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) Value /= 32768.f;
  65     else            Value /= 32767.f;
  66     return Value;
  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, flMaxVelocity;
 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. Translate Listener to origin (convert to head relative)
 467         // Note that Direction and SourceToListener are *not* transformed.
 468         // SourceToListener is used with the source and listener velocities,
 469         // which are untransformed, and Direction is used with SourceToListener
 470         // for the sound cone
 471         if(ALSource->bHeadRelative==AL_FALSE)
 472         {
 473             // Build transform matrix
 474             aluCrossproduct(ALContext->Listener.Forward, ALContext->Listener.Up, U); // Right-vector
 475             aluNormalize(U);  // Normalized Right-vector
 476             memcpy(V, ALContext->Listener.Up, sizeof(V));   // Up-vector
 477             aluNormalize(V);  // Normalized Up-vector
 478             memcpy(N, ALContext->Listener.Forward, sizeof(N));  // At-vector
 479             aluNormalize(N);  // Normalized At-vector
 480             Matrix[0][0] = U[0]; Matrix[0][1] = V[0]; Matrix[0][2] = -N[0];
 481             Matrix[1][0] = U[1]; Matrix[1][1] = V[1]; Matrix[1][2] = -N[1];
 482             Matrix[2][0] = U[2]; Matrix[2][1] = V[2]; Matrix[2][2] = -N[2];
 483
 484             // Translate source position into listener space
 485             Position[0] -= ALContext->Listener.Position[0];
 486             Position[1] -= ALContext->Listener.Position[1];
 487             Position[2] -= ALContext->Listener.Position[2];
 488
 489             SourceToListener[0] = -Position[0];
 490             SourceToListener[1] = -Position[1];
 491             SourceToListener[2] = -Position[2];
 492
 493             // Transform source position into listener space
 494             aluMatrixVector(Position, Matrix);
 495         }
 496         else
 497         {
 498             SourceToListener[0] = -Position[0];
 499             SourceToListener[1] = -Position[1];
 500             SourceToListener[2] = -Position[2];
 501         }
 502         aluNormalize(SourceToListener);
 503         aluNormalize(Direction);
 504
 505         //2. Calculate distance attenuation
 506         Distance = aluSqrt(aluDotproduct(Position, Position));
 507
 508         flAttenuation = 1.0f;
 509         for(i = 0;i < MAX_SENDS;i++)
 510         {
 511             RoomAttenuation[i] = 1.0f;
 512
 513             RoomRolloff[i] = ALSource->RoomRolloffFactor;
 514             if(ALSource->Send[i].Slot &&
 515                ALSource->Send[i].Slot->effect.type == AL_EFFECT_REVERB)
 516                 RoomRolloff[i] += ALSource->Send[i].Slot->effect.Reverb.RoomRolloffFactor;
 517         }
 518
 519         switch (ALSource->DistanceModel)
 520         {
 521             case AL_INVERSE_DISTANCE_CLAMPED:
 522                 Distance=__max(Distance,MinDist);
 523                 Distance=__min(Distance,MaxDist);
 524                 if (MaxDist < MinDist)
 525                     break;
 526                 //fall-through
 527             case AL_INVERSE_DISTANCE:
 528                 if (MinDist > 0.0f)
 529                 {
 530                     if ((MinDist + (Rolloff * (Distance - MinDist))) > 0.0f)
 531                         flAttenuation = MinDist / (MinDist + (Rolloff * (Distance - MinDist)));
 532                     for(i = 0;i < NumSends;i++)
 533                     {
 534                         if ((MinDist + (RoomRolloff[i] * (Distance - MinDist))) > 0.0f)
 535                             RoomAttenuation[i] = MinDist / (MinDist + (RoomRolloff[i] * (Distance - MinDist)));
 536                     }
 537                 }
 538                 break;
 539
 540             case AL_LINEAR_DISTANCE_CLAMPED:
 541                 Distance=__max(Distance,MinDist);
 542                 Distance=__min(Distance,MaxDist);
 543                 if (MaxDist < MinDist)
 544                     break;
 545                 //fall-through
 546             case AL_LINEAR_DISTANCE:
 547                 Distance=__min(Distance,MaxDist);
 548                 if (MaxDist != MinDist)
 549                 {
 550                     flAttenuation = 1.0f - (Rolloff*(Distance-MinDist)/(MaxDist - MinDist));
 551                     for(i = 0;i < NumSends;i++)
 552                         RoomAttenuation[i] = 1.0f - (RoomRolloff[i]*(Distance-MinDist)/(MaxDist - MinDist));
 553                 }
 554                 break;
 555
 556             case AL_EXPONENT_DISTANCE_CLAMPED:
 557                 Distance=__max(Distance,MinDist);
 558                 Distance=__min(Distance,MaxDist);
 559                 if (MaxDist < MinDist)
 560                     break;
 561                 //fall-through
 562             case AL_EXPONENT_DISTANCE:
 563                 if ((Distance > 0.0f) && (MinDist > 0.0f))
 564                 {
 565                     flAttenuation = (ALfloat)pow(Distance/MinDist, -Rolloff);
 566                     for(i = 0;i < NumSends;i++)
 567                         RoomAttenuation[i] = (ALfloat)pow(Distance/MinDist, -RoomRolloff[i]);
 568                 }
 569                 break;
 570
 571             case AL_NONE:
 572                 break;
 573         }
 574
 575         // Source Gain + Attenuation and clamp to Min/Max Gain
 576         DryMix = SourceVolume * flAttenuation;
 577         DryMix = __min(DryMix,MaxVolume);
 578         DryMix = __max(DryMix,MinVolume);
 579
 580         for(i = 0;i < NumSends;i++)
 581         {
 582             ALfloat WetMix = SourceVolume * RoomAttenuation[i];
 583             WetMix = __min(WetMix,MaxVolume);
 584             wetsend[i] = __max(WetMix,MinVolume);
 585             wetgainhf[i] = 1.0f;
 586         }
 587
 588         // Distance-based air absorption
 589         if(ALSource->AirAbsorptionFactor > 0.0f && ALSource->DistanceModel != AL_NONE)
 590         {
 591             ALfloat dist = Distance-MinDist;
 592             ALfloat absorb;
 593
 594             if(dist < 0.0f) dist = 0.0f;
 595             // Absorption calculation is done in dB
 596             absorb = (ALSource->AirAbsorptionFactor*AIRABSORBGAINDBHF) *
 597                      (dist*MetersPerUnit);
 598             // Convert dB to linear gain before applying
 599             absorb = pow(10.0, absorb/20.0);
 600             DryGainHF *= absorb;
 601             for(i = 0;i < MAX_SENDS;i++)
 602                 wetgainhf[i] *= absorb;
 603         }
 604
 605         //3. Apply directional soundcones
 606         Angle = aluAcos(aluDotproduct(Direction,SourceToListener)) * 180.0f/M_PI;
 607         if(Angle >= InnerAngle && Angle <= OuterAngle)
 608         {
 609             ALfloat scale = (Angle-InnerAngle) / (OuterAngle-InnerAngle);
 610             ConeVolume = (1.0f+(ALSource->flOuterGain-1.0f)*scale);
 611             ConeHF = (1.0f+(OuterGainHF-1.0f)*scale);
 612             DryMix *= ConeVolume;
 613             if(ALSource->DryGainHFAuto)
 614                 DryGainHF *= ConeHF;
 615         }
 616         else if(Angle > OuterAngle)
 617         {
 618             ConeVolume = (1.0f+(ALSource->flOuterGain-1.0f));
 619             ConeHF = (1.0f+(OuterGainHF-1.0f));
 620             DryMix *= ConeVolume;
 621             if(ALSource->DryGainHFAuto)
 622                 DryGainHF *= ConeHF;
 623         }
 624         else
 625         {
 626             ConeVolume = 1.0f;
 627             ConeHF = 1.0f;
 628         }
 629
 630         //4. Calculate Velocity
 631         if(DopplerFactor != 0.0f)
 632         {
 633             ALfloat flVSS, flVLS = 0.0f;
 634
 635             if(ALSource->bHeadRelative==AL_FALSE)
 636                 flVLS = aluDotproduct(ALContext->Listener.Velocity, SourceToListener);
 637             flVSS = aluDotproduct(ALSource->vVelocity, SourceToListener);
 638
 639             flMaxVelocity = (DopplerVelocity * flSpeedOfSound) / DopplerFactor;
 640
 641             if (flVSS >= flMaxVelocity)
 642                 flVSS = (flMaxVelocity - 1.0f);
 643             else if (flVSS <= -flMaxVelocity)
 644                 flVSS = -flMaxVelocity + 1.0f;
 645
 646             if (flVLS >= flMaxVelocity)
 647                 flVLS = (flMaxVelocity - 1.0f);
 648             else if (flVLS <= -flMaxVelocity)
 649                 flVLS = -flMaxVelocity + 1.0f;
 650
 651             pitch[0] = ALSource->flPitch *
 652                        ((flSpeedOfSound * DopplerVelocity) - (DopplerFactor * flVLS)) /
 653                        ((flSpeedOfSound * DopplerVelocity) - (DopplerFactor * flVSS));
 654         }
 655         else
 656             pitch[0] = ALSource->flPitch;
 657
 658         for(i = 0;i < NumSends;i++)
 659         {
 660             if(ALSource->Send[i].Slot &&
 661                ALSource->Send[i].Slot->effect.type != AL_EFFECT_NULL)
 662             {
 663                 if(ALSource->WetGainAuto)
 664                     wetsend[i] *= ConeVolume;
 665                 if(ALSource->WetGainHFAuto)
 666                     wetgainhf[i] *= ConeHF;
 667
 668                 if(ALSource->Send[i].Slot->AuxSendAuto)
 669                 {
 670                     // Apply minimal attenuation in place of missing
 671                     // statistical reverb model.
 672                     wetsend[i] *= pow(DryMix, 1.0f / 2.0f);
 673                 }
 674                 else
 675                 {
 676                     // If the slot's auxilliary send auto is off, the data sent to the
 677                     // effect slot is the same as the dry path, sans filter effects
 678                     wetsend[i] = DryMix;
 679                     wetgainhf[i] = DryGainHF;
 680                 }
 681
 682                 switch(ALSource->Send[i].WetFilter.type)
 683                 {
 684                     case AL_FILTER_LOWPASS:
 685                         wetsend[i] *= ALSource->Send[i].WetFilter.Gain;
 686                         wetgainhf[i] *= ALSource->Send[i].WetFilter.GainHF;
 687                         break;
 688                 }
 689                 wetsend[i] *= ListenerGain;
 690             }
 691             else
 692             {
 693                 wetsend[i] = 0.0f;
 694                 wetgainhf[i] = 1.0f;
 695             }
 696         }
 697         for(i = NumSends;i < MAX_SENDS;i++)
 698         {
 699             wetsend[i] = 0.0f;
 700             wetgainhf[i] = 1.0f;
 701         }
 702
 703         //5. Apply filter gains and filters
 704         switch(ALSource->DirectFilter.type)
 705         {
 706             case AL_FILTER_LOWPASS:
 707                 DryMix *= ALSource->DirectFilter.Gain;
 708                 DryGainHF *= ALSource->DirectFilter.GainHF;
 709                 break;
 710         }
 711         DryMix *= ListenerGain;
 712
 713         // Use energy-preserving panning algorithm for multi-speaker playback
 714         length = aluSqrt(Position[0]*Position[0] + Position[1]*Position[1] +
 715                          Position[2]*Position[2]);
 716         length = __max(length, MinDist);
 717         if(length > 0.0f)
 718         {
 719             ALfloat invlen = 1.0f/length;
 720             Position[0] *= invlen;
 721             Position[1] *= invlen;
 722             Position[2] *= invlen;
 723         }
 724
 725         pos = aluCart2LUTpos(-Position[2], Position[0]);
 726         SpeakerGain = &ALContext->PanningLUT[OUTPUTCHANNELS * pos];
 727
 728         DirGain = aluSqrt(Position[0]*Position[0] + Position[2]*Position[2]);
 729         // elevation adjustment for directional gain. this sucks, but
 730         // has low complexity
 731         AmbientGain = 1.0/aluSqrt(ALContext->NumChan) * (1.0-DirGain);
 732         for(s = 0; s < OUTPUTCHANNELS; s++)
 733         {
 734             ALfloat gain = SpeakerGain[s]*DirGain + AmbientGain;
 735             drysend[s] = DryMix * gain;
 736         }
 737         *drygainhf = DryGainHF;
 738     }
 739     else
 740     {
 741         //1. Multi-channel buffers always play "normal"
 742         pitch[0] = ALSource->flPitch;
 743
 744         DryMix = SourceVolume;
 745         DryMix = __min(DryMix,MaxVolume);
 746         DryMix = __max(DryMix,MinVolume);
 747
 748         switch(ALSource->DirectFilter.type)
 749         {
 750             case AL_FILTER_LOWPASS:
 751                 DryMix *= ALSource->DirectFilter.Gain;
 752                 DryGainHF *= ALSource->DirectFilter.GainHF;
 753                 break;
 754         }
 755
 756         drysend[FRONT_LEFT]   = DryMix * ListenerGain;
 757         drysend[FRONT_RIGHT]  = DryMix * ListenerGain;
 758         drysend[SIDE_LEFT]    = DryMix * ListenerGain;
 759         drysend[SIDE_RIGHT]   = DryMix * ListenerGain;
 760         drysend[BACK_LEFT]    = DryMix * ListenerGain;
 761         drysend[BACK_RIGHT]   = DryMix * ListenerGain;
 762         drysend[FRONT_CENTER] = DryMix * ListenerGain;
 763         drysend[BACK_CENTER]  = DryMix * ListenerGain;
 764         drysend[LFE]          = DryMix * ListenerGain;
 765         *drygainhf            = DryGainHF;
 766
 767         for(i = 0;i < MAX_SENDS;i++)
 768         {
 769             wetsend[i] = 0.0f;
 770             wetgainhf[i] = 1.0f;
 771         }
 772     }
 773 }
 774
 775 static __inline ALshort lerp(ALshort val1, ALshort val2, ALint frac)
 776 {
 777     return val1 + (((val2-val1)*frac)>>FRACTIONBITS);
 778 }
 779
 780 static void MixSomeSources(ALCcontext *ALContext, float (*DryBuffer)[OUTPUTCHANNELS], ALuint SamplesToDo)
 781 {
 782     static float DummyBuffer[BUFFERSIZE];
 783     ALfloat *WetBuffer[MAX_SENDS];
 784     ALfloat (*Matrix)[OUTPUTCHANNELS] = ALContext->ChannelMatrix;
 785     ALfloat DrySend[OUTPUTCHANNELS] = { 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f };
 786     ALfloat dryGainStep[OUTPUTCHANNELS];
 787     ALfloat wetGainStep[MAX_SENDS];
 788     ALfloat values[OUTPUTCHANNELS];
 789     ALuint i, j, k, out;
 790     ALsource *ALSource;
 791     ALfloat value;
 792     ALshort *Data;
 793     ALbufferlistitem *BufferListItem;
 794     ALint64 DataSize64,DataPos64;
 795     FILTER *DryFilter, *WetFilter[MAX_SENDS];
 796     ALfloat WetSend[MAX_SENDS];
 797     ALfloat DryGainHF = 0.0f;
 798     ALfloat WetGainHF[MAX_SENDS];
 799     ALuint rampLength;
 800     ALint Looping,State;
 801     ALint increment;
 802
 803     if(!(ALSource=ALContext->Source))
 804         return;
 805
 806     rampLength = ALContext->Frequency * MIN_RAMP_LENGTH / 1000;
 807     rampLength = max(rampLength, SamplesToDo);
 808
 809 another_source:
 810     j = 0;
 811     State = ALSource->state;
 812     while(State == AL_PLAYING && j < SamplesToDo)
 813     {
 814         ALuint DataSize = 0;
 815         ALuint DataPosInt = 0;
 816         ALuint DataPosFrac = 0;
 817         ALuint Buffer;
 818         ALbuffer *ALBuffer;
 819         ALuint Channels, Frequency;
 820         ALuint BufferSize;
 821         ALfloat Pitch;
 822
 823         /* Get buffer info */
 824         if(!(Buffer = ALSource->ulBufferID))
 825             goto skipmix;
 826         ALBuffer = (ALbuffer*)ALTHUNK_LOOKUPENTRY(Buffer);
 827
 828         Data      = ALBuffer->data;
 829         Channels  = aluChannelsFromFormat(ALBuffer->format);
 830         DataSize  = ALBuffer->size;
 831         DataSize /= Channels * aluBytesFromFormat(ALBuffer->format);
 832         Frequency = ALBuffer->frequency;
 833
 834         DataPosInt = ALSource->position;
 835         DataPosFrac = ALSource->position_fraction;
 836
 837         if(DataPosInt >= DataSize)
 838             goto skipmix;
 839
 840         /* Get source info */
 841         DryFilter = &ALSource->iirFilter;
 842         for(i = 0;i < MAX_SENDS;i++)
 843         {
 844             WetFilter[i] = &ALSource->Send[i].iirFilter;
 845             WetBuffer[i] = (ALSource->Send[i].Slot ?
 846                             ALSource->Send[i].Slot->WetBuffer :
 847                             DummyBuffer);
 848         }
 849
 850         CalcSourceParams(ALContext, ALSource, (Channels==1)?AL_TRUE:AL_FALSE,
 851                          DrySend, WetSend, &Pitch, &DryGainHF, WetGainHF);
 852         Pitch = (Pitch*Frequency) / ALContext->Frequency;
 853
 854         if(Channels == 1)
 855         {
 856             ALfloat cw, a, g;
 857
 858             /* Update filter coefficients. Calculations based on the I3DL2
 859              * spec. */
 860             cw = cos(2.0*M_PI * LOWPASSFREQCUTOFF / ALContext->Frequency);
 861             /* We use four chained one-pole filters, so we need to take the
 862              * fourth root of the squared gain, which is the same as the square
 863              * root of the base gain. */
 864             /* Be careful with gains < 0.0001, as that causes the coefficient
 865              * head towards 1, which will flatten the signal */
 866             g = aluSqrt(__max(DryGainHF, 0.0001f));
 867             a = 0.0f;
 868             if(g < 0.9999f) /* 1-epsilon */
 869                 a = (1 - g*cw - aluSqrt(2*g*(1-cw) - g*g*(1 - cw*cw))) /
 870                     (1 - g);
 871             DryFilter->coeff = a;
 872
 873             for(i = 0;i < MAX_SENDS;i++)
 874             {
 875                 /* The wet path uses two chained one-pole filters, so take the
 876                  * base gain (square root of the squared gain) */
 877                 g = __max(WetGainHF[i], 0.01f);
 878                 a = 0.0f;
 879                 if(g < 0.9999f) /* 1-epsilon */
 880                     a = (1 - g*cw - aluSqrt(2*g*(1-cw) - g*g*(1 - cw*cw))) /
 881                         (1 - g);
 882                 WetFilter[i]->coeff = a;
 883             }
 884         }
 885         else
 886         {
 887             ALfloat cw, a, g;
 888
 889             /* Multi-channel sources use two chained one-pole filters */
 890             cw = cos(2.0*M_PI * LOWPASSFREQCUTOFF / ALContext->Frequency);
 891             g = __max(DryGainHF, 0.01f);
 892             a = 0.0f;
 893             if(g < 0.9999f) /* 1-epsilon */
 894                 a = (1 - g*cw - aluSqrt(2*g*(1-cw) - g*g*(1 - cw*cw))) /
 895                     (1 - g);
 896             DryFilter->coeff = a;
 897             for(i = 0;i < MAX_SENDS;i++)
 898                 WetFilter[i]->coeff = 0.0f;
 899
 900             if(DuplicateStereo && Channels == 2)
 901             {
 902                 Matrix[FRONT_LEFT][SIDE_LEFT]   = 1.0f;
 903                 Matrix[FRONT_RIGHT][SIDE_RIGHT] = 1.0f;
 904                 Matrix[FRONT_LEFT][BACK_LEFT]   = 1.0f;
 905                 Matrix[FRONT_RIGHT][BACK_RIGHT] = 1.0f;
 906             }
 907             else if(DuplicateStereo)
 908             {
 909                 Matrix[FRONT_LEFT][SIDE_LEFT]   = 0.0f;
 910                 Matrix[FRONT_RIGHT][SIDE_RIGHT] = 0.0f;
 911                 Matrix[FRONT_LEFT][BACK_LEFT]   = 0.0f;
 912                 Matrix[FRONT_RIGHT][BACK_RIGHT] = 0.0f;
 913             }
 914         }
 915
 916         /* Compute the gain steps for each output channel */
 917         if(ALSource->FirstStart && DataPosInt == 0 && DataPosFrac == 0)
 918         {
 919             for(i = 0;i < OUTPUTCHANNELS;i++)
 920                 dryGainStep[i] = 0.0f;
 921             for(i = 0;i < MAX_SENDS;i++)
 922                 wetGainStep[i] = 0.0f;
 923         }
 924         else
 925         {
 926             for(i = 0;i < OUTPUTCHANNELS;i++)
 927             {
 928                 dryGainStep[i] = (DrySend[i]-ALSource->DryGains[i]) / rampLength;
 929                 DrySend[i] = ALSource->DryGains[i];
 930             }
 931             for(i = 0;i < MAX_SENDS;i++)
 932             {
 933                 wetGainStep[i] = (WetSend[i]-ALSource->WetGains[i]) / rampLength;
 934                 WetSend[i] = ALSource->WetGains[i];
 935             }
 936         }
 937         ALSource->FirstStart = AL_FALSE;
 938
 939         /* Compute 18.14 fixed point step */
 940         if(Pitch > (float)MAX_PITCH)
 941             Pitch = (float)MAX_PITCH;
 942         increment = (ALint)(Pitch*(ALfloat)(1L<<FRACTIONBITS));
 943         if(increment <= 0)
 944             increment = (1<<FRACTIONBITS);
 945
 946         /* Figure out how many samples we can mix. */
 947         DataSize64 = DataSize;
 948         DataSize64 <<= FRACTIONBITS;
 949         DataPos64 = DataPosInt;
 950         DataPos64 <<= FRACTIONBITS;
 951         DataPos64 += DataPosFrac;
 952         BufferSize = (ALuint)((DataSize64-DataPos64+(increment-1)) / increment);
 953
 954         BufferListItem = ALSource->queue;
 955         for(i = 0;i < ALSource->BuffersPlayed && BufferListItem;i++)
 956             BufferListItem = BufferListItem->next;
 957         if(BufferListItem)
 958         {
 959             ALbuffer *NextBuf;
 960             ALuint ulExtraSamples;
 961
 962             if(BufferListItem->next)
 963             {
 964                 NextBuf = (ALbuffer*)ALTHUNK_LOOKUPENTRY(BufferListItem->next->buffer);
 965                 if(NextBuf && NextBuf->data)
 966                 {
 967                     ulExtraSamples = min(NextBuf->size, (ALint)(ALBuffer->padding*Channels*2));
 968                     memcpy(&Data[DataSize*Channels], NextBuf->data, ulExtraSamples);
 969                 }
 970             }
 971             else if(ALSource->bLooping)
 972             {
 973                 NextBuf = (ALbuffer*)ALTHUNK_LOOKUPENTRY(ALSource->queue->buffer);
 974                 if(NextBuf && NextBuf->data)
 975                 {
 976                     ulExtraSamples = min(NextBuf->size, (ALint)(ALBuffer->padding*Channels*2));
 977                     memcpy(&Data[DataSize*Channels], NextBuf->data, ulExtraSamples);
 978                 }
 979             }
 980             else
 981                 memset(&Data[DataSize*Channels], 0, (ALBuffer->padding*Channels*2));
 982         }
 983         BufferSize = min(BufferSize, (SamplesToDo-j));
 984
 985         /* Actual sample mixing loop */
 986         k = 0;
 987         Data += DataPosInt*Channels;
 988
 989         if(Channels == 1) /* Mono */
 990         {
 991             ALfloat outsamp;
 992
 993             while(BufferSize--)
 994             {
 995                 for(i = 0;i < OUTPUTCHANNELS;i++)
 996                     DrySend[i] += dryGainStep[i];
 997                 for(i = 0;i < MAX_SENDS;i++)
 998                     WetSend[i] += wetGainStep[i];
 999
1000                 /* First order interpolator */
1001                 value = lerp(Data[k], Data[k+1], DataPosFrac);
1002
1003                 /* Direct path final mix buffer and panning */
1004                 outsamp = lpFilter4P(DryFilter, 0, value);
1005                 DryBuffer[j][FRONT_LEFT]   += outsamp*DrySend[FRONT_LEFT];
1006                 DryBuffer[j][FRONT_RIGHT]  += outsamp*DrySend[FRONT_RIGHT];
1007                 DryBuffer[j][SIDE_LEFT]    += outsamp*DrySend[SIDE_LEFT];
1008                 DryBuffer[j][SIDE_RIGHT]   += outsamp*DrySend[SIDE_RIGHT];
1009                 DryBuffer[j][BACK_LEFT]    += outsamp*DrySend[BACK_LEFT];
1010                 DryBuffer[j][BACK_RIGHT]   += outsamp*DrySend[BACK_RIGHT];
1011                 DryBuffer[j][FRONT_CENTER] += outsamp*DrySend[FRONT_CENTER];
1012                 DryBuffer[j][BACK_CENTER]  += outsamp*DrySend[BACK_CENTER];
1013
1014                 /* Room path final mix buffer and panning */
1015                 for(i = 0;i < MAX_SENDS;i++)
1016                 {
1017                     outsamp = lpFilter2P(WetFilter[i], 0, value);
1018                     WetBuffer[i][j] += outsamp*WetSend[i];
1019                 }
1020
1021                 DataPosFrac += increment;
1022                 k += DataPosFrac>>FRACTIONBITS;
1023                 DataPosFrac &= FRACTIONMASK;
1024                 j++;
1025             }
1026         }
1027         else if(Channels == 2) /* Stereo */
1028         {
1029             const int chans[] = {
1030                 FRONT_LEFT, FRONT_RIGHT
1031             };
1032
1033 #define DO_MIX() do { \
1034     for(i = 0;i < MAX_SENDS;i++) \
1035         WetSend[i] += wetGainStep[i]*BufferSize; \
1036     while(BufferSize--) \
1037     { \
1038         for(i = 0;i < OUTPUTCHANNELS;i++) \
1039             DrySend[i] += dryGainStep[i]; \
1040  \
1041         for(i = 0;i < Channels;i++) \
1042         { \
1043             value = lerp(Data[k*Channels + i], Data[(k+1)*Channels + i], DataPosFrac); \
1044             values[i] = lpFilter2P(DryFilter, chans[i]*2, value)*DrySend[chans[i]]; \
1045         } \
1046         for(out = 0;out < OUTPUTCHANNELS;out++) \
1047         { \
1048             ALfloat sum = 0.0f; \
1049             for(i = 0;i < Channels;i++) \
1050                 sum += values[i]*Matrix[chans[i]][out]; \
1051             DryBuffer[j][out] += sum; \
1052         } \
1053  \
1054         DataPosFrac += increment; \
1055         k += DataPosFrac>>FRACTIONBITS; \
1056         DataPosFrac &= FRACTIONMASK; \
1057         j++; \
1058     } \
1059 } while(0)
1060
1061             DO_MIX();
1062         }
1063         else if(Channels == 4) /* Quad */
1064         {
1065             const int chans[] = {
1066                 FRONT_LEFT, FRONT_RIGHT,
1067                 BACK_LEFT,  BACK_RIGHT
1068             };
1069
1070             DO_MIX();
1071         }
1072         else if(Channels == 6) /* 5.1 */
1073         {
1074             const int chans[] = {
1075                 FRONT_LEFT,   FRONT_RIGHT,
1076                 FRONT_CENTER, LFE,
1077                 BACK_LEFT,    BACK_RIGHT
1078             };
1079
1080             DO_MIX();
1081         }
1082         else if(Channels == 7) /* 6.1 */
1083         {
1084             const int chans[] = {
1085                 FRONT_LEFT,   FRONT_RIGHT,
1086                 FRONT_CENTER, LFE,
1087                 BACK_CENTER,
1088                 SIDE_LEFT,    SIDE_RIGHT
1089             };
1090
1091             DO_MIX();
1092         }
1093         else if(Channels == 8) /* 7.1 */
1094         {
1095             const int chans[] = {
1096                 FRONT_LEFT,   FRONT_RIGHT,
1097                 FRONT_CENTER, LFE,
1098                 BACK_LEFT,    BACK_RIGHT,
1099                 SIDE_LEFT,    SIDE_RIGHT
1100             };
1101
1102             DO_MIX();
1103 #undef DO_MIX
1104         }
1105         else /* Unknown? */
1106         {
1107             for(i = 0;i < OUTPUTCHANNELS;i++)
1108                 DrySend[i] += dryGainStep[i]*BufferSize;
1109             for(i = 0;i < MAX_SENDS;i++)
1110                 WetSend[i] += wetGainStep[i]*BufferSize;
1111             while(BufferSize--)
1112             {
1113                 DataPosFrac += increment;
1114                 k += DataPosFrac>>FRACTIONBITS;
1115                 DataPosFrac &= FRACTIONMASK;
1116                 j++;
1117             }
1118         }
1119         DataPosInt += k;
1120
1121         /* Update source info */
1122         ALSource->position = DataPosInt;
1123         ALSource->position_fraction = DataPosFrac;
1124         for(i = 0;i < OUTPUTCHANNELS;i++)
1125             ALSource->DryGains[i] = DrySend[i];
1126         for(i = 0;i < MAX_SENDS;i++)
1127             ALSource->WetGains[i] = WetSend[i];
1128
1129     skipmix:
1130         /* Handle looping sources */
1131         if(!Buffer || DataPosInt >= DataSize)
1132         {
1133             /* Queueing */
1134             if(ALSource->queue)
1135             {
1136                 Looping = ALSource->bLooping;
1137                 if(ALSource->BuffersPlayed < (ALSource->BuffersInQueue-1))
1138                 {
1139                     BufferListItem = ALSource->queue;
1140                     for(i = 0;i <= ALSource->BuffersPlayed && BufferListItem;i++)
1141                     {
1142                         if(!Looping)
1143                             BufferListItem->bufferstate = PROCESSED;
1144                         BufferListItem = BufferListItem->next;
1145                     }
1146                     if(BufferListItem)
1147                         ALSource->ulBufferID = BufferListItem->buffer;
1148                     ALSource->position = DataPosInt-DataSize;
1149                     ALSource->position_fraction = DataPosFrac;
1150                     ALSource->BuffersPlayed++;
1151                 }
1152                 else
1153                 {
1154                     if(!Looping)
1155                     {
1156                         /* alSourceStop */
1157                         ALSource->state = AL_STOPPED;
1158                         ALSource->inuse = AL_FALSE;
1159                         ALSource->BuffersPlayed = ALSource->BuffersInQueue;
1160                         BufferListItem = ALSource->queue;
1161                         while(BufferListItem != NULL)
1162                         {
1163                             BufferListItem->bufferstate = PROCESSED;
1164                             BufferListItem = BufferListItem->next;
1165                         }
1166                         ALSource->position = 0;
1167                         ALSource->position_fraction = 0;
1168                     }
1169                     else
1170                     {
1171                         /* alSourceRewind */
1172                         /* alSourcePlay */
1173                         ALSource->state = AL_PLAYING;
1174                         ALSource->inuse = AL_TRUE;
1175                         ALSource->play = AL_TRUE;
1176                         ALSource->BuffersPlayed = 0;
1177                         BufferListItem = ALSource->queue;
1178                         while(BufferListItem != NULL)
1179                         {
1180                             BufferListItem->bufferstate = PENDING;
1181                             BufferListItem = BufferListItem->next;
1182                         }
1183                         ALSource->ulBufferID = ALSource->queue->buffer;
1184
1185                         if(ALSource->BuffersInQueue == 1)
1186                             ALSource->position = DataPosInt%DataSize;
1187                         else
1188                             ALSource->position = DataPosInt-DataSize;
1189                         ALSource->position_fraction = DataPosFrac;
1190                     }
1191                 }
1192             }
1193         }
1194
1195         /* Get source state */
1196         State = ALSource->state;
1197     }
1198
1199     if((ALSource=ALSource->next) != NULL)
1200         goto another_source;
1201 }
1202
1203 ALvoid aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size)
1204 {
1205     static float DryBuffer[BUFFERSIZE][OUTPUTCHANNELS];
1206     ALuint SamplesToDo;
1207     ALeffectslot *ALEffectSlot;
1208     ALCcontext *ALContext;
1209     int fpuState;
1210     ALuint i;
1211
1212     SuspendContext(NULL);
1213
1214 #if defined(HAVE_FESETROUND)
1215     fpuState = fegetround();
1216     fesetround(FE_TOWARDZERO);
1217 #elif defined(HAVE__CONTROLFP)
1218     fpuState = _controlfp(0, 0);
1219     _controlfp(_RC_CHOP, _MCW_RC);
1220 #else
1221     (void)fpuState;
1222 #endif
1223
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         ALContext = device->Context;
1233         if(ALContext)
1234         {
1235             MixSomeSources(ALContext, DryBuffer, SamplesToDo);
1236
1237             /* effect slot processing */
1238             ALEffectSlot = ALContext->AuxiliaryEffectSlot;
1239             while(ALEffectSlot)
1240             {
1241                 if(ALEffectSlot->EffectState)
1242                     ALEffect_Process(ALEffectSlot->EffectState, ALEffectSlot, SamplesToDo, ALEffectSlot->WetBuffer, DryBuffer);
1243
1244                 for(i = 0;i < SamplesToDo;i++)
1245                     ALEffectSlot->WetBuffer[i] = 0.0f;
1246                 ALEffectSlot = ALEffectSlot->next;
1247             }
1248         }
1249
1250         //Post processing loop
1251         switch(device->Format)
1252         {
1253 #define CHECK_WRITE_FORMAT(bits, type, func, isWin)                           \
1254         case AL_FORMAT_MONO##bits:                                            \
1255             for(i = 0;i < SamplesToDo;i++)                                    \
1256             {                                                                 \
1257                 ((type*)buffer)[0] = (func)(DryBuffer[i][FRONT_LEFT] +        \
1258                                             DryBuffer[i][FRONT_RIGHT]);       \
1259                 buffer = ((type*)buffer) + 1;                                 \
1260             }                                                                 \
1261             break;                                                            \
1262         case AL_FORMAT_STEREO##bits:                                          \
1263             if(device->Bs2b)                                                  \
1264             {                                                                 \
1265                 for(i = 0;i < SamplesToDo;i++)                                \
1266                 {                                                             \
1267                     float samples[2];                                         \
1268                     samples[0] = DryBuffer[i][FRONT_LEFT];                    \
1269                     samples[1] = DryBuffer[i][FRONT_RIGHT];                   \
1270                     bs2b_cross_feed(device->Bs2b, samples);                   \
1271                     ((type*)buffer)[0] = (func)(samples[0]);                  \
1272                     ((type*)buffer)[1] = (func)(samples[1]);                  \
1273                     buffer = ((type*)buffer) + 2;                             \
1274                 }                                                             \
1275             }                                                                 \
1276             else                                                              \
1277             {                                                                 \
1278                 for(i = 0;i < SamplesToDo;i++)                                \
1279                 {                                                             \
1280                     ((type*)buffer)[0] = (func)(DryBuffer[i][FRONT_LEFT]);    \
1281                     ((type*)buffer)[1] = (func)(DryBuffer[i][FRONT_RIGHT]);   \
1282                     buffer = ((type*)buffer) + 2;                             \
1283                 }                                                             \
1284             }                                                                 \
1285             break;                                                            \
1286         case AL_FORMAT_QUAD##bits:                                            \
1287             for(i = 0;i < SamplesToDo;i++)                                    \
1288             {                                                                 \
1289                 ((type*)buffer)[0] = (func)(DryBuffer[i][FRONT_LEFT]);        \
1290                 ((type*)buffer)[1] = (func)(DryBuffer[i][FRONT_RIGHT]);       \
1291                 ((type*)buffer)[2] = (func)(DryBuffer[i][BACK_LEFT]);         \
1292                 ((type*)buffer)[3] = (func)(DryBuffer[i][BACK_RIGHT]);        \
1293                 buffer = ((type*)buffer) + 4;                                 \
1294             }                                                                 \
1295             break;                                                            \
1296         case AL_FORMAT_51CHN##bits:                                           \
1297             for(i = 0;i < SamplesToDo;i++)                                    \
1298             {                                                                 \
1299                 ((type*)buffer)[0] = (func)(DryBuffer[i][FRONT_LEFT]);        \
1300                 ((type*)buffer)[1] = (func)(DryBuffer[i][FRONT_RIGHT]);       \
1301                 if(isWin) {                                                   \
1302                     /* Of course, Windows can't use the same ordering... */   \
1303                     ((type*)buffer)[2] = (func)(DryBuffer[i][FRONT_CENTER]);  \
1304                     ((type*)buffer)[3] = (func)(DryBuffer[i][LFE]);           \
1305                     ((type*)buffer)[4] = (func)(DryBuffer[i][BACK_LEFT]);     \
1306                     ((type*)buffer)[5] = (func)(DryBuffer[i][BACK_RIGHT]);    \
1307                 } else {                                                      \
1308                     ((type*)buffer)[2] = (func)(DryBuffer[i][BACK_LEFT]);     \
1309                     ((type*)buffer)[3] = (func)(DryBuffer[i][BACK_RIGHT]);    \
1310                     ((type*)buffer)[4] = (func)(DryBuffer[i][FRONT_CENTER]);  \
1311                     ((type*)buffer)[5] = (func)(DryBuffer[i][LFE]);           \
1312                 }                                                             \
1313                 buffer = ((type*)buffer) + 6;                                 \
1314             }                                                                 \
1315             break;                                                            \
1316         case AL_FORMAT_61CHN##bits:                                           \
1317             for(i = 0;i < SamplesToDo;i++)                                    \
1318             {                                                                 \
1319                 ((type*)buffer)[0] = (func)(DryBuffer[i][FRONT_LEFT]);        \
1320                 ((type*)buffer)[1] = (func)(DryBuffer[i][FRONT_RIGHT]);       \
1321                 ((type*)buffer)[2] = (func)(DryBuffer[i][FRONT_CENTER]);      \
1322                 ((type*)buffer)[3] = (func)(DryBuffer[i][LFE]);               \
1323                 ((type*)buffer)[4] = (func)(DryBuffer[i][BACK_CENTER]);       \
1324                 ((type*)buffer)[5] = (func)(DryBuffer[i][SIDE_LEFT]);         \
1325                 ((type*)buffer)[6] = (func)(DryBuffer[i][SIDE_RIGHT]);        \
1326                 buffer = ((type*)buffer) + 7;                                 \
1327             }                                                                 \
1328             break;                                                            \
1329         case AL_FORMAT_71CHN##bits:                                           \
1330             for(i = 0;i < SamplesToDo;i++)                                    \
1331             {                                                                 \
1332                 ((type*)buffer)[0] = (func)(DryBuffer[i][FRONT_LEFT]);        \
1333                 ((type*)buffer)[1] = (func)(DryBuffer[i][FRONT_RIGHT]);       \
1334                 if(isWin) {                                                   \
1335                     ((type*)buffer)[2] = (func)(DryBuffer[i][FRONT_CENTER]);  \
1336                     ((type*)buffer)[3] = (func)(DryBuffer[i][LFE]);           \
1337                     ((type*)buffer)[4] = (func)(DryBuffer[i][BACK_LEFT]);     \
1338                     ((type*)buffer)[5] = (func)(DryBuffer[i][BACK_RIGHT]);    \
1339                 } else {                                                      \
1340                     ((type*)buffer)[2] = (func)(DryBuffer[i][BACK_LEFT]);     \
1341                     ((type*)buffer)[3] = (func)(DryBuffer[i][BACK_RIGHT]);    \
1342                     ((type*)buffer)[4] = (func)(DryBuffer[i][FRONT_CENTER]);  \
1343                     ((type*)buffer)[5] = (func)(DryBuffer[i][LFE]);           \
1344                 }                                                             \
1345                 ((ALubyte*)buffer)[6] = (func)(DryBuffer[i][SIDE_LEFT]);      \
1346                 ((ALubyte*)buffer)[7] = (func)(DryBuffer[i][SIDE_RIGHT]);     \
1347                 buffer = ((type*)buffer) + 8;                                 \
1348             }                                                                 \
1349             break;
1350
1351 #define AL_FORMAT_MONO32 AL_FORMAT_MONO_FLOAT32
1352 #define AL_FORMAT_STEREO32 AL_FORMAT_STEREO_FLOAT32
1353 #ifdef _WIN32
1354             CHECK_WRITE_FORMAT(8,  ALubyte, aluF2UB, 1)
1355             CHECK_WRITE_FORMAT(16, ALshort, aluF2S, 1)
1356             CHECK_WRITE_FORMAT(32, ALfloat, aluF2F, 1)
1357 #else
1358             CHECK_WRITE_FORMAT(8,  ALubyte, aluF2UB, 0)
1359             CHECK_WRITE_FORMAT(16, ALshort, aluF2S, 0)
1360             CHECK_WRITE_FORMAT(32, ALfloat, aluF2F, 0)
1361 #endif
1362 #undef AL_FORMAT_STEREO32
1363 #undef AL_FORMAT_MONO32
1364 #undef CHECK_WRITE_FORMAT
1365
1366             default:
1367                 break;
1368         }
1369
1370         size -= SamplesToDo;
1371     }
1372
1373 #if defined(HAVE_FESETROUND)
1374     fesetround(fpuState);
1375 #elif defined(HAVE__CONTROLFP)
1376     _controlfp(fpuState, 0xfffff);
1377 #endif
1378
1379     ProcessContext(NULL);
1380 }
1381
1382 ALvoid aluHandleDisconnect(ALCdevice *device)
1383 {
1384     if(device->Context)
1385     {
1386         ALsource *source;
1387
1388         SuspendContext(device->Context);
1389
1390         source = device->Context->Source;
1391         while(source)
1392         {
1393             if(source->state == AL_PLAYING)
1394             {
1395                 ALbufferlistitem *BufferListItem;
1396
1397                 source->state = AL_STOPPED;
1398                 source->inuse = AL_FALSE;
1399                 source->BuffersPlayed = source->BuffersInQueue;
1400                 BufferListItem = source->queue;
1401                 while(BufferListItem != NULL)
1402                 {
1403                     BufferListItem->bufferstate = PROCESSED;
1404                     BufferListItem = BufferListItem->next;
1405                 }
1406                 source->position = 0;
1407                 source->position_fraction = 0;
1408             }
1409             source = source->next;
1410         }
1411         ProcessContext(device->Context);
1412     }
1413
1414     device->Connected = ALC_FALSE;
1415 }