5 files changed, 10 insertions, 14 deletions
diff --git a/alc/mixer/defs.h b/alc/mixer/defs.h
index 1e5b40d8..a3b49ad3 100644
--- a/alc/mixer/defs.h
+++ b/alc/mixer/defs.h
@@ -42,10 +42,10 @@ void MixRow_(const al::span<float> OutBuffer, const al::span<const float> Gains,
 
 template<InstSetType InstTag>
 void MixHrtf_(const float *InSamples, float2 *AccumSamples, const ALuint IrSize,
-    MixHrtfFilter *hrtfparams, const size_t BufferSize);
+    const MixHrtfFilter *hrtfparams, const size_t BufferSize);
 template<InstSetType InstTag>
 void MixHrtfBlend_(const float *InSamples, float2 *AccumSamples, const ALuint IrSize,
-    const HrtfFilter *oldparams, MixHrtfFilter *newparams, const size_t BufferSize);
+    const HrtfFilter *oldparams, const MixHrtfFilter *newparams, const size_t BufferSize);
 template<InstSetType InstTag>
 void MixDirectHrtf_(FloatBufferLine &LeftOut, FloatBufferLine &RightOut,
     const al::span<const FloatBufferLine> InSamples, float2 *AccumSamples, DirectHrtfState *State,
diff --git a/alc/mixer/hrtfbase.h b/alc/mixer/hrtfbase.h
index 942c56c3..ed40328c 100644
--- a/alc/mixer/hrtfbase.h
+++ b/alc/mixer/hrtfbase.h
@@ -14,7 +14,7 @@ using ApplyCoeffsT = void(&)(float2 *RESTRICT Values, const ALuint irSize, const
 
 template<ApplyCoeffsT ApplyCoeffs>
 inline void MixHrtfBase(const float *InSamples, float2 *RESTRICT AccumSamples, const ALuint IrSize,
-    MixHrtfFilter *hrtfparams, const size_t BufferSize)
+    const MixHrtfFilter *hrtfparams, const size_t BufferSize)
 {
     ASSUME(BufferSize > 0);
 
@@ -35,13 +35,11 @@ inline void MixHrtfBase(const float *InSamples, float2 *RESTRICT AccumSamples, c
 
         stepcount += 1.0f;
     }
-
-    hrtfparams->Gain = gain + gainstep*stepcount;
 }
 
 template<ApplyCoeffsT ApplyCoeffs>
 inline void MixHrtfBlendBase(const float *InSamples, float2 *RESTRICT AccumSamples,
-    const ALuint IrSize, const HrtfFilter *oldparams, MixHrtfFilter *newparams,
+    const ALuint IrSize, const HrtfFilter *oldparams, const MixHrtfFilter *newparams,
     const size_t BufferSize)
 {
     const auto &OldCoeffs = oldparams->Coeffs;
@@ -78,8 +76,6 @@ inline void MixHrtfBlendBase(const float *InSamples, float2 *RESTRICT AccumSampl
 
         stepcount += 1.0f;
     }
-
-    newparams->Gain = newGainStep*stepcount;
 }
 
 template<ApplyCoeffsT ApplyCoeffs>
diff --git a/alc/mixer/mixer_c.cpp b/alc/mixer/mixer_c.cpp
index 64d12ef7..c086dd8d 100644
--- a/alc/mixer/mixer_c.cpp
+++ b/alc/mixer/mixer_c.cpp
@@ -137,12 +137,12 @@ const ALfloat *Resample_<FastBSincTag,CTag>(const InterpState *state, const ALfl
 
 template<>
 void MixHrtf_<CTag>(const float *InSamples, float2 *AccumSamples, const ALuint IrSize,
-    MixHrtfFilter *hrtfparams, const size_t BufferSize)
+    const MixHrtfFilter *hrtfparams, const size_t BufferSize)
 { MixHrtfBase<ApplyCoeffs>(InSamples, AccumSamples, IrSize, hrtfparams, BufferSize); }
 
 template<>
 void MixHrtfBlend_<CTag>(const float *InSamples, float2 *AccumSamples, const ALuint IrSize,
-    const HrtfFilter *oldparams, MixHrtfFilter *newparams, const size_t BufferSize)
+    const HrtfFilter *oldparams, const MixHrtfFilter *newparams, const size_t BufferSize)
 {
     MixHrtfBlendBase<ApplyCoeffs>(InSamples, AccumSamples, IrSize, oldparams, newparams,
         BufferSize);
diff --git a/alc/mixer/mixer_neon.cpp b/alc/mixer/mixer_neon.cpp
index ccfc5761..afc9768a 100644
--- a/alc/mixer/mixer_neon.cpp
+++ b/alc/mixer/mixer_neon.cpp
@@ -191,12 +191,12 @@ const ALfloat *Resample_<FastBSincTag,NEONTag>(const InterpState *state,
 
 template<>
 void MixHrtf_<NEONTag>(const float *InSamples, float2 *AccumSamples, const ALuint IrSize,
-    MixHrtfFilter *hrtfparams, const size_t BufferSize)
+    const MixHrtfFilter *hrtfparams, const size_t BufferSize)
 { MixHrtfBase<ApplyCoeffs>(InSamples, AccumSamples, IrSize, hrtfparams, BufferSize); }
 
 template<>
 void MixHrtfBlend_<NEONTag>(const float *InSamples, float2 *AccumSamples, const ALuint IrSize,
-    const HrtfFilter *oldparams, MixHrtfFilter *newparams, const size_t BufferSize)
+    const HrtfFilter *oldparams, const MixHrtfFilter *newparams, const size_t BufferSize)
 {
     MixHrtfBlendBase<ApplyCoeffs>(InSamples, AccumSamples, IrSize, oldparams, newparams,
         BufferSize);
diff --git a/alc/mixer/mixer_sse.cpp b/alc/mixer/mixer_sse.cpp
index 2fb856e1..3bc7b30f 100644
--- a/alc/mixer/mixer_sse.cpp
+++ b/alc/mixer/mixer_sse.cpp
@@ -167,12 +167,12 @@ const ALfloat *Resample_<FastBSincTag,SSETag>(const InterpState *state,
 
 template<>
 void MixHrtf_<SSETag>(const float *InSamples, float2 *AccumSamples, const ALuint IrSize,
-    MixHrtfFilter *hrtfparams, const size_t BufferSize)
+    const MixHrtfFilter *hrtfparams, const size_t BufferSize)
 { MixHrtfBase<ApplyCoeffs>(InSamples, AccumSamples, IrSize, hrtfparams, BufferSize); }
 
 template<>
 void MixHrtfBlend_<SSETag>(const float *InSamples, float2 *AccumSamples, const ALuint IrSize,
-    const HrtfFilter *oldparams, MixHrtfFilter *newparams, const size_t BufferSize)
+    const HrtfFilter *oldparams, const MixHrtfFilter *newparams, const size_t BufferSize)
 {
     MixHrtfBlendBase<ApplyCoeffs>(InSamples, AccumSamples, IrSize, oldparams, newparams,
         BufferSize);