diff --git a/src/gui/kernel/qopenglcontext.cpp b/src/gui/kernel/qopenglcontext.cpp
index c93752c..b084ae1 100644
--- a/src/gui/kernel/qopenglcontext.cpp
+++ b/src/gui/kernel/qopenglcontext.cpp
@@ -490,6 +490,27 @@ bool QOpenGLContext::create()
 }
 
 /*!
+    Initializes the QOpenGLContext using a platform-specific native context.
+
+    On Mac, provide a CGLContextObj.  The CGLContextObj must not already be attached to an NSOpenGLContext.
+*/
+bool QOpenGLContext::createWithNativeContext(void *nativeContext)
+{
+    destroy();
+
+    Q_D(QOpenGLContext);
+    d->platformGLContext = QGuiApplicationPrivate::platformIntegration()->createPlatformOpenGLContextFromNativeContext(nativeContext);
+    if (!d->platformGLContext)
+        return false;
+    d->platformGLContext->setContext(this);
+    if (!d->platformGLContext->isSharing())
+        d->shareContext = 0;
+    d->shareGroup = d->shareContext ? d->shareContext->shareGroup() : new QOpenGLContextGroup;
+    d->shareGroup->d_func()->addContext(this);
+    return d->platformGLContext;
+}
+
+/*!
     Destroy the underlying platform context associated with this context.
 
     If any other context is directly or indirectly sharing resources with this
diff --git a/src/gui/kernel/qopenglcontext.h b/src/gui/kernel/qopenglcontext.h
index bfdb892..468079c 100644
--- a/src/gui/kernel/qopenglcontext.h
+++ b/src/gui/kernel/qopenglcontext.h
@@ -152,6 +152,7 @@ public:
     void setScreen(QScreen *screen);
 
     bool create();
+    bool createWithNativeContext(void *context);
     bool isValid() const;
 
     QSurfaceFormat format() const;
diff --git a/src/gui/kernel/qplatformintegration.cpp b/src/gui/kernel/qplatformintegration.cpp
index e82e30d..9d372c3 100644
--- a/src/gui/kernel/qplatformintegration.cpp
+++ b/src/gui/kernel/qplatformintegration.cpp
@@ -247,6 +247,13 @@ QPlatformOpenGLContext *QPlatformIntegration::createPlatformOpenGLContext(QOpenG
     qWarning("This plugin does not support createPlatformOpenGLContext!");
     return 0;
 }
+
+QPlatformOpenGLContext *QPlatformIntegration::createPlatformOpenGLContextFromNativeContext(void *nativeContext) const
+{
+    Q_UNUSED(nativeContext);
+    qWarning("This plugin does not support createPlatformOpenGLContextFromNativeContext!");
+    return 0;
+}
 #endif
 
 /*!
diff --git a/src/gui/kernel/qplatformintegration.h b/src/gui/kernel/qplatformintegration.h
index b7a44b1..d466924 100644
--- a/src/gui/kernel/qplatformintegration.h
+++ b/src/gui/kernel/qplatformintegration.h
@@ -103,6 +103,7 @@ public:
     virtual QPlatformBackingStore *createPlatformBackingStore(QWindow *window) const = 0;
 #ifndef QT_NO_OPENGL
     virtual QPlatformOpenGLContext *createPlatformOpenGLContext(QOpenGLContext *context) const;
+    virtual QPlatformOpenGLContext *createPlatformOpenGLContextFromNativeContext(void *nativeContext) const;
 #endif
     virtual QPlatformSharedGraphicsCache *createPlatformSharedGraphicsCache(const char *cacheId) const;
     virtual QPaintEngine *createImagePaintEngine(QPaintDevice *paintDevice) const;
diff --git a/src/plugins/platforms/cocoa/qcocoaglcontext.h b/src/plugins/platforms/cocoa/qcocoaglcontext.h
index 29affb0..5e9364f 100644
--- a/src/plugins/platforms/cocoa/qcocoaglcontext.h
+++ b/src/plugins/platforms/cocoa/qcocoaglcontext.h
@@ -56,6 +56,7 @@ class QCocoaGLContext : public QPlatformOpenGLContext
 {
 public:
     QCocoaGLContext(const QSurfaceFormat &format, QPlatformOpenGLContext *share);
+    QCocoaGLContext(CGLContextObj context);
     ~QCocoaGLContext();
 
     QSurfaceFormat format() const;
diff --git a/src/plugins/platforms/cocoa/qcocoaglcontext.mm b/src/plugins/platforms/cocoa/qcocoaglcontext.mm
index 3dee137..121cf10 100644
--- a/src/plugins/platforms/cocoa/qcocoaglcontext.mm
+++ b/src/plugins/platforms/cocoa/qcocoaglcontext.mm
@@ -84,6 +84,14 @@ QCocoaGLContext::QCocoaGLContext(const QSurfaceFormat &format, QPlatformOpenGLCo
     }
 }
 
+QCocoaGLContext::QCocoaGLContext(CGLContextObj cglContext)
+    : m_context(nil),
+      m_shareContext(nil),
+      m_format()
+{
+    m_context = [[NSOpenGLContext alloc] initWithCGLContextObj:cglContext];
+}
+
 QCocoaGLContext::~QCocoaGLContext()
 {
     [m_context release];
diff --git a/src/plugins/platforms/cocoa/qcocoaintegration.h b/src/plugins/platforms/cocoa/qcocoaintegration.h
index 6e690dd..c3bb823 100644
--- a/src/plugins/platforms/cocoa/qcocoaintegration.h
+++ b/src/plugins/platforms/cocoa/qcocoaintegration.h
@@ -106,6 +106,7 @@ public:
     bool hasCapability(QPlatformIntegration::Capability cap) const;
     QPlatformWindow *createPlatformWindow(QWindow *window) const;
     QPlatformOpenGLContext *createPlatformOpenGLContext(QOpenGLContext *context) const;
+    QPlatformOpenGLContext *createPlatformOpenGLContextFromNativeContext(void *nativeContext) const;
     QPlatformBackingStore *createPlatformBackingStore(QWindow *widget) const;
 
     QAbstractEventDispatcher *guiThreadEventDispatcher() const;
diff --git a/src/plugins/platforms/cocoa/qcocoaintegration.mm b/src/plugins/platforms/cocoa/qcocoaintegration.mm
index 45038ee..714db09 100644
--- a/src/plugins/platforms/cocoa/qcocoaintegration.mm
+++ b/src/plugins/platforms/cocoa/qcocoaintegration.mm
@@ -371,6 +371,11 @@ QPlatformOpenGLContext *QCocoaIntegration::createPlatformOpenGLContext(QOpenGLCo
     return new QCocoaGLContext(context->format(), context->shareHandle());
 }
 
+QPlatformOpenGLContext *QCocoaIntegration::createPlatformOpenGLContextFromNativeContext(void *nativeContext) const
+{
+    return new QCocoaGLContext((CGLContextObj)nativeContext);
+}
+
 QPlatformBackingStore *QCocoaIntegration::createPlatformBackingStore(QWindow *window) const
 {
     return new QCocoaBackingStore(window);