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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 8192
#define FRACTIONBITS (14)
#define FRACTIONMASK ((1<<FRACTIONBITS)-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;
}
struct ALsource;
ALvoid aluInitPanning(ALCdevice *Device);
ALvoid CalcSourceParams(struct ALsource *ALSource, const ALCcontext *ALContext);
ALvoid CalcNonAttnSourceParams(struct ALsource *ALSource, const ALCcontext *ALContext);
ALvoid aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size);
ALvoid aluHandleDisconnect(ALCdevice *device);
#ifdef __cplusplus
}
#endif
#endif
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