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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
struct ALsource;
struct ALbuffer;
typedef ALvoid (*MixerFunc)(struct ALsource *self, ALCdevice *Device,
const ALvoid *RESTRICT data,
ALuint *DataPosInt, ALuint *DataPosFrac,
ALuint OutPos, ALuint SamplesToDo,
ALuint BufferSize);
typedef enum {
POINT_RESAMPLER = 0,
LINEAR_RESAMPLER,
CUBIC_RESAMPLER,
RESAMPLER_MAX,
RESAMPLER_MIN = -1,
RESAMPLER_DEFAULT = LINEAR_RESAMPLER
} resampler_t;
typedef enum {
FRONT_LEFT = 0,
FRONT_RIGHT,
FRONT_CENTER,
LFE,
BACK_LEFT,
BACK_RIGHT,
BACK_CENTER,
SIDE_LEFT,
SIDE_RIGHT,
MAXCHANNELS
} Channel;
#define BUFFERSIZE 4096
#define FRACTIONBITS (14)
#define FRACTIONONE (1<<FRACTIONBITS)
#define FRACTIONMASK (FRACTIONONE-1)
/* Size for temporary stack storage of buffer data. Larger values need more
* stack, while smaller values may need more iterations. The value needs to be
* a sensible size, however, as it constrains the max stepping value used for
* mixing.
* The mixer requires being able to do two samplings per mixing loop. A 16KB
* buffer can hold 512 sample frames for a 7.1 float buffer. With the cubic
* resampler (which requires 3 padding sample frames), this limits the maximum
* step to about 508. This means that buffer_freq*source_pitch cannot exceed
* device_freq*508 for an 8-channel 32-bit buffer. */
#ifndef STACK_DATA_SIZE
#define STACK_DATA_SIZE 16384
#endif
static __inline ALdouble lerp(ALdouble val1, ALdouble val2, ALdouble mu)
{
return val1 + (val2-val1)*mu;
}
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;
}
ALvoid aluInitPanning(ALCdevice *Device);
ALint aluCart2LUTpos(ALfloat re, ALfloat im);
ALvoid CalcSourceParams(struct ALsource *ALSource, const ALCcontext *ALContext);
ALvoid CalcNonAttnSourceParams(struct ALsource *ALSource, const ALCcontext *ALContext);
MixerFunc SelectMixer(struct ALbuffer *Buffer, resampler_t Resampler);
MixerFunc SelectHrtfMixer(struct ALbuffer *Buffer, resampler_t Resampler);
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
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