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, ALsource *ALSource,
 417                                ALboolean isMono)
 418 {
 419     ALfloat InnerAngle,OuterAngle,Angle,Distance,DryMix;
 420     ALfloat Direction[3],Position[3],SourceToListener[3];
 421     ALfloat MinVolume,MaxVolume,MinDist,MaxDist,Rolloff,OuterGainHF;
 422     ALfloat ConeVolume,ConeHF,SourceVolume,ListenerGain;
 423     ALfloat U[3],V[3],N[3];
 424     ALfloat DopplerFactor, DopplerVelocity, flSpeedOfSound;
 425     ALfloat Matrix[3][3];
 426     ALfloat flAttenuation;
 427     ALfloat RoomAttenuation[MAX_SENDS];
 428     ALfloat MetersPerUnit;
 429     ALfloat RoomRolloff[MAX_SENDS];
 430     ALfloat DryGainHF = 1.0f;
 431     ALfloat WetGain[MAX_SENDS];
 432     ALfloat WetGainHF[MAX_SENDS];
 433     ALfloat DirGain, AmbientGain;
 434     ALfloat length;
 435     const ALfloat *SpeakerGain;
 436     ALuint Frequency;
 437     ALint NumSends;
 438     ALint pos, s, i;
 439     ALfloat cw, a, g;
 440
 441     //Get context properties
 442     DopplerFactor   = ALContext->DopplerFactor * ALSource->DopplerFactor;
 443     DopplerVelocity = ALContext->DopplerVelocity;
 444     flSpeedOfSound  = ALContext->flSpeedOfSound;
 445     NumSends        = ALContext->Device->NumAuxSends;
 446     Frequency       = ALContext->Device->Frequency;
 447
 448     //Get listener properties
 449     ListenerGain = ALContext->Listener.Gain;
 450     MetersPerUnit = ALContext->Listener.MetersPerUnit;
 451
 452     //Get source properties
 453     SourceVolume = ALSource->flGain;
 454     memcpy(Position,  ALSource->vPosition,    sizeof(ALSource->vPosition));
 455     memcpy(Direction, ALSource->vOrientation, sizeof(ALSource->vOrientation));
 456     MinVolume    = ALSource->flMinGain;
 457     MaxVolume    = ALSource->flMaxGain;
 458     MinDist      = ALSource->flRefDistance;
 459     MaxDist      = ALSource->flMaxDistance;
 460     Rolloff      = ALSource->flRollOffFactor;
 461     InnerAngle   = ALSource->flInnerAngle;
 462     OuterAngle   = ALSource->flOuterAngle;
 463     OuterGainHF  = ALSource->OuterGainHF;
 464
 465     //Only apply 3D calculations for mono buffers
 466     if(isMono == AL_FALSE)
 467     {
 468         //1. Multi-channel buffers always play "normal"
 469         ALSource->Params.Pitch = ALSource->flPitch;
 470
 471         DryMix = SourceVolume;
 472         DryMix = __min(DryMix,MaxVolume);
 473         DryMix = __max(DryMix,MinVolume);
 474
 475         switch(ALSource->DirectFilter.type)
 476         {
 477             case AL_FILTER_LOWPASS:
 478                 DryMix *= ALSource->DirectFilter.Gain;
 479                 DryGainHF *= ALSource->DirectFilter.GainHF;
 480                 break;
 481         }
 482
 483         ALSource->Params.DryGains[FRONT_LEFT]   = DryMix * ListenerGain;
 484         ALSource->Params.DryGains[FRONT_RIGHT]  = DryMix * ListenerGain;
 485         ALSource->Params.DryGains[SIDE_LEFT]    = DryMix * ListenerGain;
 486         ALSource->Params.DryGains[SIDE_RIGHT]   = DryMix * ListenerGain;
 487         ALSource->Params.DryGains[BACK_LEFT]    = DryMix * ListenerGain;
 488         ALSource->Params.DryGains[BACK_RIGHT]   = DryMix * ListenerGain;
 489         ALSource->Params.DryGains[FRONT_CENTER] = DryMix * ListenerGain;
 490         ALSource->Params.DryGains[BACK_CENTER]  = DryMix * ListenerGain;
 491         ALSource->Params.DryGains[LFE]          = DryMix * ListenerGain;
 492         for(i = 0;i < MAX_SENDS;i++)
 493             ALSource->Params.WetGains[i] = 0.0f;
 494
 495         /* Update filter coefficients. Calculations based on the I3DL2
 496          * spec. */
 497         cw = cos(2.0*M_PI * LOWPASSFREQCUTOFF / Frequency);
 498         /* We use two chained one-pole filters, so we need to take the
 499          * square root of the squared gain, which is the same as the base
 500          * gain. */
 501         g = __max(DryGainHF, 0.01f);
 502         a = 0.0f;
 503         /* Be careful with gains < 0.0001, as that causes the coefficient
 504          * head towards 1, which will flatten the signal */
 505         if(g < 0.9999f) /* 1-epsilon */
 506             a = (1 - g*cw - aluSqrt(2*g*(1-cw) - g*g*(1 - cw*cw))) /
 507                 (1 - g);
 508         ALSource->Params.iirFilter.coeff = a;
 509         for(i = 0;i < MAX_SENDS;i++)
 510             ALSource->Params.Send[i].iirFilter.coeff = 0.0f;
 511
 512         return;
 513     }
 514
 515     //1. Translate Listener to origin (convert to head relative)
 516     // Note that Direction and SourceToListener are *not* transformed.
 517     // SourceToListener is used with the source and listener velocities,
 518     // which are untransformed, and Direction is used with SourceToListener
 519     // for the sound cone
 520     if(ALSource->bHeadRelative==AL_FALSE)
 521     {
 522         // Build transform matrix
 523         aluCrossproduct(ALContext->Listener.Forward, ALContext->Listener.Up, U); // Right-vector
 524         aluNormalize(U);  // Normalized Right-vector
 525         memcpy(V, ALContext->Listener.Up, sizeof(V));   // Up-vector
 526         aluNormalize(V);  // Normalized Up-vector
 527         memcpy(N, ALContext->Listener.Forward, sizeof(N));  // At-vector
 528         aluNormalize(N);  // Normalized At-vector
 529         Matrix[0][0] = U[0]; Matrix[0][1] = V[0]; Matrix[0][2] = -N[0];
 530         Matrix[1][0] = U[1]; Matrix[1][1] = V[1]; Matrix[1][2] = -N[1];
 531         Matrix[2][0] = U[2]; Matrix[2][1] = V[2]; Matrix[2][2] = -N[2];
 532
 533         // Translate source position into listener space
 534         Position[0] -= ALContext->Listener.Position[0];
 535         Position[1] -= ALContext->Listener.Position[1];
 536         Position[2] -= ALContext->Listener.Position[2];
 537
 538         SourceToListener[0] = -Position[0];
 539         SourceToListener[1] = -Position[1];
 540         SourceToListener[2] = -Position[2];
 541
 542         // Transform source position into listener space
 543         aluMatrixVector(Position, Matrix);
 544     }
 545     else
 546     {
 547         SourceToListener[0] = -Position[0];
 548         SourceToListener[1] = -Position[1];
 549         SourceToListener[2] = -Position[2];
 550     }
 551     aluNormalize(SourceToListener);
 552     aluNormalize(Direction);
 553
 554     //2. Calculate distance attenuation
 555     Distance = aluSqrt(aluDotproduct(Position, Position));
 556
 557     flAttenuation = 1.0f;
 558     for(i = 0;i < MAX_SENDS;i++)
 559     {
 560         RoomAttenuation[i] = 1.0f;
 561
 562         RoomRolloff[i] = ALSource->RoomRolloffFactor;
 563         if(ALSource->Send[i].Slot &&
 564            ALSource->Send[i].Slot->effect.type == AL_EFFECT_REVERB)
 565             RoomRolloff[i] += ALSource->Send[i].Slot->effect.Reverb.RoomRolloffFactor;
 566     }
 567
 568     switch(ALSource->DistanceModel)
 569     {
 570         case AL_INVERSE_DISTANCE_CLAMPED:
 571             Distance=__max(Distance,MinDist);
 572             Distance=__min(Distance,MaxDist);
 573             if(MaxDist < MinDist)
 574                 break;
 575             //fall-through
 576         case AL_INVERSE_DISTANCE:
 577             if(MinDist > 0.0f)
 578             {
 579                 if((MinDist + (Rolloff * (Distance - MinDist))) > 0.0f)
 580                     flAttenuation = MinDist / (MinDist + (Rolloff * (Distance - MinDist)));
 581                 for(i = 0;i < NumSends;i++)
 582                 {
 583                     if((MinDist + (RoomRolloff[i] * (Distance - MinDist))) > 0.0f)
 584                         RoomAttenuation[i] = MinDist / (MinDist + (RoomRolloff[i] * (Distance - MinDist)));
 585                 }
 586             }
 587             break;
 588
 589         case AL_LINEAR_DISTANCE_CLAMPED:
 590             Distance=__max(Distance,MinDist);
 591             Distance=__min(Distance,MaxDist);
 592             if(MaxDist < MinDist)
 593                 break;
 594             //fall-through
 595         case AL_LINEAR_DISTANCE:
 596             Distance=__min(Distance,MaxDist);
 597             if(MaxDist != MinDist)
 598             {
 599                 flAttenuation = 1.0f - (Rolloff*(Distance-MinDist)/(MaxDist - MinDist));
 600                 for(i = 0;i < NumSends;i++)
 601                     RoomAttenuation[i] = 1.0f - (RoomRolloff[i]*(Distance-MinDist)/(MaxDist - MinDist));
 602             }
 603             break;
 604
 605         case AL_EXPONENT_DISTANCE_CLAMPED:
 606             Distance=__max(Distance,MinDist);
 607             Distance=__min(Distance,MaxDist);
 608             if(MaxDist < MinDist)
 609                 break;
 610             //fall-through
 611         case AL_EXPONENT_DISTANCE:
 612             if(Distance > 0.0f && MinDist > 0.0f)
 613             {
 614                 flAttenuation = (ALfloat)pow(Distance/MinDist, -Rolloff);
 615                 for(i = 0;i < NumSends;i++)
 616                     RoomAttenuation[i] = (ALfloat)pow(Distance/MinDist, -RoomRolloff[i]);
 617             }
 618             break;
 619
 620         case AL_NONE:
 621             break;
 622     }
 623
 624     // Source Gain + Attenuation and clamp to Min/Max Gain
 625     DryMix = SourceVolume * flAttenuation;
 626     DryMix = __min(DryMix,MaxVolume);
 627     DryMix = __max(DryMix,MinVolume);
 628
 629     for(i = 0;i < NumSends;i++)
 630     {
 631         ALfloat WetMix = SourceVolume * RoomAttenuation[i];
 632         WetMix = __min(WetMix,MaxVolume);
 633         WetGain[i] = __max(WetMix,MinVolume);
 634         WetGainHF[i] = 1.0f;
 635     }
 636
 637     // Distance-based air absorption
 638     if(ALSource->AirAbsorptionFactor > 0.0f && ALSource->DistanceModel != AL_NONE)
 639     {
 640         ALfloat dist = Distance-MinDist;
 641         ALfloat absorb;
 642
 643         if(dist < 0.0f) dist = 0.0f;
 644         // Absorption calculation is done in dB
 645         absorb = (ALSource->AirAbsorptionFactor*AIRABSORBGAINDBHF) *
 646                  (dist*MetersPerUnit);
 647         // Convert dB to linear gain before applying
 648         absorb = pow(10.0, absorb/20.0);
 649         DryGainHF *= absorb;
 650         for(i = 0;i < MAX_SENDS;i++)
 651             WetGainHF[i] *= absorb;
 652     }
 653
 654     //3. Apply directional soundcones
 655     Angle = aluAcos(aluDotproduct(Direction,SourceToListener)) * 180.0f/M_PI;
 656     if(Angle >= InnerAngle && Angle <= OuterAngle)
 657     {
 658         ALfloat scale = (Angle-InnerAngle) / (OuterAngle-InnerAngle);
 659         ConeVolume = (1.0f+(ALSource->flOuterGain-1.0f)*scale);
 660         ConeHF = (1.0f+(OuterGainHF-1.0f)*scale);
 661         DryMix *= ConeVolume;
 662         if(ALSource->DryGainHFAuto)
 663             DryGainHF *= ConeHF;
 664     }
 665     else if(Angle > OuterAngle)
 666     {
 667         ConeVolume = (1.0f+(ALSource->flOuterGain-1.0f));
 668         ConeHF = (1.0f+(OuterGainHF-1.0f));
 669         DryMix *= ConeVolume;
 670         if(ALSource->DryGainHFAuto)
 671             DryGainHF *= ConeHF;
 672     }
 673     else
 674     {
 675         ConeVolume = 1.0f;
 676         ConeHF = 1.0f;
 677     }
 678
 679     //4. Calculate Velocity
 680     if(DopplerFactor != 0.0f)
 681     {
 682         ALfloat flVSS, flVLS = 0.0f;
 683         ALfloat flMaxVelocity = (DopplerVelocity * flSpeedOfSound) /
 684                                 DopplerFactor;
 685
 686         flVSS = aluDotproduct(ALSource->vVelocity, SourceToListener);
 687         if(flVSS >= flMaxVelocity)
 688             flVSS = (flMaxVelocity - 1.0f);
 689         else if(flVSS <= -flMaxVelocity)
 690             flVSS = -flMaxVelocity + 1.0f;
 691
 692         if(ALSource->bHeadRelative == AL_FALSE)
 693         {
 694             flVLS = aluDotproduct(ALContext->Listener.Velocity, SourceToListener);
 695             if(flVLS >= flMaxVelocity)
 696                 flVLS = (flMaxVelocity - 1.0f);
 697             else if(flVLS <= -flMaxVelocity)
 698                 flVLS = -flMaxVelocity + 1.0f;
 699         }
 700
 701         ALSource->Params.Pitch = ALSource->flPitch *
 702             ((flSpeedOfSound * DopplerVelocity) - (DopplerFactor * flVLS)) /
 703             ((flSpeedOfSound * DopplerVelocity) - (DopplerFactor * flVSS));
 704     }
 705     else
 706         ALSource->Params.Pitch = ALSource->flPitch;
 707
 708     for(i = 0;i < NumSends;i++)
 709     {
 710         if(ALSource->Send[i].Slot &&
 711            ALSource->Send[i].Slot->effect.type != AL_EFFECT_NULL)
 712         {
 713             if(ALSource->Send[i].Slot->AuxSendAuto)
 714             {
 715                 if(ALSource->WetGainAuto)
 716                     WetGain[i] *= ConeVolume;
 717                 if(ALSource->WetGainHFAuto)
 718                     WetGainHF[i] *= ConeHF;
 719
 720                 // Apply minimal attenuation in place of missing
 721                 // statistical reverb model.
 722                 WetGain[i] *= pow(DryMix, 1.0f / 2.0f);
 723             }
 724             else
 725             {
 726                 // If the slot's auxiliary send auto is off, the data sent to
 727                 // the effect slot is the same as the dry path, sans filter
 728                 // effects
 729                 WetGain[i] = DryMix;
 730                 WetGainHF[i] = DryGainHF;
 731             }
 732
 733             switch(ALSource->Send[i].WetFilter.type)
 734             {
 735                 case AL_FILTER_LOWPASS:
 736                     WetGain[i] *= ALSource->Send[i].WetFilter.Gain;
 737                     WetGainHF[i] *= ALSource->Send[i].WetFilter.GainHF;
 738                     break;
 739             }
 740             ALSource->Params.WetGains[i] = WetGain[i] * ListenerGain;
 741         }
 742         else
 743         {
 744             ALSource->Params.WetGains[i] = 0.0f;
 745             WetGainHF[i] = 1.0f;
 746         }
 747     }
 748     for(i = NumSends;i < MAX_SENDS;i++)
 749     {
 750         ALSource->Params.WetGains[i] = 0.0f;
 751         WetGainHF[i] = 1.0f;
 752     }
 753
 754     //5. Apply filter gains and filters
 755     switch(ALSource->DirectFilter.type)
 756     {
 757         case AL_FILTER_LOWPASS:
 758             DryMix *= ALSource->DirectFilter.Gain;
 759             DryGainHF *= ALSource->DirectFilter.GainHF;
 760             break;
 761     }
 762     DryMix *= ListenerGain;
 763
 764     // Use energy-preserving panning algorithm for multi-speaker playback
 765     length = aluSqrt(Position[0]*Position[0] + Position[1]*Position[1] +
 766                      Position[2]*Position[2]);
 767     length = __max(length, MinDist);
 768     if(length > 0.0f)
 769     {
 770         ALfloat invlen = 1.0f/length;
 771         Position[0] *= invlen;
 772         Position[1] *= invlen;
 773         Position[2] *= invlen;
 774     }
 775
 776     pos = aluCart2LUTpos(-Position[2], Position[0]);
 777     SpeakerGain = &ALContext->PanningLUT[OUTPUTCHANNELS * pos];
 778
 779     DirGain = aluSqrt(Position[0]*Position[0] + Position[2]*Position[2]);
 780     // elevation adjustment for directional gain. this sucks, but
 781     // has low complexity
 782     AmbientGain = 1.0/aluSqrt(ALContext->NumChan) * (1.0-DirGain);
 783     for(s = 0; s < OUTPUTCHANNELS; s++)
 784     {
 785         ALfloat gain = SpeakerGain[s]*DirGain + AmbientGain;
 786         ALSource->Params.DryGains[s] = DryMix * gain;
 787     }
 788
 789     /* Update filter coefficients. */
 790     cw = cos(2.0*M_PI * LOWPASSFREQCUTOFF / Frequency);
 791     /* Spatialized sources use four chained one-pole filters, so we need to
 792      * take the fourth root of the squared gain, which is the same as the
 793      * square root of the base gain. */
 794     g = aluSqrt(__max(DryGainHF, 0.0001f));
 795     a = 0.0f;
 796     if(g < 0.9999f) /* 1-epsilon */
 797         a = (1 - g*cw - aluSqrt(2*g*(1-cw) - g*g*(1 - cw*cw))) /
 798             (1 - g);
 799     ALSource->Params.iirFilter.coeff = a;
 800
 801     for(i = 0;i < NumSends;i++)
 802     {
 803         /* The wet path uses two chained one-pole filters, so take the
 804          * base gain (square root of the squared gain) */
 805         g = __max(WetGainHF[i], 0.01f);
 806         a = 0.0f;
 807         if(g < 0.9999f) /* 1-epsilon */
 808             a = (1 - g*cw - aluSqrt(2*g*(1-cw) - g*g*(1 - cw*cw))) /
 809                 (1 - g);
 810         ALSource->Params.Send[i].iirFilter.coeff = a;
 811     }
 812 }
 813
 814 static __inline ALshort lerp(ALshort val1, ALshort val2, ALint frac)
 815 {
 816     return val1 + (((val2-val1)*frac)>>FRACTIONBITS);
 817 }
 818
 819 static void MixSomeSources(ALCcontext *ALContext, float (*DryBuffer)[OUTPUTCHANNELS], ALuint SamplesToDo)
 820 {
 821     static float DummyBuffer[BUFFERSIZE];
 822     ALfloat *WetBuffer[MAX_SENDS];
 823     ALfloat (*Matrix)[OUTPUTCHANNELS] = ALContext->ChannelMatrix;
 824     ALfloat DrySend[OUTPUTCHANNELS];
 825     ALfloat dryGainStep[OUTPUTCHANNELS];
 826     ALfloat wetGainStep[MAX_SENDS];
 827     ALuint i, j, k, out;
 828     ALsource *ALSource;
 829     ALfloat value;
 830     ALbufferlistitem *BufferListItem;
 831     ALint64 DataSize64,DataPos64;
 832     FILTER *DryFilter, *WetFilter[MAX_SENDS];
 833     ALfloat WetSend[MAX_SENDS];
 834     ALuint rampLength;
 835     ALuint frequency;
 836     ALint increment;
 837     ALuint DataPosInt, DataPosFrac;
 838     ALuint Channels, Bytes;
 839     ALuint BuffersPlayed;
 840     ALfloat Pitch;
 841     ALenum State;
 842
 843     if(!(ALSource=ALContext->Source))
 844         return;
 845
 846     frequency = ALContext->Device->Frequency;
 847
 848     rampLength = frequency * MIN_RAMP_LENGTH / 1000;
 849     rampLength = max(rampLength, SamplesToDo);
 850
 851 another_source:
 852     State = ALSource->state;
 853     if(State != AL_PLAYING)
 854     {
 855         if((ALSource=ALSource->next) != NULL)
 856             goto another_source;
 857         return;
 858     }
 859     j = 0;
 860
 861     /* Get source info */
 862     BuffersPlayed = ALSource->BuffersPlayed;
 863     DataPosInt    = ALSource->position;
 864     DataPosFrac   = ALSource->position_fraction;
 865
 866     Channels = aluChannelsFromFormat(ALSource->Format);
 867     Bytes    = aluBytesFromFormat(ALSource->Format);
 868
 869     CalcSourceParams(ALContext, ALSource, (Channels==1)?AL_TRUE:AL_FALSE);
 870
 871     /* Compute 18.14 fixed point step */
 872     Pitch = (ALSource->Params.Pitch*ALSource->Frequency) / frequency;
 873     if(Pitch > (float)MAX_PITCH)  Pitch = (float)MAX_PITCH;
 874     increment = (ALint)(Pitch*(ALfloat)(1L<<FRACTIONBITS));
 875     if(increment <= 0)  increment = (1<<FRACTIONBITS);
 876
 877     /* Compute the gain steps for each output channel */
 878     if(ALSource->FirstStart)
 879     {
 880         for(i = 0;i < OUTPUTCHANNELS;i++)
 881             DrySend[i] = ALSource->Params.DryGains[i];
 882         for(i = 0;i < MAX_SENDS;i++)
 883             WetSend[i] = ALSource->Params.WetGains[i];
 884     }
 885     else
 886     {
 887         for(i = 0;i < OUTPUTCHANNELS;i++)
 888             DrySend[i] = ALSource->DryGains[i];
 889         for(i = 0;i < MAX_SENDS;i++)
 890             WetSend[i] = ALSource->WetGains[i];
 891     }
 892
 893     DryFilter = &ALSource->Params.iirFilter;
 894     for(i = 0;i < MAX_SENDS;i++)
 895     {
 896         WetFilter[i] = &ALSource->Params.Send[i].iirFilter;
 897         WetBuffer[i] = (ALSource->Send[i].Slot ?
 898                         ALSource->Send[i].Slot->WetBuffer :
 899                         DummyBuffer);
 900     }
 901
 902     if(DuplicateStereo && Channels == 2)
 903     {
 904         Matrix[FRONT_LEFT][SIDE_LEFT]   = 1.0f;
 905         Matrix[FRONT_RIGHT][SIDE_RIGHT] = 1.0f;
 906         Matrix[FRONT_LEFT][BACK_LEFT]   = 1.0f;
 907         Matrix[FRONT_RIGHT][BACK_RIGHT] = 1.0f;
 908     }
 909     else if(DuplicateStereo)
 910     {
 911         Matrix[FRONT_LEFT][SIDE_LEFT]   = 0.0f;
 912         Matrix[FRONT_RIGHT][SIDE_RIGHT] = 0.0f;
 913         Matrix[FRONT_LEFT][BACK_LEFT]   = 0.0f;
 914         Matrix[FRONT_RIGHT][BACK_RIGHT] = 0.0f;
 915     }
 916
 917     BufferListItem = ALSource->queue;
 918     for(i = 0;i < BuffersPlayed && BufferListItem;i++)
 919         BufferListItem = BufferListItem->next;
 920
 921     while(State == AL_PLAYING && j < SamplesToDo)
 922     {
 923         ALuint DataSize = 0;
 924         ALbuffer *ALBuffer;
 925         ALshort *Data;
 926         ALuint BufferSize;
 927
 928         /* Get buffer info */
 929         if((ALBuffer=BufferListItem->buffer) != NULL)
 930         {
 931             Data      = ALBuffer->data;
 932             DataSize  = ALBuffer->size;
 933             DataSize /= Channels * Bytes;
 934         }
 935         if(DataPosInt >= DataSize)
 936             goto skipmix;
 937
 938         if(BufferListItem->next)
 939         {
 940             ALbuffer *NextBuf = BufferListItem->next->buffer;
 941             if(NextBuf && NextBuf->data)
 942             {
 943                 ALuint ulExtraSamples = min(NextBuf->size, (ALint)(ALBuffer->padding*Channels*Bytes));
 944                 memcpy(&Data[DataSize*Channels], NextBuf->data, ulExtraSamples);
 945             }
 946         }
 947         else if(ALSource->bLooping)
 948         {
 949             ALbuffer *NextBuf = ALSource->queue->buffer;
 950             if(NextBuf && NextBuf->data)
 951             {
 952                 ALuint ulExtraSamples = min(NextBuf->size, (ALint)(ALBuffer->padding*Channels*Bytes));
 953                 memcpy(&Data[DataSize*Channels], NextBuf->data, ulExtraSamples);
 954             }
 955         }
 956         else
 957             memset(&Data[DataSize*Channels], 0, (ALBuffer->padding*Channels*Bytes));
 958
 959         /* Compute the gain steps for each output channel */
 960         for(i = 0;i < OUTPUTCHANNELS;i++)
 961             dryGainStep[i] = (ALSource->Params.DryGains[i]-
 962                               DrySend[i]) / rampLength;
 963         for(i = 0;i < MAX_SENDS;i++)
 964             wetGainStep[i] = (ALSource->Params.WetGains[i]-
 965                               WetSend[i]) / rampLength;
 966
 967         /* Figure out how many samples we can mix. */
 968         DataSize64 = DataSize;
 969         DataSize64 <<= FRACTIONBITS;
 970         DataPos64 = DataPosInt;
 971         DataPos64 <<= FRACTIONBITS;
 972         DataPos64 += DataPosFrac;
 973         BufferSize = (ALuint)((DataSize64-DataPos64+(increment-1)) / increment);
 974
 975         BufferSize = min(BufferSize, (SamplesToDo-j));
 976
 977         /* Actual sample mixing loop */
 978         k = 0;
 979         Data += DataPosInt*Channels;
 980
 981         if(Channels == 1) /* Mono */
 982         {
 983             ALfloat outsamp;
 984
 985             while(BufferSize--)
 986             {
 987                 for(i = 0;i < OUTPUTCHANNELS;i++)
 988                     DrySend[i] += dryGainStep[i];
 989                 for(i = 0;i < MAX_SENDS;i++)
 990                     WetSend[i] += wetGainStep[i];
 991
 992                 /* First order interpolator */
 993                 value = lerp(Data[k], Data[k+1], DataPosFrac);
 994
 995                 /* Direct path final mix buffer and panning */
 996                 outsamp = lpFilter4P(DryFilter, 0, value);
 997                 DryBuffer[j][FRONT_LEFT]   += outsamp*DrySend[FRONT_LEFT];
 998                 DryBuffer[j][FRONT_RIGHT]  += outsamp*DrySend[FRONT_RIGHT];
 999                 DryBuffer[j][SIDE_LEFT]    += outsamp*DrySend[SIDE_LEFT];
1000                 DryBuffer[j][SIDE_RIGHT]   += outsamp*DrySend[SIDE_RIGHT];
1001                 DryBuffer[j][BACK_LEFT]    += outsamp*DrySend[BACK_LEFT];
1002                 DryBuffer[j][BACK_RIGHT]   += outsamp*DrySend[BACK_RIGHT];
1003                 DryBuffer[j][FRONT_CENTER] += outsamp*DrySend[FRONT_CENTER];
1004                 DryBuffer[j][BACK_CENTER]  += outsamp*DrySend[BACK_CENTER];
1005
1006                 /* Room path final mix buffer and panning */
1007                 for(i = 0;i < MAX_SENDS;i++)
1008                 {
1009                     outsamp = lpFilter2P(WetFilter[i], 0, value);
1010                     WetBuffer[i][j] += outsamp*WetSend[i];
1011                 }
1012
1013                 DataPosFrac += increment;
1014                 k += DataPosFrac>>FRACTIONBITS;
1015                 DataPosFrac &= FRACTIONMASK;
1016                 j++;
1017             }
1018         }
1019         else if(Channels == 2) /* Stereo */
1020         {
1021             const int chans[] = {
1022                 FRONT_LEFT, FRONT_RIGHT
1023             };
1024
1025 #define DO_MIX() do { \
1026     for(i = 0;i < MAX_SENDS;i++) \
1027         WetSend[i] += wetGainStep[i]*BufferSize; \
1028     while(BufferSize--) \
1029     { \
1030         for(i = 0;i < OUTPUTCHANNELS;i++) \
1031             DrySend[i] += dryGainStep[i]; \
1032  \
1033         for(i = 0;i < Channels;i++) \
1034         { \
1035             value = lerp(Data[k*Channels + i], Data[(k+1)*Channels + i], DataPosFrac); \
1036             value = lpFilter2P(DryFilter, chans[i]*2, value)*DrySend[chans[i]]; \
1037             for(out = 0;out < OUTPUTCHANNELS;out++) \
1038                 DryBuffer[j][out] += value*Matrix[chans[i]][out]; \
1039         } \
1040  \
1041         DataPosFrac += increment; \
1042         k += DataPosFrac>>FRACTIONBITS; \
1043         DataPosFrac &= FRACTIONMASK; \
1044         j++; \
1045     } \
1046 } while(0)
1047
1048             DO_MIX();
1049         }
1050         else if(Channels == 4) /* Quad */
1051         {
1052             const int chans[] = {
1053                 FRONT_LEFT, FRONT_RIGHT,
1054                 BACK_LEFT,  BACK_RIGHT
1055             };
1056
1057             DO_MIX();
1058         }
1059         else if(Channels == 6) /* 5.1 */
1060         {
1061             const int chans[] = {
1062                 FRONT_LEFT,   FRONT_RIGHT,
1063                 FRONT_CENTER, LFE,
1064                 BACK_LEFT,    BACK_RIGHT
1065             };
1066
1067             DO_MIX();
1068         }
1069         else if(Channels == 7) /* 6.1 */
1070         {
1071             const int chans[] = {
1072                 FRONT_LEFT,   FRONT_RIGHT,
1073                 FRONT_CENTER, LFE,
1074                 BACK_CENTER,
1075                 SIDE_LEFT,    SIDE_RIGHT
1076             };
1077
1078             DO_MIX();
1079         }
1080         else if(Channels == 8) /* 7.1 */
1081         {
1082             const int chans[] = {
1083                 FRONT_LEFT,   FRONT_RIGHT,
1084                 FRONT_CENTER, LFE,
1085                 BACK_LEFT,    BACK_RIGHT,
1086                 SIDE_LEFT,    SIDE_RIGHT
1087             };
1088
1089             DO_MIX();
1090 #undef DO_MIX
1091         }
1092         else /* Unknown? */
1093         {
1094             for(i = 0;i < OUTPUTCHANNELS;i++)
1095                 DrySend[i] += dryGainStep[i]*BufferSize;
1096             for(i = 0;i < MAX_SENDS;i++)
1097                 WetSend[i] += wetGainStep[i]*BufferSize;
1098             while(BufferSize--)
1099             {
1100                 DataPosFrac += increment;
1101                 k += DataPosFrac>>FRACTIONBITS;
1102                 DataPosFrac &= FRACTIONMASK;
1103                 j++;
1104             }
1105         }
1106         DataPosInt += k;
1107
1108     skipmix:
1109         /* Handle looping sources */
1110         if(DataPosInt >= DataSize)
1111         {
1112             if(BuffersPlayed < (ALSource->BuffersInQueue-1))
1113             {
1114                 BufferListItem = BufferListItem->next;
1115                 BuffersPlayed++;
1116                 DataPosInt -= DataSize;
1117             }
1118             else
1119             {
1120                 if(!ALSource->bLooping)
1121                 {
1122                     State = AL_STOPPED;
1123                     BufferListItem = ALSource->queue;
1124                     BuffersPlayed = ALSource->BuffersInQueue;
1125                     DataPosInt = 0;
1126                     DataPosFrac = 0;
1127                 }
1128                 else
1129                 {
1130                     BufferListItem = ALSource->queue;
1131                     BuffersPlayed = 0;
1132                     if(ALSource->BuffersInQueue == 1)
1133                         DataPosInt %= DataSize;
1134                     else
1135                         DataPosInt -= DataSize;
1136                 }
1137             }
1138         }
1139     }
1140
1141     /* Update source info */
1142     ALSource->state             = State;
1143     ALSource->BuffersPlayed     = BuffersPlayed;
1144     ALSource->position          = DataPosInt;
1145     ALSource->position_fraction = DataPosFrac;
1146     ALSource->Buffer            = BufferListItem->buffer;
1147
1148     for(i = 0;i < OUTPUTCHANNELS;i++)
1149         ALSource->DryGains[i] = DrySend[i];
1150     for(i = 0;i < MAX_SENDS;i++)
1151         ALSource->WetGains[i] = WetSend[i];
1152
1153     ALSource->FirstStart = AL_FALSE;
1154
1155     if((ALSource=ALSource->next) != NULL)
1156         goto another_source;
1157 }
1158
1159 ALvoid aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size)
1160 {
1161     float (*DryBuffer)[OUTPUTCHANNELS];
1162     ALuint SamplesToDo;
1163     ALeffectslot *ALEffectSlot;
1164     ALCcontext *ALContext;
1165     int fpuState;
1166     ALuint i, c;
1167
1168     SuspendContext(NULL);
1169
1170 #if defined(HAVE_FESETROUND)
1171     fpuState = fegetround();
1172     fesetround(FE_TOWARDZERO);
1173 #elif defined(HAVE__CONTROLFP)
1174     fpuState = _controlfp(0, 0);
1175     _controlfp(_RC_CHOP, _MCW_RC);
1176 #else
1177     (void)fpuState;
1178 #endif
1179
1180     DryBuffer = device->DryBuffer;
1181     while(size > 0)
1182     {
1183         /* Setup variables */
1184         SamplesToDo = min(size, BUFFERSIZE);
1185
1186         /* Clear mixing buffer */
1187         memset(DryBuffer, 0, SamplesToDo*OUTPUTCHANNELS*sizeof(ALfloat));
1188
1189         for(c = 0;c < device->NumContexts;c++)
1190         {
1191             ALContext = device->Contexts[c];
1192             SuspendContext(ALContext);
1193
1194             MixSomeSources(ALContext, DryBuffer, SamplesToDo);
1195
1196             /* effect slot processing */
1197             ALEffectSlot = ALContext->AuxiliaryEffectSlot;
1198             while(ALEffectSlot)
1199             {
1200                 if(ALEffectSlot->EffectState)
1201                     ALEffect_Process(ALEffectSlot->EffectState, ALEffectSlot, SamplesToDo, ALEffectSlot->WetBuffer, DryBuffer);
1202
1203                 for(i = 0;i < SamplesToDo;i++)
1204                     ALEffectSlot->WetBuffer[i] = 0.0f;
1205                 ALEffectSlot = ALEffectSlot->next;
1206             }
1207             ProcessContext(ALContext);
1208         }
1209
1210         //Post processing loop
1211         switch(device->Format)
1212         {
1213 #define CHECK_WRITE_FORMAT(bits, type, func, isWin)                           \
1214         case AL_FORMAT_MONO##bits:                                            \
1215             for(i = 0;i < SamplesToDo;i++)                                    \
1216             {                                                                 \
1217                 ((type*)buffer)[0] = (func)(DryBuffer[i][FRONT_LEFT] +        \
1218                                             DryBuffer[i][FRONT_RIGHT]);       \
1219                 buffer = ((type*)buffer) + 1;                                 \
1220             }                                                                 \
1221             break;                                                            \
1222         case AL_FORMAT_STEREO##bits:                                          \
1223             if(device->Bs2b)                                                  \
1224             {                                                                 \
1225                 for(i = 0;i < SamplesToDo;i++)                                \
1226                 {                                                             \
1227                     float samples[2];                                         \
1228                     samples[0] = DryBuffer[i][FRONT_LEFT];                    \
1229                     samples[1] = DryBuffer[i][FRONT_RIGHT];                   \
1230                     bs2b_cross_feed(device->Bs2b, samples);                   \
1231                     ((type*)buffer)[0] = (func)(samples[0]);                  \
1232                     ((type*)buffer)[1] = (func)(samples[1]);                  \
1233                     buffer = ((type*)buffer) + 2;                             \
1234                 }                                                             \
1235             }                                                                 \
1236             else                                                              \
1237             {                                                                 \
1238                 for(i = 0;i < SamplesToDo;i++)                                \
1239                 {                                                             \
1240                     ((type*)buffer)[0] = (func)(DryBuffer[i][FRONT_LEFT]);    \
1241                     ((type*)buffer)[1] = (func)(DryBuffer[i][FRONT_RIGHT]);   \
1242                     buffer = ((type*)buffer) + 2;                             \
1243                 }                                                             \
1244             }                                                                 \
1245             break;                                                            \
1246         case AL_FORMAT_QUAD##bits:                                            \
1247             for(i = 0;i < SamplesToDo;i++)                                    \
1248             {                                                                 \
1249                 ((type*)buffer)[0] = (func)(DryBuffer[i][FRONT_LEFT]);        \
1250                 ((type*)buffer)[1] = (func)(DryBuffer[i][FRONT_RIGHT]);       \
1251                 ((type*)buffer)[2] = (func)(DryBuffer[i][BACK_LEFT]);         \
1252                 ((type*)buffer)[3] = (func)(DryBuffer[i][BACK_RIGHT]);        \
1253                 buffer = ((type*)buffer) + 4;                                 \
1254             }                                                                 \
1255             break;                                                            \
1256         case AL_FORMAT_51CHN##bits:                                           \
1257             for(i = 0;i < SamplesToDo;i++)                                    \
1258             {                                                                 \
1259                 ((type*)buffer)[0] = (func)(DryBuffer[i][FRONT_LEFT]);        \
1260                 ((type*)buffer)[1] = (func)(DryBuffer[i][FRONT_RIGHT]);       \
1261                 if(isWin) {                                                   \
1262                     /* Of course, Windows can't use the same ordering... */   \
1263                     ((type*)buffer)[2] = (func)(DryBuffer[i][FRONT_CENTER]);  \
1264                     ((type*)buffer)[3] = (func)(DryBuffer[i][LFE]);           \
1265                     ((type*)buffer)[4] = (func)(DryBuffer[i][BACK_LEFT]);     \
1266                     ((type*)buffer)[5] = (func)(DryBuffer[i][BACK_RIGHT]);    \
1267                 } else {                                                      \
1268                     ((type*)buffer)[2] = (func)(DryBuffer[i][BACK_LEFT]);     \
1269                     ((type*)buffer)[3] = (func)(DryBuffer[i][BACK_RIGHT]);    \
1270                     ((type*)buffer)[4] = (func)(DryBuffer[i][FRONT_CENTER]);  \
1271                     ((type*)buffer)[5] = (func)(DryBuffer[i][LFE]);           \
1272                 }                                                             \
1273                 buffer = ((type*)buffer) + 6;                                 \
1274             }                                                                 \
1275             break;                                                            \
1276         case AL_FORMAT_61CHN##bits:                                           \
1277             for(i = 0;i < SamplesToDo;i++)                                    \
1278             {                                                                 \
1279                 ((type*)buffer)[0] = (func)(DryBuffer[i][FRONT_LEFT]);        \
1280                 ((type*)buffer)[1] = (func)(DryBuffer[i][FRONT_RIGHT]);       \
1281                 ((type*)buffer)[2] = (func)(DryBuffer[i][FRONT_CENTER]);      \
1282                 ((type*)buffer)[3] = (func)(DryBuffer[i][LFE]);               \
1283                 ((type*)buffer)[4] = (func)(DryBuffer[i][BACK_CENTER]);       \
1284                 ((type*)buffer)[5] = (func)(DryBuffer[i][SIDE_LEFT]);         \
1285                 ((type*)buffer)[6] = (func)(DryBuffer[i][SIDE_RIGHT]);        \
1286                 buffer = ((type*)buffer) + 7;                                 \
1287             }                                                                 \
1288             break;                                                            \
1289         case AL_FORMAT_71CHN##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                 if(isWin) {                                                   \
1295                     ((type*)buffer)[2] = (func)(DryBuffer[i][FRONT_CENTER]);  \
1296                     ((type*)buffer)[3] = (func)(DryBuffer[i][LFE]);           \
1297                     ((type*)buffer)[4] = (func)(DryBuffer[i][BACK_LEFT]);     \
1298                     ((type*)buffer)[5] = (func)(DryBuffer[i][BACK_RIGHT]);    \
1299                 } else {                                                      \
1300                     ((type*)buffer)[2] = (func)(DryBuffer[i][BACK_LEFT]);     \
1301                     ((type*)buffer)[3] = (func)(DryBuffer[i][BACK_RIGHT]);    \
1302                     ((type*)buffer)[4] = (func)(DryBuffer[i][FRONT_CENTER]);  \
1303                     ((type*)buffer)[5] = (func)(DryBuffer[i][LFE]);           \
1304                 }                                                             \
1305                 ((type*)buffer)[6] = (func)(DryBuffer[i][SIDE_LEFT]);         \
1306                 ((type*)buffer)[7] = (func)(DryBuffer[i][SIDE_RIGHT]);        \
1307                 buffer = ((type*)buffer) + 8;                                 \
1308             }                                                                 \
1309             break;
1310
1311 #define AL_FORMAT_MONO32 AL_FORMAT_MONO_FLOAT32
1312 #define AL_FORMAT_STEREO32 AL_FORMAT_STEREO_FLOAT32
1313 #ifdef _WIN32
1314             CHECK_WRITE_FORMAT(8,  ALubyte, aluF2UB, 1)
1315             CHECK_WRITE_FORMAT(16, ALshort, aluF2S, 1)
1316             CHECK_WRITE_FORMAT(32, ALfloat, aluF2F, 1)
1317 #else
1318             CHECK_WRITE_FORMAT(8,  ALubyte, aluF2UB, 0)
1319             CHECK_WRITE_FORMAT(16, ALshort, aluF2S, 0)
1320             CHECK_WRITE_FORMAT(32, ALfloat, aluF2F, 0)
1321 #endif
1322 #undef AL_FORMAT_STEREO32
1323 #undef AL_FORMAT_MONO32
1324 #undef CHECK_WRITE_FORMAT
1325
1326             default:
1327                 break;
1328         }
1329
1330         size -= SamplesToDo;
1331     }
1332
1333 #if defined(HAVE_FESETROUND)
1334     fesetround(fpuState);
1335 #elif defined(HAVE__CONTROLFP)
1336     _controlfp(fpuState, 0xfffff);
1337 #endif
1338
1339     ProcessContext(NULL);
1340 }
1341
1342 ALvoid aluHandleDisconnect(ALCdevice *device)
1343 {
1344     ALuint i;
1345
1346     for(i = 0;i < device->NumContexts;i++)
1347     {
1348         ALsource *source;
1349
1350         SuspendContext(device->Contexts[i]);
1351
1352         source = device->Contexts[i]->Source;
1353         while(source)
1354         {
1355             if(source->state == AL_PLAYING)
1356             {
1357                 source->state = AL_STOPPED;
1358                 source->BuffersPlayed = source->BuffersInQueue;
1359                 source->position = 0;
1360                 source->position_fraction = 0;
1361             }
1362             source = source->next;
1363         }
1364         ProcessContext(device->Contexts[i]);
1365     }
1366
1367     device->Connected = ALC_FALSE;
1368 }