From 1bfa7609d2b27e6ec5928268856a3496723bdeef Mon Sep 17 00:00:00 2001 From: Chris Robinson Date: Sat, 16 May 2009 23:34:26 -0700 Subject: Make the filter functions global inline, and use it for echo --- OpenAL32/Include/alFilter.h | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) (limited to 'OpenAL32/Include') diff --git a/OpenAL32/Include/alFilter.h b/OpenAL32/Include/alFilter.h index 40fff4fd..c0a05d6a 100644 --- a/OpenAL32/Include/alFilter.h +++ b/OpenAL32/Include/alFilter.h @@ -13,6 +13,39 @@ typedef struct { ALfloat history[0]; } FILTER; +static __inline ALfloat lpFilter4P(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; + output = output + (history[1]-output)*a; + history[1] = output; + output = output + (history[2]-output)*a; + history[2] = output; + output = output + (history[3]-output)*a; + history[3] = output; + + return output; +} + +static __inline ALfloat lpFilter2P(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; + output = output + (history[1]-output)*a; + history[1] = output; + + return output; +} + + #define AL_FILTER_TYPE 0x8001 #define AL_FILTER_NULL 0x0000 -- cgit v1.2.3