2 * OpenAL cross platform audio library
3 * Copyright (C) 1999-2007 by authors.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
18 * Or go to http://www.gnu.org/copyleft/lgpl.html
34 #include "alListener.h"
35 #include "alAuxEffectSlot.h"
40 static __inline ALvoid
aluCrossproduct(const ALfloat
*inVector1
, const ALfloat
*inVector2
, ALfloat
*outVector
)
42 outVector
[0] = inVector1
[1]*inVector2
[2] - inVector1
[2]*inVector2
[1];
43 outVector
[1] = inVector1
[2]*inVector2
[0] - inVector1
[0]*inVector2
[2];
44 outVector
[2] = inVector1
[0]*inVector2
[1] - inVector1
[1]*inVector2
[0];
47 static __inline ALfloat
aluDotproduct(const ALfloat
*inVector1
, const ALfloat
*inVector2
)
49 return inVector1
[0]*inVector2
[0] + inVector1
[1]*inVector2
[1] +
50 inVector1
[2]*inVector2
[2];
53 static __inline ALvoid
aluNormalize(ALfloat
*inVector
)
55 ALfloat length
, inverse_length
;
57 length
= aluSqrt(aluDotproduct(inVector
, inVector
));
60 inverse_length
= 1.0f
/length
;
61 inVector
[0] *= inverse_length
;
62 inVector
[1] *= inverse_length
;
63 inVector
[2] *= inverse_length
;
67 static __inline ALvoid
aluMatrixVector(ALfloat
*vector
,ALfloat w
,ALfloat matrix
[4][4])
70 vector
[0], vector
[1], vector
[2], w
73 vector
[0] = temp
[0]*matrix
[0][0] + temp
[1]*matrix
[1][0] + temp
[2]*matrix
[2][0] + temp
[3]*matrix
[3][0];
74 vector
[1] = temp
[0]*matrix
[0][1] + temp
[1]*matrix
[1][1] + temp
[2]*matrix
[2][1] + temp
[3]*matrix
[3][1];
75 vector
[2] = temp
[0]*matrix
[0][2] + temp
[1]*matrix
[1][2] + temp
[2]*matrix
[2][2] + temp
[3]*matrix
[3][2];
79 ALvoid
CalcNonAttnSourceParams(ALsource
*ALSource
, const ALCcontext
*ALContext
)
81 ALfloat SourceVolume
,ListenerGain
,MinVolume
,MaxVolume
;
82 ALbufferlistitem
*BufferListItem
;
83 ALfloat DryGain
, DryGainHF
;
84 ALfloat WetGain
[MAX_SENDS
];
85 ALfloat WetGainHF
[MAX_SENDS
];
86 ALint NumSends
, Frequency
;
94 //Get context properties
95 Format
= ALContext
->Device
->Format
;
96 DupStereo
= ALContext
->Device
->DuplicateStereo
;
97 NumSends
= ALContext
->Device
->NumAuxSends
;
98 Frequency
= ALContext
->Device
->Frequency
;
100 //Get listener properties
101 ListenerGain
= ALContext
->Listener
.Gain
;
103 //Get source properties
104 SourceVolume
= ALSource
->flGain
;
105 MinVolume
= ALSource
->flMinGain
;
106 MaxVolume
= ALSource
->flMaxGain
;
108 //1. Multi-channel buffers always play "normal"
110 Pitch
= ALSource
->flPitch
;
111 BufferListItem
= ALSource
->queue
;
112 while(BufferListItem
!= NULL
)
115 if((ALBuffer
=BufferListItem
->buffer
) != NULL
)
117 Channels
= aluChannelsFromFormat(ALBuffer
->format
);
118 Pitch
= Pitch
* ALBuffer
->frequency
/ Frequency
;
121 BufferListItem
= BufferListItem
->next
;
124 if(Pitch
> (float)MAX_PITCH
)
125 ALSource
->Params
.Step
= MAX_PITCH
<<FRACTIONBITS
;
126 else if(!(Pitch
> 0.0f
))
127 ALSource
->Params
.Step
= 1<<FRACTIONBITS
;
130 ALSource
->Params
.Step
= Pitch
*(1<<FRACTIONBITS
);
131 if(ALSource
->Params
.Step
== 0)
132 ALSource
->Params
.Step
= 1;
135 DryGain
= SourceVolume
;
136 DryGain
= __min(DryGain
,MaxVolume
);
137 DryGain
= __max(DryGain
,MinVolume
);
140 switch(ALSource
->DirectFilter
.type
)
142 case AL_FILTER_LOWPASS
:
143 DryGain
*= ALSource
->DirectFilter
.Gain
;
144 DryGainHF
*= ALSource
->DirectFilter
.GainHF
;
150 for(i
= 0;i
< OUTPUTCHANNELS
;i
++)
151 ALSource
->Params
.DryGains
[i
] = 0.0f
;
153 if(DupStereo
== AL_FALSE
)
155 ALSource
->Params
.DryGains
[FRONT_LEFT
] = DryGain
* ListenerGain
;
156 ALSource
->Params
.DryGains
[FRONT_RIGHT
] = DryGain
* ListenerGain
;
162 case AL_FORMAT_MONO8
:
163 case AL_FORMAT_MONO16
:
164 case AL_FORMAT_MONO_FLOAT32
:
165 case AL_FORMAT_STEREO8
:
166 case AL_FORMAT_STEREO16
:
167 case AL_FORMAT_STEREO_FLOAT32
:
168 ALSource
->Params
.DryGains
[FRONT_LEFT
] = DryGain
* ListenerGain
;
169 ALSource
->Params
.DryGains
[FRONT_RIGHT
] = DryGain
* ListenerGain
;
172 case AL_FORMAT_QUAD8
:
173 case AL_FORMAT_QUAD16
:
174 case AL_FORMAT_QUAD32
:
175 case AL_FORMAT_51CHN8
:
176 case AL_FORMAT_51CHN16
:
177 case AL_FORMAT_51CHN32
:
178 DryGain
*= aluSqrt(2.0f
/4.0f
);
179 ALSource
->Params
.DryGains
[FRONT_LEFT
] = DryGain
* ListenerGain
;
180 ALSource
->Params
.DryGains
[FRONT_RIGHT
] = DryGain
* ListenerGain
;
181 ALSource
->Params
.DryGains
[BACK_LEFT
] = DryGain
* ListenerGain
;
182 ALSource
->Params
.DryGains
[BACK_RIGHT
] = DryGain
* ListenerGain
;
185 case AL_FORMAT_61CHN8
:
186 case AL_FORMAT_61CHN16
:
187 case AL_FORMAT_61CHN32
:
188 DryGain
*= aluSqrt(2.0f
/4.0f
);
189 ALSource
->Params
.DryGains
[FRONT_LEFT
] = DryGain
* ListenerGain
;
190 ALSource
->Params
.DryGains
[FRONT_RIGHT
] = DryGain
* ListenerGain
;
191 ALSource
->Params
.DryGains
[SIDE_LEFT
] = DryGain
* ListenerGain
;
192 ALSource
->Params
.DryGains
[SIDE_RIGHT
] = DryGain
* ListenerGain
;
195 case AL_FORMAT_71CHN8
:
196 case AL_FORMAT_71CHN16
:
197 case AL_FORMAT_71CHN32
:
198 DryGain
*= aluSqrt(2.0f
/6.0f
);
199 ALSource
->Params
.DryGains
[FRONT_LEFT
] = DryGain
* ListenerGain
;
200 ALSource
->Params
.DryGains
[FRONT_RIGHT
] = DryGain
* ListenerGain
;
201 ALSource
->Params
.DryGains
[BACK_LEFT
] = DryGain
* ListenerGain
;
202 ALSource
->Params
.DryGains
[BACK_RIGHT
] = DryGain
* ListenerGain
;
203 ALSource
->Params
.DryGains
[SIDE_LEFT
] = DryGain
* ListenerGain
;
204 ALSource
->Params
.DryGains
[SIDE_RIGHT
] = DryGain
* ListenerGain
;
214 for(i
= 0;i
< OUTPUTCHANNELS
;i
++)
215 ALSource
->Params
.DryGains
[i
] = DryGain
* ListenerGain
;
218 for(i
= 0;i
< NumSends
;i
++)
220 WetGain
[i
] = SourceVolume
;
221 WetGain
[i
] = __min(WetGain
[i
],MaxVolume
);
222 WetGain
[i
] = __max(WetGain
[i
],MinVolume
);
225 switch(ALSource
->Send
[i
].WetFilter
.type
)
227 case AL_FILTER_LOWPASS
:
228 WetGain
[i
] *= ALSource
->Send
[i
].WetFilter
.Gain
;
229 WetGainHF
[i
] *= ALSource
->Send
[i
].WetFilter
.GainHF
;
233 ALSource
->Params
.WetGains
[i
] = WetGain
[i
] * ListenerGain
;
235 for(i
= NumSends
;i
< MAX_SENDS
;i
++)
237 ALSource
->Params
.WetGains
[i
] = 0.0f
;
241 /* Update filter coefficients. Calculations based on the I3DL2
243 cw
= cos(2.0*M_PI
* LOWPASSFREQCUTOFF
/ Frequency
);
245 /* We use two chained one-pole filters, so we need to take the
246 * square root of the squared gain, which is the same as the base
248 ALSource
->Params
.iirFilter
.coeff
= lpCoeffCalc(DryGainHF
, cw
);
250 for(i
= 0;i
< NumSends
;i
++)
252 /* We use a one-pole filter, so we need to take the squared gain */
253 ALfloat a
= lpCoeffCalc(WetGainHF
[i
]*WetGainHF
[i
], cw
);
254 ALSource
->Params
.Send
[i
].iirFilter
.coeff
= a
;
258 ALvoid
CalcSourceParams(ALsource
*ALSource
, const ALCcontext
*ALContext
)
260 const ALCdevice
*Device
= ALContext
->Device
;
261 ALfloat InnerAngle
,OuterAngle
,Angle
,Distance
,DryMix
,OrigDist
;
262 ALfloat Direction
[3],Position
[3],SourceToListener
[3];
263 ALfloat Velocity
[3],ListenerVel
[3];
264 ALfloat MinVolume
,MaxVolume
,MinDist
,MaxDist
,Rolloff
,OuterGainHF
;
265 ALfloat ConeVolume
,ConeHF
,SourceVolume
,ListenerGain
;
266 ALfloat DopplerFactor
, DopplerVelocity
, flSpeedOfSound
;
267 ALfloat AirAbsorptionFactor
;
268 ALbufferlistitem
*BufferListItem
;
269 ALfloat Matrix
[4][4];
270 ALfloat flAttenuation
, effectiveDist
;
271 ALfloat RoomAttenuation
[MAX_SENDS
];
272 ALfloat MetersPerUnit
;
273 ALfloat RoomRolloff
[MAX_SENDS
];
274 ALfloat DryGainHF
= 1.0f
;
275 ALfloat WetGain
[MAX_SENDS
];
276 ALfloat WetGainHF
[MAX_SENDS
];
277 ALfloat DirGain
, AmbientGain
;
278 const ALfloat
*SpeakerGain
;
286 for(i
= 0;i
< MAX_SENDS
;i
++)
289 //Get context properties
290 DopplerFactor
= ALContext
->DopplerFactor
* ALSource
->DopplerFactor
;
291 DopplerVelocity
= ALContext
->DopplerVelocity
;
292 flSpeedOfSound
= ALContext
->flSpeedOfSound
;
293 NumSends
= Device
->NumAuxSends
;
294 Frequency
= Device
->Frequency
;
296 //Get listener properties
297 ListenerGain
= ALContext
->Listener
.Gain
;
298 MetersPerUnit
= ALContext
->Listener
.MetersPerUnit
;
299 memcpy(ListenerVel
, ALContext
->Listener
.Velocity
, sizeof(ALContext
->Listener
.Velocity
));
301 //Get source properties
302 SourceVolume
= ALSource
->flGain
;
303 memcpy(Position
, ALSource
->vPosition
, sizeof(ALSource
->vPosition
));
304 memcpy(Direction
, ALSource
->vOrientation
, sizeof(ALSource
->vOrientation
));
305 memcpy(Velocity
, ALSource
->vVelocity
, sizeof(ALSource
->vVelocity
));
306 MinVolume
= ALSource
->flMinGain
;
307 MaxVolume
= ALSource
->flMaxGain
;
308 MinDist
= ALSource
->flRefDistance
;
309 MaxDist
= ALSource
->flMaxDistance
;
310 Rolloff
= ALSource
->flRollOffFactor
;
311 InnerAngle
= ALSource
->flInnerAngle
;
312 OuterAngle
= ALSource
->flOuterAngle
;
313 OuterGainHF
= ALSource
->OuterGainHF
;
314 AirAbsorptionFactor
= ALSource
->AirAbsorptionFactor
;
316 //1. Translate Listener to origin (convert to head relative)
317 if(ALSource
->bHeadRelative
==AL_FALSE
)
319 ALfloat U
[3],V
[3],N
[3];
321 // Build transform matrix
322 memcpy(N
, ALContext
->Listener
.Forward
, sizeof(N
)); // At-vector
323 aluNormalize(N
); // Normalized At-vector
324 memcpy(V
, ALContext
->Listener
.Up
, sizeof(V
)); // Up-vector
325 aluNormalize(V
); // Normalized Up-vector
326 aluCrossproduct(N
, V
, U
); // Right-vector
327 aluNormalize(U
); // Normalized Right-vector
328 Matrix
[0][0] = U
[0]; Matrix
[0][1] = V
[0]; Matrix
[0][2] = -N
[0]; Matrix
[0][3] = 0.0f
;
329 Matrix
[1][0] = U
[1]; Matrix
[1][1] = V
[1]; Matrix
[1][2] = -N
[1]; Matrix
[1][3] = 0.0f
;
330 Matrix
[2][0] = U
[2]; Matrix
[2][1] = V
[2]; Matrix
[2][2] = -N
[2]; Matrix
[2][3] = 0.0f
;
331 Matrix
[3][0] = 0.0f
; Matrix
[3][1] = 0.0f
; Matrix
[3][2] = 0.0f
; Matrix
[3][3] = 1.0f
;
333 // Translate position
334 Position
[0] -= ALContext
->Listener
.Position
[0];
335 Position
[1] -= ALContext
->Listener
.Position
[1];
336 Position
[2] -= ALContext
->Listener
.Position
[2];
338 // Transform source position and direction into listener space
339 aluMatrixVector(Position
, 1.0f
, Matrix
);
340 aluMatrixVector(Direction
, 0.0f
, Matrix
);
341 // Transform source and listener velocity into listener space
342 aluMatrixVector(Velocity
, 0.0f
, Matrix
);
343 aluMatrixVector(ListenerVel
, 0.0f
, Matrix
);
346 ListenerVel
[0] = ListenerVel
[1] = ListenerVel
[2] = 0.0f
;
348 SourceToListener
[0] = -Position
[0];
349 SourceToListener
[1] = -Position
[1];
350 SourceToListener
[2] = -Position
[2];
351 aluNormalize(SourceToListener
);
352 aluNormalize(Direction
);
354 //2. Calculate distance attenuation
355 Distance
= aluSqrt(aluDotproduct(Position
, Position
));
358 flAttenuation
= 1.0f
;
359 for(i
= 0;i
< NumSends
;i
++)
361 RoomAttenuation
[i
] = 1.0f
;
363 RoomRolloff
[i
] = ALSource
->RoomRolloffFactor
;
364 if(ALSource
->Send
[i
].Slot
&&
365 (ALSource
->Send
[i
].Slot
->effect
.type
== AL_EFFECT_REVERB
||
366 ALSource
->Send
[i
].Slot
->effect
.type
== AL_EFFECT_EAXREVERB
))
367 RoomRolloff
[i
] += ALSource
->Send
[i
].Slot
->effect
.Reverb
.RoomRolloffFactor
;
370 switch(ALContext
->SourceDistanceModel
? ALSource
->DistanceModel
:
371 ALContext
->DistanceModel
)
373 case AL_INVERSE_DISTANCE_CLAMPED
:
374 Distance
=__max(Distance
,MinDist
);
375 Distance
=__min(Distance
,MaxDist
);
376 if(MaxDist
< MinDist
)
379 case AL_INVERSE_DISTANCE
:
382 if((MinDist
+ (Rolloff
* (Distance
- MinDist
))) > 0.0f
)
383 flAttenuation
= MinDist
/ (MinDist
+ (Rolloff
* (Distance
- MinDist
)));
384 for(i
= 0;i
< NumSends
;i
++)
386 if((MinDist
+ (RoomRolloff
[i
] * (Distance
- MinDist
))) > 0.0f
)
387 RoomAttenuation
[i
] = MinDist
/ (MinDist
+ (RoomRolloff
[i
] * (Distance
- MinDist
)));
392 case AL_LINEAR_DISTANCE_CLAMPED
:
393 Distance
=__max(Distance
,MinDist
);
394 Distance
=__min(Distance
,MaxDist
);
395 if(MaxDist
< MinDist
)
398 case AL_LINEAR_DISTANCE
:
399 Distance
=__min(Distance
,MaxDist
);
400 if(MaxDist
!= MinDist
)
402 flAttenuation
= 1.0f
- (Rolloff
*(Distance
-MinDist
)/(MaxDist
- MinDist
));
403 for(i
= 0;i
< NumSends
;i
++)
404 RoomAttenuation
[i
] = 1.0f
- (RoomRolloff
[i
]*(Distance
-MinDist
)/(MaxDist
- MinDist
));
408 case AL_EXPONENT_DISTANCE_CLAMPED
:
409 Distance
=__max(Distance
,MinDist
);
410 Distance
=__min(Distance
,MaxDist
);
411 if(MaxDist
< MinDist
)
414 case AL_EXPONENT_DISTANCE
:
415 if(Distance
> 0.0f
&& MinDist
> 0.0f
)
417 flAttenuation
= aluPow(Distance
/MinDist
, -Rolloff
);
418 for(i
= 0;i
< NumSends
;i
++)
419 RoomAttenuation
[i
] = aluPow(Distance
/MinDist
, -RoomRolloff
[i
]);
427 // Source Gain + Attenuation
428 DryMix
= SourceVolume
* flAttenuation
;
429 for(i
= 0;i
< NumSends
;i
++)
430 WetGain
[i
] = SourceVolume
* RoomAttenuation
[i
];
432 effectiveDist
= 0.0f
;
433 if(MinDist
> 0.0f
&& flAttenuation
< 1.0f
)
434 effectiveDist
= (MinDist
/flAttenuation
- MinDist
)*MetersPerUnit
;
436 // Distance-based air absorption
437 if(AirAbsorptionFactor
> 0.0f
&& effectiveDist
> 0.0f
)
441 // Absorption calculation is done in dB
442 absorb
= (AirAbsorptionFactor
*AIRABSORBGAINDBHF
) *
444 // Convert dB to linear gain before applying
445 absorb
= aluPow(10.0f
, absorb
/20.0f
);
450 //3. Apply directional soundcones
451 Angle
= aluAcos(aluDotproduct(Direction
,SourceToListener
)) * 180.0f
/M_PI
;
452 if(Angle
>= InnerAngle
&& Angle
<= OuterAngle
)
454 ALfloat scale
= (Angle
-InnerAngle
) / (OuterAngle
-InnerAngle
);
455 ConeVolume
= (1.0f
+(ALSource
->flOuterGain
-1.0f
)*scale
);
456 ConeHF
= (1.0f
+(OuterGainHF
-1.0f
)*scale
);
458 else if(Angle
> OuterAngle
)
460 ConeVolume
= (1.0f
+(ALSource
->flOuterGain
-1.0f
));
461 ConeHF
= (1.0f
+(OuterGainHF
-1.0f
));
469 // Apply some high-frequency attenuation for sources behind the listener
470 // NOTE: This should be aluDotproduct({0,0,-1}, ListenerToSource), however
471 // that is equivalent to aluDotproduct({0,0,1}, SourceToListener), which is
472 // the same as SourceToListener[2]
473 Angle
= aluAcos(SourceToListener
[2]) * 180.0f
/M_PI
;
474 // Sources within the minimum distance attenuate less
475 if(OrigDist
< MinDist
)
476 Angle
*= OrigDist
/MinDist
;
479 ALfloat scale
= (Angle
-90.0f
) / (180.1f
-90.0f
); // .1 to account for fp errors
480 ConeHF
*= 1.0f
- (Device
->HeadDampen
*scale
);
483 DryMix
*= ConeVolume
;
484 if(ALSource
->DryGainHFAuto
)
487 // Clamp to Min/Max Gain
488 DryMix
= __min(DryMix
,MaxVolume
);
489 DryMix
= __max(DryMix
,MinVolume
);
491 for(i
= 0;i
< NumSends
;i
++)
493 ALeffectslot
*Slot
= ALSource
->Send
[i
].Slot
;
495 if(!Slot
|| Slot
->effect
.type
== AL_EFFECT_NULL
)
497 ALSource
->Params
.WetGains
[i
] = 0.0f
;
502 if(Slot
->AuxSendAuto
)
504 if(ALSource
->WetGainAuto
)
505 WetGain
[i
] *= ConeVolume
;
506 if(ALSource
->WetGainHFAuto
)
507 WetGainHF
[i
] *= ConeHF
;
509 // Clamp to Min/Max Gain
510 WetGain
[i
] = __min(WetGain
[i
],MaxVolume
);
511 WetGain
[i
] = __max(WetGain
[i
],MinVolume
);
513 if(Slot
->effect
.type
== AL_EFFECT_REVERB
||
514 Slot
->effect
.type
== AL_EFFECT_EAXREVERB
)
516 /* Apply a decay-time transformation to the wet path, based on
517 * the attenuation of the dry path.
519 * Using the approximate (effective) source to listener
520 * distance, the initial decay of the reverb effect is
521 * calculated and applied to the wet path.
523 WetGain
[i
] *= aluPow(10.0f
, effectiveDist
/
524 (SPEEDOFSOUNDMETRESPERSEC
*
525 Slot
->effect
.Reverb
.DecayTime
) *
528 WetGainHF
[i
] *= aluPow(10.0f
,
529 log10(Slot
->effect
.Reverb
.AirAbsorptionGainHF
) *
530 AirAbsorptionFactor
* effectiveDist
);
535 /* If the slot's auxiliary send auto is off, the data sent to the
536 * effect slot is the same as the dry path, sans filter effects */
538 WetGainHF
[i
] = DryGainHF
;
541 switch(ALSource
->Send
[i
].WetFilter
.type
)
543 case AL_FILTER_LOWPASS
:
544 WetGain
[i
] *= ALSource
->Send
[i
].WetFilter
.Gain
;
545 WetGainHF
[i
] *= ALSource
->Send
[i
].WetFilter
.GainHF
;
548 ALSource
->Params
.WetGains
[i
] = WetGain
[i
] * ListenerGain
;
550 for(i
= NumSends
;i
< MAX_SENDS
;i
++)
552 ALSource
->Params
.WetGains
[i
] = 0.0f
;
556 // Apply filter gains and filters
557 switch(ALSource
->DirectFilter
.type
)
559 case AL_FILTER_LOWPASS
:
560 DryMix
*= ALSource
->DirectFilter
.Gain
;
561 DryGainHF
*= ALSource
->DirectFilter
.GainHF
;
564 DryMix
*= ListenerGain
;
566 // Calculate Velocity
567 if(DopplerFactor
!= 0.0f
)
569 ALfloat flVSS
, flVLS
;
570 ALfloat flMaxVelocity
= (DopplerVelocity
* flSpeedOfSound
) /
573 flVSS
= aluDotproduct(Velocity
, SourceToListener
);
574 if(flVSS
>= flMaxVelocity
)
575 flVSS
= (flMaxVelocity
- 1.0f
);
576 else if(flVSS
<= -flMaxVelocity
)
577 flVSS
= -flMaxVelocity
+ 1.0f
;
579 flVLS
= aluDotproduct(ListenerVel
, SourceToListener
);
580 if(flVLS
>= flMaxVelocity
)
581 flVLS
= (flMaxVelocity
- 1.0f
);
582 else if(flVLS
<= -flMaxVelocity
)
583 flVLS
= -flMaxVelocity
+ 1.0f
;
585 Pitch
= ALSource
->flPitch
*
586 ((flSpeedOfSound
* DopplerVelocity
) - (DopplerFactor
* flVLS
)) /
587 ((flSpeedOfSound
* DopplerVelocity
) - (DopplerFactor
* flVSS
));
590 Pitch
= ALSource
->flPitch
;
592 BufferListItem
= ALSource
->queue
;
593 while(BufferListItem
!= NULL
)
596 if((ALBuffer
=BufferListItem
->buffer
) != NULL
)
598 Pitch
= Pitch
* ALBuffer
->frequency
/ Frequency
;
601 BufferListItem
= BufferListItem
->next
;
604 if(Pitch
> (float)MAX_PITCH
)
605 ALSource
->Params
.Step
= MAX_PITCH
<<FRACTIONBITS
;
606 else if(!(Pitch
> 0.0f
))
607 ALSource
->Params
.Step
= 1<<FRACTIONBITS
;
610 ALSource
->Params
.Step
= Pitch
*(1<<FRACTIONBITS
);
611 if(ALSource
->Params
.Step
== 0)
612 ALSource
->Params
.Step
= 1;
615 // Use energy-preserving panning algorithm for multi-speaker playback
616 length
= __max(OrigDist
, MinDist
);
619 ALfloat invlen
= 1.0f
/length
;
620 Position
[0] *= invlen
;
621 Position
[1] *= invlen
;
622 Position
[2] *= invlen
;
625 pos
= aluCart2LUTpos(-Position
[2], Position
[0]);
626 SpeakerGain
= &Device
->PanningLUT
[OUTPUTCHANNELS
* pos
];
628 DirGain
= aluSqrt(Position
[0]*Position
[0] + Position
[2]*Position
[2]);
629 // elevation adjustment for directional gain. this sucks, but
630 // has low complexity
631 AmbientGain
= 1.0/aluSqrt(Device
->NumChan
) * (1.0-DirGain
);
632 for(s
= 0;s
< OUTPUTCHANNELS
;s
++)
633 ALSource
->Params
.DryGains
[s
] = 0.0f
;
634 for(s
= 0;s
< (ALsizei
)Device
->NumChan
;s
++)
636 Channel chan
= Device
->Speaker2Chan
[s
];
637 ALfloat gain
= SpeakerGain
[chan
]*DirGain
+ AmbientGain
;
638 ALSource
->Params
.DryGains
[chan
] = DryMix
* gain
;
641 /* Update filter coefficients. */
642 cw
= cos(2.0*M_PI
* LOWPASSFREQCUTOFF
/ Frequency
);
644 /* Spatialized sources use four chained one-pole filters, so we need to
645 * take the fourth root of the squared gain, which is the same as the
646 * square root of the base gain. */
647 ALSource
->Params
.iirFilter
.coeff
= lpCoeffCalc(aluSqrt(DryGainHF
), cw
);
649 for(i
= 0;i
< NumSends
;i
++)
651 /* The wet path uses two chained one-pole filters, so take the
652 * base gain (square root of the squared gain) */
653 ALSource
->Params
.Send
[i
].iirFilter
.coeff
= lpCoeffCalc(WetGainHF
[i
], cw
);
658 ALvoid
aluHandleDisconnect(ALCdevice
*device
)
662 SuspendContext(NULL
);
663 for(i
= 0;i
< device
->NumContexts
;i
++)
665 ALCcontext
*Context
= device
->Contexts
[i
];
669 SuspendContext(Context
);
671 for(pos
= 0;pos
< Context
->SourceMap
.size
;pos
++)
673 source
= Context
->SourceMap
.array
[pos
].value
;
674 if(source
->state
== AL_PLAYING
)
676 source
->state
= AL_STOPPED
;
677 source
->BuffersPlayed
= source
->BuffersInQueue
;
678 source
->position
= 0;
679 source
->position_fraction
= 0;
682 ProcessContext(Context
);
685 device
->Connected
= ALC_FALSE
;
686 ProcessContext(NULL
);