Make the filter history buffer size flexible

This lets the filter history buffer be as big as needed for a given use, so
that it can have a size large enough for the more demanding cases, but not be
wasteful for lesser-demanding cases, while not incuring the overhead of an
added pointer indirection

2 files changed, 3 insertions, 1 deletions

diff --git a/OpenAL32/Include/alFilter.h b/OpenAL32/Include/alFilter.h
index 413f2a12..40fff4fd 100644
--- a/OpenAL32/Include/alFilter.h
+++ b/OpenAL32/Include/alFilter.h
@@ -9,8 +9,8 @@ extern "C" {
 #endif
 
 typedef struct {
-    ALfloat history[OUTPUTCHANNELS*2];
     ALfloat coeff;
+    ALfloat history[0];
 } FILTER;
 
 #define AL_FILTER_TYPE                                     0x8001
diff --git a/OpenAL32/Include/alSource.h b/OpenAL32/Include/alSource.h
index 28a85029..2bd7aac2 100644
--- a/OpenAL32/Include/alSource.h
+++ b/OpenAL32/Include/alSource.h
@@ -69,6 +69,7 @@ typedef struct ALsource
         struct ALeffectslot *Slot;
         ALfilter WetFilter;
         FILTER iirFilter;
+        ALfloat history[2];
     } Send[MAX_SENDS];
 
     ALboolean DryGainHFAuto;
@@ -77,6 +78,7 @@ typedef struct ALsource
     ALfloat   OuterGainHF;
 
     FILTER iirFilter;
+    ALfloat history[OUTPUTCHANNELS*2];
 
     ALfloat AirAbsorptionFactor;