diff options
| -rw-r--r-- | OpenAL32/Include/alFilter.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/OpenAL32/Include/alFilter.h b/OpenAL32/Include/alFilter.h index 86ada5ef..754b0b6f 100644 --- a/OpenAL32/Include/alFilter.h +++ b/OpenAL32/Include/alFilter.h @@ -49,6 +49,18 @@ static __inline ALfloat lpFilter2P(FILTER *iir, ALuint offset, ALfloat input) return output; } +static __inline ALfloat lpFilter1P(FILTER *iir, ALuint offset, ALfloat input) +{ + ALfloat *history = &iir->history[offset]; + ALfloat a = iir->coeff; + ALfloat output = input; + + output = output + (history[0]-output)*a; + history[0] = output; + + return output; +} + #define AL_FILTER_TYPE 0x8001 |