Alc/ALu.c

   1 /**
   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.
   8  *
   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.
  13  *
  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
  19  */
  20
  21 #include "config.h"
  22
  23 #include <math.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <ctype.h>
  27 #include <assert.h>
  28
  29 #include "alMain.h"
  30 #include "AL/al.h"
  31 #include "AL/alc.h"
  32 #include "alSource.h"
  33 #include "alBuffer.h"
  34 #include "alThunk.h"
  35 #include "alListener.h"
  36 #include "alAuxEffectSlot.h"
  37 #include "alu.h"
  38 #include "bs2b.h"
  39
  40 #if defined(HAVE_STDINT_H)
  41 #include <stdint.h>
  42 typedef int64_t ALint64;
  43 #elif defined(HAVE___INT64)
  44 typedef __int64 ALint64;
  45 #elif (SIZEOF_LONG == 8)
  46 typedef long ALint64;
  47 #elif (SIZEOF_LONG_LONG == 8)
  48 typedef long long ALint64;
  49 #endif
  50
  51 #define FRACTIONBITS 14
  52 #define FRACTIONMASK ((1L<<FRACTIONBITS)-1)
  53 #define MAX_PITCH 65536
  54
  55 /* Minimum ramp length in milliseconds. The value below was chosen to
  56  * adequately reduce clicks and pops from harsh gain changes. */
  57 #define MIN_RAMP_LENGTH  16
  58
  59 ALboolean DuplicateStereo = AL_FALSE;
  60
  61
  62 static __inline ALfloat aluF2F(ALfloat Value)
  63 {
  64     if(Value < 0.f) return Value/32768.f;
  65     if(Value > 0.f) return Value/32767.f;
  66     return 0.f;
  67 }
  68
  69 static __inline ALshort aluF2S(ALfloat Value)
  70 {
  71     ALint i;
  72
  73     i = (ALint)Value;
  74     i = __min( 32767, i);
  75     i = __max(-32768, i);
  76     return ((ALshort)i);
  77 }
  78
  79 static __inline ALubyte aluF2UB(ALfloat Value)
  80 {
  81     ALshort i = aluF2S(Value);
  82     return (i>>8)+128;
  83 }
  84
  85
  86 static __inline ALvoid aluCrossproduct(const ALfloat *inVector1, const ALfloat *inVector2, ALfloat *outVector)
  87 {
  88     outVector[0] = inVector1[1]*inVector2[2] - inVector1[2]*inVector2[1];
  89     outVector[1] = inVector1[2]*inVector2[0] - inVector1[0]*inVector2[2];
  90     outVector[2] = inVector1[0]*inVector2[1] - inVector1[1]*inVector2[0];
  91 }
  92
  93 static __inline ALfloat aluDotproduct(const ALfloat *inVector1, const ALfloat *inVector2)
  94 {
  95     return inVector1[0]*inVector2[0] + inVector1[1]*inVector2[1] +
  96            inVector1[2]*inVector2[2];
  97 }
  98
  99 static __inline ALvoid aluNormalize(ALfloat *inVector)
 100 {
 101     ALfloat length, inverse_length;
 102
 103     length = aluSqrt(aluDotproduct(inVector, inVector));
 104     if(length != 0.0f)
 105     {
 106         inverse_length = 1.0f/length;
 107         inVector[0] *= inverse_length;
 108         inVector[1] *= inverse_length;
 109         inVector[2] *= inverse_length;
 110     }
 111 }
 112
 113 static __inline ALvoid aluMatrixVector(ALfloat *vector,ALfloat matrix[3][3])
 114 {
 115     ALfloat result[3];
 116
 117     result[0] = vector[0]*matrix[0][0] + vector[1]*matrix[1][0] + vector[2]*matrix[2][0];
 118     result[1] = vector[0]*matrix[0][1] + vector[1]*matrix[1][1] + vector[2]*matrix[2][1];
 119     result[2] = vector[0]*matrix[0][2] + vector[1]*matrix[1][2] + vector[2]*matrix[2][2];
 120     memcpy(vector, result, sizeof(result));
 121 }
 122
 123 static ALvoid SetSpeakerArrangement(const char *name, ALfloat SpeakerAngle[OUTPUTCHANNELS],
 124                                     ALint Speaker2Chan[OUTPUTCHANNELS], ALint chans)
 125 {
 126     const char *confkey;
 127     const char *next;
 128     const char *sep;
 129     const char *end;
 130     int i, val;
 131
 132     confkey = GetConfigValue(NULL, name, "");
 133     next = confkey;
 134     while(next && *next)
 135     {
 136         confkey = next;
 137         next = strchr(confkey, ',');
 138         if(next)
 139         {
 140             do {
 141                 next++;
 142             } while(isspace(*next));
 143         }
 144
 145         sep = strchr(confkey, '=');
 146         if(!sep || confkey == sep)
 147             continue;
 148
 149         end = sep - 1;
 150         while(isspace(*end) && end != confkey)
 151             end--;
 152         end++;
 153
 154         if(strncmp(confkey, "fl", end-confkey) == 0)
 155             val = FRONT_LEFT;
 156         else if(strncmp(confkey, "fr", end-confkey) == 0)
 157             val = FRONT_RIGHT;
 158         else if(strncmp(confkey, "fc", end-confkey) == 0)
 159             val = FRONT_CENTER;
 160         else if(strncmp(confkey, "bl", end-confkey) == 0)
 161             val = BACK_LEFT;
 162         else if(strncmp(confkey, "br", end-confkey) == 0)
 163             val = BACK_RIGHT;
 164         else if(strncmp(confkey, "bc", end-confkey) == 0)
 165             val = BACK_CENTER;
 166         else if(strncmp(confkey, "sl", end-confkey) == 0)
 167             val = SIDE_LEFT;
 168         else if(strncmp(confkey, "sr", end-confkey) == 0)
 169             val = SIDE_RIGHT;
 170         else
 171         {
 172             AL_PRINT("Unknown speaker for %s: \"%c%c\"\n", name, confkey[0], confkey[1]);
 173             continue;
 174         }
 175
 176         sep++;
 177         while(isspace(*sep))
 178             sep++;
 179
 180         for(i = 0;i < chans;i++)
 181         {
 182             if(Speaker2Chan[i] == val)
 183             {
 184                 val = strtol(sep, NULL, 10);
 185                 if(val >= -180 && val <= 180)
 186                     SpeakerAngle[i] = val * M_PI/180.0f;
 187                 else
 188                     AL_PRINT("Invalid angle for speaker \"%c%c\": %d\n", confkey[0], confkey[1], val);
 189                 break;
 190             }
 191         }
 192     }
 193
 194     for(i = 1;i < chans;i++)
 195     {
 196         if(SpeakerAngle[i] <= SpeakerAngle[i-1])
 197         {
 198             AL_PRINT("Speaker %d of %d does not follow previous: %f > %f\n", i, chans,
 199                      SpeakerAngle[i-1] * 180.0f/M_PI, SpeakerAngle[i] * 180.0f/M_PI);
 200             SpeakerAngle[i] = SpeakerAngle[i-1] + 1 * 180.0f/M_PI;
 201         }
 202     }
 203 }
 204
 205 static __inline ALfloat aluLUTpos2Angle(ALint pos)
 206 {
 207     if(pos < QUADRANT_NUM)
 208         return aluAtan((ALfloat)pos / (ALfloat)(QUADRANT_NUM - pos));
 209     if(pos < 2 * QUADRANT_NUM)
 210         return M_PI_2 + aluAtan((ALfloat)(pos - QUADRANT_NUM) / (ALfloat)(2 * QUADRANT_NUM - pos));
 211     if(pos < 3 * QUADRANT_NUM)
 212         return aluAtan((ALfloat)(pos - 2 * QUADRANT_NUM) / (ALfloat)(3 * QUADRANT_NUM - pos)) - M_PI;
 213     return aluAtan((ALfloat)(pos - 3 * QUADRANT_NUM) / (ALfloat)(4 * QUADRANT_NUM - pos)) - M_PI_2;
 214 }
 215
 216 ALvoid aluInitPanning(ALCcontext *Context)
 217 {
 218     ALint pos, offset, s;
 219     ALfloat Alpha, Theta;
 220     ALfloat SpeakerAngle[OUTPUTCHANNELS];
 221     ALint Speaker2Chan[OUTPUTCHANNELS];
 222
 223     for(s = 0;s < OUTPUTCHANNELS;s++)
 224     {
 225         int s2;
 226         for(s2 = 0;s2 < OUTPUTCHANNELS;s2++)
 227             Context->ChannelMatrix[s][s2] = ((s==s2) ? 1.0f : 0.0f);
 228     }
 229
 230     switch(Context->Device->Format)
 231     {
 232         /* Mono is rendered as stereo, then downmixed during post-process */
 233         case AL_FORMAT_MONO8:
 234         case AL_FORMAT_MONO16:
 235         case AL_FORMAT_MONO_FLOAT32:
 236             Context->ChannelMatrix[FRONT_CENTER][FRONT_LEFT]  = aluSqrt(0.5);
 237             Context->ChannelMatrix[FRONT_CENTER][FRONT_RIGHT] = aluSqrt(0.5);
 238             Context->ChannelMatrix[SIDE_LEFT][FRONT_LEFT]     = 1.0f;
 239             Context->ChannelMatrix[SIDE_RIGHT][FRONT_RIGHT]   = 1.0f;
 240             Context->ChannelMatrix[BACK_LEFT][FRONT_LEFT]     = 1.0f;
 241             Context->ChannelMatrix[BACK_RIGHT][FRONT_RIGHT]   = 1.0f;
 242             Context->ChannelMatrix[BACK_CENTER][FRONT_LEFT]   = aluSqrt(0.5);
 243             Context->ChannelMatrix[BACK_CENTER][FRONT_RIGHT]  = aluSqrt(0.5);
 244             Context->NumChan = 2;
 245             Speaker2Chan[0] = FRONT_LEFT;
 246             Speaker2Chan[1] = FRONT_RIGHT;
 247             SpeakerAngle[0] = -90.0f * M_PI/180.0f;
 248             SpeakerAngle[1] =  90.0f * M_PI/180.0f;
 249             break;
 250
 251         case AL_FORMAT_STEREO8:
 252         case AL_FORMAT_STEREO16:
 253         case AL_FORMAT_STEREO_FLOAT32:
 254             Context->ChannelMatrix[FRONT_CENTER][FRONT_LEFT]  = aluSqrt(0.5);
 255             Context->ChannelMatrix[FRONT_CENTER][FRONT_RIGHT] = aluSqrt(0.5);
 256             Context->ChannelMatrix[SIDE_LEFT][FRONT_LEFT]     = 1.0f;
 257             Context->ChannelMatrix[SIDE_RIGHT][FRONT_RIGHT]   = 1.0f;
 258             Context->ChannelMatrix[BACK_LEFT][FRONT_LEFT]     = 1.0f;
 259             Context->ChannelMatrix[BACK_RIGHT][FRONT_RIGHT]   = 1.0f;
 260             Context->ChannelMatrix[BACK_CENTER][FRONT_LEFT]   = aluSqrt(0.5);
 261             Context->ChannelMatrix[BACK_CENTER][FRONT_RIGHT]  = aluSqrt(0.5);
 262             Context->NumChan = 2;
 263             Speaker2Chan[0] = FRONT_LEFT;
 264             Speaker2Chan[1] = FRONT_RIGHT;
 265             SpeakerAngle[0] = -90.0f * M_PI/180.0f;
 266             SpeakerAngle[1] =  90.0f * M_PI/180.0f;
 267             SetSpeakerArrangement("layout_STEREO", SpeakerAngle, Speaker2Chan, Context->NumChan);
 268             break;
 269
 270         case AL_FORMAT_QUAD8:
 271         case AL_FORMAT_QUAD16:
 272         case AL_FORMAT_QUAD32:
 273             Context->ChannelMatrix[FRONT_CENTER][FRONT_LEFT]  = aluSqrt(0.5);
 274             Context->ChannelMatrix[FRONT_CENTER][FRONT_RIGHT] = aluSqrt(0.5);
 275             Context->ChannelMatrix[SIDE_LEFT][FRONT_LEFT]     = aluSqrt(0.5);
 276             Context->ChannelMatrix[SIDE_LEFT][BACK_LEFT]      = aluSqrt(0.5);
 277             Context->ChannelMatrix[SIDE_RIGHT][FRONT_RIGHT]   = aluSqrt(0.5);
 278             Context->ChannelMatrix[SIDE_RIGHT][BACK_RIGHT]    = aluSqrt(0.5);
 279             Context->ChannelMatrix[BACK_CENTER][BACK_LEFT]    = aluSqrt(0.5);
 280             Context->ChannelMatrix[BACK_CENTER][BACK_RIGHT]   = aluSqrt(0.5);
 281             Context->NumChan = 4;
 282             Speaker2Chan[0] = BACK_LEFT;
 283             Speaker2Chan[1] = FRONT_LEFT;
 284             Speaker2Chan[2] = FRONT_RIGHT;
 285             Speaker2Chan[3] = BACK_RIGHT;
 286             SpeakerAngle[0] = -135.0f * M_PI/180.0f;
 287             SpeakerAngle[1] =  -45.0f * M_PI/180.0f;
 288             SpeakerAngle[2] =   45.0f * M_PI/180.0f;
 289             SpeakerAngle[3] =  135.0f * M_PI/180.0f;
 290             SetSpeakerArrangement("layout_QUAD", SpeakerAngle, Speaker2Chan, Context->NumChan);
 291             break;
 292
 293         case AL_FORMAT_51CHN8:
 294         case AL_FORMAT_51CHN16:
 295         case AL_FORMAT_51CHN32:
 296             Context->ChannelMatrix[SIDE_LEFT][FRONT_LEFT]   = aluSqrt(0.5);
 297             Context->ChannelMatrix[SIDE_LEFT][BACK_LEFT]    = aluSqrt(0.5);
 298             Context->ChannelMatrix[SIDE_RIGHT][FRONT_RIGHT] = aluSqrt(0.5);
 299             Context->ChannelMatrix[SIDE_RIGHT][BACK_RIGHT]  = aluSqrt(0.5);
 300             Context->ChannelMatrix[BACK_CENTER][BACK_LEFT]  = aluSqrt(0.5);
 301             Context->ChannelMatrix[BACK_CENTER][BACK_RIGHT] = aluSqrt(0.5);
 302             Context->NumChan = 5;
 303             Speaker2Chan[0] = BACK_LEFT;
 304             Speaker2Chan[1] = FRONT_LEFT;
 305             Speaker2Chan[2] = FRONT_CENTER;
 306             Speaker2Chan[3] = FRONT_RIGHT;
 307             Speaker2Chan[4] = BACK_RIGHT;
 308             SpeakerAngle[0] = -110.0f * M_PI/180.0f;
 309             SpeakerAngle[1] =  -30.0f * M_PI/180.0f;
 310             SpeakerAngle[2] =    0.0f * M_PI/180.0f;
 311             SpeakerAngle[3] =   30.0f * M_PI/180.0f;
 312             SpeakerAngle[4] =  110.0f * M_PI/180.0f;
 313             SetSpeakerArrangement("layout_51CHN", SpeakerAngle, Speaker2Chan, Context->NumChan);
 314             break;
 315
 316         case AL_FORMAT_61CHN8:
 317         case AL_FORMAT_61CHN16:
 318         case AL_FORMAT_61CHN32:
 319             Context->ChannelMatrix[BACK_LEFT][BACK_CENTER]  = aluSqrt(0.5);
 320             Context->ChannelMatrix[BACK_LEFT][SIDE_LEFT]    = aluSqrt(0.5);
 321             Context->ChannelMatrix[BACK_RIGHT][BACK_CENTER] = aluSqrt(0.5);
 322             Context->ChannelMatrix[BACK_RIGHT][SIDE_RIGHT]  = aluSqrt(0.5);
 323             Context->NumChan = 6;
 324             Speaker2Chan[0] = SIDE_LEFT;
 325             Speaker2Chan[1] = FRONT_LEFT;
 326             Speaker2Chan[2] = FRONT_CENTER;
 327             Speaker2Chan[3] = FRONT_RIGHT;
 328             Speaker2Chan[4] = SIDE_RIGHT;
 329             Speaker2Chan[5] = BACK_CENTER;
 330             SpeakerAngle[0] = -90.0f * M_PI/180.0f;
 331             SpeakerAngle[1] = -30.0f * M_PI/180.0f;
 332             SpeakerAngle[2] =   0.0f * M_PI/180.0f;
 333             SpeakerAngle[3] =  30.0f * M_PI/180.0f;
 334             SpeakerAngle[4] =  90.0f * M_PI/180.0f;
 335             SpeakerAngle[5] = 180.0f * M_PI/180.0f;
 336             SetSpeakerArrangement("layout_61CHN", SpeakerAngle, Speaker2Chan, Context->NumChan);
 337             break;
 338
 339         case AL_FORMAT_71CHN8:
 340         case AL_FORMAT_71CHN16:
 341         case AL_FORMAT_71CHN32:
 342             Context->ChannelMatrix[BACK_CENTER][BACK_LEFT]  = aluSqrt(0.5);
 343             Context->ChannelMatrix[BACK_CENTER][BACK_RIGHT] = aluSqrt(0.5);
 344             Context->NumChan = 7;
 345             Speaker2Chan[0] = BACK_LEFT;
 346             Speaker2Chan[1] = SIDE_LEFT;
 347             Speaker2Chan[2] = FRONT_LEFT;
 348             Speaker2Chan[3] = FRONT_CENTER;
 349             Speaker2Chan[4] = FRONT_RIGHT;
 350             Speaker2Chan[5] = SIDE_RIGHT;
 351             Speaker2Chan[6] = BACK_RIGHT;
 352             SpeakerAngle[0] = -150.0f * M_PI/180.0f;
 353             SpeakerAngle[1] =  -90.0f * M_PI/180.0f;
 354             SpeakerAngle[2] =  -30.0f * M_PI/180.0f;
 355             SpeakerAngle[3] =    0.0f * M_PI/180.0f;
 356             SpeakerAngle[4] =   30.0f * M_PI/180.0f;
 357             SpeakerAngle[5] =   90.0f * M_PI/180.0f;
 358             SpeakerAngle[6] =  150.0f * M_PI/180.0f;
 359             SetSpeakerArrangement("layout_71CHN", SpeakerAngle, Speaker2Chan, Context->NumChan);
 360             break;
 361
 362         default:
 363             assert(0);
 364     }
 365
 366     for(pos = 0; pos < LUT_NUM; pos++)
 367     {
 368         /* source angle */
 369         Theta = aluLUTpos2Angle(pos);
 370
 371         /* clear all values */
 372         offset = OUTPUTCHANNELS * pos;
 373         for(s = 0; s < OUTPUTCHANNELS; s++)
 374             Context->PanningLUT[offset+s] = 0.0f;
 375
 376         /* set panning values */
 377         for(s = 0; s < Context->NumChan - 1; s++)
 378         {
 379             if(Theta >= SpeakerAngle[s] && Theta < SpeakerAngle[s+1])
 380             {
 381                 /* source between speaker s and speaker s+1 */
 382                 Alpha = M_PI_2 * (Theta-SpeakerAngle[s]) /
 383                                  (SpeakerAngle[s+1]-SpeakerAngle[s]);
 384                 Context->PanningLUT[offset + Speaker2Chan[s]]   = cos(Alpha);
 385                 Context->PanningLUT[offset + Speaker2Chan[s+1]] = sin(Alpha);
 386                 break;
 387             }
 388         }
 389         if(s == Context->NumChan - 1)
 390         {
 391             /* source between last and first speaker */
 392             if(Theta < SpeakerAngle[0])
 393                 Theta += 2.0f * M_PI;
 394             Alpha = M_PI_2 * (Theta-SpeakerAngle[s]) /
 395                              (2.0f * M_PI + SpeakerAngle[0]-SpeakerAngle[s]);
 396             Context->PanningLUT[offset + Speaker2Chan[s]] = cos(Alpha);
 397             Context->PanningLUT[offset + Speaker2Chan[0]] = sin(Alpha);
 398         }
 399     }
 400 }
 401
 402 static __inline ALint aluCart2LUTpos(ALfloat re, ALfloat im)
 403 {
 404     ALint pos = 0;
 405     ALfloat denom = aluFabs(re) + aluFabs(im);
 406     if(denom > 0.0f)
 407         pos = (ALint)(QUADRANT_NUM*aluFabs(im) / denom + 0.5);
 408
 409     if(re < 0.0)
 410         pos = 2 * QUADRANT_NUM - pos;
 411     if(im < 0.0)
 412         pos = LUT_NUM - pos;
 413     return pos%LUT_NUM;
 414 }
 415
 416 static ALvoid CalcSourceParams(const ALCcontext *ALContext,
 417                                const ALsource *ALSource, ALenum isMono,
 418                                ALfloat *drysend, ALfloat *wetsend,
 419                                ALfloat *pitch, ALfloat *drygainhf,
 420                                ALfloat *wetgainhf)
 421 {
 422     ALfloat InnerAngle,OuterAngle,Angle,Distance,DryMix;
 423     ALfloat Direction[3],Position[3],SourceToListener[3];
 424     ALfloat MinVolume,MaxVolume,MinDist,MaxDist,Rolloff,OuterGainHF;
 425     ALfloat ConeVolume,ConeHF,SourceVolume,ListenerGain;
 426     ALfloat U[3],V[3],N[3];
 427     ALfloat DopplerFactor, DopplerVelocity, flSpeedOfSound;
 428     ALfloat Matrix[3][3];
 429     ALfloat flAttenuation;
 430     ALfloat RoomAttenuation[MAX_SENDS];
 431     ALfloat MetersPerUnit;
 432     ALfloat RoomRolloff[MAX_SENDS];
 433     ALfloat DryGainHF = 1.0f;
 434     ALfloat DirGain, AmbientGain;
 435     ALfloat length;
 436     const ALfloat *SpeakerGain;
 437     ALint NumSends;
 438     ALint pos, s, i;
 439
 440     //Get context properties
 441     DopplerFactor   = ALContext->DopplerFactor * ALSource->DopplerFactor;
 442     DopplerVelocity = ALContext->DopplerVelocity;
 443     flSpeedOfSound  = ALContext->flSpeedOfSound;
 444     NumSends        = ALContext->Device->NumAuxSends;
 445
 446     //Get listener properties
 447     ListenerGain = ALContext->Listener.Gain;
 448     MetersPerUnit = ALContext->Listener.MetersPerUnit;
 449
 450     //Get source properties
 451     SourceVolume = ALSource->flGain;
 452     memcpy(Position,  ALSource->vPosition,    sizeof(ALSource->vPosition));
 453     memcpy(Direction, ALSource->vOrientation, sizeof(ALSource->vOrientation));
 454     MinVolume    = ALSource->flMinGain;
 455     MaxVolume    = ALSource->flMaxGain;
 456     MinDist      = ALSource->flRefDistance;
 457     MaxDist      = ALSource->flMaxDistance;
 458     Rolloff      = ALSource->flRollOffFactor;
 459     InnerAngle   = ALSource->flInnerAngle;
 460     OuterAngle   = ALSource->flOuterAngle;
 461     OuterGainHF  = ALSource->OuterGainHF;
 462
 463     //Only apply 3D calculations for mono buffers
 464     if(isMono == AL_FALSE)
 465     {
 466         //1. Multi-channel buffers always play "normal"
 467         pitch[0] = ALSource->flPitch;
 468
 469         DryMix = SourceVolume;
 470         DryMix = __min(DryMix,MaxVolume);
 471         DryMix = __max(DryMix,MinVolume);
 472
 473         switch(ALSource->DirectFilter.type)
 474         {
 475             case AL_FILTER_LOWPASS:
 476                 DryMix *= ALSource->DirectFilter.Gain;
 477                 DryGainHF *= ALSource->DirectFilter.GainHF;
 478                 break;
 479         }
 480
 481         drysend[FRONT_LEFT]   = DryMix * ListenerGain;
 482         drysend[FRONT_RIGHT]  = DryMix * ListenerGain;
 483         drysend[SIDE_LEFT]    = DryMix * ListenerGain;
 484         drysend[SIDE_RIGHT]   = DryMix * ListenerGain;
 485         drysend[BACK_LEFT]    = DryMix * ListenerGain;
 486         drysend[BACK_RIGHT]   = DryMix * ListenerGain;
 487         drysend[FRONT_CENTER] = DryMix * ListenerGain;
 488         drysend[BACK_CENTER]  = DryMix * ListenerGain;
 489         drysend[LFE]          = DryMix * ListenerGain;
 490         *drygainhf            = DryGainHF;
 491
 492         for(i = 0;i < MAX_SENDS;i++)
 493         {
 494             wetsend[i] = 0.0f;
 495             wetgainhf[i] = 1.0f;
 496         }
 497
 498         return;
 499     }
 500
 501     //1. Translate Listener to origin (convert to head relative)
 502     // Note that Direction and SourceToListener are *not* transformed.
 503     // SourceToListener is used with the source and listener velocities,
 504     // which are untransformed, and Direction is used with SourceToListener
 505     // for the sound cone
 506     if(ALSource->bHeadRelative==AL_FALSE)
 507     {
 508         // Build transform matrix
 509         aluCrossproduct(ALContext->Listener.Forward, ALContext->Listener.Up, U); // Right-vector
 510         aluNormalize(U);  // Normalized Right-vector
 511         memcpy(V, ALContext->Listener.Up, sizeof(V));   // Up-vector
 512         aluNormalize(V);  // Normalized Up-vector
 513         memcpy(N, ALContext->Listener.Forward, sizeof(N));  // At-vector
 514         aluNormalize(N);  // Normalized At-vector
 515         Matrix[0][0] = U[0]; Matrix[0][1] = V[0]; Matrix[0][2] = -N[0];
 516         Matrix[1][0] = U[1]; Matrix[1][1] = V[1]; Matrix[1][2] = -N[1];
 517         Matrix[2][0] = U[2]; Matrix[2][1] = V[2]; Matrix[2][2] = -N[2];
 518
 519         // Translate source position into listener space
 520         Position[0] -= ALContext->Listener.Position[0];
 521         Position[1] -= ALContext->Listener.Position[1];
 522         Position[2] -= ALContext->Listener.Position[2];
 523
 524         SourceToListener[0] = -Position[0];
 525         SourceToListener[1] = -Position[1];
 526         SourceToListener[2] = -Position[2];
 527
 528         // Transform source position into listener space
 529         aluMatrixVector(Position, Matrix);
 530     }
 531     else
 532     {
 533         SourceToListener[0] = -Position[0];
 534         SourceToListener[1] = -Position[1];
 535         SourceToListener[2] = -Position[2];
 536     }
 537     aluNormalize(SourceToListener);
 538     aluNormalize(Direction);
 539
 540     //2. Calculate distance attenuation
 541     Distance = aluSqrt(aluDotproduct(Position, Position));
 542
 543     flAttenuation = 1.0f;
 544     for(i = 0;i < MAX_SENDS;i++)
 545     {
 546         RoomAttenuation[i] = 1.0f;
 547
 548         RoomRolloff[i] = ALSource->RoomRolloffFactor;
 549         if(ALSource->Send[i].Slot &&
 550            ALSource->Send[i].Slot->effect.type == AL_EFFECT_REVERB)
 551             RoomRolloff[i] += ALSource->Send[i].Slot->effect.Reverb.RoomRolloffFactor;
 552     }
 553
 554     switch(ALSource->DistanceModel)
 555     {
 556         case AL_INVERSE_DISTANCE_CLAMPED:
 557             Distance=__max(Distance,MinDist);
 558             Distance=__min(Distance,MaxDist);
 559             if(MaxDist < MinDist)
 560                 break;
 561             //fall-through
 562         case AL_INVERSE_DISTANCE:
 563             if(MinDist > 0.0f)
 564             {
 565                 if((MinDist + (Rolloff * (Distance - MinDist))) > 0.0f)
 566                     flAttenuation = MinDist / (MinDist + (Rolloff * (Distance - MinDist)));
 567                 for(i = 0;i < NumSends;i++)
 568                 {
 569                     if((MinDist + (RoomRolloff[i] * (Distance - MinDist))) > 0.0f)
 570                         RoomAttenuation[i] = MinDist / (MinDist + (RoomRolloff[i] * (Distance - MinDist)));
 571                 }
 572             }
 573             break;
 574
 575         case AL_LINEAR_DISTANCE_CLAMPED:
 576             Distance=__max(Distance,MinDist);
 577             Distance=__min(Distance,MaxDist);
 578             if(MaxDist < MinDist)
 579                 break;
 580             //fall-through
 581         case AL_LINEAR_DISTANCE:
 582             Distance=__min(Distance,MaxDist);
 583             if(MaxDist != MinDist)
 584             {
 585                 flAttenuation = 1.0f - (Rolloff*(Distance-MinDist)/(MaxDist - MinDist));
 586                 for(i = 0;i < NumSends;i++)
 587                     RoomAttenuation[i] = 1.0f - (RoomRolloff[i]*(Distance-MinDist)/(MaxDist - MinDist));
 588             }
 589             break;
 590
 591         case AL_EXPONENT_DISTANCE_CLAMPED:
 592             Distance=__max(Distance,MinDist);
 593             Distance=__min(Distance,MaxDist);
 594             if(MaxDist < MinDist)
 595                 break;
 596             //fall-through
 597         case AL_EXPONENT_DISTANCE:
 598             if(Distance > 0.0f && MinDist > 0.0f)
 599             {
 600                 flAttenuation = (ALfloat)pow(Distance/MinDist, -Rolloff);
 601                 for(i = 0;i < NumSends;i++)
 602                     RoomAttenuation[i] = (ALfloat)pow(Distance/MinDist, -RoomRolloff[i]);
 603             }
 604             break;
 605
 606         case AL_NONE:
 607             break;
 608     }
 609
 610     // Source Gain + Attenuation and clamp to Min/Max Gain
 611     DryMix = SourceVolume * flAttenuation;
 612     DryMix = __min(DryMix,MaxVolume);
 613     DryMix = __max(DryMix,MinVolume);
 614
 615     for(i = 0;i < NumSends;i++)
 616     {
 617         ALfloat WetMix = SourceVolume * RoomAttenuation[i];
 618         WetMix = __min(WetMix,MaxVolume);
 619         wetsend[i] = __max(WetMix,MinVolume);
 620         wetgainhf[i] = 1.0f;
 621     }
 622
 623     // Distance-based air absorption
 624     if(ALSource->AirAbsorptionFactor > 0.0f && ALSource->DistanceModel != AL_NONE)
 625     {
 626         ALfloat dist = Distance-MinDist;
 627         ALfloat absorb;
 628
 629         if(dist < 0.0f) dist = 0.0f;
 630         // Absorption calculation is done in dB
 631         absorb = (ALSource->AirAbsorptionFactor*AIRABSORBGAINDBHF) *
 632                  (dist*MetersPerUnit);
 633         // Convert dB to linear gain before applying
 634         absorb = pow(10.0, absorb/20.0);
 635         DryGainHF *= absorb;
 636         for(i = 0;i < MAX_SENDS;i++)
 637             wetgainhf[i] *= absorb;
 638     }
 639
 640     //3. Apply directional soundcones
 641     Angle = aluAcos(aluDotproduct(Direction,SourceToListener)) * 180.0f/M_PI;
 642     if(Angle >= InnerAngle && Angle <= OuterAngle)
 643     {
 644         ALfloat scale = (Angle-InnerAngle) / (OuterAngle-InnerAngle);
 645         ConeVolume = (1.0f+(ALSource->flOuterGain-1.0f)*scale);
 646         ConeHF = (1.0f+(OuterGainHF-1.0f)*scale);
 647         DryMix *= ConeVolume;
 648         if(ALSource->DryGainHFAuto)
 649             DryGainHF *= ConeHF;
 650     }
 651     else if(Angle > OuterAngle)
 652     {
 653         ConeVolume = (1.0f+(ALSource->flOuterGain-1.0f));
 654         ConeHF = (1.0f+(OuterGainHF-1.0f));
 655         DryMix *= ConeVolume;
 656         if(ALSource->DryGainHFAuto)
 657             DryGainHF *= ConeHF;
 658     }
 659     else
 660     {
 661         ConeVolume = 1.0f;
 662         ConeHF = 1.0f;
 663     }
 664
 665     //4. Calculate Velocity
 666     if(DopplerFactor != 0.0f)
 667     {
 668         ALfloat flVSS, flVLS = 0.0f;
 669         ALfloat flMaxVelocity = (DopplerVelocity * flSpeedOfSound) /
 670                                 DopplerFactor;
 671
 672         flVSS = aluDotproduct(ALSource->vVelocity, SourceToListener);
 673         if(flVSS >= flMaxVelocity)
 674             flVSS = (flMaxVelocity - 1.0f);
 675         else if(flVSS <= -flMaxVelocity)
 676             flVSS = -flMaxVelocity + 1.0f;
 677
 678         if(ALSource->bHeadRelative == AL_FALSE)
 679         {
 680             flVLS = aluDotproduct(ALContext->Listener.Velocity, SourceToListener);
 681             if(flVLS >= flMaxVelocity)
 682                 flVLS = (flMaxVelocity - 1.0f);
 683             else if(flVLS <= -flMaxVelocity)
 684                 flVLS = -flMaxVelocity + 1.0f;
 685         }
 686
 687         pitch[0] = ALSource->flPitch *
 688                    ((flSpeedOfSound * DopplerVelocity) - (DopplerFactor * flVLS)) /
 689                    ((flSpeedOfSound * DopplerVelocity) - (DopplerFactor * flVSS));
 690     }
 691     else
 692         pitch[0] = ALSource->flPitch;
 693
 694     for(i = 0;i < NumSends;i++)
 695     {
 696         if(ALSource->Send[i].Slot &&
 697            ALSource->Send[i].Slot->effect.type != AL_EFFECT_NULL)
 698         {
 699             if(ALSource->WetGainAuto)
 700                 wetsend[i] *= ConeVolume;
 701             if(ALSource->WetGainHFAuto)
 702                 wetgainhf[i] *= ConeHF;
 703
 704             if(ALSource->Send[i].Slot->AuxSendAuto)
 705             {
 706                 // Apply minimal attenuation in place of missing
 707                 // statistical reverb model.
 708                 wetsend[i] *= pow(DryMix, 1.0f / 2.0f);
 709             }
 710             else
 711             {
 712                 // If the slot's auxiliary send auto is off, the data sent to
 713                 // the effect slot is the same as the dry path, sans filter
 714                 // effects
 715                 wetsend[i] = DryMix;
 716                 wetgainhf[i] = DryGainHF;
 717             }
 718
 719             switch(ALSource->Send[i].WetFilter.type)
 720             {
 721                 case AL_FILTER_LOWPASS:
 722                     wetsend[i] *= ALSource->Send[i].WetFilter.Gain;
 723                     wetgainhf[i] *= ALSource->Send[i].WetFilter.GainHF;
 724                     break;
 725             }
 726             wetsend[i] *= ListenerGain;
 727         }
 728         else
 729         {
 730             wetsend[i] = 0.0f;
 731             wetgainhf[i] = 1.0f;
 732         }
 733     }
 734     for(i = NumSends;i < MAX_SENDS;i++)
 735     {
 736         wetsend[i] = 0.0f;
 737         wetgainhf[i] = 1.0f;
 738     }
 739
 740     //5. Apply filter gains and filters
 741     switch(ALSource->DirectFilter.type)
 742     {
 743         case AL_FILTER_LOWPASS:
 744             DryMix *= ALSource->DirectFilter.Gain;
 745             DryGainHF *= ALSource->DirectFilter.GainHF;
 746             break;
 747     }
 748     DryMix *= ListenerGain;
 749
 750     // Use energy-preserving panning algorithm for multi-speaker playback
 751     length = aluSqrt(Position[0]*Position[0] + Position[1]*Position[1] +
 752                      Position[2]*Position[2]);
 753     length = __max(length, MinDist);
 754     if(length > 0.0f)
 755     {
 756         ALfloat invlen = 1.0f/length;
 757         Position[0] *= invlen;
 758         Position[1] *= invlen;
 759         Position[2] *= invlen;
 760     }
 761
 762     pos = aluCart2LUTpos(-Position[2], Position[0]);
 763     SpeakerGain = &ALContext->PanningLUT[OUTPUTCHANNELS * pos];
 764
 765     DirGain = aluSqrt(Position[0]*Position[0] + Position[2]*Position[2]);
 766     // elevation adjustment for directional gain. this sucks, but
 767     // has low complexity
 768     AmbientGain = 1.0/aluSqrt(ALContext->NumChan) * (1.0-DirGain);
 769     for(s = 0; s < OUTPUTCHANNELS; s++)
 770     {
 771         ALfloat gain = SpeakerGain[s]*DirGain + AmbientGain;
 772         drysend[s] = DryMix * gain;
 773     }
 774     *drygainhf = DryGainHF;
 775 }
 776
 777 static __inline ALshort lerp(ALshort val1, ALshort val2, ALint frac)
 778 {
 779     return val1 + (((val2-val1)*frac)>>FRACTIONBITS);
 780 }
 781
 782 static void MixSomeSources(ALCcontext *ALContext, float (*DryBuffer)[OUTPUTCHANNELS], ALuint SamplesToDo)
 783 {
 784     static float DummyBuffer[BUFFERSIZE];
 785     ALfloat *WetBuffer[MAX_SENDS];
 786     ALfloat (*Matrix)[OUTPUTCHANNELS] = ALContext->ChannelMatrix;
 787     ALfloat DrySend[OUTPUTCHANNELS] = { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f };
 788     ALfloat dryGainStep[OUTPUTCHANNELS];
 789     ALfloat wetGainStep[MAX_SENDS];
 790     ALuint i, j, k, out;
 791     ALsource *ALSource;
 792     ALfloat value;
 793     ALshort *Data;
 794     ALbufferlistitem *BufferListItem;
 795     ALint64 DataSize64,DataPos64;
 796     FILTER *DryFilter, *WetFilter[MAX_SENDS];
 797     ALfloat WetSend[MAX_SENDS];
 798     ALfloat DryGainHF = 0.0f;
 799     ALfloat WetGainHF[MAX_SENDS];
 800     ALuint rampLength;
 801     ALuint frequency;
 802     ALint Looping,State;
 803     ALint increment;
 804
 805     if(!(ALSource=ALContext->Source))
 806         return;
 807
 808     frequency = ALContext->Device->Frequency;
 809
 810     rampLength = frequency * MIN_RAMP_LENGTH / 1000;
 811     rampLength = max(rampLength, SamplesToDo);
 812
 813 another_source:
 814     j = 0;
 815     State = ALSource->state;
 816     while(State == AL_PLAYING && j < SamplesToDo)
 817     {
 818         ALuint DataSize = 0;
 819         ALuint DataPosInt = 0;
 820         ALuint DataPosFrac = 0;
 821         ALuint Buffer;
 822         ALbuffer *ALBuffer;
 823         ALuint Channels, Frequency;
 824         ALuint BufferSize;
 825         ALfloat Pitch;
 826
 827         /* Get buffer info */
 828         if(!(Buffer = ALSource->ulBufferID))
 829             goto skipmix;
 830         ALBuffer = (ALbuffer*)ALTHUNK_LOOKUPENTRY(Buffer);
 831
 832         Data      = ALBuffer->data;
 833         Channels  = aluChannelsFromFormat(ALBuffer->format);
 834         DataSize  = ALBuffer->size;
 835         DataSize /= Channels * aluBytesFromFormat(ALBuffer->format);
 836         Frequency = ALBuffer->frequency;
 837
 838         DataPosInt = ALSource->position;
 839         DataPosFrac = ALSource->position_fraction;
 840
 841         if(DataPosInt >= DataSize)
 842             goto skipmix;
 843
 844         /* Get source info */
 845         DryFilter = &ALSource->iirFilter;
 846         for(i = 0;i < MAX_SENDS;i++)
 847         {
 848             WetFilter[i] = &ALSource->Send[i].iirFilter;
 849             WetBuffer[i] = (ALSource->Send[i].Slot ?
 850                             ALSource->Send[i].Slot->WetBuffer :
 851                             DummyBuffer);
 852         }
 853
 854         CalcSourceParams(ALContext, ALSource, (Channels==1)?AL_TRUE:AL_FALSE,
 855                          DrySend, WetSend, &Pitch, &DryGainHF, WetGainHF);
 856         Pitch = (Pitch*Frequency) / frequency;
 857
 858         if(Channels == 1)
 859         {
 860             ALfloat cw, a, g;
 861
 862             /* Update filter coefficients. Calculations based on the I3DL2
 863              * spec. */
 864             cw = cos(2.0*M_PI * LOWPASSFREQCUTOFF / frequency);
 865             /* We use four chained one-pole filters, so we need to take the
 866              * fourth root of the squared gain, which is the same as the square
 867              * root of the base gain. */
 868             /* Be careful with gains < 0.0001, as that causes the coefficient
 869              * head towards 1, which will flatten the signal */
 870             g = aluSqrt(__max(DryGainHF, 0.0001f));
 871             a = 0.0f;
 872             if(g < 0.9999f) /* 1-epsilon */
 873                 a = (1 - g*cw - aluSqrt(2*g*(1-cw) - g*g*(1 - cw*cw))) /
 874                     (1 - g);
 875             DryFilter->coeff = a;
 876
 877             for(i = 0;i < MAX_SENDS;i++)
 878             {
 879                 /* The wet path uses two chained one-pole filters, so take the
 880                  * base gain (square root of the squared gain) */
 881                 g = __max(WetGainHF[i], 0.01f);
 882                 a = 0.0f;
 883                 if(g < 0.9999f) /* 1-epsilon */
 884                     a = (1 - g*cw - aluSqrt(2*g*(1-cw) - g*g*(1 - cw*cw))) /
 885                         (1 - g);
 886                 WetFilter[i]->coeff = a;
 887             }
 888         }
 889         else
 890         {
 891             ALfloat cw, a, g;
 892
 893             /* Multi-channel sources use two chained one-pole filters */
 894             cw = cos(2.0*M_PI * LOWPASSFREQCUTOFF / frequency);
 895             g = __max(DryGainHF, 0.01f);
 896             a = 0.0f;
 897             if(g < 0.9999f) /* 1-epsilon */
 898                 a = (1 - g*cw - aluSqrt(2*g*(1-cw) - g*g*(1 - cw*cw))) /
 899                     (1 - g);
 900             DryFilter->coeff = a;
 901             for(i = 0;i < MAX_SENDS;i++)
 902                 WetFilter[i]->coeff = 0.0f;
 903
 904             if(DuplicateStereo && Channels == 2)
 905             {
 906                 Matrix[FRONT_LEFT][SIDE_LEFT]   = 1.0f;
 907                 Matrix[FRONT_RIGHT][SIDE_RIGHT] = 1.0f;
 908                 Matrix[FRONT_LEFT][BACK_LEFT]   = 1.0f;
 909                 Matrix[FRONT_RIGHT][BACK_RIGHT] = 1.0f;
 910             }
 911             else if(DuplicateStereo)
 912             {
 913                 Matrix[FRONT_LEFT][SIDE_LEFT]   = 0.0f;
 914                 Matrix[FRONT_RIGHT][SIDE_RIGHT] = 0.0f;
 915                 Matrix[FRONT_LEFT][BACK_LEFT]   = 0.0f;
 916                 Matrix[FRONT_RIGHT][BACK_RIGHT] = 0.0f;
 917             }
 918         }
 919
 920         /* Compute the gain steps for each output channel */
 921         if(ALSource->FirstStart)
 922         {
 923             ALSource->FirstStart = AL_FALSE;
 924             for(i = 0;i < OUTPUTCHANNELS;i++)
 925                 dryGainStep[i] = 0.0f;
 926             for(i = 0;i < MAX_SENDS;i++)
 927                 wetGainStep[i] = 0.0f;
 928         }
 929         else
 930         {
 931             for(i = 0;i < OUTPUTCHANNELS;i++)
 932             {
 933                 dryGainStep[i] = (DrySend[i]-ALSource->DryGains[i]) / rampLength;
 934                 DrySend[i] = ALSource->DryGains[i];
 935             }
 936             for(i = 0;i < MAX_SENDS;i++)
 937             {
 938                 wetGainStep[i] = (WetSend[i]-ALSource->WetGains[i]) / rampLength;
 939                 WetSend[i] = ALSource->WetGains[i];
 940             }
 941         }
 942
 943         /* Compute 18.14 fixed point step */
 944         if(Pitch > (float)MAX_PITCH)
 945             Pitch = (float)MAX_PITCH;
 946         increment = (ALint)(Pitch*(ALfloat)(1L<<FRACTIONBITS));
 947         if(increment <= 0)
 948             increment = (1<<FRACTIONBITS);
 949
 950         /* Figure out how many samples we can mix. */
 951         DataSize64 = DataSize;
 952         DataSize64 <<= FRACTIONBITS;
 953         DataPos64 = DataPosInt;
 954         DataPos64 <<= FRACTIONBITS;
 955         DataPos64 += DataPosFrac;
 956         BufferSize = (ALuint)((DataSize64-DataPos64+(increment-1)) / increment);
 957
 958         BufferListItem = ALSource->queue;
 959         for(i = 0;i < ALSource->BuffersPlayed && BufferListItem;i++)
 960             BufferListItem = BufferListItem->next;
 961         if(BufferListItem)
 962         {
 963             ALbuffer *NextBuf;
 964             ALuint ulExtraSamples;
 965
 966             if(BufferListItem->next)
 967             {
 968                 NextBuf = (ALbuffer*)ALTHUNK_LOOKUPENTRY(BufferListItem->next->buffer);
 969                 if(NextBuf && NextBuf->data)
 970                 {
 971                     ulExtraSamples = min(NextBuf->size, (ALint)(ALBuffer->padding*Channels*2));
 972                     memcpy(&Data[DataSize*Channels], NextBuf->data, ulExtraSamples);
 973                 }
 974             }
 975             else if(ALSource->bLooping)
 976             {
 977                 NextBuf = (ALbuffer*)ALTHUNK_LOOKUPENTRY(ALSource->queue->buffer);
 978                 if(NextBuf && NextBuf->data)
 979                 {
 980                     ulExtraSamples = min(NextBuf->size, (ALint)(ALBuffer->padding*Channels*2));
 981                     memcpy(&Data[DataSize*Channels], NextBuf->data, ulExtraSamples);
 982                 }
 983             }
 984             else
 985                 memset(&Data[DataSize*Channels], 0, (ALBuffer->padding*Channels*2));
 986         }
 987         BufferSize = min(BufferSize, (SamplesToDo-j));
 988
 989         /* Actual sample mixing loop */
 990         k = 0;
 991         Data += DataPosInt*Channels;
 992
 993         if(Channels == 1) /* Mono */
 994         {
 995             ALfloat outsamp;
 996
 997             while(BufferSize--)
 998             {
 999                 for(i = 0;i < OUTPUTCHANNELS;i++)
1000                     DrySend[i] += dryGainStep[i];
1001                 for(i = 0;i < MAX_SENDS;i++)
1002                     WetSend[i] += wetGainStep[i];
1003
1004                 /* First order interpolator */
1005                 value = lerp(Data[k], Data[k+1], DataPosFrac);
1006
1007                 /* Direct path final mix buffer and panning */
1008                 outsamp = lpFilter4P(DryFilter, 0, value);
1009                 DryBuffer[j][FRONT_LEFT]   += outsamp*DrySend[FRONT_LEFT];
1010                 DryBuffer[j][FRONT_RIGHT]  += outsamp*DrySend[FRONT_RIGHT];
1011                 DryBuffer[j][SIDE_LEFT]    += outsamp*DrySend[SIDE_LEFT];
1012                 DryBuffer[j][SIDE_RIGHT]   += outsamp*DrySend[SIDE_RIGHT];
1013                 DryBuffer[j][BACK_LEFT]    += outsamp*DrySend[BACK_LEFT];
1014                 DryBuffer[j][BACK_RIGHT]   += outsamp*DrySend[BACK_RIGHT];
1015                 DryBuffer[j][FRONT_CENTER] += outsamp*DrySend[FRONT_CENTER];
1016                 DryBuffer[j][BACK_CENTER]  += outsamp*DrySend[BACK_CENTER];
1017
1018                 /* Room path final mix buffer and panning */
1019                 for(i = 0;i < MAX_SENDS;i++)
1020                 {
1021                     outsamp = lpFilter2P(WetFilter[i], 0, value);
1022                     WetBuffer[i][j] += outsamp*WetSend[i];
1023                 }
1024
1025                 DataPosFrac += increment;
1026                 k += DataPosFrac>>FRACTIONBITS;
1027                 DataPosFrac &= FRACTIONMASK;
1028                 j++;
1029             }
1030         }
1031         else if(Channels == 2) /* Stereo */
1032         {
1033             const int chans[] = {
1034                 FRONT_LEFT, FRONT_RIGHT
1035             };
1036
1037 #define DO_MIX() do { \
1038     for(i = 0;i < MAX_SENDS;i++) \
1039         WetSend[i] += wetGainStep[i]*BufferSize; \
1040     while(BufferSize--) \
1041     { \
1042         for(i = 0;i < OUTPUTCHANNELS;i++) \
1043             DrySend[i] += dryGainStep[i]; \
1044  \
1045         for(i = 0;i < Channels;i++) \
1046         { \
1047             value = lerp(Data[k*Channels + i], Data[(k+1)*Channels + i], DataPosFrac); \
1048             value = lpFilter2P(DryFilter, chans[i]*2, value)*DrySend[chans[i]]; \
1049             for(out = 0;out < OUTPUTCHANNELS;out++) \
1050                 DryBuffer[j][out] += value*Matrix[chans[i]][out]; \
1051         } \
1052  \
1053         DataPosFrac += increment; \
1054         k += DataPosFrac>>FRACTIONBITS; \
1055         DataPosFrac &= FRACTIONMASK; \
1056         j++; \
1057     } \
1058 } while(0)
1059
1060             DO_MIX();
1061         }
1062         else if(Channels == 4) /* Quad */
1063         {
1064             const int chans[] = {
1065                 FRONT_LEFT, FRONT_RIGHT,
1066                 BACK_LEFT,  BACK_RIGHT
1067             };
1068
1069             DO_MIX();
1070         }
1071         else if(Channels == 6) /* 5.1 */
1072         {
1073             const int chans[] = {
1074                 FRONT_LEFT,   FRONT_RIGHT,
1075                 FRONT_CENTER, LFE,
1076                 BACK_LEFT,    BACK_RIGHT
1077             };
1078
1079             DO_MIX();
1080         }
1081         else if(Channels == 7) /* 6.1 */
1082         {
1083             const int chans[] = {
1084                 FRONT_LEFT,   FRONT_RIGHT,
1085                 FRONT_CENTER, LFE,
1086                 BACK_CENTER,
1087                 SIDE_LEFT,    SIDE_RIGHT
1088             };
1089
1090             DO_MIX();
1091         }
1092         else if(Channels == 8) /* 7.1 */
1093         {
1094             const int chans[] = {
1095                 FRONT_LEFT,   FRONT_RIGHT,
1096                 FRONT_CENTER, LFE,
1097                 BACK_LEFT,    BACK_RIGHT,
1098                 SIDE_LEFT,    SIDE_RIGHT
1099             };
1100
1101             DO_MIX();
1102 #undef DO_MIX
1103         }
1104         else /* Unknown? */
1105         {
1106             for(i = 0;i < OUTPUTCHANNELS;i++)
1107                 DrySend[i] += dryGainStep[i]*BufferSize;
1108             for(i = 0;i < MAX_SENDS;i++)
1109                 WetSend[i] += wetGainStep[i]*BufferSize;
1110             while(BufferSize--)
1111             {
1112                 DataPosFrac += increment;
1113                 k += DataPosFrac>>FRACTIONBITS;
1114                 DataPosFrac &= FRACTIONMASK;
1115                 j++;
1116             }
1117         }
1118         DataPosInt += k;
1119
1120         /* Update source info */
1121         ALSource->position = DataPosInt;
1122         ALSource->position_fraction = DataPosFrac;
1123         for(i = 0;i < OUTPUTCHANNELS;i++)
1124             ALSource->DryGains[i] = DrySend[i];
1125         for(i = 0;i < MAX_SENDS;i++)
1126             ALSource->WetGains[i] = WetSend[i];
1127
1128     skipmix:
1129         /* Handle looping sources */
1130         if(!Buffer || DataPosInt >= DataSize)
1131         {
1132             /* Queueing */
1133             if(ALSource->queue)
1134             {
1135                 Looping = ALSource->bLooping;
1136                 if(ALSource->BuffersPlayed < (ALSource->BuffersInQueue-1))
1137                 {
1138                     BufferListItem = ALSource->queue;
1139                     for(i = 0;i <= ALSource->BuffersPlayed && BufferListItem;i++)
1140                     {
1141                         if(!Looping)
1142                             BufferListItem->bufferstate = PROCESSED;
1143                         BufferListItem = BufferListItem->next;
1144                     }
1145                     if(BufferListItem)
1146                         ALSource->ulBufferID = BufferListItem->buffer;
1147                     ALSource->position = DataPosInt-DataSize;
1148                     ALSource->position_fraction = DataPosFrac;
1149                     ALSource->BuffersPlayed++;
1150                 }
1151                 else
1152                 {
1153                     if(!Looping)
1154                     {
1155                         /* alSourceStop */
1156                         ALSource->state = AL_STOPPED;
1157                         ALSource->inuse = AL_FALSE;
1158                         ALSource->BuffersPlayed = ALSource->BuffersInQueue;
1159                         BufferListItem = ALSource->queue;
1160                         while(BufferListItem != NULL)
1161                         {
1162                             BufferListItem->bufferstate = PROCESSED;
1163                             BufferListItem = BufferListItem->next;
1164                         }
1165                         ALSource->position = 0;
1166                         ALSource->position_fraction = 0;
1167                     }
1168                     else
1169                     {
1170                         /* alSourceRewind */
1171                         /* alSourcePlay */
1172                         ALSource->state = AL_PLAYING;
1173                         ALSource->inuse = AL_TRUE;
1174                         ALSource->play = AL_TRUE;
1175                         ALSource->BuffersPlayed = 0;
1176                         BufferListItem = ALSource->queue;
1177                         while(BufferListItem != NULL)
1178                         {
1179                             BufferListItem->bufferstate = PENDING;
1180                             BufferListItem = BufferListItem->next;
1181                         }
1182                         ALSource->ulBufferID = ALSource->queue->buffer;
1183
1184                         if(ALSource->BuffersInQueue == 1)
1185                             ALSource->position = DataPosInt%DataSize;
1186                         else
1187                             ALSource->position = DataPosInt-DataSize;
1188                         ALSource->position_fraction = DataPosFrac;
1189                     }
1190                 }
1191             }
1192         }
1193
1194         /* Get source state */
1195         State = ALSource->state;
1196     }
1197
1198     if((ALSource=ALSource->next) != NULL)
1199         goto another_source;
1200 }
1201
1202 ALvoid aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size)
1203 {
1204     float (*DryBuffer)[OUTPUTCHANNELS];
1205     ALuint SamplesToDo;
1206     ALeffectslot *ALEffectSlot;
1207     ALCcontext *ALContext;
1208     int fpuState;
1209     ALuint i, c;
1210
1211     SuspendContext(NULL);
1212
1213 #if defined(HAVE_FESETROUND)
1214     fpuState = fegetround();
1215     fesetround(FE_TOWARDZERO);
1216 #elif defined(HAVE__CONTROLFP)
1217     fpuState = _controlfp(0, 0);
1218     _controlfp(_RC_CHOP, _MCW_RC);
1219 #else
1220     (void)fpuState;
1221 #endif
1222
1223     DryBuffer = device->DryBuffer;
1224     while(size > 0)
1225     {
1226         /* Setup variables */
1227         SamplesToDo = min(size, BUFFERSIZE);
1228
1229         /* Clear mixing buffer */
1230         memset(DryBuffer, 0, SamplesToDo*OUTPUTCHANNELS*sizeof(ALfloat));
1231
1232         for(c = 0;c < device->NumContexts;c++)
1233         {
1234             ALContext = device->Contexts[c];
1235             SuspendContext(ALContext);
1236
1237             MixSomeSources(ALContext, DryBuffer, SamplesToDo);
1238
1239             /* effect slot processing */
1240             ALEffectSlot = ALContext->AuxiliaryEffectSlot;
1241             while(ALEffectSlot)
1242             {
1243                 if(ALEffectSlot->EffectState)
1244                     ALEffect_Process(ALEffectSlot->EffectState, ALEffectSlot, SamplesToDo, ALEffectSlot->WetBuffer, DryBuffer);
1245
1246                 for(i = 0;i < SamplesToDo;i++)
1247                     ALEffectSlot->WetBuffer[i] = 0.0f;
1248                 ALEffectSlot = ALEffectSlot->next;
1249             }
1250             ProcessContext(ALContext);
1251         }
1252
1253         //Post processing loop
1254         switch(device->Format)
1255         {
1256 #define CHECK_WRITE_FORMAT(bits, type, func, isWin)                           \
1257         case AL_FORMAT_MONO##bits:                                            \
1258             for(i = 0;i < SamplesToDo;i++)                                    \
1259             {                                                                 \
1260                 ((type*)buffer)[0] = (func)(DryBuffer[i][FRONT_LEFT] +        \
1261                                             DryBuffer[i][FRONT_RIGHT]);       \
1262                 buffer = ((type*)buffer) + 1;                                 \
1263             }                                                                 \
1264             break;                                                            \
1265         case AL_FORMAT_STEREO##bits:                                          \
1266             if(device->Bs2b)                                                  \
1267             {                                                                 \
1268                 for(i = 0;i < SamplesToDo;i++)                                \
1269                 {                                                             \
1270                     float samples[2];                                         \
1271                     samples[0] = DryBuffer[i][FRONT_LEFT];                    \
1272                     samples[1] = DryBuffer[i][FRONT_RIGHT];                   \
1273                     bs2b_cross_feed(device->Bs2b, samples);                   \
1274                     ((type*)buffer)[0] = (func)(samples[0]);                  \
1275                     ((type*)buffer)[1] = (func)(samples[1]);                  \
1276                     buffer = ((type*)buffer) + 2;                             \
1277                 }                                                             \
1278             }                                                                 \
1279             else                                                              \
1280             {                                                                 \
1281                 for(i = 0;i < SamplesToDo;i++)                                \
1282                 {                                                             \
1283                     ((type*)buffer)[0] = (func)(DryBuffer[i][FRONT_LEFT]);    \
1284                     ((type*)buffer)[1] = (func)(DryBuffer[i][FRONT_RIGHT]);   \
1285                     buffer = ((type*)buffer) + 2;                             \
1286                 }                                                             \
1287             }                                                                 \
1288             break;                                                            \
1289         case AL_FORMAT_QUAD##bits:                                            \
1290             for(i = 0;i < SamplesToDo;i++)                                    \
1291             {                                                                 \
1292                 ((type*)buffer)[0] = (func)(DryBuffer[i][FRONT_LEFT]);        \
1293                 ((type*)buffer)[1] = (func)(DryBuffer[i][FRONT_RIGHT]);       \
1294                 ((type*)buffer)[2] = (func)(DryBuffer[i][BACK_LEFT]);         \
1295                 ((type*)buffer)[3] = (func)(DryBuffer[i][BACK_RIGHT]);        \
1296                 buffer = ((type*)buffer) + 4;                                 \
1297             }                                                                 \
1298             break;                                                            \
1299         case AL_FORMAT_51CHN##bits:                                           \
1300             for(i = 0;i < SamplesToDo;i++)                                    \
1301             {                                                                 \
1302                 ((type*)buffer)[0] = (func)(DryBuffer[i][FRONT_LEFT]);        \
1303                 ((type*)buffer)[1] = (func)(DryBuffer[i][FRONT_RIGHT]);       \
1304                 if(isWin) {                                                   \
1305                     /* Of course, Windows can't use the same ordering... */   \
1306                     ((type*)buffer)[2] = (func)(DryBuffer[i][FRONT_CENTER]);  \
1307                     ((type*)buffer)[3] = (func)(DryBuffer[i][LFE]);           \
1308                     ((type*)buffer)[4] = (func)(DryBuffer[i][BACK_LEFT]);     \
1309                     ((type*)buffer)[5] = (func)(DryBuffer[i][BACK_RIGHT]);    \
1310                 } else {                                                      \
1311                     ((type*)buffer)[2] = (func)(DryBuffer[i][BACK_LEFT]);     \
1312                     ((type*)buffer)[3] = (func)(DryBuffer[i][BACK_RIGHT]);    \
1313                     ((type*)buffer)[4] = (func)(DryBuffer[i][FRONT_CENTER]);  \
1314                     ((type*)buffer)[5] = (func)(DryBuffer[i][LFE]);           \
1315                 }                                                             \
1316                 buffer = ((type*)buffer) + 6;                                 \
1317             }                                                                 \
1318             break;                                                            \
1319         case AL_FORMAT_61CHN##bits:                                           \
1320             for(i = 0;i < SamplesToDo;i++)                                    \
1321             {                                                                 \
1322                 ((type*)buffer)[0] = (func)(DryBuffer[i][FRONT_LEFT]);        \
1323                 ((type*)buffer)[1] = (func)(DryBuffer[i][FRONT_RIGHT]);       \
1324                 ((type*)buffer)[2] = (func)(DryBuffer[i][FRONT_CENTER]);      \
1325                 ((type*)buffer)[3] = (func)(DryBuffer[i][LFE]);               \
1326                 ((type*)buffer)[4] = (func)(DryBuffer[i][BACK_CENTER]);       \
1327                 ((type*)buffer)[5] = (func)(DryBuffer[i][SIDE_LEFT]);         \
1328                 ((type*)buffer)[6] = (func)(DryBuffer[i][SIDE_RIGHT]);        \
1329                 buffer = ((type*)buffer) + 7;                                 \
1330             }                                                                 \
1331             break;                                                            \
1332         case AL_FORMAT_71CHN##bits:                                           \
1333             for(i = 0;i < SamplesToDo;i++)                                    \
1334             {                                                                 \
1335                 ((type*)buffer)[0] = (func)(DryBuffer[i][FRONT_LEFT]);        \
1336                 ((type*)buffer)[1] = (func)(DryBuffer[i][FRONT_RIGHT]);       \
1337                 if(isWin) {                                                   \
1338                     ((type*)buffer)[2] = (func)(DryBuffer[i][FRONT_CENTER]);  \
1339                     ((type*)buffer)[3] = (func)(DryBuffer[i][LFE]);           \
1340                     ((type*)buffer)[4] = (func)(DryBuffer[i][BACK_LEFT]);     \
1341                     ((type*)buffer)[5] = (func)(DryBuffer[i][BACK_RIGHT]);    \
1342                 } else {                                                      \
1343                     ((type*)buffer)[2] = (func)(DryBuffer[i][BACK_LEFT]);     \
1344                     ((type*)buffer)[3] = (func)(DryBuffer[i][BACK_RIGHT]);    \
1345                     ((type*)buffer)[4] = (func)(DryBuffer[i][FRONT_CENTER]);  \
1346                     ((type*)buffer)[5] = (func)(DryBuffer[i][LFE]);           \
1347                 }                                                             \
1348                 ((type*)buffer)[6] = (func)(DryBuffer[i][SIDE_LEFT]);         \
1349                 ((type*)buffer)[7] = (func)(DryBuffer[i][SIDE_RIGHT]);        \
1350                 buffer = ((type*)buffer) + 8;                                 \
1351             }                                                                 \
1352             break;
1353
1354 #define AL_FORMAT_MONO32 AL_FORMAT_MONO_FLOAT32
1355 #define AL_FORMAT_STEREO32 AL_FORMAT_STEREO_FLOAT32
1356 #ifdef _WIN32
1357             CHECK_WRITE_FORMAT(8,  ALubyte, aluF2UB, 1)
1358             CHECK_WRITE_FORMAT(16, ALshort, aluF2S, 1)
1359             CHECK_WRITE_FORMAT(32, ALfloat, aluF2F, 1)
1360 #else
1361             CHECK_WRITE_FORMAT(8,  ALubyte, aluF2UB, 0)
1362             CHECK_WRITE_FORMAT(16, ALshort, aluF2S, 0)
1363             CHECK_WRITE_FORMAT(32, ALfloat, aluF2F, 0)
1364 #endif
1365 #undef AL_FORMAT_STEREO32
1366 #undef AL_FORMAT_MONO32
1367 #undef CHECK_WRITE_FORMAT
1368
1369             default:
1370                 break;
1371         }
1372
1373         size -= SamplesToDo;
1374     }
1375
1376 #if defined(HAVE_FESETROUND)
1377     fesetround(fpuState);
1378 #elif defined(HAVE__CONTROLFP)
1379     _controlfp(fpuState, 0xfffff);
1380 #endif
1381
1382     ProcessContext(NULL);
1383 }
1384
1385 ALvoid aluHandleDisconnect(ALCdevice *device)
1386 {
1387     ALuint i;
1388
1389     for(i = 0;i < device->NumContexts;i++)
1390     {
1391         ALsource *source;
1392
1393         SuspendContext(device->Contexts[i]);
1394
1395         source = device->Contexts[i]->Source;
1396         while(source)
1397         {
1398             if(source->state == AL_PLAYING)
1399             {
1400                 ALbufferlistitem *BufferListItem;
1401
1402                 source->state = AL_STOPPED;
1403                 source->inuse = AL_FALSE;
1404                 source->BuffersPlayed = source->BuffersInQueue;
1405                 BufferListItem = source->queue;
1406                 while(BufferListItem != NULL)
1407                 {
1408                     BufferListItem->bufferstate = PROCESSED;
1409                     BufferListItem = BufferListItem->next;
1410                 }
1411                 source->position = 0;
1412                 source->position_fraction = 0;
1413             }
1414             source = source->next;
1415         }
1416         ProcessContext(device->Contexts[i]);
1417     }
1418
1419     device->Connected = ALC_FALSE;
1420 }