Restore depth buffer usage when last render node is removed

Adding a QSGRenderNode to the scene permanently disabled opaque batches
by disabling depth buffer usage. Reset the depth buffer usage to the
default value once last QSGRenderNode has been removed from the scene.

Change-Id: I760afde83ae9eaaf1b5571c37fd0081eb23b1f20
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/quick/scenegraph/coreapi/qsgbatchrenderer.cpp b/src/quick/scenegraph/coreapi/qsgbatchrenderer.cpp
index 886e614620..32309c219a 100644
--- a/src/quick/scenegraph/coreapi/qsgbatchrenderer.cpp
+++ b/src/quick/scenegraph/coreapi/qsgbatchrenderer.cpp
@@ -1081,6 +1081,9 @@ void Renderer::nodeWasRemoved(Node *node)
         if (e) {
             e->removed = true;
             m_elementsToDelete.add(e);
+
+            if (m_renderNodeElements.isEmpty())
+                m_useDepthBuffer = context()->openglContext()->format().depthBufferSize() > 0;
         }
     }