Enable Oculus Fixed Foveated Rendering

- Option to change value added to the developer
  settings UI.
- Default with a value of 2 (0 = none, 3 = max).

app/src/common/shared/org/mozilla/vrbrowser/VRBrowserActivity.java

@@ -191,6 +191,7 @@ protected void onCreate(Bundle savedInstanceState) {
         final String tempPath = getCacheDir().getAbsolutePath();
         queueRunnable(() -> setTemporaryFilePath(tempPath));
         setCylinderDensity(SettingsStore.getInstance(this).getCylinderDensity());
+        updateFoveatedLevel();
         initializeWorld();
 
         // Setup the search engine
@@ -961,6 +962,13 @@ public void updateEnvironment() {
         queueRunnable(() -> updateEnvironmentNative());
     }
 
+    @Override
+    public void updateFoveatedLevel() {
+        final int appLevel = SettingsStore.getInstance(this).getFoveatedLevelApp();
+        final int webVRLevel = SettingsStore.getInstance(this).getFoveatedLevelWebVR();
+        queueRunnable(() -> updateFoveatedLevelNative(appLevel, webVRLevel));
+    }
+
     @Override
     public void updatePointerColor() {
         queueRunnable(() -> updatePointerColorNative());
@@ -1029,4 +1037,5 @@ public void setCylinderDensity(final float aDensity) {
     private native void runCallbackNative(long aCallback);
     private native void setCylinderDensityNative(float aDensity);
     private native void setIsServo(boolean aIsServo);
+    private native void updateFoveatedLevelNative(int appLevel, int webVRLevel);
 }

app/src/common/shared/org/mozilla/vrbrowser/browser/SettingsStore.java

@@ -58,6 +58,8 @@ SettingsStore getInstance(final @NonNull Context aContext) {
     public final static int MSAA_DEFAULT_LEVEL = 1;
     public final static boolean AUDIO_ENABLED = false;
     public final static float CYLINDER_DENSITY_ENABLED_DEFAULT = 4680.0f;
+    public final static int FOVEATED_APP_DEFAULT_LEVEL = 1;
+    public final static int FOVEATED_WEBVR_DEFAULT_LEVEL = 0;
 
     // Enable telemetry by default (opt-out).
     private final static boolean enableCrashReportingByDefault = false;
@@ -360,7 +362,6 @@ public void setMSAALevel(int level) {
         editor.commit();
     }
 
-
     public boolean getLayersEnabled() {
         if (BuildConfig.FLAVOR_platform.equalsIgnoreCase("oculusvr")) {
             return true;
@@ -404,6 +405,28 @@ public float getCylinderDensity() {
     public void setCylinderDensity(float aDensity) {
         SharedPreferences.Editor editor = mPrefs.edit();
         editor.putFloat(mContext.getString(R.string.settings_key_cylinder_density), aDensity);
+    }
+
+    public int getFoveatedLevelApp() {
+        return mPrefs.getInt(
+                mContext.getString(R.string.settings_key_foveated_app), FOVEATED_APP_DEFAULT_LEVEL);
+    }
+
+    public int getFoveatedLevelWebVR() {
+        return mPrefs.getInt(
+                mContext.getString(R.string.settings_key_foveated_webvr), FOVEATED_WEBVR_DEFAULT_LEVEL);
+    }
+
+    public void setFoveatedLevelApp(int level) {
+        SharedPreferences.Editor editor = mPrefs.edit();
+        editor.putInt(mContext.getString(R.string.settings_key_foveated_app), level);
+        editor.commit();
+    }
+
+    public void setFoveatedLevelWebVR(int level) {
+        SharedPreferences.Editor editor = mPrefs.edit();
+        editor.putInt(mContext.getString(R.string.settings_key_foveated_webvr), level);
         editor.commit();
     }
 }
+

app/src/common/shared/org/mozilla/vrbrowser/ui/views/settings/RadioGroupSetting.java

@@ -121,6 +121,10 @@ public void setOnCheckedChangeListener(OnCheckedChangeListener aListener) {
         mRadioGroupListener = aListener;
     }
 
+    public OnCheckedChangeListener getOnCheckdChangeListener() {
+        return mRadioGroupListener;
+    }
+
     public Object getValueForId(@IdRes int checkId) {
         return mValues[checkId];
     }

app/src/common/shared/org/mozilla/vrbrowser/ui/widgets/WidgetManagerDelegate.java

@@ -42,6 +42,7 @@ interface WorldClickListener {
     void setIsServoSession(boolean aIsServo);
     void keyboardDismissed();
     void updateEnvironment();
+    void updateFoveatedLevel();
     void updatePointerColor();
     void showVRVideo(int aWindowHandle, @VideoProjectionMenuWidget.VideoProjectionFlags int aVideoProjection);
     void hideVRVideo();

app/src/common/shared/org/mozilla/vrbrowser/ui/widgets/options/DisplayOptionsWidget.java

@@ -9,12 +9,15 @@
 import android.util.AttributeSet;
 import android.view.View;
 import android.widget.CompoundButton;
+import android.widget.RadioGroup;
 import android.widget.ScrollView;
 
 import org.mozilla.vrbrowser.R;
 import org.mozilla.vrbrowser.audio.AudioEngine;
 import org.mozilla.vrbrowser.browser.SessionStore;
 import org.mozilla.vrbrowser.browser.SettingsStore;
+import org.mozilla.vrbrowser.BuildConfig;
+import org.mozilla.vrbrowser.audio.AudioEngine;
 import org.mozilla.vrbrowser.ui.views.UIButton;
 import org.mozilla.vrbrowser.ui.views.settings.ButtonSetting;
 import org.mozilla.vrbrowser.ui.views.settings.DoubleEditSetting;
@@ -36,6 +39,8 @@ public class DisplayOptionsWidget extends UIWidget implements
     private SwitchSetting mCurvedDisplaySwitch;
     private RadioGroupSetting mUaModeRadio;
     private RadioGroupSetting mMSAARadio;
+    private RadioGroupSetting mFoveatedAppRadio;
+    private RadioGroupSetting mFoveatedWebVRRadio;
 
     private SingleEditSetting mDensityEdit;
     private SingleEditSetting mDpiEdit;
@@ -97,6 +102,21 @@ private void initialize(Context aContext) {
         mMSAARadio.setOnCheckedChangeListener(mMSSAChangeListener);
         setMSAAMode(mMSAARadio.getIdForValue(msaaLevel), false);
 
+        mFoveatedAppRadio = findViewById(R.id.foveated_app_radio);
+        mFoveatedWebVRRadio = findViewById(R.id.foveated_webvr_radio);
+        if (BuildConfig.FLAVOR_platform == "oculusvr") {
+            mFoveatedAppRadio.setVisibility(View.VISIBLE);
+            // Uncomment this when Foveated Rendering for WebVR makes more sense
+            //mFoveatedWebVRRadio.setVisibility(View.VISIBLE);
+            int level = SettingsStore.getInstance(getContext()).getFoveatedLevelApp();
+            setFoveatedLevel(mFoveatedAppRadio, mFoveatedAppRadio.getIdForValue(level), false);
+            mFoveatedAppRadio.setOnCheckedChangeListener((compoundButton, checkedId, apply) -> setFoveatedLevel(mFoveatedAppRadio, checkedId, apply));
+
+            level = SettingsStore.getInstance(getContext()).getFoveatedLevelWebVR();
+            setFoveatedLevel(mFoveatedWebVRRadio, mFoveatedWebVRRadio.getIdForValue(level), false);
+            mFoveatedWebVRRadio.setOnCheckedChangeListener((compoundButton, checkedId, apply) -> setFoveatedLevel(mFoveatedWebVRRadio, checkedId, apply));
+        }
+
         mDensityEdit = findViewById(R.id.density_edit);
         mDensityEdit.setHint1(String.valueOf(SettingsStore.DISPLAY_DENSITY_DEFAULT));
         mDensityEdit.setDefaultFirstValue(String.valueOf(SettingsStore.DISPLAY_DENSITY_DEFAULT));
@@ -224,7 +244,6 @@ private void onRestartDialogDismissed() {
        show();
     }
 
-
     private RadioGroupSetting.OnCheckedChangeListener mUaModeListener = (radioGroup, checkedId, doApply) -> {
         setUaMode(checkedId, true);
     };
@@ -292,6 +311,14 @@ private void onRestartDialogDismissed() {
         if (!mMSAARadio.getValueForId(mMSAARadio.getCheckedRadioButtonId()).equals(SettingsStore.MSAA_DEFAULT_LEVEL)) {
             setMSAAMode(mMSAARadio.getIdForValue(SettingsStore.MSAA_DEFAULT_LEVEL), true);
         }
+        if (BuildConfig.FLAVOR_platform == "oculusvr") {
+            if (!mFoveatedAppRadio.getValueForId(mFoveatedAppRadio.getCheckedRadioButtonId()).equals(SettingsStore.FOVEATED_APP_DEFAULT_LEVEL)) {
+                setFoveatedLevel(mFoveatedAppRadio, mFoveatedAppRadio.getIdForValue(SettingsStore.FOVEATED_APP_DEFAULT_LEVEL), true);
+            }
+            if (!mFoveatedWebVRRadio.getValueForId(mFoveatedWebVRRadio.getCheckedRadioButtonId()).equals(SettingsStore.FOVEATED_WEBVR_DEFAULT_LEVEL)) {
+                setFoveatedLevel(mFoveatedWebVRRadio, mFoveatedWebVRRadio.getIdForValue(SettingsStore.FOVEATED_WEBVR_DEFAULT_LEVEL), true);
+            }
+        }
 
         restart = restart | setDisplayDensity(SettingsStore.DISPLAY_DENSITY_DEFAULT);
         restart = restart | setDisplayDpi(SettingsStore.DISPLAY_DPI_DEFAULT);
@@ -332,6 +359,25 @@ private void setMSAAMode(int checkedId, boolean doApply) {
         }
     }
 
+    private void setFoveatedLevel(RadioGroupSetting aSetting, int checkedId, boolean doApply) {
+        RadioGroupSetting.OnCheckedChangeListener listener = aSetting.getOnCheckdChangeListener();
+        aSetting.setOnCheckedChangeListener(null);
+        aSetting.setChecked(checkedId, doApply);
+        aSetting.setOnCheckedChangeListener(listener);
+
+        int level = (Integer)aSetting.getValueForId(checkedId);
+
+        if (aSetting == mFoveatedAppRadio) {
+            SettingsStore.getInstance(getContext()).setFoveatedLevelApp(level);
+        } else {
+            SettingsStore.getInstance(getContext()).setFoveatedLevelWebVR(level);
+        }
+
+        if (doApply) {
+            mWidgetManager.updateFoveatedLevel();
+        }
+    }
+
     private boolean setDisplayDensity(float newDensity) {
         mDensityEdit.setOnClickListener(null);
         boolean restart = false;

app/src/main/cpp/BrowserWorld.cpp

@@ -670,6 +670,12 @@ BrowserWorld::UpdateEnvironment() {
   CreateSkyBox(env.c_str(), "");
 }
 
+void
+BrowserWorld::UpdateFoveatedLevel(const int aAppLevel, const int aWebVRLevel) {
+  ASSERT_ON_RENDER_THREAD();
+  m.device->SetFoveatedLevel(aAppLevel, aWebVRLevel);
+}
+
 void
 BrowserWorld::UpdatePointerColor() {
   ASSERT_ON_RENDER_THREAD();
@@ -1297,6 +1303,11 @@ JNI_METHOD(void, updateEnvironmentNative)
   crow::BrowserWorld::Instance().UpdateEnvironment();
 }
 
+JNI_METHOD(void, updateFoveatedLevelNative)
+(JNIEnv *aEnv, jobject, jint aAppLevel, jint aWebVRLevel) {
+  crow::BrowserWorld::Instance().UpdateFoveatedLevel(aAppLevel, aWebVRLevel);
+}
+
 JNI_METHOD(void, updatePointerColorNative)
 (JNIEnv* aEnv, jobject) {
   crow::BrowserWorld::Instance().UpdatePointerColor();

app/src/main/cpp/BrowserWorld.h

@@ -40,6 +40,7 @@ class BrowserWorld {
   void Draw();
   void SetTemporaryFilePath(const std::string& aPath);
   void UpdateEnvironment();
+  void UpdateFoveatedLevel(const int aAppLevel, const int aWebVRLevel);
   void UpdatePointerColor();
   void SetSurfaceTexture(const std::string& aName, jobject& aSurface);
   void AddWidget(int32_t aHandle, const WidgetPlacementPtr& placement);

app/src/main/cpp/DeviceDelegate.h

@@ -56,6 +56,7 @@ class DeviceDelegate {
   virtual void SetClearColor(const vrb::Color& aColor) = 0;
   virtual void SetClipPlanes(const float aNear, const float aFar) = 0;
   virtual void SetControllerDelegate(ControllerDelegatePtr& aController) = 0;
+  virtual void SetFoveatedLevel(const int32_t aAppLevel, const int32_t aWebVRLevel) {};
   virtual void ReleaseControllerDelegate() = 0;
   virtual int32_t GetControllerModelCount() const = 0;
   virtual const std::string GetControllerModelName(const int32_t aModelIndex) const = 0;

app/src/main/res/layout/options_display.xml

@@ -67,6 +67,24 @@
                     app:options="@array/developer_options_msaa"
                     app:values="@array/developer_options_ua_mode_values" />
 
+                <org.mozilla.vrbrowser.ui.views.settings.RadioGroupSetting
+                    android:id="@+id/foveated_app_radio"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    app:description="@string/developer_options_foveated_app"
+                    android:visibility="gone"
+                    app:options="@array/developer_options_foveated_options"
+                    app:values="@array/developer_options_foveated_values" />
+
+                <org.mozilla.vrbrowser.ui.views.settings.RadioGroupSetting
+                    android:id="@+id/foveated_webvr_radio"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    app:description="@string/developer_options_foveated_webvr"
+                    android:visibility="gone"
+                    app:options="@array/developer_options_foveated_options"
+                    app:values="@array/developer_options_foveated_values" />
+
                 <org.mozilla.vrbrowser.ui.views.settings.SingleEditSetting
                     android:id="@+id/density_edit"
                     android:layout_width="match_parent"

app/src/main/res/values/non_L10n.xml

@@ -28,6 +28,8 @@
     <string name="settings_key_audio" translatable="false">settings_audio</string>
     <string name="settings_key_voice_search_language" translatable="false">settings_voice_search_language</string>
     <string name="settings_key_cylinder_density" translatable="false">settings_cylinder_density</string>
+    <string name="settings_key_foveated_app" translatable="false">settings_foveated_app</string>
+    <string name="settings_key_foveated_webvr" translatable="false">settings_foveated_webvr</string>
     <string name="private_browsing_support_url" translatable="false">https://support.mozilla.org/kb/private-mode-firefox-reality</string>
     <string name="settings_key_browser_world_width" translatable="false">settings_browser_world_width</string>
     <string name="settings_key_browser_world_height" translatable="false">settings_browser_world_height</string>

app/src/main/res/values/options_values.xml

@@ -66,6 +66,21 @@
         <item>@string/developer_options_msaa_4</item>
     </string-array>
 
+    <!-- Foveated Levels -->
+    <string-array name="developer_options_foveated_options" translatable="false">
+        <item>@string/developer_options_foveated_disabled</item>
+        <item>@string/developer_options_foveated_1</item>
+        <item>@string/developer_options_foveated_2</item>
+        <item>@string/developer_options_foveated_3</item>
+    </string-array>
+
+    <integer-array name="developer_options_foveated_values" translatable="false">
+        <item>0</item>
+        <item>1</item>
+        <item>2</item>
+        <item>3</item>
+    </integer-array>
+
     <!-- Language Options -->
     <string-array name="developer_options_voice_search_languages" translatable="false">
         <item>@string/language_en_US</item>

app/src/main/res/values/strings.xml

@@ -254,6 +254,26 @@
     <!-- This string is used to label the 'VR' radio button of the 'User-Agent Mode' settings option. -->
     <string name="developer_options_ua_vr">VR</string>
 
+    <!-- This string is used to label radio buttons for setting fixed-foveated-rendering (FFR) level.
+     Higher values of this option result in larger parts of the peripheral vision being rendered
+     at lower resolutions than the content in the center of the view.  These higher values reduce
+     quality to increase performance.  The Oculus implementation of fixed-foveated-rendering is
+     described in more detail here:
+     https://developer.oculus.com/blog/optimizing-oculus-go-for-performance/-->
+    <string name="developer_options_foveated_app">Foveation Level (App)</string>
+    <!-- This string is used to label radio buttons for setting foveated level for WebVR immersive experiences -->
+    <string name="developer_options_foveated_webvr">Foveation Level (WebVR)</string>
+    <!-- This string is used to label the Foveated radio button that disables fixed-foveated-rendering in immersive mode. -->
+    <string name="developer_options_foveated_disabled">Disabled</string>
+    <!-- This string is used to label the Foveated radio button that enables low-level fixed-foveated-rendering. -->
+    <string name="developer_options_foveated_1">1</string>
+    <!-- This string is used to label the Foveated radio button that enables medium-level fixed-foveated-rendering. -->
+    <string name="developer_options_foveated_2">2</string>
+    <!-- This string is used to label the Foveated radio button that enables high-level fixed-foveated-rendering. -->
+    <string name="developer_options_foveated_3">3</string>
+    <!-- This string is used to label a set of radio buttons that allow the user to
+     change the user-agent (UA) string of the browser. -->
+
     <!-- This string is used to label a set of radio buttons that allow the user to change the
      scroll direction of the remote controller. -->
     <string name="developer_options_scroll_direction">Scroll Direction</string>

app/src/oculusvr/cpp/DeviceDelegateOculusVR.cpp

@@ -609,6 +609,8 @@ struct DeviceDelegateOculusVR::State {
   ovrTracking2 predictedTracking = {};
   uint32_t renderWidth = 0;
   uint32_t renderHeight = 0;
+  int32_t standaloneFoveatedLevel = 0;
+  int32_t immersiveFoveatedLevel = 0;
   vrb::Color clearColor;
   float near = 0.1f;
   float far = 100.f;
@@ -688,6 +690,17 @@ struct DeviceDelegateOculusVR::State {
     }
   }
 
+  void UpdateFoveatedLevel() {
+    if (!ovr) {
+      return;
+    }
+    if (renderMode == device::RenderMode::StandAlone) {
+      vrapi_SetPropertyInt(&java, VRAPI_FOVEATION_LEVEL, standaloneFoveatedLevel);
+    } else {
+      vrapi_SetPropertyInt(&java, VRAPI_FOVEATION_LEVEL, immersiveFoveatedLevel);
+    }
+  }
+
   void AddUILayer(const OculusLayerPtr& aLayer, VRLayerSurface::SurfaceType aSurfaceType) {
     if (ovr) {
       vrb::RenderContextPtr ctx = context.lock();
@@ -972,6 +985,7 @@ DeviceDelegateOculusVR::SetRenderMode(const device::RenderMode aMode) {
   }
 
   m.UpdateTrackingMode();
+  m.UpdateFoveatedLevel();
 
   // Reset reorient when exiting or entering immersive
   m.reorientMatrix = vrb::Matrix::Identity();
@@ -1048,6 +1062,13 @@ DeviceDelegateOculusVR::ReleaseControllerDelegate() {
   m.controller = nullptr;
 }
 
+void
+DeviceDelegateOculusVR::SetFoveatedLevel(const int32_t aAppLevel, const int32_t aWebVRLevel) {
+  m.standaloneFoveatedLevel = aAppLevel;
+  m.immersiveFoveatedLevel = aWebVRLevel;
+  m.UpdateFoveatedLevel();
+}
+
 int32_t
 DeviceDelegateOculusVR::GetControllerModelCount() const {
   if (m.IsOculusQuest()) {
@@ -1425,6 +1446,7 @@ DeviceDelegateOculusVR::EnterVR(const crow::BrowserEGLContext& aEGLContext) {
     vrapi_SetPerfThread(m.ovr, VRAPI_PERF_THREAD_TYPE_MAIN, gettid());
     vrapi_SetPerfThread(m.ovr, VRAPI_PERF_THREAD_TYPE_RENDERER, gettid());
     m.UpdateTrackingMode();
+    m.UpdateFoveatedLevel();
   }
 
   // Reset reorientation after Enter VR

app/src/oculusvr/cpp/DeviceDelegateOculusVR.h

@@ -35,6 +35,7 @@ class DeviceDelegateOculusVR : public DeviceDelegate {
   void SetClipPlanes(const float aNear, const float aFar) override;
   void SetControllerDelegate(ControllerDelegatePtr& aController) override;
   void ReleaseControllerDelegate() override;
+  void SetFoveatedLevel(const int32_t aAppLevel, const int32_t aWebVRLevel) override;
   int32_t GetControllerModelCount() const override;
   const std::string GetControllerModelName(const int32_t aModelIndex) const override;
   void ProcessEvents() override;