Handle context loss in the threaded render loop

Change-Id: I3f9219dd2fed15094c2f7d670a981406e601959b
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/quick/scenegraph/qsgthreadedrenderloop.cpp b/src/quick/scenegraph/qsgthreadedrenderloop.cpp
index 6974271dc7..e1a54810b7 100644
--- a/src/quick/scenegraph/qsgthreadedrenderloop.cpp
+++ b/src/quick/scenegraph/qsgthreadedrenderloop.cpp
@@ -490,6 +490,14 @@ void QSGRenderThread::sync(bool inExpose)
     bool current = false;
     if (windowSize.width() > 0 && windowSize.height() > 0)
         current = gl->makeCurrent(window);
+    // Check for context loss.
+    if (!current && !gl->isValid()) {
+        QQuickWindowPrivate::get(window)->cleanupNodesOnShutdown();
+        sgrc->invalidate();
+        current = gl->create() && gl->makeCurrent(window);
+        if (current)
+            sgrc->initialize(gl);
+    }
     if (current) {
         QQuickWindowPrivate *d = QQuickWindowPrivate::get(window);
         bool hadRenderer = d->renderer != 0;
@@ -571,6 +579,12 @@ void QSGRenderThread::syncAndRender()
     bool current = false;
     if (d->renderer && windowSize.width() > 0 && windowSize.height() > 0)
         current = gl->makeCurrent(window);
+    // Check for context loss.
+    if (!current && !gl->isValid()) {
+        // Cannot do anything here because gui is not locked. Request a new
+        // sync+render round on the gui thread and let the sync handle it.
+        QCoreApplication::postEvent(window, new QEvent(QEvent::Type(QQuickWindowPrivate::FullUpdateRequest)));
+    }
     if (current) {
         d->renderSceneGraph(windowSize);
         if (profileFrames)