Update AL_EXTX_source_distance_model to require explicit enabling

The in-progress spec has been updated to reflect this

1 files changed, 48 insertions, 6 deletions

diff --git a/OpenAL32/alState.c b/OpenAL32/alState.c
index 1516bb31..9b17045e 100644
--- a/OpenAL32/alState.c
+++ b/OpenAL32/alState.c
@@ -44,34 +44,66 @@ static const ALchar alErrOutOfMemory[] = "Out of Memory";
 ALAPI ALvoid ALAPIENTRY alEnable(ALenum capability)
 {
     ALCcontext *Context;
+    ALboolean  updateSources = AL_FALSE;
 
     Context = GetContextSuspended();
     if(!Context) return;
 
     switch(capability)
     {
+        case AL_SOURCE_DISTANCE_MODEL:
+            Context->SourceDistanceModel = AL_TRUE;
+            updateSources = AL_TRUE;
+            break;
+
         default:
             alSetError(AL_INVALID_ENUM);
             break;
     }
 
+    if(updateSources)
+    {
+        ALsource *source = Context->Source;
+        while(source)
+        {
+            source->NeedsUpdate = AL_TRUE;
+            source = source->next;
+        }
+    }
+
     ProcessContext(Context);
 }
 
 ALAPI ALvoid ALAPIENTRY alDisable(ALenum capability)
 {
     ALCcontext *Context;
+    ALboolean  updateSources = AL_FALSE;
 
     Context = GetContextSuspended();
     if(!Context) return;
 
     switch(capability)
     {
+        case AL_SOURCE_DISTANCE_MODEL:
+            Context->SourceDistanceModel = AL_FALSE;
+            updateSources = AL_TRUE;
+            break;
+
         default:
             alSetError(AL_INVALID_ENUM);
             break;
     }
 
+    if(updateSources)
+    {
+        ALsource *source = Context->Source;
+        while(source)
+        {
+            source->NeedsUpdate = AL_TRUE;
+            source = source->next;
+        }
+    }
+
     ProcessContext(Context);
 }
 
@@ -85,6 +117,10 @@ ALAPI ALboolean ALAPIENTRY alIsEnabled(ALenum capability)
 
     switch(capability)
     {
+        case AL_SOURCE_DISTANCE_MODEL:
+            value = Context->SourceDistanceModel;
+            break;
+
         default:
             alSetError(AL_INVALID_ENUM);
             break;
@@ -588,7 +624,7 @@ ALAPI ALvoid ALAPIENTRY alSpeedOfSound(ALfloat flSpeedOfSound)
 ALAPI ALvoid ALAPIENTRY alDistanceModel(ALenum value)
 {
     ALCcontext *Context;
-    ALsource *Source;
+    ALboolean updateSources = AL_FALSE;
 
     Context = GetContextSuspended();
     if(!Context) return;
@@ -603,11 +639,7 @@ ALAPI ALvoid ALAPIENTRY alDistanceModel(ALenum value)
         case AL_EXPONENT_DISTANCE:
         case AL_EXPONENT_DISTANCE_CLAMPED:
             Context->DistanceModel = value;
-            for(Source = Context->Source;Source != NULL;Source = Source->next)
-            {
-                Source->DistanceModel = value;
-                Source->NeedsUpdate = AL_TRUE;
-            }
+            updateSources = !Context->SourceDistanceModel;
             break;
 
         default:
@@ -615,5 +647,15 @@ ALAPI ALvoid ALAPIENTRY alDistanceModel(ALenum value)
             break;
     }
 
+    if(updateSources)
+    {
+        ALsource *source = Context->Source;
+        while(source)
+        {
+            source->NeedsUpdate = AL_TRUE;
+            source = source->next;
+        }
+    }
+
     ProcessContext(Context);
 }