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