From ba450ee55430c9f293625aa53fd8e10115c61765 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Du=C5=A1an=20Poizl?= <nou.spiro@gmail.com>
Date: Mon, 25 Apr 2022 12:00:34 +0200
Subject: [PATCH] Error message when OpenGL can't be intialized

---
 imagescrollareagl.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/imagescrollareagl.cpp b/imagescrollareagl.cpp
index 7c7bff1..d27aa71 100644
--- a/imagescrollareagl.cpp
+++ b/imagescrollareagl.cpp
@@ -7,6 +7,8 @@
 #include <QOpenGLFramebufferObject>
 #include <QGridLayout>
 #include <QMimeData>
+#include <QMessageBox>
+#include <QCoreApplication>
 
 struct RawImageType
 {
@@ -62,6 +64,13 @@ ImageWidget::ImageWidget(QWidget *parent) : QOpenGLWidget(parent)
     m_updateTimer->setSingleShot(true);
     connect(m_updateTimer, SIGNAL(timeout()), this, SLOT(update()));
     setAcceptDrops(true);
+    QTimer::singleShot(1000, [this](){
+        if(!isValid())
+        {
+            QMessageBox::critical(this, tr("OpenGL error"), tr("Could not initialize OpenGL 3.3 context. Ensure that proper GPU driver is installed."));
+             QCoreApplication::exit(-1);
+        }
+    });
 }
 
 ImageWidget::~ImageWidget()
@@ -258,6 +267,9 @@ void ImageWidget::initializeGL()
     f->glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
     f3 = context()->versionFunctions<QOpenGLFunctions_3_3_Core>();
 
+    if(f3 == nullptr)
+        QMessageBox::critical(this, tr("OpenGL error"), tr("Could not initialize OpenGL 3.3 context. Ensure that proper GPU driver is installed."));
+
     m_vao = std::unique_ptr<QOpenGLVertexArrayObject>(new QOpenGLVertexArrayObject);
     m_vaoThumb = std::unique_ptr<QOpenGLVertexArrayObject>(new QOpenGLVertexArrayObject);
     m_vao->create();