3 files changed, 11 insertions, 2 deletions
diff --git a/Alc/ALc.c b/Alc/ALc.c
index 2dbe52f9..dc781835 100644
--- a/Alc/ALc.c
+++ b/Alc/ALc.c
@@ -384,6 +384,9 @@ static ALint RTPrioLevel;
 // Output Log File
 static FILE *LogFile;
 
+// Cone scalar
+ALdouble ConeScale = 0.5;
+
 ///////////////////////////////////////////////////////
 
 
@@ -435,6 +438,10 @@ static void alc_init(void)
     if(!LogFile)
         LogFile = stderr;
 
+    str = getenv("__ALSOFT_HALF_ANGLE_CONES");
+    if(str && (strcasecmp(str, "true") == 0 || strtol(str, NULL, 0) == 1))
+        ConeScale = 1.0;
+
     InitializeCriticalSection(&g_csMutex);
     ALTHUNK_INIT();
     ReadALConfig();
diff --git a/Alc/ALu.c b/Alc/ALu.c
index ea5a0319..49cedab8 100644
--- a/Alc/ALu.c
+++ b/Alc/ALu.c
@@ -357,8 +357,8 @@ ALvoid CalcSourceParams(ALsource *ALSource, const ALCcontext *ALContext)
     MinDist      = ALSource->flRefDistance;
     MaxDist      = ALSource->flMaxDistance;
     Rolloff      = ALSource->flRollOffFactor;
-    InnerAngle   = ALSource->flInnerAngle * 0.5f;
-    OuterAngle   = ALSource->flOuterAngle * 0.5f;
+    InnerAngle   = ALSource->flInnerAngle * ConeScale;
+    OuterAngle   = ALSource->flOuterAngle * ConeScale;
     OuterGainHF  = ALSource->OuterGainHF;
     AirAbsorptionFactor = ALSource->AirAbsorptionFactor;
 
diff --git a/OpenAL32/Include/alMain.h b/OpenAL32/Include/alMain.h
index 9aad3036..eab68070 100644
--- a/OpenAL32/Include/alMain.h
+++ b/OpenAL32/Include/alMain.h
@@ -583,6 +583,8 @@ void al_print(const char *fname, unsigned int line, const char *fmt, ...)
              PRINTF_STYLE(3,4);
 #define AL_PRINT(...) al_print(__FILE__, __LINE__, __VA_ARGS__)
 
+extern ALdouble ConeScale;
+
 #ifdef __cplusplus
 }
 #endif