
{
/* Get the static HRIR coefficients and delays for this
* channel. */
GetLerpedHrtfCoeffs(Device->Hrtf,
chans[c].elevation, chans[c].angle, 1.0f, DryGain,
voice->Direct.Hrtf[c].Params.Coeffs,
voice->Direct.Hrtf[c].Params.Delay);
}
}
voice->Direct.Counter = 0;
voice->Direct.Moving = AL_TRUE;
voice->IsHrtf = AL_TRUE;
}
else
{
for(c = 0;c < num_channels;c++)
{
MixGains *gains = voice->Direct.Gains[c];
ALfloat Target[MAX_OUTPUT_CHANNELS];
/* Special-case LFE */
if(chans[c].channel == LFE)
{
int idx;
for(i = 0;i < MAX_OUTPUT_CHANNELS;i++)
gains[i].Target = 0.0f;
if((idx=GetChannelIdxByName(Device, chans[c].channel)) != -1)
gains[idx].Target = DryGain;
continue;
}
ComputeAngleGains(Device, chans[c].angle, chans[c].elevation, DryGain, Target);
for(i = 0;i < MAX_OUTPUT_CHANNELS;i++)
gains[i].Target = Target[i];
}
UpdateDryStepping(&voice->Direct, num_channels, (voice->Direct.Moving ? 64 : 0));
voice->Direct.Moving = AL_TRUE;
voice->IsHrtf = AL_FALSE;
}
for(i = 0;i < NumSends;i++)
{
voice->Send[i].Gain.Target = WetGain[i];
UpdateWetStepping(&voice->Send[i], (voice->Send[i].Moving ? 64 : 0));
voice->Send[i].Moving = AL_TRUE;
}
{
ALfloat gainhf = maxf(0.01f, DryGainHF);
ALfloat gainlf = maxf(0.01f, DryGainLF);
ALfloat hfscale = ALSource->Direct.HFReference / Frequency;
ALfloat lfscale = ALSource->Direct.LFReference / Frequency;
for(c = 0;c < num_channels;c++)
{
voice->Direct.Filters[c].ActiveType = AF_None;
if(gainhf != 1.0f) voice->Direct.Filters[c].ActiveType |= AF_LowPass;
if(gainlf != 1.0f) voice->Direct.Filters[c].ActiveType |= AF_HighPass;
ALfilterState_setParams(
&voice->Direct.Filters[c].LowPass, ALfilterType_HighShelf, gainhf,
hfscale, 0.0f
);
ALfilterState_setParams(
&voice->Direct.Filters[c].HighPass, ALfilterType_LowShelf, gainlf,
lfscale, 0.0f
);
}
}
for(i = 0;i < NumSends;i++)
{
ALfloat gainhf = maxf(0.01f, WetGainHF[i]);
ALfloat gainlf = maxf(0.01f, WetGainLF[i]);
ALfloat hfscale = ALSource->Send[i].HFReference / Frequency;
ALfloat lfscale = ALSource->Send[i].LFReference / Frequency;
for(c = 0;c < num_channels;c++)
{
voice->Send[i].Filters[c].ActiveType = AF_None;
if(gainhf != 1.0f) voice->Send[i].Filters[c].ActiveType |= AF_LowPass;
if(gainlf != 1.0f) voice->Send[i].Filters[c].ActiveType |= AF_HighPass;
ALfilterState_setParams(
&voice->Send[i].Filters[c].LowPass, ALfilterType_HighShelf, gainhf,
hfscale, 0.0f
);
ALfilterState_setParams(
&voice->Send[i].Filters[c].HighPass, ALfilterType_LowShelf, gainlf,
lfscale, 0.0f
);
}
}
}