From 1ef3f4256faabc8a7caa029b1c21ea52bba4879d Mon Sep 17 00:00:00 2001
From: Jeffrey Pfau <jeffrey@endrift.com>
Date: Wed, 15 Oct 2014 02:28:32 -0700
Subject: [PATCH] Fix flickering when resizing emulator window

---
 src/platform/qt/Display.cpp | 7 ++++++-
 src/platform/qt/Display.h   | 2 +-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/platform/qt/Display.cpp b/src/platform/qt/Display.cpp
index 492437dd2..3b477c0e9 100644
--- a/src/platform/qt/Display.cpp
+++ b/src/platform/qt/Display.cpp
@@ -64,7 +64,7 @@ void Display::initializeGL() {
 
 void Display::resizeEvent(QResizeEvent* event) {
 	if (m_painter) {
-		m_painter->resize(event->size());
+		QMetaObject::invokeMethod(m_painter, "resize", Qt::BlockingQueuedConnection, Q_ARG(QSize, event->size()));
 	}
 }
 
@@ -86,6 +86,11 @@ void Painter::setGLContext(QGLWidget* context) {
 
 void Painter::resize(const QSize& size) {
 	m_size = size;
+	m_gl->makeCurrent();
+	glViewport(0, 0, m_size.width() * m_gl->devicePixelRatio(), m_size.height() * m_gl->devicePixelRatio());
+	glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+	m_gl->swapBuffers();
+	m_gl->doneCurrent();
 }
 
 void Painter::start() {
diff --git a/src/platform/qt/Display.h b/src/platform/qt/Display.h
index 6d6d91ed2..2513e4053 100644
--- a/src/platform/qt/Display.h
+++ b/src/platform/qt/Display.h
@@ -39,12 +39,12 @@ public:
 	void setContext(GBAThread*);
 	void setBacking(const uint32_t*);
 	void setGLContext(QGLWidget*);
-	void resize(const QSize& size);
 
 public slots:
 	void draw();
 	void start();
 	void stop();
+	void resize(const QSize& size);
 
 private:
 	QTimer* m_drawTimer;