186 lines
4.0 KiB
C
186 lines
4.0 KiB
C
#ifndef _ALU_H_
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#define _ALU_H_
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#include "AL/al.h"
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#include "AL/alc.h"
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#include "AL/alext.h"
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#include <math.h>
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#ifdef HAVE_FLOAT_H
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#include <float.h>
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#endif
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#ifndef M_PI
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#define M_PI 3.14159265358979323846 /* pi */
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#define M_PI_2 1.57079632679489661923 /* pi/2 */
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#endif
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#ifdef HAVE_POWF
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#define aluPow(x,y) ((ALfloat)powf((float)(x),(float)(y)))
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#else
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#define aluPow(x,y) ((ALfloat)pow((double)(x),(double)(y)))
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#endif
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#ifdef HAVE_SQRTF
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#define aluSqrt(x) ((ALfloat)sqrtf((float)(x)))
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#else
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#define aluSqrt(x) ((ALfloat)sqrt((double)(x)))
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#endif
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#ifdef HAVE_ACOSF
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#define aluAcos(x) ((ALfloat)acosf((float)(x)))
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#else
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#define aluAcos(x) ((ALfloat)acos((double)(x)))
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#endif
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#ifdef HAVE_ATANF
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#define aluAtan(x) ((ALfloat)atanf((float)(x)))
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#else
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#define aluAtan(x) ((ALfloat)atan((double)(x)))
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#endif
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#ifdef HAVE_FABSF
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#define aluFabs(x) ((ALfloat)fabsf((float)(x)))
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#else
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#define aluFabs(x) ((ALfloat)fabs((double)(x)))
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#endif
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// fixes for mingw32.
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#if defined(max) && !defined(__max)
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#define __max max
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#endif
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#if defined(min) && !defined(__min)
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#define __min min
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#endif
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#define QUADRANT_NUM 128
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#define LUT_NUM (4 * QUADRANT_NUM)
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef enum {
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FRONT_LEFT = 0,
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FRONT_RIGHT,
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FRONT_CENTER,
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LFE,
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BACK_LEFT,
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BACK_RIGHT,
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BACK_CENTER,
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SIDE_LEFT,
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SIDE_RIGHT,
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OUTPUTCHANNELS
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} Channel;
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#define BUFFERSIZE 16384
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/* NOTE: The AL_FORMAT_REAR* enums aren't handled here be cause they're
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* converted to AL_FORMAT_QUAD* when loaded */
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static __inline ALuint aluBytesFromFormat(ALenum format)
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{
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switch(format)
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{
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case AL_FORMAT_MONO8:
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case AL_FORMAT_STEREO8:
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case AL_FORMAT_QUAD8_LOKI:
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case AL_FORMAT_QUAD8:
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case AL_FORMAT_51CHN8:
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case AL_FORMAT_61CHN8:
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case AL_FORMAT_71CHN8:
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return 1;
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case AL_FORMAT_MONO16:
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case AL_FORMAT_STEREO16:
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case AL_FORMAT_QUAD16_LOKI:
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case AL_FORMAT_QUAD16:
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case AL_FORMAT_51CHN16:
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case AL_FORMAT_61CHN16:
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case AL_FORMAT_71CHN16:
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return 2;
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case AL_FORMAT_MONO_FLOAT32:
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case AL_FORMAT_STEREO_FLOAT32:
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case AL_FORMAT_QUAD32:
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case AL_FORMAT_51CHN32:
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case AL_FORMAT_61CHN32:
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case AL_FORMAT_71CHN32:
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return 4;
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case AL_FORMAT_MONO_DOUBLE_EXT:
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case AL_FORMAT_STEREO_DOUBLE_EXT:
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return 8;
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default:
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return 0;
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}
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}
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static __inline ALuint aluChannelsFromFormat(ALenum format)
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{
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switch(format)
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{
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case AL_FORMAT_MONO8:
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case AL_FORMAT_MONO16:
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case AL_FORMAT_MONO_FLOAT32:
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case AL_FORMAT_MONO_DOUBLE_EXT:
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return 1;
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case AL_FORMAT_STEREO8:
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case AL_FORMAT_STEREO16:
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case AL_FORMAT_STEREO_FLOAT32:
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case AL_FORMAT_STEREO_DOUBLE_EXT:
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return 2;
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case AL_FORMAT_QUAD8_LOKI:
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case AL_FORMAT_QUAD16_LOKI:
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case AL_FORMAT_QUAD8:
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case AL_FORMAT_QUAD16:
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case AL_FORMAT_QUAD32:
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return 4;
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case AL_FORMAT_51CHN8:
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case AL_FORMAT_51CHN16:
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case AL_FORMAT_51CHN32:
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return 6;
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case AL_FORMAT_61CHN8:
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case AL_FORMAT_61CHN16:
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case AL_FORMAT_61CHN32:
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return 7;
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case AL_FORMAT_71CHN8:
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case AL_FORMAT_71CHN16:
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case AL_FORMAT_71CHN32:
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return 8;
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default:
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return 0;
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}
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}
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static __inline ALint aluCart2LUTpos(ALfloat re, ALfloat im)
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{
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ALint pos = 0;
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ALfloat denom = aluFabs(re) + aluFabs(im);
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if(denom > 0.0f)
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pos = (ALint)(QUADRANT_NUM*aluFabs(im) / denom + 0.5);
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if(re < 0.0)
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pos = 2 * QUADRANT_NUM - pos;
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if(im < 0.0)
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pos = LUT_NUM - pos;
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return pos%LUT_NUM;
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}
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ALvoid aluInitPanning(ALCdevice *Device);
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ALvoid aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size);
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ALvoid aluHandleDisconnect(ALCdevice *device);
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#ifdef __cplusplus
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}
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#endif
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#endif
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