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#ifndef _ALU_H_
#define _ALU_H_

#include "AL/al.h"
#include "AL/alc.h"
#include "AL/alext.h"

#include <limits.h>
#include <math.h>
#ifdef HAVE_FLOAT_H
#include <float.h>
#endif

#ifndef M_PI
#define M_PI           3.14159265358979323846  /* pi */
#define M_PI_2         1.57079632679489661923  /* pi/2 */
#endif

#ifdef HAVE_POWF
#define aluPow(x,y) ((ALfloat)powf((float)(x),(float)(y)))
#else
#define aluPow(x,y) ((ALfloat)pow((double)(x),(double)(y)))
#endif

#ifdef HAVE_SQRTF
#define aluSqrt(x) ((ALfloat)sqrtf((float)(x)))
#else
#define aluSqrt(x) ((ALfloat)sqrt((double)(x)))
#endif

#ifdef HAVE_ACOSF
#define aluAcos(x) ((ALfloat)acosf((float)(x)))
#else
#define aluAcos(x) ((ALfloat)acos((double)(x)))
#endif

#ifdef HAVE_ATANF
#define aluAtan(x) ((ALfloat)atanf((float)(x)))
#else
#define aluAtan(x) ((ALfloat)atan((double)(x)))
#endif

#ifdef HAVE_FABSF
#define aluFabs(x) ((ALfloat)fabsf((float)(x)))
#else
#define aluFabs(x) ((ALfloat)fabs((double)(x)))
#endif

// fixes for mingw32.
#if defined(max) && !defined(__max)
#define __max max
#endif
#if defined(min) && !defined(__min)
#define __min min
#endif

#define QUADRANT_NUM  128
#define LUT_NUM       (4 * QUADRANT_NUM)

#ifdef __cplusplus
extern "C" {
#endif

typedef enum {
    FRONT_LEFT = 0,
    FRONT_RIGHT,
    FRONT_CENTER,
    LFE,
    BACK_LEFT,
    BACK_RIGHT,
    BACK_CENTER,
    SIDE_LEFT,
    SIDE_RIGHT,

    OUTPUTCHANNELS
} Channel;

#define BUFFERSIZE 4096

#define FRACTIONBITS (14)
#define FRACTIONONE  (1<<FRACTIONBITS)
#define FRACTIONMASK (FRACTIONONE-1)
#define MAX_PITCH    (INT_MAX & ~FRACTIONMASK)

/* NOTE: The AL_FORMAT_REAR* enums aren't handled here because they're
 *       converted to AL_FORMAT_QUAD* when loaded */
static __inline ALuint aluBytesFromFormat(ALenum format)
{
    switch(format)
    {
        case AL_FORMAT_MONO8:
        case AL_FORMAT_STEREO8:
        case AL_FORMAT_QUAD8_LOKI:
        case AL_FORMAT_QUAD8:
        case AL_FORMAT_51CHN8:
        case AL_FORMAT_61CHN8:
        case AL_FORMAT_71CHN8:
            return 1;

        case AL_FORMAT_MONO16:
        case AL_FORMAT_STEREO16:
        case AL_FORMAT_QUAD16_LOKI:
        case AL_FORMAT_QUAD16:
        case AL_FORMAT_51CHN16:
        case AL_FORMAT_61CHN16:
        case AL_FORMAT_71CHN16:
            return 2;

        case AL_FORMAT_MONO_FLOAT32:
        case AL_FORMAT_STEREO_FLOAT32:
        case AL_FORMAT_QUAD32:
        case AL_FORMAT_51CHN32:
        case AL_FORMAT_61CHN32:
        case AL_FORMAT_71CHN32:
            return 4;

        case AL_FORMAT_MONO_DOUBLE_EXT:
        case AL_FORMAT_STEREO_DOUBLE_EXT:
            return 8;

        default:
            return 0;
    }
}
static __inline ALuint aluChannelsFromFormat(ALenum format)
{
    switch(format)
    {
        case AL_FORMAT_MONO8:
        case AL_FORMAT_MONO16:
        case AL_FORMAT_MONO_FLOAT32:
        case AL_FORMAT_MONO_DOUBLE_EXT:
            return 1;

        case AL_FORMAT_STEREO8:
        case AL_FORMAT_STEREO16:
        case AL_FORMAT_STEREO_FLOAT32:
        case AL_FORMAT_STEREO_DOUBLE_EXT:
            return 2;

        case AL_FORMAT_QUAD8_LOKI:
        case AL_FORMAT_QUAD16_LOKI:
        case AL_FORMAT_QUAD8:
        case AL_FORMAT_QUAD16:
        case AL_FORMAT_QUAD32:
            return 4;

        case AL_FORMAT_51CHN8:
        case AL_FORMAT_51CHN16:
        case AL_FORMAT_51CHN32:
            return 6;

        case AL_FORMAT_61CHN8:
        case AL_FORMAT_61CHN16:
        case AL_FORMAT_61CHN32:
            return 7;

        case AL_FORMAT_71CHN8:
        case AL_FORMAT_71CHN16:
        case AL_FORMAT_71CHN32:
            return 8;

        default:
            return 0;
    }
}
static __inline ALuint aluFrameSizeFromFormat(ALenum format)
{
    return aluBytesFromFormat(format) * aluChannelsFromFormat(format);
}

static __inline ALint aluCart2LUTpos(ALfloat re, ALfloat im)
{
    ALint pos = 0;
    ALfloat denom = aluFabs(re) + aluFabs(im);
    if(denom > 0.0f)
        pos = (ALint)(QUADRANT_NUM*aluFabs(im) / denom + 0.5);

    if(re < 0.0)
        pos = 2 * QUADRANT_NUM - pos;
    if(im < 0.0)
        pos = LUT_NUM - pos;
    return pos%LUT_NUM;
}

static __inline ALdouble lerp(ALdouble val1, ALdouble val2, ALdouble mu)
{
    val1 += (val2-val1) * mu;
    return val1;
}
static __inline ALdouble cubic(ALdouble val0, ALdouble val1, ALdouble val2, ALdouble val3, ALdouble mu)
{
    ALdouble mu2 = mu*mu;
    ALdouble a0 = -0.5*val0 +  1.5*val1 + -1.5*val2 +  0.5*val3;
    ALdouble a1 =      val0 + -2.5*val1 +  2.0*val2 + -0.5*val3;
    ALdouble a2 = -0.5*val0             +  0.5*val2;
    ALdouble a3 =                  val1;

    return a0*mu*mu2 + a1*mu2 + a2*mu + a3;
}

struct ALsource;

ALvoid aluInitPanning(ALCdevice *Device);

ALvoid CalcSourceParams(struct ALsource *ALSource, const ALCcontext *ALContext);
ALvoid CalcNonAttnSourceParams(struct ALsource *ALSource, const ALCcontext *ALContext);

ALvoid MixSource(struct ALsource *Source, ALCdevice *Device, ALuint SamplesToDo);

ALvoid aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size);
ALvoid aluHandleDisconnect(ALCdevice *device);

#ifdef __cplusplus
}
#endif

#endif