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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
#ifdef HAVE_IEEEFP_H
#include <ieeefp.h>
#endif
#define F_PI (3.14159265358979323846f) /* pi */
#define F_PI_2 (1.57079632679489661923f) /* pi/2 */
#ifndef HAVE_POWF
static __inline float powf(float x, float y)
{ return (float)pow(x, y); }
#endif
#ifndef HAVE_SQRTF
static __inline float sqrtf(float x)
{ return (float)sqrt(x); }
#endif
#ifndef HAVE_COSF
static __inline float cosf(float x)
{ return (float)cos(x); }
#endif
#ifndef HAVE_SINF
static __inline float sinf(float x)
{ return (float)sin(x); }
#endif
#ifndef HAVE_ACOSF
static __inline float acosf(float x)
{ return (float)acos(x); }
#endif
#ifndef HAVE_ASINF
static __inline float asinf(float x)
{ return (float)asin(x); }
#endif
#ifndef HAVE_ATANF
static __inline float atanf(float x)
{ return (float)atan(x); }
#endif
#ifndef HAVE_ATAN2F
static __inline float atan2f(float x, float y)
{ return (float)atan2(x, y); }
#endif
#ifndef HAVE_FABSF
static __inline float fabsf(float x)
{ return (float)fabs(x); }
#endif
#ifndef HAVE_LOG10F
static __inline float log10f(float x)
{ return (float)log10(x); }
#endif
#ifndef HAVE_FLOORF
static __inline float floorf(float x)
{ return (float)floor(x); }
#endif
#ifdef __cplusplus
extern "C" {
#endif
struct ALsource;
struct ALbuffer;
struct DirectParams;
struct SendParams;
typedef ALvoid (*DryMixerFunc)(struct ALsource *self, ALCdevice *Device,
struct DirectParams *params,
const ALfloat *RESTRICT data, ALuint srcchan,
ALuint OutPos, ALuint SamplesToDo,
ALuint BufferSize);
typedef ALvoid (*WetMixerFunc)(struct SendParams *params,
const ALfloat *RESTRICT data,
ALuint OutPos, ALuint SamplesToDo,
ALuint BufferSize);
enum Resampler {
PointResampler,
LinearResampler,
CubicResampler,
ResamplerMax,
};
enum Channel {
FrontLeft = 0,
FrontRight,
FrontCenter,
LFE,
BackLeft,
BackRight,
BackCenter,
SideLeft,
SideRight,
MaxChannels,
};
enum DistanceModel {
InverseDistanceClamped = AL_INVERSE_DISTANCE_CLAMPED,
LinearDistanceClamped = AL_LINEAR_DISTANCE_CLAMPED,
ExponentDistanceClamped = AL_EXPONENT_DISTANCE_CLAMPED,
InverseDistance = AL_INVERSE_DISTANCE,
LinearDistance = AL_LINEAR_DISTANCE,
ExponentDistance = AL_EXPONENT_DISTANCE,
DisableDistance = AL_NONE,
DefaultDistanceModel = InverseDistanceClamped
};
/* Size for temporary storage of buffer data, in ALfloats. 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, as well as the maximum number of samples per mixing iteration.
* 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 BUFFERSIZE
#define BUFFERSIZE 4096
#endif
#define FRACTIONBITS (14)
#define FRACTIONONE (1<<FRACTIONBITS)
#define FRACTIONMASK (FRACTIONONE-1)
static __inline ALfloat minf(ALfloat a, ALfloat b)
{ return ((a > b) ? b : a); }
static __inline ALfloat maxf(ALfloat a, ALfloat b)
{ return ((a > b) ? a : b); }
static __inline ALfloat clampf(ALfloat val, ALfloat min, ALfloat max)
{ return minf(max, maxf(min, val)); }
static __inline ALuint minu(ALuint a, ALuint b)
{ return ((a > b) ? b : a); }
static __inline ALuint maxu(ALuint a, ALuint b)
{ return ((a > b) ? a : b); }
static __inline ALuint clampu(ALuint val, ALuint min, ALuint max)
{ return minu(max, maxu(min, val)); }
static __inline ALint mini(ALint a, ALint b)
{ return ((a > b) ? b : a); }
static __inline ALint maxi(ALint a, ALint b)
{ return ((a > b) ? a : b); }
static __inline ALint clampi(ALint val, ALint min, ALint max)
{ return mini(max, maxi(min, val)); }
static __inline ALint64 mini64(ALint64 a, ALint64 b)
{ return ((a > b) ? b : a); }
static __inline ALint64 maxi64(ALint64 a, ALint64 b)
{ return ((a > b) ? a : b); }
static __inline ALint64 clampi64(ALint64 val, ALint64 min, ALint64 max)
{ return mini64(max, maxi64(min, val)); }
static __inline ALuint64 minu64(ALuint64 a, ALuint64 b)
{ return ((a > b) ? b : a); }
static __inline ALuint64 maxu64(ALuint64 a, ALuint64 b)
{ return ((a > b) ? a : b); }
static __inline ALuint64 clampu64(ALuint64 val, ALuint64 min, ALuint64 max)
{ return minu64(max, maxu64(min, val)); }
static __inline ALfloat lerp(ALfloat val1, ALfloat val2, ALfloat mu)
{
return val1 + (val2-val1)*mu;
}
static __inline ALfloat cubic(ALfloat val0, ALfloat val1, ALfloat val2, ALfloat val3, ALfloat mu)
{
ALfloat mu2 = mu*mu;
ALfloat a0 = -0.5f*val0 + 1.5f*val1 + -1.5f*val2 + 0.5f*val3;
ALfloat a1 = val0 + -2.5f*val1 + 2.0f*val2 + -0.5f*val3;
ALfloat a2 = -0.5f*val0 + 0.5f*val2;
ALfloat a3 = val1;
return a0*mu*mu2 + a1*mu2 + a2*mu + a3;
}
static __inline void aluCrossproduct(const ALfloat *inVector1, const ALfloat *inVector2, ALfloat *outVector)
{
outVector[0] = inVector1[1]*inVector2[2] - inVector1[2]*inVector2[1];
outVector[1] = inVector1[2]*inVector2[0] - inVector1[0]*inVector2[2];
outVector[2] = inVector1[0]*inVector2[1] - inVector1[1]*inVector2[0];
}
static __inline ALfloat aluDotproduct(const ALfloat *inVector1, const ALfloat *inVector2)
{
return inVector1[0]*inVector2[0] + inVector1[1]*inVector2[1] +
inVector1[2]*inVector2[2];
}
static __inline void aluNormalize(ALfloat *inVector)
{
ALfloat lengthsqr = aluDotproduct(inVector, inVector);
if(lengthsqr > 0.0f)
{
ALfloat inv_length = 1.0f/sqrtf(lengthsqr);
inVector[0] *= inv_length;
inVector[1] *= inv_length;
inVector[2] *= inv_length;
}
}
ALvoid aluInitPanning(ALCdevice *Device);
ALvoid ComputeAngleGains(const ALCdevice *device, ALfloat angle, ALfloat hwidth, ALfloat ingain, ALfloat *gains);
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);
extern ALfloat ConeScale;
extern ALfloat ZScale;
#ifdef __cplusplus
}
#endif
#endif
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