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 { (float)sqrt(x); }
  55 #endif
  56
  57 #ifndef HAVE_COSF
  58 static __inline float cosf(float x)
  59 { (float)cos(x); }
  60 #endif
  61
  62 #ifndef HAVE_SINF
  63 static __inline float sinf(float x)
  64 { (float)sin(x); }
  65 #endif
  66
  67 #ifndef HAVE_ACOSF
  68 static __inline float acosf(float x)
  69 { (float)acos(x); }
  70 #endif
  71
  72 #ifndef HAVE_ASINF
  73 static __inline float asinf(float x)
  74 { (float)asin(x); }
  75 #endif
  76
  77 #ifndef HAVE_ATANF
  78 static __inline float atanf(float x)
  79 { (float)atan(x); }
  80 #endif
  81
  82 #ifndef HAVE_ATAN2F
  83 static __inline float atan2f(float x, float y)
  84 { (float)atan2(x, y); }
  85 #endif
  86
  87 #ifndef HAVE_FABSF
  88 static __inline float fabsf(float x)
  89 { (float)fabs(x); }
  90 #endif
  91
  92 #ifndef HAVE_LOG10F
  93 static __inline float log10f(float x)
  94 { (float)log10(x); }
  95 #endif
  96
  97 #ifndef HAVE_FLOORF
  98 static __inline float floorf(float x)
  99 { (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 srcfrac,
 114                                ALuint OutPos, ALuint SamplesToDo,
 115                                ALuint BufferSize);
 116 typedef ALvoid (*WetMixerFunc)(struct ALsource *self, ALuint sendidx,
 117                                struct SendParams *params,
 118                                const ALfloat *RESTRICT data, ALuint srcfrac,
 119                                ALuint OutPos, ALuint SamplesToDo,
 120                                ALuint BufferSize);
 121
 122 enum Resampler {
 123     PointResampler,
 124     LinearResampler,
 125     CubicResampler,
 126
 127     ResamplerMax,
 128 };
 129
 130 enum Channel {
 131     FrontLeft = 0,
 132     FrontRight,
 133     FrontCenter,
 134     LFE,
 135     BackLeft,
 136     BackRight,
 137     BackCenter,
 138     SideLeft,
 139     SideRight,
 140
 141     MaxChannels
 142 };
 143
 144 enum DistanceModel {
 145     InverseDistanceClamped  = AL_INVERSE_DISTANCE_CLAMPED,
 146     LinearDistanceClamped   = AL_LINEAR_DISTANCE_CLAMPED,
 147     ExponentDistanceClamped = AL_EXPONENT_DISTANCE_CLAMPED,
 148     InverseDistance  = AL_INVERSE_DISTANCE,
 149     LinearDistance   = AL_LINEAR_DISTANCE,
 150     ExponentDistance = AL_EXPONENT_DISTANCE,
 151     DisableDistance  = AL_NONE,
 152
 153     DefaultDistanceModel = InverseDistanceClamped
 154 };
 155
 156 #define BUFFERSIZE 4096
 157
 158 #define FRACTIONBITS (14)
 159 #define FRACTIONONE  (1<<FRACTIONBITS)
 160 #define FRACTIONMASK (FRACTIONONE-1)
 161
 162 /* Size for temporary stack storage of buffer data. Must be a multiple of the
 163  * size of ALfloat, ie, 4. Larger values need more stack, while smaller values
 164  * may need more iterations. The value needs to be a sensible size, however, as
 165  * it constrains the max stepping value used for mixing.
 166  * The mixer requires being able to do two samplings per mixing loop. A 16KB
 167  * buffer can hold 512 sample frames for a 7.1 float buffer. With the cubic
 168  * resampler (which requires 3 padding sample frames), this limits the maximum
 169  * step to about 508. This means that buffer_freq*source_pitch cannot exceed
 170  * device_freq*508 for an 8-channel 32-bit buffer. */
 171 #ifndef STACK_DATA_SIZE
 172 #define STACK_DATA_SIZE  16384
 173 #endif
 174
 175
 176 static __inline ALfloat minf(ALfloat a, ALfloat b)
 177 { return ((a > b) ? b : a); }
 178 static __inline ALfloat maxf(ALfloat a, ALfloat b)
 179 { return ((a > b) ? a : b); }
 180 static __inline ALfloat clampf(ALfloat val, ALfloat min, ALfloat max)
 181 { return minf(max, maxf(min, val)); }
 182
 183 static __inline ALuint minu(ALuint a, ALuint b)
 184 { return ((a > b) ? b : a); }
 185 static __inline ALuint maxu(ALuint a, ALuint b)
 186 { return ((a > b) ? a : b); }
 187 static __inline ALuint clampu(ALuint val, ALuint min, ALuint max)
 188 { return minu(max, maxu(min, val)); }
 189
 190 static __inline ALint mini(ALint a, ALint b)
 191 { return ((a > b) ? b : a); }
 192 static __inline ALint maxi(ALint a, ALint b)
 193 { return ((a > b) ? a : b); }
 194 static __inline ALint clampi(ALint val, ALint min, ALint max)
 195 { return mini(max, maxi(min, val)); }
 196
 197 static __inline ALint64 mini64(ALint64 a, ALint64 b)
 198 { return ((a > b) ? b : a); }
 199 static __inline ALint64 maxi64(ALint64 a, ALint64 b)
 200 { return ((a > b) ? a : b); }
 201 static __inline ALint64 clampi64(ALint64 val, ALint64 min, ALint64 max)
 202 { return mini64(max, maxi64(min, val)); }
 203
 204
 205 static __inline ALfloat lerp(ALfloat val1, ALfloat val2, ALfloat mu)
 206 {
 207     return val1 + (val2-val1)*mu;
 208 }
 209 static __inline ALfloat cubic(ALfloat val0, ALfloat val1, ALfloat val2, ALfloat val3, ALfloat mu)
 210 {
 211     ALfloat mu2 = mu*mu;
 212     ALfloat a0 = -0.5f*val0 +  1.5f*val1 + -1.5f*val2 +  0.5f*val3;
 213     ALfloat a1 =       val0 + -2.5f*val1 +  2.0f*val2 + -0.5f*val3;
 214     ALfloat a2 = -0.5f*val0              +  0.5f*val2;
 215     ALfloat a3 =                    val1;
 216
 217     return a0*mu*mu2 + a1*mu2 + a2*mu + a3;
 218 }
 219
 220
 221 static __inline int SetMixerFPUMode(void)
 222 {
 223 #if defined(_FPU_GETCW) && defined(_FPU_SETCW) && (defined(__i386__) || defined(__x86_64__))
 224     fpu_control_t fpuState, newState;
 225     _FPU_GETCW(fpuState);
 226     newState = fpuState&~(_FPU_EXTENDED|_FPU_DOUBLE|_FPU_SINGLE |
 227                           _FPU_RC_NEAREST|_FPU_RC_DOWN|_FPU_RC_UP|_FPU_RC_ZERO);
 228     newState |= _FPU_SINGLE | _FPU_RC_ZERO;
 229     _FPU_SETCW(newState);
 230 #else
 231     int fpuState;
 232 #if defined(HAVE__CONTROLFP)
 233     fpuState = _controlfp(0, 0);
 234     (void)_controlfp(_RC_CHOP|_PC_24, _MCW_RC|_MCW_PC);
 235 #elif defined(HAVE_FESETROUND)
 236     fpuState = fegetround();
 237 #ifdef FE_TOWARDZERO
 238     fesetround(FE_TOWARDZERO);
 239 #endif
 240 #endif
 241 #endif
 242     return fpuState;
 243 }
 244
 245 static __inline void RestoreFPUMode(int state)
 246 {
 247 #if defined(_FPU_GETCW) && defined(_FPU_SETCW) && (defined(__i386__) || defined(__x86_64__))
 248     fpu_control_t fpuState = state;
 249     _FPU_SETCW(fpuState);
 250 #elif defined(HAVE__CONTROLFP)
 251     _controlfp(state, _MCW_RC|_MCW_PC);
 252 #elif defined(HAVE_FESETROUND)
 253     fesetround(state);
 254 #endif
 255 }
 256
 257
 258 static __inline void aluCrossproduct(const ALfloat *inVector1, const ALfloat *inVector2, ALfloat *outVector)
 259 {
 260     outVector[0] = inVector1[1]*inVector2[2] - inVector1[2]*inVector2[1];
 261     outVector[1] = inVector1[2]*inVector2[0] - inVector1[0]*inVector2[2];
 262     outVector[2] = inVector1[0]*inVector2[1] - inVector1[1]*inVector2[0];
 263 }
 264
 265 static __inline ALfloat aluDotproduct(const ALfloat *inVector1, const ALfloat *inVector2)
 266 {
 267     return inVector1[0]*inVector2[0] + inVector1[1]*inVector2[1] +
 268            inVector1[2]*inVector2[2];
 269 }
 270
 271 static __inline void aluNormalize(ALfloat *inVector)
 272 {
 273     ALfloat lengthsqr = aluDotproduct(inVector, inVector);
 274     if(lengthsqr > 0.0f)
 275     {
 276         ALfloat inv_length = 1.0f/sqrtf(lengthsqr);
 277         inVector[0] *= inv_length;
 278         inVector[1] *= inv_length;
 279         inVector[2] *= inv_length;
 280     }
 281 }
 282
 283
 284 ALvoid aluInitPanning(ALCdevice *Device);
 285
 286 ALvoid ComputeAngleGains(const ALCdevice *device, ALfloat angle, ALfloat hwidth, ALfloat ingain, ALfloat *gains);
 287
 288 ALvoid CalcSourceParams(struct ALsource *ALSource, const ALCcontext *ALContext);
 289 ALvoid CalcNonAttnSourceParams(struct ALsource *ALSource, const ALCcontext *ALContext);
 290
 291 DryMixerFunc SelectDirectMixer(enum Resampler Resampler);
 292 DryMixerFunc SelectHrtfMixer(enum Resampler Resampler);
 293 WetMixerFunc SelectSendMixer(enum Resampler Resampler);
 294
 295 ALvoid MixSource(struct ALsource *Source, ALCdevice *Device, ALuint SamplesToDo);
 296
 297 ALvoid aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size);
 298 ALvoid aluHandleDisconnect(ALCdevice *device);
 299
 300 extern ALfloat ConeScale;
 301 extern ALfloat ZScale;
 302
 303 #ifdef __cplusplus
 304 }
 305 #endif
 306
 307 #endif
 308