From 1077e4dca34d63540d3aa45cd6d74e55f27bce7c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C3=ABl=20Lemaire?= <michael@thunderk.net>
Date: Mon, 24 Aug 2015 19:38:59 +0200
Subject: [PATCH] Fixed OpenGL viewport being updated at each frame

That could cause ratio flickering on paint() on some devices
---
 src/interface/modeler/quickapp/OpenGLView.cpp | 15 ++++++++++++++-
 src/interface/modeler/quickapp/OpenGLView.h   |  2 ++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/interface/modeler/quickapp/OpenGLView.cpp b/src/interface/modeler/quickapp/OpenGLView.cpp
index cc828e6..e1a90f8 100644
--- a/src/interface/modeler/quickapp/OpenGLView.cpp
+++ b/src/interface/modeler/quickapp/OpenGLView.cpp
@@ -18,6 +18,8 @@ OpenGLView::OpenGLView(QQuickItem *parent) :
     mouse_button = Qt::NoButton;
 
     connect(this, SIGNAL(windowChanged(QQuickWindow*)), this, SLOT(handleWindowChanged(QQuickWindow*)));
+    connect(this, SIGNAL(widthChanged()), this, SLOT(handleResize()));
+    connect(this, SIGNAL(heightChanged()), this, SLOT(handleResize()));
     startTimer(50);
 }
 
@@ -45,9 +47,15 @@ void OpenGLView::paint()
     {
         renderer->initialize();
         initialized = true;
+        resized = true;
+    }
+
+    if (resized)
+    {
+        renderer->resize(width(), height());
+        resized = false;
     }
 
-    renderer->resize(width(), height());
     renderer->prepareOpenGLState();
     renderer->paint();
 
@@ -57,6 +65,11 @@ void OpenGLView::paint()
     }
 }
 
+void OpenGLView::handleResize()
+{
+    resized = true;
+}
+
 void OpenGLView::wheelEvent(QWheelEvent *event)
 {
     if (not acceptInputs())
diff --git a/src/interface/modeler/quickapp/OpenGLView.h b/src/interface/modeler/quickapp/OpenGLView.h
index 5a6fc99..58f2075 100644
--- a/src/interface/modeler/quickapp/OpenGLView.h
+++ b/src/interface/modeler/quickapp/OpenGLView.h
@@ -17,6 +17,7 @@ public:
 public slots:
     void handleWindowChanged(QQuickWindow *win);
     void paint();
+    void handleResize();
 
 protected:
     virtual void wheelEvent(QWheelEvent *event) override;
@@ -31,6 +32,7 @@ private:
 
 private:
     bool initialized;
+    bool resized;
     MainModelerWindow *window;
     OpenGLRenderer *renderer;