macOS: Move QCocoaGLContext initialization into dedicated method

Change-Id: I9dc2c400c3d26e9fcfaac04b61c1503229f59dba
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

src/plugins/platforms/cocoa/qcocoaglcontext.h

@@ -56,6 +56,8 @@ public:
     QCocoaGLContext(QOpenGLContext *context);
     ~QCocoaGLContext();
 
+    void initialize() override;
+
     bool makeCurrent(QPlatformSurface *surface) override;
     void swapBuffers(QPlatformSurface *surface) override;
     void doneCurrent() override;

src/plugins/platforms/cocoa/qcocoaglcontext.mm

@@ -76,9 +76,14 @@ QT_BEGIN_NAMESPACE
 Q_LOGGING_CATEGORY(lcQpaOpenGLContext, "qt.qpa.openglcontext", QtWarningMsg);
 
 QCocoaGLContext::QCocoaGLContext(QOpenGLContext *context)
-    : QPlatformOpenGLContext(), m_format(context->format())
+    : QPlatformOpenGLContext()
+    , m_format(context->format())
 {
-    QVariant nativeHandle = context->nativeHandle();
+}
+
+void QCocoaGLContext::initialize()
+{
+    QVariant nativeHandle = context()->nativeHandle();
     if (!nativeHandle.isNull()) {
         if (!nativeHandle.canConvert<QCocoaNativeContext>()) {
             qCWarning(lcQpaOpenGLContext, "QOpenGLContext native handle must be a QCocoaNativeContext");
@@ -95,7 +100,7 @@ QCocoaGLContext::QCocoaGLContext(QOpenGLContext *context)
         // Note: We have no way of knowing whether the NSOpenGLContext was created with the
         // share context as reported by the QOpenGLContext, but we just have to trust that
         // it was. It's okey, as the only thing we're using it for is to report isShared().
-        if (QPlatformOpenGLContext *shareContext = context->shareHandle())
+        if (QPlatformOpenGLContext *shareContext = context()->shareHandle())
             m_shareContext = static_cast<QCocoaGLContext *>(shareContext)->nativeContext();
 
         updateSurfaceFormat();
@@ -110,7 +115,7 @@ QCocoaGLContext::QCocoaGLContext(QOpenGLContext *context)
     if (m_format.renderableType() != QSurfaceFormat::OpenGL)
         return;
 
-    if (QPlatformOpenGLContext *shareContext = context->shareHandle()) {
+    if (QPlatformOpenGLContext *shareContext = context()->shareHandle()) {
         m_shareContext = static_cast<QCocoaGLContext *>(shareContext)->nativeContext();
 
         // Allow sharing between 3.2 Core and 4.1 Core profile versions in
@@ -150,6 +155,9 @@ QCocoaGLContext::QCocoaGLContext(QOpenGLContext *context)
         return;
     }
 
+    // The native handle should reflect the underlying context, even if we created it
+    context()->setNativeHandle(QVariant::fromValue<QCocoaNativeContext>(m_context));
+
     // --------------------- Set NSOpenGLContext properties ---------------------
 
     const GLint interval = m_format.swapInterval() >= 0 ? m_format.swapInterval() : 1;

src/plugins/platforms/cocoa/qcocoaintegration.mm

@@ -418,9 +418,7 @@ QPlatformOffscreenSurface *QCocoaIntegration::createPlatformOffscreenSurface(QOf
 #ifndef QT_NO_OPENGL
 QPlatformOpenGLContext *QCocoaIntegration::createPlatformOpenGLContext(QOpenGLContext *context) const
 {
-    QCocoaGLContext *glContext = new QCocoaGLContext(context);
-    context->setNativeHandle(QVariant::fromValue<QCocoaNativeContext>(glContext->nativeContext()));
-    return glContext;
+    return new QCocoaGLContext(context);
 }
 #endif