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#ifndef _ALU_H_
#define _ALU_H_
#include <limits.h>
#include <math.h>
#ifdef HAVE_FLOAT_H
#include <float.h>
#endif
#ifdef HAVE_IEEEFP_H
#include <ieeefp.h>
#endif
#include "alMain.h"
#include "alBuffer.h"
#include "alFilter.h"
#include "hrtf.h"
#include "align.h"
#define F_PI (3.14159265358979323846f)
#define F_PI_2 (1.57079632679489661923f)
#define F_2PI (6.28318530717958647692f)
#ifndef FLT_EPSILON
#define FLT_EPSILON (1.19209290e-07f)
#endif
#define DEG2RAD(x) ((ALfloat)(x) * (F_PI/180.0f))
#define RAD2DEG(x) ((ALfloat)(x) * (180.0f/F_PI))
#define MAX_PITCH (10)
#ifdef __cplusplus
extern "C" {
#endif
struct ALsource;
struct ALvoice;
enum ActiveFilters {
AF_None = 0,
AF_LowPass = 1,
AF_HighPass = 2,
AF_BandPass = AF_LowPass | AF_HighPass
};
typedef struct MixGains {
ALfloat Current;
ALfloat Step;
ALfloat Target;
} MixGains;
typedef struct DirectParams {
ALfloat (*OutBuffer)[BUFFERSIZE];
ALuint OutChannels;
/* If not 'moving', gain/coefficients are set directly without fading. */
ALboolean Moving;
/* Stepping counter for gain/coefficient fading. */
ALuint Counter;
/* Last direction (relative to listener) and gain of a moving source. */
ALfloat LastDir[3];
ALfloat LastGain;
struct {
enum ActiveFilters ActiveType;
ALfilterState LowPass;
ALfilterState HighPass;
} Filters[MAX_INPUT_CHANNELS];
struct {
HrtfParams Params[MAX_INPUT_CHANNELS];
HrtfState State[MAX_INPUT_CHANNELS];
} Hrtf;
MixGains Gains[MAX_INPUT_CHANNELS][MAX_OUTPUT_CHANNELS];
} DirectParams;
typedef struct SendParams {
ALfloat (*OutBuffer)[BUFFERSIZE];
ALboolean Moving;
ALuint Counter;
struct {
enum ActiveFilters ActiveType;
ALfilterState LowPass;
ALfilterState HighPass;
} Filters[MAX_INPUT_CHANNELS];
/* Gain control, which applies to all input channels to a single (mono)
* output buffer. */
MixGains Gain;
} SendParams;
typedef const ALfloat* (*ResamplerFunc)(const ALfloat *src, ALuint frac, ALuint increment,
ALfloat *restrict dst, ALuint dstlen);
typedef void (*MixerFunc)(const ALfloat *data, ALuint OutChans,
ALfloat (*restrict OutBuffer)[BUFFERSIZE], struct MixGains *Gains,
ALuint Counter, ALuint OutPos, ALuint BufferSize);
typedef void (*HrtfMixerFunc)(ALfloat (*restrict OutBuffer)[BUFFERSIZE], const ALfloat *data,
ALuint Counter, ALuint Offset, ALuint OutPos,
const ALuint IrSize, const HrtfParams *hrtfparams,
HrtfState *hrtfstate, ALuint BufferSize);
#define GAIN_SILENCE_THRESHOLD (0.00001f) /* -100dB */
#define SPEEDOFSOUNDMETRESPERSEC (343.3f)
#define AIRABSORBGAINHF (0.99426f) /* -0.05dB */
#define FRACTIONBITS (12)
#define FRACTIONONE (1<<FRACTIONBITS)
#define FRACTIONMASK (FRACTIONONE-1)
inline ALfloat minf(ALfloat a, ALfloat b)
{ return ((a > b) ? b : a); }
inline ALfloat maxf(ALfloat a, ALfloat b)
{ return ((a > b) ? a : b); }
inline ALfloat clampf(ALfloat val, ALfloat min, ALfloat max)
{ return minf(max, maxf(min, val)); }
inline ALdouble mind(ALdouble a, ALdouble b)
{ return ((a > b) ? b : a); }
inline ALdouble maxd(ALdouble a, ALdouble b)
{ return ((a > b) ? a : b); }
inline ALdouble clampd(ALdouble val, ALdouble min, ALdouble max)
{ return mind(max, maxd(min, val)); }
inline ALuint minu(ALuint a, ALuint b)
{ return ((a > b) ? b : a); }
inline ALuint maxu(ALuint a, ALuint b)
{ return ((a > b) ? a : b); }
inline ALuint clampu(ALuint val, ALuint min, ALuint max)
{ return minu(max, maxu(min, val)); }
inline ALint mini(ALint a, ALint b)
{ return ((a > b) ? b : a); }
inline ALint maxi(ALint a, ALint b)
{ return ((a > b) ? a : b); }
inline ALint clampi(ALint val, ALint min, ALint max)
{ return mini(max, maxi(min, val)); }
inline ALint64 mini64(ALint64 a, ALint64 b)
{ return ((a > b) ? b : a); }
inline ALint64 maxi64(ALint64 a, ALint64 b)
{ return ((a > b) ? a : b); }
inline ALint64 clampi64(ALint64 val, ALint64 min, ALint64 max)
{ return mini64(max, maxi64(min, val)); }
inline ALuint64 minu64(ALuint64 a, ALuint64 b)
{ return ((a > b) ? b : a); }
inline ALuint64 maxu64(ALuint64 a, ALuint64 b)
{ return ((a > b) ? a : b); }
inline ALuint64 clampu64(ALuint64 val, ALuint64 min, ALuint64 max)
{ return minu64(max, maxu64(min, val)); }
extern ALfloat CubicLUT[FRACTIONONE][4];
inline ALfloat lerp(ALfloat val1, ALfloat val2, ALfloat mu)
{
return val1 + (val2-val1)*mu;
}
inline ALfloat cubic(ALfloat val0, ALfloat val1, ALfloat val2, ALfloat val3, ALuint frac)
{
const ALfloat *k = CubicLUT[frac];
return k[0]*val0 + k[1]*val1 + k[2]*val2 + k[3]*val3;
}
void aluInitResamplers(void);
ALvoid aluInitPanning(ALCdevice *Device);
/**
* ComputeDirectionalGains
*
* Sets channel gains based on a direction. The direction must be a 3-component
* vector no longer than 1 unit.
*/
void ComputeDirectionalGains(const ALCdevice *device, const ALfloat dir[3], ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS]);
/**
* ComputeAngleGains
*
* Sets channel gains based on angle and elevation. The angle and elevation
* parameters are in radians, going right and up respectively.
*/
void ComputeAngleGains(const ALCdevice *device, ALfloat angle, ALfloat elevation, ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS]);
/**
* ComputeAmbientGains
*
* Sets channel gains for ambient, omni-directional sounds.
*/
void ComputeAmbientGains(const ALCdevice *device, ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS]);
/**
* ComputeBFormatGains
*
* Sets channel gains for a given (first-order) B-Format channel. The matrix is
* a 1x4 'slice' of the rotation matrix for a given channel used to orient the
* coefficients.
*/
void ComputeBFormatGains(const ALCdevice *device, const ALfloat mtx[4], ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS]);
ALvoid CalcSourceParams(struct ALvoice *voice, const struct ALsource *source, const ALCcontext *ALContext);
ALvoid CalcNonAttnSourceParams(struct ALvoice *voice, const struct ALsource *source, const ALCcontext *ALContext);
ALvoid MixSource(struct ALvoice *voice, struct ALsource *source, ALCdevice *Device, ALuint SamplesToDo);
ALvoid aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size);
/* Caller must lock the device. */
ALvoid aluHandleDisconnect(ALCdevice *device);
extern ALfloat ConeScale;
extern ALfloat ZScale;
#ifdef __cplusplus
}
#endif
#endif
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