diff --git a/opengl/tools/glgen/gen b/opengl/tools/glgen/gen
index 7fd9c3a..f73fa5d 100755
--- a/opengl/tools/glgen/gen
+++ b/opengl/tools/glgen/gen
@@ -22,8 +22,10 @@
 
 mkdir -p out/javax/microedition/khronos/opengles
 mkdir -p out/com/google/android/gles_jni
+mkdir -p out/android/annotation
 mkdir -p out/android/app
 mkdir -p out/android/graphics
+mkdir -p out/android/hardware
 mkdir -p out/android/view
 mkdir -p out/android/opengl
 mkdir -p out/android/content
@@ -34,18 +36,20 @@
 echo "package android.graphics;" > out/android/graphics/Canvas.java
 echo "public interface Canvas {}" >> out/android/graphics/Canvas.java
 
+echo "package android.annotation; public @interface NonNull {}" > out/android/annotation/NonNull.java
 echo "package android.app; import android.content.pm.IPackageManager; public class AppGlobals { public static IPackageManager getPackageManager() { return null;} }" > out/android/app/AppGlobals.java
 # echo "package android.content; import android.content.pm.PackageManager; public interface Context { public PackageManager getPackageManager(); }" > out/android/content/Context.java
 echo "package android.content.pm; public class ApplicationInfo {public int targetSdkVersion;}" > out/android/content/pm/ApplicationInfo.java
 echo "package android.content.pm; public interface IPackageManager {ApplicationInfo getApplicationInfo(java.lang.String packageName, int flags, java.lang.String userId) throws android.os.RemoteException;}" > out/android/content/pm/IPackageManager.java
-echo "package android.os; public class Build {public static class VERSION_CODES { public static final int CUPCAKE = 3;};	}" > out/android/os/Build.java
+echo "package android.hardware; import android.os.ParcelFileDescriptor; public class SyncFence { public static SyncFence create(ParcelFileDescriptor w) { return null; } public static SyncFence createEmpty() { return null; } }" > out/android/hardware/SyncFence.java
+echo "package android.os; public class Build {public static class VERSION_CODES { public static final int CUPCAKE = 0; public static final int R = 0; }; }" > out/android/os/Build.java
+echo "package android.os; public class ParcelFileDescriptor { public static ParcelFileDescriptor adoptFd(int fd) { return null; } }" > out/android/os/ParcelFileDescriptor.java
 echo "package android.os; public class UserHandle {public static String myUserId() { return \"\"; } }" > out/android/os/UserHandle.java
 echo "package android.os; public class RemoteException extends Exception {}" > out/android/os/RemoteException.java
-echo "package android.util; public class Log {public static void w(String a, String b) {} public static void e(String a, String b) {}}" > out/android/util/Log.java
+echo "package android.util; public class Log {public static void d(String a, String b) {} public static void w(String a, String b) {} public static void e(String a, String b) {}}" > out/android/util/Log.java
 
 echo "package android.opengl; public abstract class EGLObjectHandle { public int getHandle() { return 0; } }" > out/android/opengl/EGLObjectHandle.java
 
-
 echo "package android.graphics;" > out/android/graphics/SurfaceTexture.java
 echo "public interface SurfaceTexture {}" >> out/android/graphics/SurfaceTexture.java
 echo "package android.view;" > out/android/view/SurfaceView.java
diff --git a/opengl/tools/glgen/stubs/egl/EGL14Header.java-if b/opengl/tools/glgen/stubs/egl/EGL14Header.java-if
index 951ecff..695b571 100644
--- a/opengl/tools/glgen/stubs/egl/EGL14Header.java-if
+++ b/opengl/tools/glgen/stubs/egl/EGL14Header.java-if
@@ -20,6 +20,7 @@
 
 import android.compat.annotation.UnsupportedAppUsage;
 import android.graphics.SurfaceTexture;
+import android.os.Build;
 import android.view.Surface;
 import android.view.SurfaceHolder;
 import android.view.SurfaceView;
diff --git a/opengl/tools/glgen/stubs/egl/EGL14cHeader.cpp b/opengl/tools/glgen/stubs/egl/EGL14cHeader.cpp
index b2ea041..ea55179 100644
--- a/opengl/tools/glgen/stubs/egl/EGL14cHeader.cpp
+++ b/opengl/tools/glgen/stubs/egl/EGL14cHeader.cpp
@@ -17,6 +17,7 @@
 // This source file is automatically generated
 
 #pragma GCC diagnostic ignored "-Wunused-variable"
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
 #pragma GCC diagnostic ignored "-Wunused-function"
 
 #include "jni.h"
diff --git a/opengl/tools/glgen/stubs/egl/EGL15cHeader.cpp b/opengl/tools/glgen/stubs/egl/EGL15cHeader.cpp
index 6dffac5..8e452fb 100644
--- a/opengl/tools/glgen/stubs/egl/EGL15cHeader.cpp
+++ b/opengl/tools/glgen/stubs/egl/EGL15cHeader.cpp
@@ -17,6 +17,7 @@
 // This source file is automatically generated
 
 #pragma GCC diagnostic ignored "-Wunused-variable"
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
 #pragma GCC diagnostic ignored "-Wunused-function"
 
 #include "jni.h"
diff --git a/opengl/tools/glgen/stubs/egl/EGLExtHeader.java-if b/opengl/tools/glgen/stubs/egl/EGLExtHeader.java-if
index 523bc57..75e1704 100644
--- a/opengl/tools/glgen/stubs/egl/EGLExtHeader.java-if
+++ b/opengl/tools/glgen/stubs/egl/EGLExtHeader.java-if
@@ -18,6 +18,11 @@
 
 package android.opengl;
 
+import android.annotation.NonNull;
+import android.hardware.SyncFence;
+import android.os.ParcelFileDescriptor;
+import android.util.Log;
+
 /**
  * EGL Extensions
  */
@@ -30,8 +35,44 @@
     public static final int EGL_OPENGL_ES3_BIT_KHR          = 0x0040;
     public static final int EGL_RECORDABLE_ANDROID          = 0x3142;
 
+    // EGL_ANDROID_native_fence_sync
+    public static final int EGL_SYNC_NATIVE_FENCE_ANDROID     = 0x3144;
+    public static final int EGL_SYNC_NATIVE_FENCE_FD_ANDROID  = 0x3145;
+    public static final int EGL_SYNC_NATIVE_FENCE_SIGNALED_ANDROID = 0x3146;
+    public static final int EGL_NO_NATIVE_FENCE_FD_ANDROID    = -1;
+
     native private static void _nativeClassInit();
     static {
         _nativeClassInit();
     }
 
+    /**
+     * Retrieves the SyncFence for an EGLSync created with EGL_SYNC_NATIVE_FENCE_ANDROID
+     *
+     * See <a href="https://www.khronos.org/registry/EGL/extensions/ANDROID/EGL_ANDROID_native_fence_sync.txt">
+     *     EGL_ANDROID_native_fence_sync</a> extension for more details
+     * @param display The EGLDisplay connection
+     * @param sync The EGLSync to fetch the SyncFence from
+     * @return A SyncFence representing the native fence.
+     *       * If <sync> is not a valid sync object for <display>,
+     *         an {@link SyncFence#isValid() invalid} SyncFence is returned and an EGL_BAD_PARAMETER
+     *         error is generated.
+     *       * If the EGL_SYNC_NATIVE_FENCE_FD_ANDROID attribute of <sync> is
+     *         EGL_NO_NATIVE_FENCE_FD_ANDROID, an {@link SyncFence#isValid() invalid} SyncFence is
+     *         returned and an EGL_BAD_PARAMETER error is generated.
+     *       * If <display> does not match the display passed to eglCreateSync
+     *         when <sync> was created, the behaviour is undefined.
+     */
+    public static @NonNull SyncFence eglDupNativeFenceFDANDROID(@NonNull EGLDisplay display,
+            @NonNull EGLSync sync) {
+        int fd = eglDupNativeFenceFDANDROIDImpl(display, sync);
+        Log.d("EGL", "eglDupNativeFence returned " + fd);
+        if (fd >= 0) {
+            return SyncFence.create(ParcelFileDescriptor.adoptFd(fd));
+        } else {
+            return SyncFence.createEmpty();
+        }
+    }
+
+    private static native int eglDupNativeFenceFDANDROIDImpl(EGLDisplay display, EGLSync sync);
+
diff --git a/opengl/tools/glgen/stubs/egl/EGLExtcHeader.cpp b/opengl/tools/glgen/stubs/egl/EGLExtcHeader.cpp
index be8b3e3..f1f0ac5 100644
--- a/opengl/tools/glgen/stubs/egl/EGLExtcHeader.cpp
+++ b/opengl/tools/glgen/stubs/egl/EGLExtcHeader.cpp
@@ -17,6 +17,7 @@
 // This source file is automatically generated
 
 #pragma GCC diagnostic ignored "-Wunused-variable"
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
 #pragma GCC diagnostic ignored "-Wunused-function"
 
 #include "jni.h"
@@ -37,25 +38,12 @@
 #include <ui/ANativeObjectBase.h>
 
 static jclass egldisplayClass;
-static jclass eglcontextClass;
 static jclass eglsurfaceClass;
-static jclass eglconfigClass;
+static jclass eglsyncClass;
 
 static jmethodID egldisplayGetHandleID;
-static jmethodID eglcontextGetHandleID;
 static jmethodID eglsurfaceGetHandleID;
-static jmethodID eglconfigGetHandleID;
-
-static jmethodID egldisplayConstructor;
-static jmethodID eglcontextConstructor;
-static jmethodID eglsurfaceConstructor;
-static jmethodID eglconfigConstructor;
-
-static jobject eglNoContextObject;
-static jobject eglNoDisplayObject;
-static jobject eglNoSurfaceObject;
-
-
+static jmethodID eglsyncGetHandleID;
 
 /* Cache method IDs each time the class is loaded. */
 
@@ -64,37 +52,14 @@
 {
     jclass egldisplayClassLocal = _env->FindClass("android/opengl/EGLDisplay");
     egldisplayClass = (jclass) _env->NewGlobalRef(egldisplayClassLocal);
-    jclass eglcontextClassLocal = _env->FindClass("android/opengl/EGLContext");
-    eglcontextClass = (jclass) _env->NewGlobalRef(eglcontextClassLocal);
     jclass eglsurfaceClassLocal = _env->FindClass("android/opengl/EGLSurface");
     eglsurfaceClass = (jclass) _env->NewGlobalRef(eglsurfaceClassLocal);
-    jclass eglconfigClassLocal = _env->FindClass("android/opengl/EGLConfig");
-    eglconfigClass = (jclass) _env->NewGlobalRef(eglconfigClassLocal);
+    jclass eglsyncClassLocal = _env->FindClass("android/opengl/EGLSync");
+    eglsyncClass = (jclass) _env->NewGlobalRef(eglsyncClassLocal);
 
     egldisplayGetHandleID = _env->GetMethodID(egldisplayClass, "getNativeHandle", "()J");
-    eglcontextGetHandleID = _env->GetMethodID(eglcontextClass, "getNativeHandle", "()J");
     eglsurfaceGetHandleID = _env->GetMethodID(eglsurfaceClass, "getNativeHandle", "()J");
-    eglconfigGetHandleID = _env->GetMethodID(eglconfigClass, "getNativeHandle", "()J");
-
-
-    egldisplayConstructor = _env->GetMethodID(egldisplayClass, "<init>", "(J)V");
-    eglcontextConstructor = _env->GetMethodID(eglcontextClass, "<init>", "(J)V");
-    eglsurfaceConstructor = _env->GetMethodID(eglsurfaceClass, "<init>", "(J)V");
-    eglconfigConstructor = _env->GetMethodID(eglconfigClass, "<init>", "(J)V");
-
-
-    jclass eglClass = _env->FindClass("android/opengl/EGL14");
-    jfieldID noContextFieldID = _env->GetStaticFieldID(eglClass, "EGL_NO_CONTEXT", "Landroid/opengl/EGLContext;");
-    jobject localeglNoContextObject = _env->GetStaticObjectField(eglClass, noContextFieldID);
-    eglNoContextObject = _env->NewGlobalRef(localeglNoContextObject);
-
-    jfieldID noDisplayFieldID = _env->GetStaticFieldID(eglClass, "EGL_NO_DISPLAY", "Landroid/opengl/EGLDisplay;");
-    jobject localeglNoDisplayObject = _env->GetStaticObjectField(eglClass, noDisplayFieldID);
-    eglNoDisplayObject = _env->NewGlobalRef(localeglNoDisplayObject);
-
-    jfieldID noSurfaceFieldID = _env->GetStaticFieldID(eglClass, "EGL_NO_SURFACE", "Landroid/opengl/EGLSurface;");
-    jobject localeglNoSurfaceObject = _env->GetStaticObjectField(eglClass, noSurfaceFieldID);
-    eglNoSurfaceObject = _env->NewGlobalRef(localeglNoSurfaceObject);
+    eglsyncGetHandleID = _env->GetMethodID(eglsyncClass, "getNativeHandle", "()J");
 }
 
 static void *
@@ -108,24 +73,12 @@
     return reinterpret_cast<void*>(_env->CallLongMethod(obj, mid));
 }
 
-static jobject
-toEGLHandle(JNIEnv *_env, jclass cls, jmethodID con, void * handle) {
-    if (cls == eglcontextClass &&
-       (EGLContext)handle == EGL_NO_CONTEXT) {
-           return eglNoContextObject;
-    }
+// TODO: this should be generated from the .spec file, but needs to be renamed and made private
+static jint android_eglDupNativeFenceFDANDROID(JNIEnv *env, jobject, jobject dpy, jobject sync) {
+    EGLDisplay dpy_native = (EGLDisplay)fromEGLHandle(env, egldisplayGetHandleID, dpy);
+    EGLSync sync_native = (EGLSync)fromEGLHandle(env, eglsyncGetHandleID, sync);
 
-    if (cls == egldisplayClass &&
-       (EGLDisplay)handle == EGL_NO_DISPLAY) {
-           return eglNoDisplayObject;
-    }
-
-    if (cls == eglsurfaceClass &&
-       (EGLSurface)handle == EGL_NO_SURFACE) {
-           return eglNoSurfaceObject;
-    }
-
-    return _env->NewObject(cls, con, reinterpret_cast<jlong>(handle));
+    return eglDupNativeFenceFDANDROID(dpy_native, sync_native);
 }
 
 // --------------------------------------------------------------------------
diff --git a/opengl/tools/glgen/stubs/egl/eglGetDisplay.java b/opengl/tools/glgen/stubs/egl/eglGetDisplay.java
index 85f743d..78b0819 100755
--- a/opengl/tools/glgen/stubs/egl/eglGetDisplay.java
+++ b/opengl/tools/glgen/stubs/egl/eglGetDisplay.java
@@ -7,7 +7,7 @@
     /**
      * {@hide}
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     public static native EGLDisplay eglGetDisplay(
         long display_id
     );
diff --git a/opengl/tools/glgen/stubs/gles11/GLES10ExtcHeader.cpp b/opengl/tools/glgen/stubs/gles11/GLES10ExtcHeader.cpp
index dd17ca4..1fa9275 100644
--- a/opengl/tools/glgen/stubs/gles11/GLES10ExtcHeader.cpp
+++ b/opengl/tools/glgen/stubs/gles11/GLES10ExtcHeader.cpp
@@ -18,6 +18,7 @@
 // This source file is automatically generated
 
 #pragma GCC diagnostic ignored "-Wunused-variable"
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
 #pragma GCC diagnostic ignored "-Wunused-function"
 
 #include <GLES/gl.h>
diff --git a/opengl/tools/glgen/stubs/gles11/GLES10cHeader.cpp b/opengl/tools/glgen/stubs/gles11/GLES10cHeader.cpp
index dd17ca4..1fa9275 100644
--- a/opengl/tools/glgen/stubs/gles11/GLES10cHeader.cpp
+++ b/opengl/tools/glgen/stubs/gles11/GLES10cHeader.cpp
@@ -18,6 +18,7 @@
 // This source file is automatically generated
 
 #pragma GCC diagnostic ignored "-Wunused-variable"
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
 #pragma GCC diagnostic ignored "-Wunused-function"
 
 #include <GLES/gl.h>
diff --git a/opengl/tools/glgen/stubs/gles11/GLES11ExtcHeader.cpp b/opengl/tools/glgen/stubs/gles11/GLES11ExtcHeader.cpp
index dd17ca4..1fa9275 100644
--- a/opengl/tools/glgen/stubs/gles11/GLES11ExtcHeader.cpp
+++ b/opengl/tools/glgen/stubs/gles11/GLES11ExtcHeader.cpp
@@ -18,6 +18,7 @@
 // This source file is automatically generated
 
 #pragma GCC diagnostic ignored "-Wunused-variable"
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
 #pragma GCC diagnostic ignored "-Wunused-function"
 
 #include <GLES/gl.h>
diff --git a/opengl/tools/glgen/stubs/gles11/GLES11cHeader.cpp b/opengl/tools/glgen/stubs/gles11/GLES11cHeader.cpp
index dd17ca4..1fa9275 100644
--- a/opengl/tools/glgen/stubs/gles11/GLES11cHeader.cpp
+++ b/opengl/tools/glgen/stubs/gles11/GLES11cHeader.cpp
@@ -18,6 +18,7 @@
 // This source file is automatically generated
 
 #pragma GCC diagnostic ignored "-Wunused-variable"
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
 #pragma GCC diagnostic ignored "-Wunused-function"
 
 #include <GLES/gl.h>
diff --git a/opengl/tools/glgen/stubs/gles11/GLES20cHeader.cpp b/opengl/tools/glgen/stubs/gles11/GLES20cHeader.cpp
index b2bbdf6..4004a7d 100644
--- a/opengl/tools/glgen/stubs/gles11/GLES20cHeader.cpp
+++ b/opengl/tools/glgen/stubs/gles11/GLES20cHeader.cpp
@@ -18,6 +18,7 @@
 // This source file is automatically generated
 
 #pragma GCC diagnostic ignored "-Wunused-variable"
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
 #pragma GCC diagnostic ignored "-Wunused-function"
 
 #include <GLES2/gl2.h>
diff --git a/opengl/tools/glgen/stubs/gles11/GLES30cHeader.cpp b/opengl/tools/glgen/stubs/gles11/GLES30cHeader.cpp
index b039bc9..c5bdf32 100644
--- a/opengl/tools/glgen/stubs/gles11/GLES30cHeader.cpp
+++ b/opengl/tools/glgen/stubs/gles11/GLES30cHeader.cpp
@@ -18,6 +18,7 @@
 // This source file is automatically generated
 
 #pragma GCC diagnostic ignored "-Wunused-variable"
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
 #pragma GCC diagnostic ignored "-Wunused-function"
 
 #include <GLES3/gl3.h>
diff --git a/opengl/tools/glgen/stubs/gles11/GLES31ExtcHeader.cpp b/opengl/tools/glgen/stubs/gles11/GLES31ExtcHeader.cpp
index dd00e92..2260a80 100644
--- a/opengl/tools/glgen/stubs/gles11/GLES31ExtcHeader.cpp
+++ b/opengl/tools/glgen/stubs/gles11/GLES31ExtcHeader.cpp
@@ -17,6 +17,7 @@
 // This source file is automatically generated
 
 #pragma GCC diagnostic ignored "-Wunused-variable"
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
 #pragma GCC diagnostic ignored "-Wunused-function"
 
 #include <GLES3/gl31.h>
diff --git a/opengl/tools/glgen/stubs/gles11/GLES31cHeader.cpp b/opengl/tools/glgen/stubs/gles11/GLES31cHeader.cpp
index 88e00be..130612d 100644
--- a/opengl/tools/glgen/stubs/gles11/GLES31cHeader.cpp
+++ b/opengl/tools/glgen/stubs/gles11/GLES31cHeader.cpp
@@ -17,6 +17,7 @@
 // This source file is automatically generated
 
 #pragma GCC diagnostic ignored "-Wunused-variable"
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
 #pragma GCC diagnostic ignored "-Wunused-function"
 
 #include <stdint.h>
diff --git a/opengl/tools/glgen/stubs/gles11/GLES32cHeader.cpp b/opengl/tools/glgen/stubs/gles11/GLES32cHeader.cpp
index 3e7ec8b..5446fc2 100644
--- a/opengl/tools/glgen/stubs/gles11/GLES32cHeader.cpp
+++ b/opengl/tools/glgen/stubs/gles11/GLES32cHeader.cpp
@@ -17,6 +17,7 @@
 // This source file is automatically generated
 
 #pragma GCC diagnostic ignored "-Wunused-variable"
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
 #pragma GCC diagnostic ignored "-Wunused-function"
 
 #include <stdint.h>
diff --git a/opengl/tools/glgen/stubs/jsr239/GLCHeader.cpp b/opengl/tools/glgen/stubs/jsr239/GLCHeader.cpp
index 9cab1d6..c3534bf 100644
--- a/opengl/tools/glgen/stubs/jsr239/GLCHeader.cpp
+++ b/opengl/tools/glgen/stubs/jsr239/GLCHeader.cpp
@@ -17,6 +17,7 @@
 // This source file is automatically generated
 
 #pragma GCC diagnostic ignored "-Wunused-variable"
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
 #pragma GCC diagnostic ignored "-Wunused-function"
 
 #include "jni.h"