Commit 341d4f90 authored by Martin Flöser's avatar Martin Flöser

Sync before painting in EGL backend

This should help preventing flickering/tearing with various
ES drivers.
Thanks to Jammy Zhou for pointing out this problem and providing
the patch.
parent 192d53a1
......@@ -174,6 +174,7 @@ void SceneOpenGL::paint(QRegion damage, ToplevelList toplevels)
stacking_order.append(windows[ c ]);
XSync(display(), false);
int mask = 0;
paintScreen(&mask, &damage); // call generic implementation
ungrabXServer(); // ungrab before flushBuffer(), it may wait for vsync
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