Introduce new platform capability ThreadedOpenGL.

Lets the platform plugin advertise whether it's safe to use OpenGL from
a different thread. With XCB we only advertise this if we have a
reasonably new XCB libary, as older versions suffer from the
xcb_wait_for_reply() blocking bug, which cause GL rendering in a
separate to stall when using Mesa drivers.

Change-Id: I4829df7e583a1c8aed218ae13a159d21266cc594
Reviewed-on: http://codereview.qt.nokia.com/3613
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/plugins/platforms/xcb/qxcbintegration.cpp b/src/plugins/platforms/xcb/qxcbintegration.cpp
index 75936b2771..54394c9193 100644
--- a/src/plugins/platforms/xcb/qxcbintegration.cpp
+++ b/src/plugins/platforms/xcb/qxcbintegration.cpp
@@ -159,6 +159,12 @@ bool QXcbIntegration::hasCapability(QPlatformIntegration::Capability cap) const
     switch (cap) {
     case ThreadedPixmaps: return true;
     case OpenGL: return true;
+    case ThreadedOpenGL:
+#ifdef XCB_POLL_FOR_QUEUED_EVENT
+        return true;
+#else
+        return false;
+#endif
     default: return QPlatformIntegration::hasCapability(cap);
     }
 }