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 #ifndef HAVE_POWF
  48 static __inline float powf(float x, float y)
  49 { return (float)pow(x, y); }
  50 #endif
  51
  52 #ifndef HAVE_SQRTF
  53 static __inline float sqrtf(float x)
  54 { return (float)sqrt(x); }
  55 #endif
  56
  57 #ifndef HAVE_COSF
  58 static __inline float cosf(float x)
  59 { return (float)cos(x); }
  60 #endif
  61
  62 #ifndef HAVE_SINF
  63 static __inline float sinf(float x)
  64 { return (float)sin(x); }
  65 #endif
  66
  67 #ifndef HAVE_ACOSF
  68 static __inline float acosf(float x)
  69 { return (float)acos(x); }
  70 #endif
  71
  72 #ifndef HAVE_ASINF
  73 static __inline float asinf(float x)
  74 { return (float)asin(x); }
  75 #endif
  76
  77 #ifndef HAVE_ATANF
  78 static __inline float atanf(float x)
  79 { return (float)atan(x); }
  80 #endif
  81
  82 #ifndef HAVE_ATAN2F
  83 static __inline float atan2f(float x, float y)
  84 { return (float)atan2(x, y); }
  85 #endif
  86
  87 #ifndef HAVE_FABSF
  88 static __inline float fabsf(float x)
  89 { return (float)fabs(x); }
  90 #endif
  91
  92 #ifndef HAVE_LOG10F
  93 static __inline float log10f(float x)
  94 { return (float)log10(x); }
  95 #endif
  96
  97 #ifndef HAVE_FLOORF
  98 static __inline float floorf(float x)
  99 { return (float)floor(x); }
 100 #endif
 101
 102 #ifdef __cplusplus
 103 extern "C" {
 104 #endif
 105
 106 struct ALsource;
 107 struct ALbuffer;
 108 struct DirectParams;
 109 struct SendParams;
 110
 111 typedef ALvoid (*DryMixerFunc)(struct ALsource *self, ALCdevice *Device,
 112                                struct DirectParams *params,
 113                                const ALfloat *RESTRICT data, ALuint srcchan,
 114                                ALuint OutPos, ALuint SamplesToDo,
 115                                ALuint BufferSize);
 116 typedef ALvoid (*WetMixerFunc)(struct SendParams *params,
 117                                const ALfloat *RESTRICT data, ALuint srcchan,
 118                                ALuint OutPos, ALuint SamplesToDo,
 119                                ALuint BufferSize);
 120
 121 enum Resampler {
 122     PointResampler,
 123     LinearResampler,
 124     CubicResampler,
 125
 126     ResamplerMax,
 127 };
 128
 129 enum Channel {
 130     FrontLeft = 0,
 131     FrontRight,
 132     FrontCenter,
 133     LFE,
 134     BackLeft,
 135     BackRight,
 136     BackCenter,
 137     SideLeft,
 138     SideRight,
 139
 140     MaxChannels,
 141 };
 142
 143 enum DistanceModel {
 144     InverseDistanceClamped  = AL_INVERSE_DISTANCE_CLAMPED,
 145     LinearDistanceClamped   = AL_LINEAR_DISTANCE_CLAMPED,
 146     ExponentDistanceClamped = AL_EXPONENT_DISTANCE_CLAMPED,
 147     InverseDistance  = AL_INVERSE_DISTANCE,
 148     LinearDistance   = AL_LINEAR_DISTANCE,
 149     ExponentDistance = AL_EXPONENT_DISTANCE,
 150     DisableDistance  = AL_NONE,
 151
 152     DefaultDistanceModel = InverseDistanceClamped
 153 };
 154
 155
 156 /* Size for temporary storage of buffer data, in ALfloats. Larger values need
 157  * more stack, while smaller values may need more iterations. The value needs
 158  * to be a sensible size, however, as it constrains the max stepping value used
 159  * for mixing, as well as the maximum number of samples per mixing iteration.
 160  * The mixer requires being able to do two samplings per mixing loop. A 16KB
 161  * buffer can hold 512 sample frames for a 7.1 float buffer. With the cubic
 162  * resampler (which requires 3 padding sample frames), this limits the maximum
 163  * step to about 508. This means that buffer_freq*source_pitch cannot exceed
 164  * device_freq*508 for an 8-channel 32-bit buffer.
 165  */
 166 #ifndef BUFFERSIZE
 167 #define BUFFERSIZE 4096
 168 #endif
 169
 170 #define FRACTIONBITS (14)
 171 #define FRACTIONONE  (1<<FRACTIONBITS)
 172 #define FRACTIONMASK (FRACTIONONE-1)
 173
 174
 175 static __inline ALfloat minf(ALfloat a, ALfloat b)
 176 { return ((a > b) ? b : a); }
 177 static __inline ALfloat maxf(ALfloat a, ALfloat b)
 178 { return ((a > b) ? a : b); }
 179 static __inline ALfloat clampf(ALfloat val, ALfloat min, ALfloat max)
 180 { return minf(max, maxf(min, val)); }
 181
 182 static __inline ALuint minu(ALuint a, ALuint b)
 183 { return ((a > b) ? b : a); }
 184 static __inline ALuint maxu(ALuint a, ALuint b)
 185 { return ((a > b) ? a : b); }
 186 static __inline ALuint clampu(ALuint val, ALuint min, ALuint max)
 187 { return minu(max, maxu(min, val)); }
 188
 189 static __inline ALint mini(ALint a, ALint b)
 190 { return ((a > b) ? b : a); }
 191 static __inline ALint maxi(ALint a, ALint b)
 192 { return ((a > b) ? a : b); }
 193 static __inline ALint clampi(ALint val, ALint min, ALint max)
 194 { return mini(max, maxi(min, val)); }
 195
 196 static __inline ALint64 mini64(ALint64 a, ALint64 b)
 197 { return ((a > b) ? b : a); }
 198 static __inline ALint64 maxi64(ALint64 a, ALint64 b)
 199 { return ((a > b) ? a : b); }
 200 static __inline ALint64 clampi64(ALint64 val, ALint64 min, ALint64 max)
 201 { return mini64(max, maxi64(min, val)); }
 202
 203 static __inline ALuint64 minu64(ALuint64 a, ALuint64 b)
 204 { return ((a > b) ? b : a); }
 205 static __inline ALuint64 maxu64(ALuint64 a, ALuint64 b)
 206 { return ((a > b) ? a : b); }
 207 static __inline ALuint64 clampu64(ALuint64 val, ALuint64 min, ALuint64 max)
 208 { return minu64(max, maxu64(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) && (defined(__i386__) || defined(__x86_64__))
 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 #ifdef FE_TOWARDZERO
 244     fesetround(FE_TOWARDZERO);
 245 #endif
 246 #endif
 247 #endif
 248     return fpuState;
 249 }
 250
 251 static __inline void RestoreFPUMode(int state)
 252 {
 253 #if defined(_FPU_GETCW) && defined(_FPU_SETCW) && (defined(__i386__) || defined(__x86_64__))
 254     fpu_control_t fpuState = state;
 255     _FPU_SETCW(fpuState);
 256 #elif defined(HAVE__CONTROLFP)
 257     _controlfp(state, _MCW_RC|_MCW_PC);
 258 #elif defined(HAVE_FESETROUND)
 259     fesetround(state);
 260 #endif
 261 }
 262
 263
 264 static __inline void aluCrossproduct(const ALfloat *inVector1, const ALfloat *inVector2, ALfloat *outVector)
 265 {
 266     outVector[0] = inVector1[1]*inVector2[2] - inVector1[2]*inVector2[1];
 267     outVector[1] = inVector1[2]*inVector2[0] - inVector1[0]*inVector2[2];
 268     outVector[2] = inVector1[0]*inVector2[1] - inVector1[1]*inVector2[0];
 269 }
 270
 271 static __inline ALfloat aluDotproduct(const ALfloat *inVector1, const ALfloat *inVector2)
 272 {
 273     return inVector1[0]*inVector2[0] + inVector1[1]*inVector2[1] +
 274            inVector1[2]*inVector2[2];
 275 }
 276
 277 static __inline void aluNormalize(ALfloat *inVector)
 278 {
 279     ALfloat lengthsqr = aluDotproduct(inVector, inVector);
 280     if(lengthsqr > 0.0f)
 281     {
 282         ALfloat inv_length = 1.0f/sqrtf(lengthsqr);
 283         inVector[0] *= inv_length;
 284         inVector[1] *= inv_length;
 285         inVector[2] *= inv_length;
 286     }
 287 }
 288
 289
 290 ALvoid aluInitPanning(ALCdevice *Device);
 291
 292 ALvoid ComputeAngleGains(const ALCdevice *device, ALfloat angle, ALfloat hwidth, ALfloat ingain, ALfloat *gains);
 293
 294 ALvoid CalcSourceParams(struct ALsource *ALSource, const ALCcontext *ALContext);
 295 ALvoid CalcNonAttnSourceParams(struct ALsource *ALSource, const ALCcontext *ALContext);
 296
 297 DryMixerFunc SelectDirectMixer(void);
 298 DryMixerFunc SelectHrtfMixer(void);
 299 WetMixerFunc SelectSendMixer(void);
 300
 301 ALvoid MixSource(struct ALsource *Source, ALCdevice *Device, ALuint SamplesToDo);
 302
 303 ALvoid aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size);
 304 ALvoid aluHandleDisconnect(ALCdevice *device);
 305
 306 extern ALfloat ConeScale;
 307 extern ALfloat ZScale;
 308
 309 #ifdef __cplusplus
 310 }
 311 #endif
 312
 313 #endif
 314