Add a helper to search for a channel index by name

Alc/ALc.c

@@ -1535,6 +1535,8 @@ void SetDefaultChannelOrder(ALCdevice *device)
     }
 }
 
+extern inline ALint GetChannelIdxByName(const ALCdevice *device, enum Channel chan);
+
 
 /* alcSetError
  *

Alc/ALu.c

@@ -409,15 +409,8 @@ ALvoid CalcNonAttnSourceParams(ALvoice *voice, const ALsource *ALSource, const A
 
             for(j = 0;j < MaxChannels;j++)
                 gains[j].Target = 0.0f;
-            for(i = 0;i < (ALint)Device->NumSpeakers;i++)
-            {
-                enum Channel chan = Device->Speaker[i].ChanName;
-                if(chan == chans[c].channel)
-                {
-                    gains[chan].Target = DryGain;
-                    break;
-                }
-            }
+            if(GetChannelIdxByName(Device, chans[c].channel) != -1)
+                gains[chans[c].channel].Target = DryGain;
         }
         UpdateDryStepping(&voice->Direct, num_channels);
 
@@ -467,7 +460,8 @@ ALvoid CalcNonAttnSourceParams(ALvoice *voice, const ALsource *ALSource, const A
             {
                 for(i = 0;i < MaxChannels;i++)
                     Target[i] = 0.0f;
-                Target[chans[c].channel] = DryGain;
+                if(GetChannelIdxByName(Device, chans[c].channel) != -1)
+                    Target[chans[c].channel] = DryGain;
                 ok = true;
             }
             else for(i = 0;i < (ALint)Device->NumSpeakers;i++)

Alc/effects/dedicated.c

@@ -55,21 +55,17 @@ static ALvoid ALdedicatedState_update(ALdedicatedState *state, ALCdevice *device
 
     Gain = Slot->Gain * Slot->EffectProps.Dedicated.Gain;
     if(Slot->EffectType == AL_EFFECT_DEDICATED_LOW_FREQUENCY_EFFECT)
-        state->gains[LFE] = Gain;
+    {
+        if(GetChannelIdxByName(device, LFE) != -1)
+            state->gains[LFE] = Gain;
+    }
     else if(Slot->EffectType == AL_EFFECT_DEDICATED_DIALOGUE)
     {
-        ALboolean done = AL_FALSE;
         /* Dialog goes to the front-center speaker if it exists, otherwise it
          * plays from the front-center location. */
-        for(i = 0;i < device->NumSpeakers;i++)
-        {
-            if(device->Speaker[i].ChanName == FrontCenter)
-            {
-                state->gains[FrontCenter] = Gain;
-                done = AL_TRUE;
-            }
-        }
-        if(!done)
+        if(GetChannelIdxByName(device, FrontCenter) != -1)
+            state->gains[FrontCenter] = Gain;
+        else
         {
             static const ALfloat front_dir[3] = { 0.0f, 0.0f, -1.0f };
             ComputeDirectionalGains(device, front_dir, Gain, state->gains);

OpenAL32/Include/alMain.h

@@ -828,6 +828,23 @@ void SetDefaultWFXChannelOrder(ALCdevice *device);
 const ALCchar *DevFmtTypeString(enum DevFmtType type) DECL_CONST;
 const ALCchar *DevFmtChannelsString(enum DevFmtChannels chans) DECL_CONST;
 
+/**
+ * GetChannelIdxByName
+ *
+ * Returns the device's channel index given a channel name (e.g. FrontCenter),
+ * or -1 if it doesn't exist.
+ */
+inline ALint GetChannelIdxByName(const ALCdevice *device, enum Channel chan)
+{
+    ALint i = 0;
+    for(i = 0;i < MaxChannels;i++)
+    {
+        if(device->ChannelName[i] == chan)
+            return i;
+    }
+    return -1;
+}
+
 
 extern FILE *LogFile;