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
  38 #ifdef __cplusplus
  39 extern "C" {
  40 #endif
  41
  42 enum ActiveFilters {
  43     AF_None = 0,
  44     AF_LowPass = 1,
  45     AF_HighPass = 2,
  46     AF_BandPass = AF_LowPass | AF_HighPass
  47 };
  48
  49
  50 typedef struct HrtfState {
  51     alignas(16) ALfloat History[SRC_HISTORY_LENGTH];
  52     alignas(16) ALfloat Values[HRIR_LENGTH][2];
  53 } HrtfState;
  54
  55 typedef struct HrtfParams {
  56     alignas(16) ALfloat Coeffs[HRIR_LENGTH][2];
  57     alignas(16) ALfloat CoeffStep[HRIR_LENGTH][2];
  58     ALuint Delay[2];
  59     ALint DelayStep[2];
  60 } HrtfParams;
  61
  62
  63 typedef struct MixGains {
  64     ALfloat Current[MaxChannels];
  65     ALfloat Step[MaxChannels];
  66     ALfloat Target[MaxChannels];
  67 } MixGains;
  68
  69 typedef struct MixGainMono {
  70     ALfloat Current;
  71     ALfloat Step;
  72     ALfloat Target;
  73 } MixGainMono;
  74
  75
  76 typedef struct DirectParams {
  77     ALfloat (*OutBuffer)[BUFFERSIZE];
  78
  79     /* If not 'moving', gain/coefficients are set directly without fading. */
  80     ALboolean Moving;
  81     /* Stepping counter for gain/coefficient fading. */
  82     ALuint Counter;
  83     /* History/coefficient offset. */
  84     ALuint Offset;
  85
  86     struct {
  87         enum ActiveFilters ActiveType;
  88         ALfilterState LowPass;
  89         ALfilterState HighPass;
  90     } Filters[MAX_INPUT_CHANNELS];
  91
  92     union {
  93         struct {
  94             HrtfParams Params[MAX_INPUT_CHANNELS];
  95             HrtfState State[MAX_INPUT_CHANNELS];
  96             ALuint IrSize;
  97             ALfloat Gain;
  98             ALfloat Dir[3];
  99         } Hrtf;
 100
 101         MixGains Gains[MAX_INPUT_CHANNELS];
 102     } Mix;
 103 } DirectParams;
 104
 105 typedef struct SendParams {
 106     ALfloat (*OutBuffer)[BUFFERSIZE];
 107
 108     ALboolean Moving;
 109     ALuint Counter;
 110
 111     struct {
 112         enum ActiveFilters ActiveType;
 113         ALfilterState LowPass;
 114         ALfilterState HighPass;
 115     } Filters[MAX_INPUT_CHANNELS];
 116
 117     /* Gain control, which applies to all input channels to a single (mono)
 118      * output buffer. */
 119     MixGainMono Gain;
 120 } SendParams;
 121
 122
 123 typedef const ALfloat* (*ResamplerFunc)(const ALfloat *src, ALuint frac, ALuint increment,
 124                                         ALfloat *restrict dst, ALuint dstlen);
 125
 126 typedef void (*DryMixerFunc)(ALfloat (*restrict OutBuffer)[BUFFERSIZE], const ALfloat *data,
 127                              MixGains *Gains, ALuint Counter, ALuint OutPos,
 128                              ALuint BufferSize);
 129 typedef void (*HrtfMixerFunc)(ALfloat (*restrict OutBuffer)[BUFFERSIZE], const ALfloat *data,
 130                               ALuint Counter, ALuint Offset, ALuint OutPos,
 131                               const ALuint IrSize, const HrtfParams *hrtfparams,
 132                               HrtfState *hrtfstate, ALuint BufferSize);
 133 typedef void (*WetMixerFunc)(ALfloat (*restrict OutBuffer)[BUFFERSIZE], const ALfloat *data,
 134                              MixGainMono *Gain, ALuint Counter, ALuint OutPos,
 135                              ALuint BufferSize);
 136
 137
 138 #define GAIN_SILENCE_THRESHOLD  (0.00001f) /* -100dB */
 139
 140 #define SPEEDOFSOUNDMETRESPERSEC  (343.3f)
 141 #define AIRABSORBGAINHF           (0.99426f) /* -0.05dB */
 142
 143 #define FRACTIONBITS (14)
 144 #define FRACTIONONE  (1<<FRACTIONBITS)
 145 #define FRACTIONMASK (FRACTIONONE-1)
 146
 147
 148 inline ALfloat minf(ALfloat a, ALfloat b)
 149 { return ((a > b) ? b : a); }
 150 inline ALfloat maxf(ALfloat a, ALfloat b)
 151 { return ((a > b) ? a : b); }
 152 inline ALfloat clampf(ALfloat val, ALfloat min, ALfloat max)
 153 { return minf(max, maxf(min, val)); }
 154
 155 inline ALdouble mind(ALdouble a, ALdouble b)
 156 { return ((a > b) ? b : a); }
 157 inline ALdouble maxd(ALdouble a, ALdouble b)
 158 { return ((a > b) ? a : b); }
 159 inline ALdouble clampd(ALdouble val, ALdouble min, ALdouble max)
 160 { return mind(max, maxd(min, val)); }
 161
 162 inline ALuint minu(ALuint a, ALuint b)
 163 { return ((a > b) ? b : a); }
 164 inline ALuint maxu(ALuint a, ALuint b)
 165 { return ((a > b) ? a : b); }
 166 inline ALuint clampu(ALuint val, ALuint min, ALuint max)
 167 { return minu(max, maxu(min, val)); }
 168
 169 inline ALint mini(ALint a, ALint b)
 170 { return ((a > b) ? b : a); }
 171 inline ALint maxi(ALint a, ALint b)
 172 { return ((a > b) ? a : b); }
 173 inline ALint clampi(ALint val, ALint min, ALint max)
 174 { return mini(max, maxi(min, val)); }
 175
 176 inline ALint64 mini64(ALint64 a, ALint64 b)
 177 { return ((a > b) ? b : a); }
 178 inline ALint64 maxi64(ALint64 a, ALint64 b)
 179 { return ((a > b) ? a : b); }
 180 inline ALint64 clampi64(ALint64 val, ALint64 min, ALint64 max)
 181 { return mini64(max, maxi64(min, val)); }
 182
 183 inline ALuint64 minu64(ALuint64 a, ALuint64 b)
 184 { return ((a > b) ? b : a); }
 185 inline ALuint64 maxu64(ALuint64 a, ALuint64 b)
 186 { return ((a > b) ? a : b); }
 187 inline ALuint64 clampu64(ALuint64 val, ALuint64 min, ALuint64 max)
 188 { return minu64(max, maxu64(min, val)); }
 189
 190
 191 inline ALfloat lerp(ALfloat val1, ALfloat val2, ALfloat mu)
 192 {
 193     return val1 + (val2-val1)*mu;
 194 }
 195 inline ALfloat cubic(ALfloat val0, ALfloat val1, ALfloat val2, ALfloat val3, ALfloat mu)
 196 {
 197     ALfloat mu2 = mu*mu;
 198     ALfloat a0 = -0.5f*val0 +  1.5f*val1 + -1.5f*val2 +  0.5f*val3;
 199     ALfloat a1 =       val0 + -2.5f*val1 +  2.0f*val2 + -0.5f*val3;
 200     ALfloat a2 = -0.5f*val0              +  0.5f*val2;
 201     ALfloat a3 =                    val1;
 202
 203     return a0*mu*mu2 + a1*mu2 + a2*mu + a3;
 204 }
 205
 206
 207 ALvoid aluInitPanning(ALCdevice *Device);
 208
 209 /**
 210  * ComputeAngleGains
 211  *
 212  * Sets channel gains based on a given source's angle and its half-width. The
 213  * angle and hwidth parameters are in radians.
 214  */
 215 void ComputeAngleGains(const ALCdevice *device, ALfloat angle, ALfloat hwidth, ALfloat ingain, ALfloat gains[MaxChannels]);
 216
 217 /**
 218  * SetGains
 219  *
 220  * Helper to set the appropriate channels to the specified gain.
 221  */
 222 inline void SetGains(const ALCdevice *device, ALfloat ingain, ALfloat gains[MaxChannels])
 223 {
 224     ComputeAngleGains(device, 0.0f, F_PI, ingain, gains);
 225 }
 226
 227
 228 ALvoid CalcSourceParams(struct ALactivesource *src, const ALCcontext *ALContext);
 229 ALvoid CalcNonAttnSourceParams(struct ALactivesource *src, const ALCcontext *ALContext);
 230
 231 ALvoid MixSource(struct ALactivesource *src, ALCdevice *Device, ALuint SamplesToDo);
 232
 233 ALvoid aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size);
 234 /* Caller must lock the device. */
 235 ALvoid aluHandleDisconnect(ALCdevice *device);
 236
 237 extern ALfloat ConeScale;
 238 extern ALfloat ZScale;
 239
 240 #ifdef __cplusplus
 241 }
 242 #endif
 243
 244 #endif
 245