OpenAL32/Include/alu.h

   1 #ifndef _ALU_H_
   2 #define _ALU_H_
   3
   4 #include "alMain.h"
   5
   6 #include <limits.h>
   7 #include <math.h>
   8 #ifdef HAVE_FLOAT_H
   9 #include <float.h>
  10 #endif
  11 #ifdef HAVE_IEEEFP_H
  12 #include <ieeefp.h>
  13 #endif
  14
  15
  16 #define F_PI    (3.14159265358979323846f)  /* pi */
  17 #define F_PI_2  (1.57079632679489661923f)  /* pi/2 */
  18
  19 #ifndef FLT_EPSILON
  20 #define FLT_EPSILON (1.19209290e-07f)
  21 #endif
  22
  23
  24 #ifndef HAVE_POWF
  25 static __inline float powf(float x, float y)
  26 { return (float)pow(x, y); }
  27 #endif
  28
  29 #ifndef HAVE_SQRTF
  30 static __inline float sqrtf(float x)
  31 { return (float)sqrt(x); }
  32 #endif
  33
  34 #ifndef HAVE_COSF
  35 static __inline float cosf(float x)
  36 { return (float)cos(x); }
  37 #endif
  38
  39 #ifndef HAVE_SINF
  40 static __inline float sinf(float x)
  41 { return (float)sin(x); }
  42 #endif
  43
  44 #ifndef HAVE_ACOSF
  45 static __inline float acosf(float x)
  46 { return (float)acos(x); }
  47 #endif
  48
  49 #ifndef HAVE_ASINF
  50 static __inline float asinf(float x)
  51 { return (float)asin(x); }
  52 #endif
  53
  54 #ifndef HAVE_ATANF
  55 static __inline float atanf(float x)
  56 { return (float)atan(x); }
  57 #endif
  58
  59 #ifndef HAVE_ATAN2F
  60 static __inline float atan2f(float x, float y)
  61 { return (float)atan2(x, y); }
  62 #endif
  63
  64 #ifndef HAVE_FABSF
  65 static __inline float fabsf(float x)
  66 { return (float)fabs(x); }
  67 #endif
  68
  69 #ifndef HAVE_LOG10F
  70 static __inline float log10f(float x)
  71 { return (float)log10(x); }
  72 #endif
  73
  74 #ifndef HAVE_FLOORF
  75 static __inline float floorf(float x)
  76 { return (float)floor(x); }
  77 #endif
  78
  79 #ifdef __cplusplus
  80 extern "C" {
  81 #endif
  82
  83 struct ALsource;
  84 struct ALbuffer;
  85 struct DirectParams;
  86 struct SendParams;
  87
  88 typedef void (*ResamplerFunc)(const ALfloat *src, ALuint frac, ALuint increment,
  89                               ALfloat *RESTRICT dst, ALuint dstlen);
  90
  91 typedef ALvoid (*DryMixerFunc)(const struct DirectParams *params,
  92                                const ALfloat *RESTRICT data, ALuint srcchan,
  93                                ALuint OutPos, ALuint SamplesToDo,
  94                                ALuint BufferSize);
  95 typedef ALvoid (*WetMixerFunc)(const struct SendParams *params,
  96                                const ALfloat *RESTRICT data,
  97                                ALuint OutPos, ALuint SamplesToDo,
  98                                ALuint BufferSize);
  99
 100
 101 #define SPEEDOFSOUNDMETRESPERSEC  (343.3f)
 102 #define AIRABSORBGAINHF           (0.99426f) /* -0.05dB */
 103
 104 #define FRACTIONBITS (14)
 105 #define FRACTIONONE  (1<<FRACTIONBITS)
 106 #define FRACTIONMASK (FRACTIONONE-1)
 107
 108
 109 static __inline ALfloat minf(ALfloat a, ALfloat b)
 110 { return ((a > b) ? b : a); }
 111 static __inline ALfloat maxf(ALfloat a, ALfloat b)
 112 { return ((a > b) ? a : b); }
 113 static __inline ALfloat clampf(ALfloat val, ALfloat min, ALfloat max)
 114 { return minf(max, maxf(min, val)); }
 115
 116 static __inline ALuint minu(ALuint a, ALuint b)
 117 { return ((a > b) ? b : a); }
 118 static __inline ALuint maxu(ALuint a, ALuint b)
 119 { return ((a > b) ? a : b); }
 120 static __inline ALuint clampu(ALuint val, ALuint min, ALuint max)
 121 { return minu(max, maxu(min, val)); }
 122
 123 static __inline ALint mini(ALint a, ALint b)
 124 { return ((a > b) ? b : a); }
 125 static __inline ALint maxi(ALint a, ALint b)
 126 { return ((a > b) ? a : b); }
 127 static __inline ALint clampi(ALint val, ALint min, ALint max)
 128 { return mini(max, maxi(min, val)); }
 129
 130 static __inline ALint64 mini64(ALint64 a, ALint64 b)
 131 { return ((a > b) ? b : a); }
 132 static __inline ALint64 maxi64(ALint64 a, ALint64 b)
 133 { return ((a > b) ? a : b); }
 134 static __inline ALint64 clampi64(ALint64 val, ALint64 min, ALint64 max)
 135 { return mini64(max, maxi64(min, val)); }
 136
 137 static __inline ALuint64 minu64(ALuint64 a, ALuint64 b)
 138 { return ((a > b) ? b : a); }
 139 static __inline ALuint64 maxu64(ALuint64 a, ALuint64 b)
 140 { return ((a > b) ? a : b); }
 141 static __inline ALuint64 clampu64(ALuint64 val, ALuint64 min, ALuint64 max)
 142 { return minu64(max, maxu64(min, val)); }
 143
 144
 145 static __inline ALfloat lerp(ALfloat val1, ALfloat val2, ALfloat mu)
 146 {
 147     return val1 + (val2-val1)*mu;
 148 }
 149 static __inline ALfloat cubic(ALfloat val0, ALfloat val1, ALfloat val2, ALfloat val3, ALfloat mu)
 150 {
 151     ALfloat mu2 = mu*mu;
 152     ALfloat a0 = -0.5f*val0 +  1.5f*val1 + -1.5f*val2 +  0.5f*val3;
 153     ALfloat a1 =       val0 + -2.5f*val1 +  2.0f*val2 + -0.5f*val3;
 154     ALfloat a2 = -0.5f*val0              +  0.5f*val2;
 155     ALfloat a3 =                    val1;
 156
 157     return a0*mu*mu2 + a1*mu2 + a2*mu + a3;
 158 }
 159
 160
 161 static __inline void aluCrossproduct(const ALfloat *inVector1, const ALfloat *inVector2, ALfloat *outVector)
 162 {
 163     outVector[0] = inVector1[1]*inVector2[2] - inVector1[2]*inVector2[1];
 164     outVector[1] = inVector1[2]*inVector2[0] - inVector1[0]*inVector2[2];
 165     outVector[2] = inVector1[0]*inVector2[1] - inVector1[1]*inVector2[0];
 166 }
 167
 168 static __inline ALfloat aluDotproduct(const ALfloat *inVector1, const ALfloat *inVector2)
 169 {
 170     return inVector1[0]*inVector2[0] + inVector1[1]*inVector2[1] +
 171            inVector1[2]*inVector2[2];
 172 }
 173
 174 static __inline void aluNormalize(ALfloat *inVector)
 175 {
 176     ALfloat lengthsqr = aluDotproduct(inVector, inVector);
 177     if(lengthsqr > 0.0f)
 178     {
 179         ALfloat inv_length = 1.0f/sqrtf(lengthsqr);
 180         inVector[0] *= inv_length;
 181         inVector[1] *= inv_length;
 182         inVector[2] *= inv_length;
 183     }
 184 }
 185
 186
 187 ALvoid aluInitPanning(ALCdevice *Device);
 188
 189 ALvoid ComputeAngleGains(const ALCdevice *device, ALfloat angle, ALfloat hwidth, ALfloat ingain, ALfloat *gains);
 190
 191 ALvoid CalcSourceParams(struct ALsource *ALSource, const ALCcontext *ALContext);
 192 ALvoid CalcNonAttnSourceParams(struct ALsource *ALSource, const ALCcontext *ALContext);
 193
 194 ALvoid MixSource(struct ALsource *Source, ALCdevice *Device, ALuint SamplesToDo);
 195
 196 ALvoid aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size);
 197 ALvoid aluHandleDisconnect(ALCdevice *device);
 198
 199 extern ALfloat ConeScale;
 200 extern ALfloat ZScale;
 201
 202 #ifdef __cplusplus
 203 }
 204 #endif
 205
 206 #endif
 207