WRenderBufferNode: Supports use depth buffer

Author: zccrs

src/server/qtquick/private/wrenderbuffernode.cpp

@@ -404,7 +404,11 @@ class Q_DECL_HIDDEN RhiManager : public DataManager<RhiManager, void>
         m_rhi->offscreenSurface = fallbackSurface.release();
 
         context = QQuickWindowPrivate::get(owner)->context;
-        renderer = context->createRenderer(QSGRendererInterface::RenderMode2DNoDepthBuffer);
+        auto dr = qobject_cast<QSGDefaultRenderContext*>(context);
+        const bool useDepth = dr ? dr->useDepthBufferFor2D() : false;
+        const auto renderMode = useDepth ? QSGRendererInterface::RenderMode2D
+                                         : QSGRendererInterface::RenderMode2DNoDepthBuffer;
+        renderer = context->createRenderer(renderMode);
     }
 
     ~RhiManager() {