From f9bf67af85728f5207b02a3f99d950af83020bc3 Mon Sep 17 00:00:00 2001
From: Michael Brasser <michael.brasser@live.com>
Date: Mon, 4 Mar 2013 20:20:15 -0600
Subject: [PATCH] Introduce QML_FBO_FLUSH_BEFORE_DETACH to work around FBO
 issue.

On some AMD hardware, detaching the depth attachment immediately after
rendering to an FBO will cause rendering issues. Adding an explicit
glFlush before detaching seems to work around the issue.

Task-number: QTBUG-29265
Change-Id: I97c7b87c1c3d3a69a4d6228dd9459745710c5f4c
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>
---
 src/quick/items/qquickshadereffectsource.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/quick/items/qquickshadereffectsource.cpp b/src/quick/items/qquickshadereffectsource.cpp
index bdfef7c..cab3692 100644
--- a/src/quick/items/qquickshadereffectsource.cpp
+++ b/src/quick/items/qquickshadereffectsource.cpp
@@ -53,6 +53,7 @@
 QT_BEGIN_NAMESPACE
 
 DEFINE_BOOL_CONFIG_OPTION(qmlFboOverlay, QML_FBO_OVERLAY)
+DEFINE_BOOL_CONFIG_OPTION(qmlFboFlushBeforeDetach, QML_FBO_FLUSH_BEFORE_DETACH)
 
 namespace
 {
@@ -75,6 +76,8 @@ namespace
 
     BindableFbo::~BindableFbo()
     {
+        if (qmlFboFlushBeforeDetach())
+            glFlush();
         if (m_depthStencil)
             m_depthStencil->detach();
     }
-- 
2.7.4