--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.desktop/macosx/classes/sun/java2d/metal/MetalLayer.java	Wed Feb 20 17:00:40 2019 +0530
@@ -0,0 +1,173 @@
+/*
+ * Copyright (c) 2019, 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.lwawt.LWWindowPeer;
+import sun.lwawt.macosx.CFRetainedResource;
+import sun.java2d.SurfaceData;
+import sun.java2d.NullSurfaceData;
+
+import java.awt.*;
+
+import sun.awt.CGraphicsConfig;
+import sun.java2d.metal.MetalGraphicsConfig;
+
+public class MetalLayer extends CFRetainedResource {
+
+    private native long nativeCreateLayer();
+    private native long nativeInitLayer(long deviceInfo, long layer);
+    //private native long nativeValidate(long layer, long view);
+    //private native long nativeDraw(long layer);
+    private static native void validate(long layerPtr, MetalSurfaceData msd);
+    private static native void nativeSetScale(long layerPtr, double scale);
+    //private static native void nativeSetScale(long layerPtr, double scale);
+    //private static native void blitTexture(long layerPtr);
+
+    private LWWindowPeer peer;
+    private int scale = 1;
+    private SurfaceData surfaceData; // represents intermediate buffer (texture)
+    private long pNativeLayer;
+
+    public MetalLayer(LWWindowPeer peer) {
+        super(0, true);
+
+        pNativeLayer = nativeCreateLayer();
+        setPtr(pNativeLayer);
+        this.peer = peer;
+
+        // TODO : No need to initialize layer here, it will be done
+        // when we initialize surface in MetalSurfaceData.
+        MetalGraphicsConfig gc = (MetalGraphicsConfig)getGraphicsConfiguration();
+        nativeInitLayer(gc.pConfigInfo, pNativeLayer);
+    }
+
+     public long getPointer() {
+        return ptr;
+    }
+
+
+    public Rectangle getBounds() {
+        return peer.getBounds();
+    }
+
+    public GraphicsConfiguration getGraphicsConfiguration() {
+        return peer.getGraphicsConfiguration();
+    }
+
+    public boolean isOpaque() {
+        return !peer.isTranslucent();
+    }
+
+    public int getTransparency() {
+        return isOpaque() ? Transparency.OPAQUE : Transparency.TRANSLUCENT;
+    }
+
+    public Object getDestination() {
+        return peer.getTarget();
+    }
+    
+    public SurfaceData replaceSurfaceData() {
+        if (getBounds().isEmpty()) {
+            surfaceData = NullSurfaceData.theInstance;
+            return surfaceData;
+        }
+
+        // the layer redirects all painting to the buffer's graphics
+        // and blits the buffer to the layer surface (in drawInCGLContext callback)
+        CGraphicsConfig gc = (CGraphicsConfig)getGraphicsConfiguration();
+        surfaceData = gc.createSurfaceData(this);
+
+        setScale(gc.getDevice().getScaleFactor());
+
+        // the layer holds a reference to the buffer, which in
+        // turn has a reference back to this layer
+        if (surfaceData instanceof MetalSurfaceData) {
+            validate((MetalSurfaceData)surfaceData);
+        }
+
+        return surfaceData;
+       
+    } 
+
+    public SurfaceData getSurfaceData() {
+        return surfaceData;
+    }
+
+    /*public void validate(long viewPtr) {
+        //OGLRenderQueue rq = OGLRenderQueue.getInstance();
+        //rq.lock();
+        try {
+            execute(ptr -> nativeValidate(ptr, viewPtr));
+        } finally {
+            //   rq.unlock();
+        }
+    }*/
+
+    public void validate(final MetalSurfaceData metalsd) {
+        MetalRenderQueue rq = MetalRenderQueue.getInstance();
+        rq.lock();
+        try {
+            execute(ptr -> validate(ptr, metalsd));
+        } finally {
+            rq.unlock();
+        }
+    }
+
+    @Override
+    public void dispose() {
+        // break the connection between the layer and the buffer
+        validate(null);
+        super.dispose();
+    }
+
+    private void setScale(final int _scale) {
+        if (scale != _scale) {
+            scale = _scale;
+            execute(ptr -> nativeSetScale(ptr, scale));
+        }
+    }
+
+    // ----------------------------------------------------------------------
+    // NATIVE CALLBACKS : TODO: check how should this be done in Metal?
+    // ----------------------------------------------------------------------
+
+    public void drawInMetalContext(long viewPtr) {
+        // tell the flusher thread not to update the intermediate buffer
+        // until we are done blitting from it
+        /*OGLRenderQueue rq = OGLRenderQueue.getInstance();
+        rq.lock();
+        try {
+            execute(ptr -> blitTexture(ptr));
+        } finally {
+            rq.unlock();
+        }*/
+        System.out.println("drawInMetalContext method invoked");
+
+        //nativeDraw(pNativeLayer);
+
+    }
+
+}