From bb3bc6e527d95834bd1da769f7ea528cff6aba4b Mon Sep 17 00:00:00 2001
From: Jon Beniston <jon@beniston.com>
Date: Mon, 13 Dec 2021 10:23:05 +0000
Subject: [PATCH] Display OpenGL version in status bar. Displayed in red if
 less than version 3.

---
 app/main.cpp          |  1 +
 sdrgui/mainwindow.cpp | 33 +++++++++++++++++++++++++++++++--
 sdrgui/mainwindow.h   |  1 +
 3 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/app/main.cpp b/app/main.cpp
index 32e1a2f70..943c2a9b7 100644
--- a/app/main.cpp
+++ b/app/main.cpp
@@ -40,6 +40,7 @@ static int runQtApplication(int argc, char* argv[], qtwebapp::LoggerWithFile *lo
 #if QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
 	QApplication::setAttribute(Qt::AA_EnableHighDpiScaling); // DPI support
     QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps); //HiDPI pixmaps
+    QCoreApplication::setAttribute(Qt::AA_ShareOpenGLContexts); // Needed for WebGL in QWebEngineView and MainWindow::openGLVersion
 #endif
 
 	QApplication a(argc, argv);
diff --git a/sdrgui/mainwindow.cpp b/sdrgui/mainwindow.cpp
index 18a4ce2ba..91fe3cf2f 100644
--- a/sdrgui/mainwindow.cpp
+++ b/sdrgui/mainwindow.cpp
@@ -865,14 +865,43 @@ void MainWindow::saveCommandSettings()
 {
 }
 
+QString MainWindow::openGLVersion()
+{
+    QOpenGLContext *glCurrentContext = QOpenGLContext::globalShareContext();
+    if (glCurrentContext)
+    {
+        if (glCurrentContext->isValid())
+        {
+            int major = glCurrentContext->format().majorVersion();
+            int minor = glCurrentContext->format().minorVersion();
+            bool es = glCurrentContext->isOpenGLES();
+            QString version = QString("%1.%2%3").arg(major).arg(minor).arg(es ? " ES" : "");
+            // Waterfall doesn't work if major version is less than 3, so display in red
+            if (major < 3) {
+                version = "<span style=\"color:red\">" + version + "</span>";
+            }
+            return version;
+        }
+        else
+        {
+            return "N/A";
+        }
+    }
+    else
+    {
+        return "N/A";
+    }
+}
+
 void MainWindow::createStatusBar()
 {
     QString qtVersionStr = QString("Qt %1 ").arg(QT_VERSION_STR);
+    QString openGLVersionStr = QString("OpenGL %1 ").arg(openGLVersion());
 #if QT_VERSION >= QT_VERSION_CHECK(5, 4, 0)
-    m_showSystemWidget = new QLabel("SDRangel " + qApp->applicationVersion() + " " + qtVersionStr
+    m_showSystemWidget = new QLabel("SDRangel " + qApp->applicationVersion() + " " + qtVersionStr + openGLVersionStr
             + QSysInfo::currentCpuArchitecture() + " " + QSysInfo::prettyProductName(), this);
 #else
-    m_showSystemWidget = new QLabel("SDRangel " + qApp->applicationVersion() + " " + qtVersionStr, this);
+    m_showSystemWidget = new QLabel("SDRangel " + qApp->applicationVersion() + " " + qtVersionStr + openGLVersionStr, this);
 #endif
     statusBar()->addPermanentWidget(m_showSystemWidget);
 
diff --git a/sdrgui/mainwindow.h b/sdrgui/mainwindow.h
index 725d6a147..a0ca9bc6c 100644
--- a/sdrgui/mainwindow.h
+++ b/sdrgui/mainwindow.h
@@ -129,6 +129,7 @@ private:
 	void saveFeatureSetPresetSettings(FeatureSetPreset* preset, int featureSetIndex);
 	void saveCommandSettings();
 
+	QString openGLVersion();
 	void createStatusBar();
 	void closeEvent(QCloseEvent*);
 	void updatePresetControls();