OpenAL32/Include/alu.h

   1 #ifndef _ALU_H_
   2 #define _ALU_H_
   3
   4 #include "AL/al.h"
   5 #include "AL/alc.h"
   6 #include "AL/alext.h"
   7
   8 #include <limits.h>
   9 #include <math.h>
  10 #ifdef HAVE_FLOAT_H
  11 #include <float.h>
  12 /* HACK: Seems cross-compiling with MinGW includes the wrong float.h, which
  13  * doesn't define Windows' _controlfp and related macros */
  14 #if defined(__MINGW32__) && !defined(_RC_CHOP)
  15 /* Control word masks for unMask */
  16 #define _MCW_EM         0x0008001F      /* Error masks */
  17 #define _MCW_IC         0x00040000      /* Infinity */
  18 #define _MCW_RC         0x00000300      /* Rounding */
  19 #define _MCW_PC         0x00030000      /* Precision */
  20 /* Control word values for unNew (use with related unMask above) */
  21 #define _EM_INVALID     0x00000010
  22 #define _EM_DENORMAL    0x00080000
  23 #define _EM_ZERODIVIDE  0x00000008
  24 #define _EM_OVERFLOW    0x00000004
  25 #define _EM_UNDERFLOW   0x00000002
  26 #define _EM_INEXACT     0x00000001
  27 #define _IC_AFFINE      0x00040000
  28 #define _IC_PROJECTIVE  0x00000000
  29 #define _RC_CHOP        0x00000300
  30 #define _RC_UP          0x00000200
  31 #define _RC_DOWN        0x00000100
  32 #define _RC_NEAR        0x00000000
  33 #define _PC_24          0x00020000
  34 #define _PC_53          0x00010000
  35 #define _PC_64          0x00000000
  36 _CRTIMP unsigned int __cdecl __MINGW_NOTHROW _controlfp (unsigned int unNew, unsigned int unMask);
  37 #endif
  38 #endif
  39 #ifdef HAVE_IEEEFP_H
  40 #include <ieeefp.h>
  41 #endif
  42
  43
  44 #define F_PI    (3.14159265358979323846f)  /* pi */
  45 #define F_PI_2  (1.57079632679489661923f)  /* pi/2 */
  46
  47 #ifdef HAVE_POWF
  48 #define aluPow(x,y) (powf((x),(y)))
  49 #else
  50 #define aluPow(x,y) ((ALfloat)pow((double)(x),(double)(y)))
  51 #endif
  52
  53 #ifdef HAVE_SQRTF
  54 #define aluSqrt(x) (sqrtf((x)))
  55 #else
  56 #define aluSqrt(x) ((ALfloat)sqrt((double)(x)))
  57 #endif
  58
  59 #ifdef HAVE_COSF
  60 #define aluCos(x) (cosf((x)))
  61 #else
  62 #define aluCos(x) ((ALfloat)cos((double)(x)))
  63 #endif
  64
  65 #ifdef HAVE_SINF
  66 #define aluSin(x) (sinf((x)))
  67 #else
  68 #define aluSin(x) ((ALfloat)sin((double)(x)))
  69 #endif
  70
  71 #ifdef HAVE_ACOSF
  72 #define aluAcos(x) (acosf((x)))
  73 #else
  74 #define aluAcos(x) ((ALfloat)acos((double)(x)))
  75 #endif
  76
  77 #ifdef HAVE_ASINF
  78 #define aluAsin(x) (asinf((x)))
  79 #else
  80 #define aluAsin(x) ((ALfloat)asin((double)(x)))
  81 #endif
  82
  83 #ifdef HAVE_ATANF
  84 #define aluAtan(x) (atanf((x)))
  85 #else
  86 #define aluAtan(x) ((ALfloat)atan((double)(x)))
  87 #endif
  88
  89 #ifdef HAVE_ATAN2F
  90 #define aluAtan2(x,y) (atan2f((x),(y)))
  91 #else
  92 #define aluAtan2(x,y) ((ALfloat)atan2((double)(x),(double)(y)))
  93 #endif
  94
  95 #ifdef HAVE_FABSF
  96 #define aluFabs(x) (fabsf((x)))
  97 #else
  98 #define aluFabs(x) ((ALfloat)fabs((double)(x)))
  99 #endif
 100
 101 #ifdef HAVE_LOG10F
 102 #define aluLog10(x) (log10f((x)))
 103 #else
 104 #define aluLog10(x) ((ALfloat)log10((double)(x)))
 105 #endif
 106
 107 #ifdef HAVE_FLOORF
 108 #define aluFloor(x) (floorf((x)))
 109 #else
 110 #define aluFloor(x) ((ALfloat)floor((double)(x)))
 111 #endif
 112
 113 #define QUADRANT_NUM  128
 114 #define LUT_NUM       (4 * QUADRANT_NUM)
 115
 116 #ifdef __cplusplus
 117 extern "C" {
 118 #endif
 119
 120 struct ALsource;
 121 struct ALbuffer;
 122
 123 typedef ALvoid (*MixerFunc)(struct ALsource *self, ALCdevice *Device,
 124                             const ALvoid *RESTRICT data,
 125                             ALuint *DataPosInt, ALuint *DataPosFrac,
 126                             ALuint OutPos, ALuint SamplesToDo,
 127                             ALuint BufferSize);
 128
 129 enum Resampler {
 130     POINT_RESAMPLER = 0,
 131     LINEAR_RESAMPLER,
 132     CUBIC_RESAMPLER,
 133
 134     RESAMPLER_MAX,
 135     RESAMPLER_MIN = -1,
 136     RESAMPLER_DEFAULT = LINEAR_RESAMPLER
 137 };
 138
 139 enum Channel {
 140     FRONT_LEFT = 0,
 141     FRONT_RIGHT,
 142     FRONT_CENTER,
 143     LFE,
 144     BACK_LEFT,
 145     BACK_RIGHT,
 146     BACK_CENTER,
 147     SIDE_LEFT,
 148     SIDE_RIGHT,
 149
 150     MAXCHANNELS
 151 };
 152
 153 enum DistanceModel {
 154     InverseDistanceClamped  = AL_INVERSE_DISTANCE_CLAMPED,
 155     LinearDistanceClamped   = AL_LINEAR_DISTANCE_CLAMPED,
 156     ExponentDistanceClamped = AL_EXPONENT_DISTANCE_CLAMPED,
 157     InverseDistance  = AL_INVERSE_DISTANCE,
 158     LinearDistance   = AL_LINEAR_DISTANCE,
 159     ExponentDistance = AL_EXPONENT_DISTANCE,
 160     DisableDistance  = AL_NONE
 161 };
 162
 163 #define BUFFERSIZE 4096
 164
 165 #define FRACTIONBITS (14)
 166 #define FRACTIONONE  (1<<FRACTIONBITS)
 167 #define FRACTIONMASK (FRACTIONONE-1)
 168
 169 /* Size for temporary stack storage of buffer data. Must be a multiple of the
 170  * size of ALfloat, ie, 4. Larger values need more stack, while smaller values
 171  * may need more iterations. The value needs to be a sensible size, however, as
 172  * it constrains the max stepping value used for mixing.
 173  * The mixer requires being able to do two samplings per mixing loop. A 16KB
 174  * buffer can hold 512 sample frames for a 7.1 float buffer. With the cubic
 175  * resampler (which requires 3 padding sample frames), this limits the maximum
 176  * step to about 508. This means that buffer_freq*source_pitch cannot exceed
 177  * device_freq*508 for an 8-channel 32-bit buffer. */
 178 #ifndef STACK_DATA_SIZE
 179 #define STACK_DATA_SIZE  16384
 180 #endif
 181
 182
 183 static __inline ALfloat minf(ALfloat a, ALfloat b)
 184 { return ((a > b) ? b : a); }
 185 static __inline ALfloat maxf(ALfloat a, ALfloat b)
 186 { return ((a > b) ? a : b); }
 187 static __inline ALfloat clampf(ALfloat val, ALfloat min, ALfloat max)
 188 { return minf(max, maxf(min, val)); }
 189
 190 static __inline ALuint minu(ALuint a, ALuint b)
 191 { return ((a > b) ? b : a); }
 192 static __inline ALuint maxu(ALuint a, ALuint b)
 193 { return ((a > b) ? a : b); }
 194 static __inline ALuint clampu(ALuint val, ALuint min, ALuint max)
 195 { return minu(max, maxu(min, val)); }
 196
 197 static __inline ALint mini(ALint a, ALint b)
 198 { return ((a > b) ? b : a); }
 199 static __inline ALint maxi(ALint a, ALint b)
 200 { return ((a > b) ? a : b); }
 201 static __inline ALint clampi(ALint val, ALint min, ALint max)
 202 { return mini(max, maxi(min, val)); }
 203
 204 static __inline ALint64 mini64(ALint64 a, ALint64 b)
 205 { return ((a > b) ? b : a); }
 206 static __inline ALint64 maxi64(ALint64 a, ALint64 b)
 207 { return ((a > b) ? a : b); }
 208 static __inline ALint64 clampi64(ALint64 val, ALint64 min, ALint64 max)
 209 { return mini64(max, maxi64(min, val)); }
 210
 211
 212 static __inline ALfloat lerp(ALfloat val1, ALfloat val2, ALfloat mu)
 213 {
 214     return val1 + (val2-val1)*mu;
 215 }
 216 static __inline ALfloat cubic(ALfloat val0, ALfloat val1, ALfloat val2, ALfloat val3, ALfloat mu)
 217 {
 218     ALfloat mu2 = mu*mu;
 219     ALfloat a0 = -0.5f*val0 +  1.5f*val1 + -1.5f*val2 +  0.5f*val3;
 220     ALfloat a1 =       val0 + -2.5f*val1 +  2.0f*val2 + -0.5f*val3;
 221     ALfloat a2 = -0.5f*val0              +  0.5f*val2;
 222     ALfloat a3 =                    val1;
 223
 224     return a0*mu*mu2 + a1*mu2 + a2*mu + a3;
 225 }
 226
 227
 228 static __inline int SetMixerFPUMode(void)
 229 {
 230 #if defined(_FPU_GETCW) && defined(_FPU_SETCW)
 231     fpu_control_t fpuState, newState;
 232     _FPU_GETCW(fpuState);
 233     newState = fpuState&~(_FPU_EXTENDED|_FPU_DOUBLE|_FPU_SINGLE |
 234                           _FPU_RC_NEAREST|_FPU_RC_DOWN|_FPU_RC_UP|_FPU_RC_ZERO);
 235     newState |= _FPU_SINGLE | _FPU_RC_ZERO;
 236     _FPU_SETCW(newState);
 237 #else
 238     int fpuState;
 239 #if defined(HAVE__CONTROLFP)
 240     fpuState = _controlfp(0, 0);
 241     (void)_controlfp(_RC_CHOP|_PC_24, _MCW_RC|_MCW_PC);
 242 #elif defined(HAVE_FESETROUND)
 243     fpuState = fegetround();
 244     fesetround(FE_TOWARDZERO);
 245 #endif
 246 #endif
 247     return fpuState;
 248 }
 249
 250 static __inline void RestoreFPUMode(int state)
 251 {
 252 #if defined(_FPU_GETCW) && defined(_FPU_SETCW)
 253     fpu_control_t fpuState = state;
 254     _FPU_SETCW(fpuState);
 255 #elif defined(HAVE__CONTROLFP)
 256     _controlfp(state, _MCW_RC|_MCW_PC);
 257 #elif defined(HAVE_FESETROUND)
 258     fesetround(state);
 259 #endif
 260 }
 261
 262
 263 static __inline void aluCrossproduct(const ALfloat *inVector1, const ALfloat *inVector2, ALfloat *outVector)
 264 {
 265     outVector[0] = inVector1[1]*inVector2[2] - inVector1[2]*inVector2[1];
 266     outVector[1] = inVector1[2]*inVector2[0] - inVector1[0]*inVector2[2];
 267     outVector[2] = inVector1[0]*inVector2[1] - inVector1[1]*inVector2[0];
 268 }
 269
 270 static __inline ALfloat aluDotproduct(const ALfloat *inVector1, const ALfloat *inVector2)
 271 {
 272     return inVector1[0]*inVector2[0] + inVector1[1]*inVector2[1] +
 273            inVector1[2]*inVector2[2];
 274 }
 275
 276 static __inline void aluNormalize(ALfloat *inVector)
 277 {
 278     ALfloat length, inverse_length;
 279
 280     length = aluSqrt(aluDotproduct(inVector, inVector));
 281     if(length > 0.0f)
 282     {
 283         inverse_length = 1.0f/length;
 284         inVector[0] *= inverse_length;
 285         inVector[1] *= inverse_length;
 286         inVector[2] *= inverse_length;
 287     }
 288 }
 289
 290
 291 ALvoid aluInitPanning(ALCdevice *Device);
 292 ALint aluCart2LUTpos(ALfloat re, ALfloat im);
 293
 294 ALvoid CalcSourceParams(struct ALsource *ALSource, const ALCcontext *ALContext);
 295 ALvoid CalcNonAttnSourceParams(struct ALsource *ALSource, const ALCcontext *ALContext);
 296
 297 MixerFunc SelectMixer(enum Resampler Resampler);
 298 MixerFunc SelectHrtfMixer(enum Resampler Resampler);
 299
 300 ALvoid MixSource(struct ALsource *Source, ALCdevice *Device, ALuint SamplesToDo);
 301
 302 ALvoid aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size);
 303 ALvoid aluHandleDisconnect(ALCdevice *device);
 304
 305 extern ALfloat ConeScale;
 306 extern ALfloat ZScale;
 307
 308 #ifdef __cplusplus
 309 }
 310 #endif
 311
 312 #endif
 313