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 srcdata, ALuint srcfrac,
 125                             ALuint OutPos, ALuint SamplesToDo,
 126                             ALuint BufferSize);
 127
 128 enum Resampler {
 129     PointResampler,
 130     LinearResampler,
 131     CubicResampler,
 132
 133     ResamplerMax,
 134 };
 135
 136 enum Channel {
 137     FRONT_LEFT = 0,
 138     FRONT_RIGHT,
 139     FRONT_CENTER,
 140     LFE,
 141     BACK_LEFT,
 142     BACK_RIGHT,
 143     BACK_CENTER,
 144     SIDE_LEFT,
 145     SIDE_RIGHT,
 146
 147     MAXCHANNELS
 148 };
 149
 150 enum DistanceModel {
 151     InverseDistanceClamped  = AL_INVERSE_DISTANCE_CLAMPED,
 152     LinearDistanceClamped   = AL_LINEAR_DISTANCE_CLAMPED,
 153     ExponentDistanceClamped = AL_EXPONENT_DISTANCE_CLAMPED,
 154     InverseDistance  = AL_INVERSE_DISTANCE,
 155     LinearDistance   = AL_LINEAR_DISTANCE,
 156     ExponentDistance = AL_EXPONENT_DISTANCE,
 157     DisableDistance  = AL_NONE,
 158
 159     DefaultDistanceModel = InverseDistanceClamped
 160 };
 161
 162 #define BUFFERSIZE 4096
 163
 164 #define FRACTIONBITS (14)
 165 #define FRACTIONONE  (1<<FRACTIONBITS)
 166 #define FRACTIONMASK (FRACTIONONE-1)
 167
 168 /* Size for temporary stack storage of buffer data. Must be a multiple of the
 169  * size of ALfloat, ie, 4. Larger values need more stack, while smaller values
 170  * may need more iterations. The value needs to be a sensible size, however, as
 171  * it constrains the max stepping value used for mixing.
 172  * The mixer requires being able to do two samplings per mixing loop. A 16KB
 173  * buffer can hold 512 sample frames for a 7.1 float buffer. With the cubic
 174  * resampler (which requires 3 padding sample frames), this limits the maximum
 175  * step to about 508. This means that buffer_freq*source_pitch cannot exceed
 176  * device_freq*508 for an 8-channel 32-bit buffer. */
 177 #ifndef STACK_DATA_SIZE
 178 #define STACK_DATA_SIZE  16384
 179 #endif
 180
 181
 182 static __inline ALfloat minf(ALfloat a, ALfloat b)
 183 { return ((a > b) ? b : a); }
 184 static __inline ALfloat maxf(ALfloat a, ALfloat b)
 185 { return ((a > b) ? a : b); }
 186 static __inline ALfloat clampf(ALfloat val, ALfloat min, ALfloat max)
 187 { return minf(max, maxf(min, val)); }
 188
 189 static __inline ALuint minu(ALuint a, ALuint b)
 190 { return ((a > b) ? b : a); }
 191 static __inline ALuint maxu(ALuint a, ALuint b)
 192 { return ((a > b) ? a : b); }
 193 static __inline ALuint clampu(ALuint val, ALuint min, ALuint max)
 194 { return minu(max, maxu(min, val)); }
 195
 196 static __inline ALint mini(ALint a, ALint b)
 197 { return ((a > b) ? b : a); }
 198 static __inline ALint maxi(ALint a, ALint b)
 199 { return ((a > b) ? a : b); }
 200 static __inline ALint clampi(ALint val, ALint min, ALint max)
 201 { return mini(max, maxi(min, val)); }
 202
 203 static __inline ALint64 mini64(ALint64 a, ALint64 b)
 204 { return ((a > b) ? b : a); }
 205 static __inline ALint64 maxi64(ALint64 a, ALint64 b)
 206 { return ((a > b) ? a : b); }
 207 static __inline ALint64 clampi64(ALint64 val, ALint64 min, ALint64 max)
 208 { return mini64(max, maxi64(min, val)); }
 209
 210
 211 static __inline ALfloat lerp(ALfloat val1, ALfloat val2, ALfloat mu)
 212 {
 213     return val1 + (val2-val1)*mu;
 214 }
 215 static __inline ALfloat cubic(ALfloat val0, ALfloat val1, ALfloat val2, ALfloat val3, ALfloat mu)
 216 {
 217     ALfloat mu2 = mu*mu;
 218     ALfloat a0 = -0.5f*val0 +  1.5f*val1 + -1.5f*val2 +  0.5f*val3;
 219     ALfloat a1 =       val0 + -2.5f*val1 +  2.0f*val2 + -0.5f*val3;
 220     ALfloat a2 = -0.5f*val0              +  0.5f*val2;
 221     ALfloat a3 =                    val1;
 222
 223     return a0*mu*mu2 + a1*mu2 + a2*mu + a3;
 224 }
 225
 226
 227 static __inline int SetMixerFPUMode(void)
 228 {
 229 #if defined(_FPU_GETCW) && defined(_FPU_SETCW)
 230     fpu_control_t fpuState, newState;
 231     _FPU_GETCW(fpuState);
 232     newState = fpuState&~(_FPU_EXTENDED|_FPU_DOUBLE|_FPU_SINGLE |
 233                           _FPU_RC_NEAREST|_FPU_RC_DOWN|_FPU_RC_UP|_FPU_RC_ZERO);
 234     newState |= _FPU_SINGLE | _FPU_RC_ZERO;
 235     _FPU_SETCW(newState);
 236 #else
 237     int fpuState;
 238 #if defined(HAVE__CONTROLFP)
 239     fpuState = _controlfp(0, 0);
 240     (void)_controlfp(_RC_CHOP|_PC_24, _MCW_RC|_MCW_PC);
 241 #elif defined(HAVE_FESETROUND)
 242     fpuState = fegetround();
 243     fesetround(FE_TOWARDZERO);
 244 #endif
 245 #endif
 246     return fpuState;
 247 }
 248
 249 static __inline void RestoreFPUMode(int state)
 250 {
 251 #if defined(_FPU_GETCW) && defined(_FPU_SETCW)
 252     fpu_control_t fpuState = state;
 253     _FPU_SETCW(fpuState);
 254 #elif defined(HAVE__CONTROLFP)
 255     _controlfp(state, _MCW_RC|_MCW_PC);
 256 #elif defined(HAVE_FESETROUND)
 257     fesetround(state);
 258 #endif
 259 }
 260
 261
 262 static __inline void aluCrossproduct(const ALfloat *inVector1, const ALfloat *inVector2, ALfloat *outVector)
 263 {
 264     outVector[0] = inVector1[1]*inVector2[2] - inVector1[2]*inVector2[1];
 265     outVector[1] = inVector1[2]*inVector2[0] - inVector1[0]*inVector2[2];
 266     outVector[2] = inVector1[0]*inVector2[1] - inVector1[1]*inVector2[0];
 267 }
 268
 269 static __inline ALfloat aluDotproduct(const ALfloat *inVector1, const ALfloat *inVector2)
 270 {
 271     return inVector1[0]*inVector2[0] + inVector1[1]*inVector2[1] +
 272            inVector1[2]*inVector2[2];
 273 }
 274
 275 static __inline void aluNormalize(ALfloat *inVector)
 276 {
 277     ALfloat length, inverse_length;
 278
 279     length = aluSqrt(aluDotproduct(inVector, inVector));
 280     if(length > 0.0f)
 281     {
 282         inverse_length = 1.0f/length;
 283         inVector[0] *= inverse_length;
 284         inVector[1] *= inverse_length;
 285         inVector[2] *= inverse_length;
 286     }
 287 }
 288
 289
 290 ALvoid aluInitPanning(ALCdevice *Device);
 291 ALint aluCart2LUTpos(ALfloat re, ALfloat im);
 292
 293 ALvoid CalcSourceParams(struct ALsource *ALSource, const ALCcontext *ALContext);
 294 ALvoid CalcNonAttnSourceParams(struct ALsource *ALSource, const ALCcontext *ALContext);
 295
 296 MixerFunc SelectMixer(enum Resampler Resampler);
 297 MixerFunc SelectHrtfMixer(enum Resampler Resampler);
 298
 299 ALvoid MixSource(struct ALsource *Source, ALCdevice *Device, ALuint SamplesToDo);
 300
 301 ALvoid aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size);
 302 ALvoid aluHandleDisconnect(ALCdevice *device);
 303
 304 extern ALfloat ConeScale;
 305 extern ALfloat ZScale;
 306
 307 #ifdef __cplusplus
 308 }
 309 #endif
 310
 311 #endif
 312