Warn if eglSwapBuffers fail

This failing was the cause of windows freezing on NVidia. If it happens
for some other reason we can now see why.

Pick-to: 6.6
Change-Id: Iabd44b1b3f73a54adac3024436ffe116ca15d21a
Reviewed-by: David Edmundson <davidedmundson@kde.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/hardwareintegration/client/wayland-egl/qwaylandglcontext.cpp b/src/hardwareintegration/client/wayland-egl/qwaylandglcontext.cpp
index 050b3eba3..e10b89813 100644
--- a/src/hardwareintegration/client/wayland-egl/qwaylandglcontext.cpp
+++ b/src/hardwareintegration/client/wayland-egl/qwaylandglcontext.cpp
@@ -372,7 +372,8 @@ void QWaylandGLContext::swapBuffers(QPlatformSurface *surface)
         window->waitForFrameSync(100);
     }
     window->handleUpdate();
-    eglSwapBuffers(eglDisplay(), eglSurface);
+    if (!eglSwapBuffers(eglDisplay(), eglSurface))
+        qCWarning(lcQpaWayland, "eglSwapBuffers failed with %#x, surface: %p", eglGetError(), eglSurface);
 
     window->setCanResize(true);
 }