Make the filter functions global inline, and use it for echo

1 files changed, 33 insertions, 0 deletions

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