diff options
| author | Chris Robinson <[email protected]> | 2008-07-25 19:31:12 -0700 |
|---|---|---|
| committer | Chris Robinson <[email protected]> | 2008-07-25 19:31:12 -0700 |
| commit | c7e49c9f5735df52d4e847529ae9cb23027547e7 (patch) | |
| tree | 91f78fed57422925b198ed2f20e2ba44b4dbf242 /OpenAL32/Include | |
| parent | e2ed8ff2bfd1521f849038c400c054b0b6e8a5b0 (diff) | |
Implement yet another low-pass filter
This one using the Butterworth IIR filter design
Diffstat (limited to 'OpenAL32/Include')
| -rw-r--r-- | OpenAL32/Include/alAuxEffectSlot.h | 6 | ||||
| -rw-r--r-- | OpenAL32/Include/alFilter.h | 8 | ||||
| -rw-r--r-- | OpenAL32/Include/alSource.h | 2 |
3 files changed, 14 insertions, 2 deletions
diff --git a/OpenAL32/Include/alAuxEffectSlot.h b/OpenAL32/Include/alAuxEffectSlot.h index d4cb0d11..9bae788d 100644 --- a/OpenAL32/Include/alAuxEffectSlot.h +++ b/OpenAL32/Include/alAuxEffectSlot.h @@ -1,8 +1,9 @@ #ifndef _AL_AUXEFFECTSLOT_H_ #define _AL_AUXEFFECTSLOT_H_ -#include "alEffect.h" #include "AL/al.h" +#include "alEffect.h" +#include "alFilter.h" #ifdef __cplusplus extern "C" { @@ -28,7 +29,8 @@ typedef struct ALeffectslot ALuint ReverbReflectPos; ALuint ReverbLatePos; ALfloat ReverbDecayGain; - ALfloat LastDecaySample; + + FILTER iirFilter; ALuint refcount; diff --git a/OpenAL32/Include/alFilter.h b/OpenAL32/Include/alFilter.h index 038304e8..f1d24d0f 100644 --- a/OpenAL32/Include/alFilter.h +++ b/OpenAL32/Include/alFilter.h @@ -7,6 +7,11 @@ extern "C" { #endif +typedef struct { + float *history; /* pointer to history in filter */ + float *coef; /* pointer to coefficients of filter */ +} FILTER; + #define AL_FILTER_TYPE 0x8001 #define AL_FILTER_NULL 0x0000 @@ -48,6 +53,9 @@ AL_API ALvoid AL_APIENTRY alGetFilterfv(ALuint filter, ALenum param, ALfloat *pf ALvoid ReleaseALFilters(ALvoid); +float lpFilter(FILTER *iir, float input); +int InitLowPassFilter(ALCcontext *Context, FILTER *iir); + #ifdef __cplusplus } #endif diff --git a/OpenAL32/Include/alSource.h b/OpenAL32/Include/alSource.h index 1d3fc57c..73b02609 100644 --- a/OpenAL32/Include/alSource.h +++ b/OpenAL32/Include/alSource.h @@ -75,6 +75,8 @@ typedef struct ALsource ALboolean WetGainHFAuto; ALfloat OuterGainHF; + FILTER iirFilter; + ALfloat AirAbsorptionFactor; ALfloat RoomRolloffFactor; |