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 SRC_HISTORY_BITS   (6)
  34 #define SRC_HISTORY_LENGTH (1<<SRC_HISTORY_BITS)
  35 #define SRC_HISTORY_MASK   (SRC_HISTORY_LENGTH-1)
  36
  37 #define MAX_PITCH  (10)
  38
  39
  40 #ifdef __cplusplus
  41 extern "C" {
  42 #endif
  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 HrtfState {
  53     alignas(16) ALfloat History[SRC_HISTORY_LENGTH];
  54     alignas(16) ALfloat Values[HRIR_LENGTH][2];
  55 } HrtfState;
  56
  57 typedef struct HrtfParams {
  58     alignas(16) ALfloat Coeffs[HRIR_LENGTH][2];
  59     alignas(16) ALfloat CoeffStep[HRIR_LENGTH][2];
  60     ALuint Delay[2];
  61     ALint DelayStep[2];
  62 } HrtfParams;
  63
  64
  65 typedef struct MixGains {
  66     ALfloat Current;
  67     ALfloat Step;
  68     ALfloat Target;
  69 } MixGains;
  70
  71
  72 typedef struct DirectParams {
  73     ALfloat (*OutBuffer)[BUFFERSIZE];
  74
  75     /* If not 'moving', gain/coefficients are set directly without fading. */
  76     ALboolean Moving;
  77     /* Stepping counter for gain/coefficient fading. */
  78     ALuint Counter;
  79
  80     struct {
  81         enum ActiveFilters ActiveType;
  82         ALfilterState LowPass;
  83         ALfilterState HighPass;
  84     } Filters[MAX_INPUT_CHANNELS];
  85
  86     union {
  87         struct {
  88             HrtfParams Params[MAX_INPUT_CHANNELS];
  89             HrtfState State[MAX_INPUT_CHANNELS];
  90             ALuint IrSize;
  91             ALfloat Gain;
  92             ALfloat Dir[3];
  93         } Hrtf;
  94
  95         MixGains Gains[MAX_INPUT_CHANNELS][MaxChannels];
  96     } Mix;
  97 } DirectParams;
  98
  99 typedef struct SendParams {
 100     ALfloat (*OutBuffer)[BUFFERSIZE];
 101
 102     ALboolean Moving;
 103     ALuint Counter;
 104
 105     struct {
 106         enum ActiveFilters ActiveType;
 107         ALfilterState LowPass;
 108         ALfilterState HighPass;
 109     } Filters[MAX_INPUT_CHANNELS];
 110
 111     /* Gain control, which applies to all input channels to a single (mono)
 112      * output buffer. */
 113     MixGains Gain;
 114 } SendParams;
 115
 116
 117 typedef const ALfloat* (*ResamplerFunc)(const ALfloat *src, ALuint frac, ALuint increment,
 118                                         ALfloat *restrict dst, ALuint dstlen);
 119
 120 typedef void (*MixerFunc)(const ALfloat *data, ALuint OutChans,
 121                           ALfloat (*restrict OutBuffer)[BUFFERSIZE], struct MixGains *Gains,
 122                           ALuint Counter, ALuint OutPos, ALuint BufferSize);
 123 typedef void (*HrtfMixerFunc)(ALfloat (*restrict OutBuffer)[BUFFERSIZE], const ALfloat *data,
 124                               ALuint Counter, ALuint Offset, ALuint OutPos,
 125                               const ALuint IrSize, const HrtfParams *hrtfparams,
 126                               HrtfState *hrtfstate, ALuint BufferSize);
 127
 128
 129 #define GAIN_SILENCE_THRESHOLD  (0.00001f) /* -100dB */
 130
 131 #define SPEEDOFSOUNDMETRESPERSEC  (343.3f)
 132 #define AIRABSORBGAINHF           (0.99426f) /* -0.05dB */
 133
 134 #define FRACTIONBITS (14)
 135 #define FRACTIONONE  (1<<FRACTIONBITS)
 136 #define FRACTIONMASK (FRACTIONONE-1)
 137
 138
 139 inline ALfloat minf(ALfloat a, ALfloat b)
 140 { return ((a > b) ? b : a); }
 141 inline ALfloat maxf(ALfloat a, ALfloat b)
 142 { return ((a > b) ? a : b); }
 143 inline ALfloat clampf(ALfloat val, ALfloat min, ALfloat max)
 144 { return minf(max, maxf(min, val)); }
 145
 146 inline ALdouble mind(ALdouble a, ALdouble b)
 147 { return ((a > b) ? b : a); }
 148 inline ALdouble maxd(ALdouble a, ALdouble b)
 149 { return ((a > b) ? a : b); }
 150 inline ALdouble clampd(ALdouble val, ALdouble min, ALdouble max)
 151 { return mind(max, maxd(min, val)); }
 152
 153 inline ALuint minu(ALuint a, ALuint b)
 154 { return ((a > b) ? b : a); }
 155 inline ALuint maxu(ALuint a, ALuint b)
 156 { return ((a > b) ? a : b); }
 157 inline ALuint clampu(ALuint val, ALuint min, ALuint max)
 158 { return minu(max, maxu(min, val)); }
 159
 160 inline ALint mini(ALint a, ALint b)
 161 { return ((a > b) ? b : a); }
 162 inline ALint maxi(ALint a, ALint b)
 163 { return ((a > b) ? a : b); }
 164 inline ALint clampi(ALint val, ALint min, ALint max)
 165 { return mini(max, maxi(min, val)); }
 166
 167 inline ALint64 mini64(ALint64 a, ALint64 b)
 168 { return ((a > b) ? b : a); }
 169 inline ALint64 maxi64(ALint64 a, ALint64 b)
 170 { return ((a > b) ? a : b); }
 171 inline ALint64 clampi64(ALint64 val, ALint64 min, ALint64 max)
 172 { return mini64(max, maxi64(min, val)); }
 173
 174 inline ALuint64 minu64(ALuint64 a, ALuint64 b)
 175 { return ((a > b) ? b : a); }
 176 inline ALuint64 maxu64(ALuint64 a, ALuint64 b)
 177 { return ((a > b) ? a : b); }
 178 inline ALuint64 clampu64(ALuint64 val, ALuint64 min, ALuint64 max)
 179 { return minu64(max, maxu64(min, val)); }
 180
 181
 182 inline ALfloat lerp(ALfloat val1, ALfloat val2, ALfloat mu)
 183 {
 184     return val1 + (val2-val1)*mu;
 185 }
 186 inline ALfloat cubic(ALfloat val0, ALfloat val1, ALfloat val2, ALfloat val3, ALfloat mu)
 187 {
 188     ALfloat mu2 = mu*mu;
 189     ALfloat a0 = -0.5f*val0 +  1.5f*val1 + -1.5f*val2 +  0.5f*val3;
 190     ALfloat a1 =       val0 + -2.5f*val1 +  2.0f*val2 + -0.5f*val3;
 191     ALfloat a2 = -0.5f*val0              +  0.5f*val2;
 192     ALfloat a3 =                    val1;
 193
 194     return a0*mu*mu2 + a1*mu2 + a2*mu + a3;
 195 }
 196
 197
 198 ALvoid aluInitPanning(ALCdevice *Device);
 199
 200 /**
 201  * ComputeAngleGains
 202  *
 203  * Sets channel gains based on a given source's angle and its half-width. The
 204  * angle and hwidth parameters are in radians.
 205  */
 206 void ComputeAngleGains(const ALCdevice *device, ALfloat angle, ALfloat hwidth, ALfloat ingain, ALfloat gains[MaxChannels]);
 207
 208 /**
 209  * SetGains
 210  *
 211  * Helper to set the appropriate channels to the specified gain.
 212  */
 213 inline void SetGains(const ALCdevice *device, ALfloat ingain, ALfloat gains[MaxChannels])
 214 {
 215     ComputeAngleGains(device, 0.0f, F_PI, ingain, gains);
 216 }
 217
 218
 219 ALvoid CalcSourceParams(struct ALactivesource *src, const ALCcontext *ALContext);
 220 ALvoid CalcNonAttnSourceParams(struct ALactivesource *src, const ALCcontext *ALContext);
 221
 222 ALvoid MixSource(struct ALactivesource *src, 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