Add a panning "deadzone" for spatialized sources

It is now the greater of 'epsilon' (1 / 2**23) or ref_distance/1024.

2 files changed, 4 insertions, 3 deletions

diff --git a/alc/alu.cpp b/alc/alu.cpp
index 0cbfefec..a29c2833 100644
--- a/alc/alu.cpp
+++ b/alc/alu.cpp
@@ -1323,7 +1323,7 @@ void CalcAttnSourceParams(Voice *voice, const VoiceProps *props, const ALCcontex
 
     const bool directional{Direction.normalize() > 0.0f};
     alu::Vector ToSource{Position[0], Position[1], Position[2], 0.0f};
-    const float Distance{ToSource.normalize()};
+    const float Distance{ToSource.normalize(props->RefDistance / 1024.0f)};
 
     /* Initial source gain */
     GainTriplet DryGain{props->Gain, 1.0f, 1.0f};
diff --git a/common/vecmat.h b/common/vecmat.h
index d301cc30..997b535b 100644
--- a/common/vecmat.h
+++ b/common/vecmat.h
@@ -35,10 +35,11 @@ public:
         return *this;
     }
 
-    T normalize()
+    T normalize(T lim = std::numeric_limits<T>::epsilon())
     {
+        lim = std::max(lim, std::numeric_limits<T>::epsilon());
         const T length{std::sqrt(mVals[0]*mVals[0] + mVals[1]*mVals[1] + mVals[2]*mVals[2])};
-        if(length > std::numeric_limits<T>::epsilon())
+        if(length > lim)
         {
             T inv_length{T{1}/length};
             mVals[0] *= inv_length;