OpenAL32/Include/alFilter.h

   1 #ifndef _AL_FILTER_H_
   2 #define _AL_FILTER_H_
   3
   4 #include "AL/al.h"
   5
   6 #ifdef __cplusplus
   7 extern "C" {
   8 #endif
   9
  10 typedef struct {
  11     float history[2];  /* history in filter */
  12     float coef[4 + 1]; /* coefficients of filter */
  13 } FILTER;
  14
  15 #define AL_FILTER_TYPE                                     0x8001
  16
  17 #define AL_FILTER_NULL                                     0x0000
  18 #define AL_FILTER_LOWPASS                                  0x0001
  19 #define AL_FILTER_HIGHPASS                                 0x0002
  20 #define AL_FILTER_BANDPASS                                 0x0003
  21
  22 #define AL_LOWPASS_GAIN                                    0x0001
  23 #define AL_LOWPASS_GAINHF                                  0x0002
  24
  25
  26 typedef struct ALfilter_struct
  27 {
  28     // Filter type (AL_FILTER_NULL, ...)
  29     ALenum type;
  30
  31     ALfloat Gain;
  32     ALfloat GainHF;
  33
  34     // Index to itself
  35     ALuint filter;
  36
  37     struct ALfilter_struct *next;
  38 } ALfilter;
  39
  40 ALvoid AL_APIENTRY alGenFilters(ALsizei n, ALuint *filters);
  41 ALvoid AL_APIENTRY alDeleteFilters(ALsizei n, ALuint *filters);
  42 ALboolean AL_APIENTRY alIsFilter(ALuint filter);
  43
  44 ALvoid AL_APIENTRY alFilteri(ALuint filter, ALenum param, ALint iValue);
  45 ALvoid AL_APIENTRY alFilteriv(ALuint filter, ALenum param, ALint *piValues);
  46 ALvoid AL_APIENTRY alFilterf(ALuint filter, ALenum param, ALfloat flValue);
  47 ALvoid AL_APIENTRY alFilterfv(ALuint filter, ALenum param, ALfloat *pflValues);
  48
  49 ALvoid AL_APIENTRY alGetFilteri(ALuint filter, ALenum param, ALint *piValue);
  50 ALvoid AL_APIENTRY alGetFilteriv(ALuint filter, ALenum param, ALint *piValues);
  51 ALvoid AL_APIENTRY alGetFilterf(ALuint filter, ALenum param, ALfloat *pflValue);
  52 ALvoid AL_APIENTRY alGetFilterfv(ALuint filter, ALenum param, ALfloat *pflValues);
  53
  54 ALvoid ReleaseALFilters(ALvoid);
  55
  56 int InitLowPassFilter(ALCcontext *Context, FILTER *iir);
  57
  58 #ifdef __cplusplus
  59 }
  60 #endif
  61
  62 #endif