QSGContext::defaultSurfaceFormat() should be double-buffered

The problem was that if the opengl driver is single-buffered
by default it will remain so.
The scene graph really want double-buffered rendering.

Change-Id: Ie80f71276d1dd1304c75170f3ca17e585800e8b8
Reviewed-by: Kim M. Kalland <kim.kalland@nokia.com>

diff --git a/src/quick/scenegraph/qsgcontext.cpp b/src/quick/scenegraph/qsgcontext.cpp
index ed6a75d..0d6ddb5 100644 (file)
--- a/src/quick/scenegraph/qsgcontext.cpp
+++ b/src/quick/scenegraph/qsgcontext.cpp
@@ -378,6 +378,7 @@ QSurfaceFormat QSGContext::defaultSurfaceFormat() const
     QSurfaceFormat format;
     format.setDepthBufferSize(24);
     format.setStencilBufferSize(8);
+    format.setSwapBehavior(QSurfaceFormat::DoubleBuffer);
     return format;
 }