OpenAL32/Include/alu.h

   1 #ifndef _ALU_H_
   2 #define _ALU_H_
   3
   4 #include <limits.h>
   5 #include <math.h>
   6 #ifdef HAVE_FLOAT_H
   7 #include <float.h>
   8 #endif
   9 #ifdef HAVE_IEEEFP_H
  10 #include <ieeefp.h>
  11 #endif
  12
  13 #include "alMain.h"
  14 #include "alBuffer.h"
  15 #include "alFilter.h"
  16
  17 #include "hrtf.h"
  18 #include "align.h"
  19
  20
  21 #define F_PI    (3.14159265358979323846f)
  22 #define F_PI_2  (1.57079632679489661923f)
  23 #define F_2PI   (6.28318530717958647692f)
  24
  25 #ifndef FLT_EPSILON
  26 #define FLT_EPSILON (1.19209290e-07f)
  27 #endif
  28
  29 #define DEG2RAD(x)  ((ALfloat)(x) * (F_PI/180.0f))
  30 #define RAD2DEG(x)  ((ALfloat)(x) * (180.0f/F_PI))
  31
  32
  33 #define MAX_PITCH  (10)
  34
  35
  36 #ifdef __cplusplus
  37 extern "C" {
  38 #endif
  39
  40 struct ALsource;
  41 struct ALvoice;
  42
  43
  44 enum ActiveFilters {
  45     AF_None = 0,
  46     AF_LowPass = 1,
  47     AF_HighPass = 2,
  48     AF_BandPass = AF_LowPass | AF_HighPass
  49 };
  50
  51
  52 typedef struct MixGains {
  53     ALfloat Current;
  54     ALfloat Step;
  55     ALfloat Target;
  56 } MixGains;
  57
  58
  59 typedef struct DirectParams {
  60     ALfloat (*OutBuffer)[BUFFERSIZE];
  61     ALuint OutChannels;
  62
  63     /* If not 'moving', gain/coefficients are set directly without fading. */
  64     ALboolean Moving;
  65     /* Stepping counter for gain/coefficient fading. */
  66     ALuint Counter;
  67     /* Last direction (relative to listener) and gain of a moving source. */
  68     ALfloat LastDir[3];
  69     ALfloat LastGain;
  70
  71     struct {
  72         enum ActiveFilters ActiveType;
  73         ALfilterState LowPass;
  74         ALfilterState HighPass;
  75     } Filters[MAX_INPUT_CHANNELS];
  76
  77     struct {
  78         HrtfParams Params[MAX_INPUT_CHANNELS];
  79         HrtfState State[MAX_INPUT_CHANNELS];
  80         ALuint IrSize;
  81     } Hrtf;
  82     MixGains Gains[MAX_INPUT_CHANNELS][MAX_OUTPUT_CHANNELS];
  83 } DirectParams;
  84
  85 typedef struct SendParams {
  86     ALfloat (*OutBuffer)[BUFFERSIZE];
  87
  88     ALboolean Moving;
  89     ALuint Counter;
  90
  91     struct {
  92         enum ActiveFilters ActiveType;
  93         ALfilterState LowPass;
  94         ALfilterState HighPass;
  95     } Filters[MAX_INPUT_CHANNELS];
  96
  97     /* Gain control, which applies to all input channels to a single (mono)
  98      * output buffer. */
  99     MixGains Gain;
 100 } SendParams;
 101
 102
 103 typedef const ALfloat* (*ResamplerFunc)(const ALfloat *src, ALuint frac, ALuint increment,
 104                                         ALfloat *restrict dst, ALuint dstlen);
 105
 106 typedef void (*MixerFunc)(const ALfloat *data, ALuint OutChans,
 107                           ALfloat (*restrict OutBuffer)[BUFFERSIZE], struct MixGains *Gains,
 108                           ALuint Counter, ALuint OutPos, ALuint BufferSize);
 109 typedef void (*HrtfMixerFunc)(ALfloat (*restrict OutBuffer)[BUFFERSIZE], const ALfloat *data,
 110                               ALuint Counter, ALuint Offset, ALuint OutPos,
 111                               const ALuint IrSize, const HrtfParams *hrtfparams,
 112                               HrtfState *hrtfstate, ALuint BufferSize);
 113
 114
 115 #define GAIN_SILENCE_THRESHOLD  (0.00001f) /* -100dB */
 116
 117 #define SPEEDOFSOUNDMETRESPERSEC  (343.3f)
 118 #define AIRABSORBGAINHF           (0.99426f) /* -0.05dB */
 119
 120 #define FRACTIONBITS (14)
 121 #define FRACTIONONE  (1<<FRACTIONBITS)
 122 #define FRACTIONMASK (FRACTIONONE-1)
 123
 124
 125 inline ALfloat minf(ALfloat a, ALfloat b)
 126 { return ((a > b) ? b : a); }
 127 inline ALfloat maxf(ALfloat a, ALfloat b)
 128 { return ((a > b) ? a : b); }
 129 inline ALfloat clampf(ALfloat val, ALfloat min, ALfloat max)
 130 { return minf(max, maxf(min, val)); }
 131
 132 inline ALdouble mind(ALdouble a, ALdouble b)
 133 { return ((a > b) ? b : a); }
 134 inline ALdouble maxd(ALdouble a, ALdouble b)
 135 { return ((a > b) ? a : b); }
 136 inline ALdouble clampd(ALdouble val, ALdouble min, ALdouble max)
 137 { return mind(max, maxd(min, val)); }
 138
 139 inline ALuint minu(ALuint a, ALuint b)
 140 { return ((a > b) ? b : a); }
 141 inline ALuint maxu(ALuint a, ALuint b)
 142 { return ((a > b) ? a : b); }
 143 inline ALuint clampu(ALuint val, ALuint min, ALuint max)
 144 { return minu(max, maxu(min, val)); }
 145
 146 inline ALint mini(ALint a, ALint b)
 147 { return ((a > b) ? b : a); }
 148 inline ALint maxi(ALint a, ALint b)
 149 { return ((a > b) ? a : b); }
 150 inline ALint clampi(ALint val, ALint min, ALint max)
 151 { return mini(max, maxi(min, val)); }
 152
 153 inline ALint64 mini64(ALint64 a, ALint64 b)
 154 { return ((a > b) ? b : a); }
 155 inline ALint64 maxi64(ALint64 a, ALint64 b)
 156 { return ((a > b) ? a : b); }
 157 inline ALint64 clampi64(ALint64 val, ALint64 min, ALint64 max)
 158 { return mini64(max, maxi64(min, val)); }
 159
 160 inline ALuint64 minu64(ALuint64 a, ALuint64 b)
 161 { return ((a > b) ? b : a); }
 162 inline ALuint64 maxu64(ALuint64 a, ALuint64 b)
 163 { return ((a > b) ? a : b); }
 164 inline ALuint64 clampu64(ALuint64 val, ALuint64 min, ALuint64 max)
 165 { return minu64(max, maxu64(min, val)); }
 166
 167
 168 inline ALfloat lerp(ALfloat val1, ALfloat val2, ALfloat mu)
 169 {
 170     return val1 + (val2-val1)*mu;
 171 }
 172 inline ALfloat cubic(ALfloat val0, ALfloat val1, ALfloat val2, ALfloat val3, ALfloat mu)
 173 {
 174     ALfloat mu2 = mu*mu;
 175     ALfloat a0 = -0.5f*val0 +  1.5f*val1 + -1.5f*val2 +  0.5f*val3;
 176     ALfloat a1 =       val0 + -2.5f*val1 +  2.0f*val2 + -0.5f*val3;
 177     ALfloat a2 = -0.5f*val0              +  0.5f*val2;
 178     ALfloat a3 =                    val1;
 179
 180     return a0*mu*mu2 + a1*mu2 + a2*mu + a3;
 181 }
 182
 183
 184 ALvoid aluInitPanning(ALCdevice *Device);
 185
 186 /**
 187  * ComputeDirectionalGains
 188  *
 189  * Sets channel gains based on a direction. The direction must be a 3-component
 190  * vector no longer than 1 unit.
 191  */
 192 void ComputeDirectionalGains(const ALCdevice *device, const ALfloat dir[3], ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS]);
 193
 194 /**
 195  * ComputeAngleGains
 196  *
 197  * Sets channel gains based on angle and elevation. The angle and elevation
 198  * parameters are in radians, going right and up respectively.
 199  */
 200 void ComputeAngleGains(const ALCdevice *device, ALfloat angle, ALfloat elevation, ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS]);
 201
 202 /**
 203  * ComputeAmbientGains
 204  *
 205  * Sets channel gains for ambient, omni-directional sounds.
 206  */
 207 void ComputeAmbientGains(const ALCdevice *device, ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS]);
 208
 209 /**
 210  * ComputeBFormatGains
 211  *
 212  * Sets channel gains for a given (first-order) B-Format channel. The matrix is
 213  * a 1x4 'slice' of the rotation matrix for a given channel used to orient the
 214  * coefficients.
 215  */
 216 void ComputeBFormatGains(const ALCdevice *device, const ALfloat mtx[4], ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS]);
 217
 218
 219 ALvoid CalcSourceParams(struct ALvoice *voice, const struct ALsource *source, const ALCcontext *ALContext);
 220 ALvoid CalcNonAttnSourceParams(struct ALvoice *voice, const struct ALsource *source, const ALCcontext *ALContext);
 221
 222 ALvoid MixSource(struct ALvoice *voice, struct ALsource *source, ALCdevice *Device, ALuint SamplesToDo);
 223
 224 ALvoid aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size);
 225 /* Caller must lock the device. */
 226 ALvoid aluHandleDisconnect(ALCdevice *device);
 227
 228 extern ALfloat ConeScale;
 229 extern ALfloat ZScale;
 230
 231 #ifdef __cplusplus
 232 }
 233 #endif
 234
 235 #endif
 236