Reset the bad-vsync counters on window resize

OpenGL implementations such as NVIDIA on Windows (but presumably others
as well) break the presentation rate when resizing a window. D3D and
Vulkan would stick closely to the normal rate. In any case, resetting
the counters on a resize is a good idea because we do not really care
about inconsistencies during a resize.

Change-Id: I173daf8a7aefca3d24779102b9354c923478d424
Reviewed-by: Christian Strømme <christian.stromme@qt.io>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/quick/scenegraph/qsgthreadedrenderloop.cpp b/src/quick/scenegraph/qsgthreadedrenderloop.cpp
index 743ff3b009..e79d21dcb1 100644
--- a/src/quick/scenegraph/qsgthreadedrenderloop.cpp
+++ b/src/quick/scenegraph/qsgthreadedrenderloop.cpp
@@ -1151,6 +1151,17 @@ void QSGThreadedRenderLoop::hide(QQuickWindow *window)
     releaseResources(window);
 }
 
+void QSGThreadedRenderLoop::resize(QQuickWindow *window)
+{
+    qCDebug(QSG_LOG_RENDERLOOP) << "reisze()" << window;
+
+    Window *w = windowFor(m_windows, window);
+    if (!w)
+        return;
+
+    w->psTimeAccumulator = 0.0f;
+    w->psTimeSampleCount = 0;
+}
 
 /*
     If the window is first hide it, then perform a complete cleanup