hrtf working example

working example of hrtf set the pref usehrtf to true to test
For now any mhr file that is in the game directory can be used, just run once to get the index of that mhr and pass that index in to $pref::SFX::hrtfProfile

Engine/source/sfx/openal/sfxALDevice.cpp

@@ -352,6 +352,30 @@ void SFXALDevice::printALInfo(ALCdevice* device)
          for (ALCint i = 0; i < profileCount; i++)
             Con::printf("|       [%d] %s", i,
                alcGetStringiSOFT(device, ALC_HRTF_SPECIFIER_SOFT, i));
+
+      bool use_hrtf = Con::getBoolVariable("$pref::SFX::useHRTF");
+      if (use_hrtf && (mCaps & CAPS_HotReconnect))
+      {
+         ALCint attr[5];
+         ALCint index = Con::getIntVariable("$pref::SFX::hrtfProfile");
+         ALCint i;
+
+         i = 0;
+         attr[i++] = ALC_HRTF_SOFT;
+         attr[i++] = ALC_TRUE;
+         // load the default device hrtf.
+         if (index >= 0 && index < profileCount)
+         {
+            attr[i++] = ALC_HRTF_ID_SOFT;
+            attr[i++] = index;
+         }
+         attr[i] = 0;
+
+         if (!alcResetDeviceSOFT(mDevice, attr))
+         {
+            Con::printf("Failed to reset device: %s", alcGetString(mDevice, alcGetError(mDevice)));
+         }
+      }
    }
 
    // --- EFX ---

Engine/source/sfx/sfxDevice.cpp

@@ -33,6 +33,7 @@ S32 SFXDevice::smUpdateInterval = SFXInternal::DEFAULT_UPDATE_INTERVAL;
 S32 SFXDevice::smDeviceFrequency = 44100;
 S32 SFXDevice::smMaxSendsPerSource = 4;
 S32 SFXDevice::smMaxEffectSlots = 4;
+S32 SFXDevice::smDeviceHRTFProfile = -1;
 S8 SFXDevice::smDeviceBitrate = 16;
 bool SFXDevice::smDeviceHRTF = false;
 
@@ -51,6 +52,11 @@ void SFXDevice::initConsole()
       "The device uses hrtf.\n"
       "@ingroup SFX\n");
 
+   Con::addVariable("$pref::SFX::hrtfProfile", TypeS32, &smDeviceHRTFProfile,
+      "Index of the HRTF profile to use. -1 = driver default. "
+      "Use sfxGetHRTFProfileCount/sfxGetHRTFProfileName to enumerate available profiles.\n"
+      "@ingroup SFX\n");
+
    Con::addVariable("$pref::SFX::updateInterval", TypeS32, &smUpdateInterval,
       "The update interval.\n"
       "@ingroup SFX\n");

Engine/source/sfx/sfxDevice.h

@@ -81,6 +81,8 @@ class SFXDevice
       static S32 smUpdateInterval;
       /// The device frequency, used when reading in buffers for the device.
       static S32 smDeviceFrequency;
+      /// The device hrtf profile to use.
+      static S32 smDeviceHRTFProfile;
       /// The device bitrate.
       static S8 smDeviceBitrate;
       /// Does the device use hrtf