From 759734beb4dd0a3d0e10ca779ede05b016edeae8 Mon Sep 17 00:00:00 2001
From: "Chris Djali (AnyOldName3)" <krizdjali@gmail.com>
Date: Wed, 10 Dec 2025 18:56:45 +0000
Subject: [PATCH] Improve Wayland fractional scaling

---
 extern/osgQt/include/osgQt/osgQOpenGLWidget.hpp |  2 ++
 extern/osgQt/osgQOpenGLWidget.cpp               | 14 ++++++++++----
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/extern/osgQt/include/osgQt/osgQOpenGLWidget.hpp b/extern/osgQt/include/osgQt/osgQOpenGLWidget.hpp
index 8677b146f8..deb79469e9 100644
--- a/extern/osgQt/include/osgQt/osgQOpenGLWidget.hpp
+++ b/extern/osgQt/include/osgQt/osgQOpenGLWidget.hpp
@@ -63,6 +63,8 @@ protected:
     virtual void setDefaultDisplaySettings();
 
     void createRenderer();
+
+    bool event(QEvent* e) override;
 };
 
 #endif // OSGQOPENGLWIDGET_H
diff --git a/extern/osgQt/osgQOpenGLWidget.cpp b/extern/osgQt/osgQOpenGLWidget.cpp
index 28a510b296..a7de4b8089 100644
--- a/extern/osgQt/osgQOpenGLWidget.cpp
+++ b/extern/osgQt/osgQOpenGLWidget.cpp
@@ -48,10 +48,7 @@ void osgQOpenGLWidget::initializeGL()
 void osgQOpenGLWidget::resizeGL(int w, int h)
 {
     Q_ASSERT(m_renderer);
-    QScreen* screen = windowHandle()
-                      && windowHandle()->screen() ? windowHandle()->screen() :
-                      qApp->screens().front();
-    m_renderer->resize(w * screen->devicePixelRatio(), h * screen->devicePixelRatio());
+    m_renderer->resize(w * devicePixelRatio(), h * devicePixelRatio());
 }
 
 void osgQOpenGLWidget::paintGL()
@@ -94,3 +91,12 @@ void osgQOpenGLWidget::createRenderer()
 
     m_renderer->setupOSG();
 }
+
+bool osgQOpenGLWidget::event(QEvent* e)
+{
+#if QT_VERSION >= QT_VERSION_CHECK(6, 6, 0)
+    if (m_renderer && e->type() == QEvent::DevicePixelRatioChange)
+        m_renderer->resize(width() * devicePixelRatio(), height() * devicePixelRatio());
+#endif
+    return QOpenGLWidget::event(e);
+}
\ No newline at end of file