Move the meters per unit property to the listener

al/listener.cpp

@@ -62,11 +62,8 @@ START_API_FUNC
     case AL_METERS_PER_UNIT:
         if(!(value >= AL_MIN_METERS_PER_UNIT && value <= AL_MAX_METERS_PER_UNIT))
             SETERR_RETURN(context, AL_INVALID_VALUE,, "Listener meters per unit out of range");
-        context->mMetersPerUnit = value;
-        if(!context->mDeferUpdates.load(std::memory_order_acquire))
-            UpdateContextProps(context.get());
-        else
-            context->mPropsClean.clear(std::memory_order_release);
+        listener.mMetersPerUnit = value;
+        DO_UPDATEPROPS();
         break;
 
     default:
@@ -252,7 +249,7 @@ START_API_FUNC
         break;
 
     case AL_METERS_PER_UNIT:
-        *value = context->mMetersPerUnit;
+        *value = listener.mMetersPerUnit;
         break;
 
     default:
@@ -439,6 +436,7 @@ void UpdateListenerProps(ALCcontext *context)
     props->OrientAt = listener.OrientAt;
     props->OrientUp = listener.OrientUp;
     props->Gain = listener.Gain;
+    props->MetersPerUnit = listener.mMetersPerUnit;
 
     /* Set the new container for updating internal parameters. */
     props = listener.Update.exchange(props, std::memory_order_acq_rel);

al/listener.h

@@ -6,6 +6,7 @@
 
 #include "AL/al.h"
 #include "AL/alc.h"
+#include "AL/alext.h"
 
 #include "vecmat.h"
 
@@ -18,6 +19,7 @@ struct ALlistenerProps {
     std::array<ALfloat,3> OrientAt;
     std::array<ALfloat,3> OrientUp;
     ALfloat Gain;
+    ALfloat MetersPerUnit;
 
     std::atomic<ALlistenerProps*> next;
 };
@@ -28,6 +30,7 @@ struct ALlistener {
     std::array<ALfloat,3> OrientAt{{0.0f, 0.0f, -1.0f}};
     std::array<ALfloat,3> OrientUp{{0.0f, 1.0f, 0.0f}};
     ALfloat Gain{1.0f};
+    ALfloat mMetersPerUnit{AL_DEFAULT_METERS_PER_UNIT};
 
     std::atomic_flag PropsClean;
 

al/state.cpp

@@ -836,8 +836,6 @@ void UpdateContextProps(ALCcontext *context)
     }
 
     /* Copy in current property values. */
-    props->MetersPerUnit = context->mMetersPerUnit;
-
     props->DopplerFactor = context->mDopplerFactor;
     props->DopplerVelocity = context->mDopplerVelocity;
     props->SpeedOfSound = context->mSpeedOfSound;

alc/alc.cpp

@@ -2445,7 +2445,7 @@ void ALCcontext::init()
     mListener.Params.Matrix = alu::Matrix::Identity();
     mListener.Params.Velocity = alu::Vector{};
     mListener.Params.Gain = mListener.Gain;
-    mListener.Params.MetersPerUnit = mMetersPerUnit;
+    mListener.Params.MetersPerUnit = mListener.mMetersPerUnit;
     mListener.Params.DopplerFactor = mDopplerFactor;
     mListener.Params.SpeedOfSound = mSpeedOfSound * mDopplerVelocity;
     mListener.Params.SourceDistanceModel = mSourceDistanceModel;

alc/alcontext.h

@@ -48,7 +48,6 @@ struct ALcontextProps {
     ALfloat SpeedOfSound;
     ALboolean SourceDistanceModel;
     DistanceModel mDistanceModel;
-    ALfloat MetersPerUnit;
 
     std::atomic<ALcontextProps*> next;
 };
@@ -102,7 +101,6 @@ struct ALCcontext : public al::intrusive_ref<ALCcontext> {
     ALfloat mDopplerFactor{1.0f};
     ALfloat mDopplerVelocity{1.0f};
     ALfloat mSpeedOfSound{SPEEDOFSOUNDMETRESPERSEC};
-    ALfloat mMetersPerUnit{AL_DEFAULT_METERS_PER_UNIT};
 
     std::atomic_flag mPropsClean;
     std::atomic<bool> mDeferUpdates{false};

alc/alu.cpp

@@ -271,8 +271,6 @@ bool CalcContextParams(ALCcontext *Context)
     if(!props) return false;
 
     ALlistener &Listener = Context->mListener;
-    Listener.Params.MetersPerUnit = props->MetersPerUnit;
-
     Listener.Params.DopplerFactor = props->DopplerFactor;
     Listener.Params.SpeedOfSound = props->SpeedOfSound * props->DopplerVelocity;
 
@@ -314,6 +312,7 @@ bool CalcListenerParams(ALCcontext *Context)
     Listener.Params.Velocity = Listener.Params.Matrix * vel;
 
     Listener.Params.Gain = props->Gain * Context->mGainBoost;
+    Listener.Params.MetersPerUnit = props->MetersPerUnit;
 
     AtomicReplaceHead(Context->mFreeListenerProps, props);
     return true;