--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.desktop/macosx/classes/sun/java2d/metal/MTLVolatileSurfaceManager.java	Fri Jun 21 12:08:37 2019 +0530
@@ -0,0 +1,146 @@
+/*
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package sun.java2d.metal;
+
+import sun.awt.AWTAccessor;
+import sun.awt.AWTAccessor.ComponentAccessor;
+import sun.awt.image.SunVolatileImage;
+import sun.awt.image.VolatileSurfaceManager;
+import sun.java2d.BackBufferCapsProvider;
+import sun.java2d.SurfaceData;
+import sun.java2d.opengl.OGLSurfaceData;
+import sun.java2d.pipe.hw.ExtendedBufferCapabilities;
+
+import java.awt.*;
+import java.awt.image.ColorModel;
+import java.awt.peer.ComponentPeer;
+
+import static java.awt.BufferCapabilities.FlipContents.COPIED;
+//import static sun.java2d.opengl.OGLContext.OGLContextCaps.CAPS_EXT_FBOBJECT;
+import static sun.java2d.pipe.hw.ExtendedBufferCapabilities.VSyncType.VSYNC_ON;
+
+public class MTLVolatileSurfaceManager extends VolatileSurfaceManager {
+
+    private final boolean accelerationEnabled;
+
+    public MTLVolatileSurfaceManager(SunVolatileImage vImg, Object context) {
+        super(vImg, context);
+
+        /*
+         * We will attempt to accelerate this image only under the
+         * following conditions:
+         *   - the image is not bitmask AND the GraphicsConfig supports the FBO
+         *     extension
+         */
+        int transparency = vImg.getTransparency();
+        MTLGraphicsConfig gc = (MTLGraphicsConfig) vImg.getGraphicsConfig();
+        accelerationEnabled = true;
+                //gc.isCapPresent(CAPS_EXT_FBOBJECT)
+                //&& transparency != Transparency.BITMASK;
+    }
+
+    protected boolean isAccelerationEnabled() {
+        return accelerationEnabled;
+    }
+
+    /**
+     * Create a FBO-based SurfaceData object (or init the backbuffer
+     * of an existing window if this is a double buffered GraphicsConfig)
+     */
+    protected SurfaceData initAcceleratedSurface() {
+        SurfaceData sData = null;
+        Component comp = vImg.getComponent();
+        final ComponentAccessor acc = AWTAccessor.getComponentAccessor();
+        final ComponentPeer peer = (comp != null) ? acc.getPeer(comp) : null;
+
+        try {
+            boolean createVSynced = false;
+            boolean forceback = false;
+            if (context instanceof Boolean) {
+                forceback = ((Boolean)context).booleanValue();
+                if (forceback && peer instanceof BackBufferCapsProvider) {
+                    BackBufferCapsProvider provider =
+                        (BackBufferCapsProvider)peer;
+                    BufferCapabilities caps = provider.getBackBufferCaps();
+                    if (caps instanceof ExtendedBufferCapabilities) {
+                        ExtendedBufferCapabilities ebc =
+                            (ExtendedBufferCapabilities)caps;
+                        if (ebc.getVSync() == VSYNC_ON &&
+                            ebc.getFlipContents() == COPIED)
+                        {
+                            createVSynced = true;
+                            forceback = false;
+                        }
+                    }
+                }
+            }
+
+            if (forceback) {
+                // peer must be non-null in this case
+                // TODO: modify parameter to delegate
+                //                sData = MTLSurfaceData.createData(peer, vImg, FLIP_BACKBUFFER);
+            } else {
+                MTLGraphicsConfig gc =
+                    (MTLGraphicsConfig)vImg.getGraphicsConfig();
+                ColorModel cm = gc.getColorModel(vImg.getTransparency());
+                int type = vImg.getForcedAccelSurfaceType();
+                // if acceleration type is forced (type != UNDEFINED) then
+                // use the forced type, otherwise choose RT_TEXTURE
+                if (type == OGLSurfaceData.UNDEFINED) {
+                    type = OGLSurfaceData.FBOBJECT;
+                }
+                if (createVSynced) {
+                    // TODO: modify parameter to delegate
+//                  sData = MTLSurfaceData.createData(peer, vImg, type);
+                } else {
+                    sData = MTLSurfaceData.createData(gc,
+                                                      vImg.getWidth(),
+                                                      vImg.getHeight(),
+                                                      cm, vImg, type);
+                }
+            }
+        } catch (NullPointerException ex) {
+            sData = null;
+        } catch (OutOfMemoryError er) {
+            sData = null;
+        }
+
+        return sData;
+    }
+
+    @Override
+    protected boolean isConfigValid(GraphicsConfiguration gc) {
+        return ((gc == null) || (gc == vImg.getGraphicsConfig()));
+    }
+
+    @Override
+    public void initContents() {
+        if (vImg.getForcedAccelSurfaceType() != OGLSurfaceData.TEXTURE) {
+            super.initContents();
+        }
+    }
+}
+