qmlscene: Add option --verbose to obtain diagnostic output.

Print the build information and connect to
QQuickWindow::openglContextCreated() to print information on the
GL driver (similar to qtdiag).
Set a window title indicating render type and Qt version.

Task-number: QTBUG-46030
Change-Id: Ib4376126bf9c63f4cab8cb530ff1da66394b634b
Reviewed-by: Alan Alpert <aalpert@blackberry.com>

1 files changed, 63 insertions, 2 deletions

diff --git a/tools/qmlscene/main.cpp b/tools/qmlscene/main.cpp
index ad57454651..fe01b92244 100644
--- a/tools/qmlscene/main.cpp
+++ b/tools/qmlscene/main.cpp
@@ -40,6 +40,7 @@
 #include <QtCore/qtextstream.h>
 
 #include <QtGui/QGuiApplication>
+#include <QtGui/QOpenGLFunctions>
 
 #include <QtQml/qqml.h>
 #include <QtQml/qqmlengine.h>
@@ -148,6 +149,7 @@ struct Options
         , quitImmediately(false)
         , resizeViewToRootItem(false)
         , multisample(false)
+        , verbose(false)
     {
         // QtWebEngine needs a shared context in order for the GPU thread to
         // upload textures.
@@ -166,6 +168,7 @@ struct Options
     bool quitImmediately;
     bool resizeViewToRootItem;
     bool multisample;
+    bool verbose;
     QVector<Qt::ApplicationAttribute> applicationAttributes;
     QString translationFile;
 };
@@ -355,6 +358,7 @@ static void usage()
     puts("  --desktop..........................Force use of desktop GL (AA_UseDesktopOpenGL)");
     puts("  --gles.............................Force use of GLES (AA_UseOpenGLES)");
     puts("  --software.........................Force use of software rendering (AA_UseOpenGLES)");
+    puts("  --verbose..........................Print version and graphical diagnostics for the run-time");
     puts("  -I <path> ........................ Add <path> to the list of import paths");
     puts("  -P <path> ........................ Add <path> to the list of plugin paths");
     puts("  -translation <translationfile> ... Set the language to run in");
@@ -363,6 +367,55 @@ static void usage()
     exit(1);
 }
 
+// Listen on GL context creation of the QQuickWindow in order to print diagnostic output.
+class DiagnosticGlContextCreationListener : public QObject {
+    Q_OBJECT
+public:
+    explicit DiagnosticGlContextCreationListener(QQuickWindow *window) : QObject(window)
+    {
+        connect(window, &QQuickWindow::openglContextCreated,
+                this, &DiagnosticGlContextCreationListener::onOpenGlContextCreated);
+    }
+
+private slots:
+    void onOpenGlContextCreated(QOpenGLContext *context)
+    {
+        context->makeCurrent(qobject_cast<QQuickWindow *>(parent()));
+        QOpenGLFunctions functions(context);
+        QByteArray output = "Vendor  : ";
+        output += reinterpret_cast<const char *>(functions.glGetString(GL_VENDOR));
+        output += "\nRenderer: ";
+        output += reinterpret_cast<const char *>(functions.glGetString(GL_RENDERER));
+        output += "\nVersion : ";
+        output += reinterpret_cast<const char *>(functions.glGetString(GL_VERSION));
+        output += "\nLanguage: ";
+        output += reinterpret_cast<const char *>(functions.glGetString(GL_SHADING_LANGUAGE_VERSION));
+        puts(output.constData());
+        context->doneCurrent();
+        deleteLater();
+    }
+};
+
+static void setWindowTitle(bool verbose, const QObject *topLevel, QWindow *window)
+{
+    const QString oldTitle = window->title();
+    QString newTitle = oldTitle;
+    if (newTitle.isEmpty()) {
+        newTitle = QLatin1String("qmlscene");
+        if (!qobject_cast<const QWindow *>(topLevel) && !topLevel->objectName().isEmpty())
+            newTitle += QLatin1String(": ") + topLevel->objectName();
+    }
+    if (verbose) {
+        newTitle += QLatin1String(" [Qt ") + QLatin1String(QT_VERSION_STR) + QLatin1Char(' ')
+            + QGuiApplication::platformName() + QLatin1Char(' ');
+        newTitle += QOpenGLContext::openGLModuleType() == QOpenGLContext::LibGL
+            ? QLatin1String("GL") : QLatin1String("GLES");
+        newTitle += QLatin1Char(']');
+    }
+    if (oldTitle != newTitle)
+        window->setTitle(newTitle);
+}
+
 int main(int argc, char ** argv)
 {
     Options options;
@@ -402,6 +455,8 @@ int main(int argc, char ** argv)
                 options.applicationAttributes.append(Qt::AA_UseSoftwareOpenGL);
             else if (lowerArgument == QLatin1String("--desktop"))
                 options.applicationAttributes.append(Qt::AA_UseDesktopOpenGL);
+            else if (lowerArgument == QLatin1String("--verbose"))
+                options.verbose = true;
             else if (lowerArgument == QLatin1String("-i") && i + 1 < argc)
                 imports.append(QString::fromLatin1(argv[++i]));
             else if (lowerArgument == QLatin1String("-p") && i + 1 < argc)
@@ -456,6 +511,9 @@ int main(int argc, char ** argv)
 
     int exitCode = 0;
 
+    if (options.verbose)
+        puts(QLibraryInfo::build());
+
     if (!options.file.isEmpty()) {
         if (!options.versionDetection || checkVersion(options.file)) {
 #ifndef QT_NO_TRANSLATION
@@ -498,8 +556,6 @@ int main(int argc, char ** argv)
                     QQuickView* qxView = new QQuickView(&engine, NULL);
                     window.reset(qxView);
                     // Set window default properties; the qml can still override them
-                    QString oname = contentItem->objectName();
-                    window->setTitle(oname.isEmpty() ? QString::fromLatin1("qmlscene") : QString::fromLatin1("qmlscene: ") + oname);
                     if (options.resizeViewToRootItem)
                         qxView->setResizeMode(QQuickView::SizeViewToRootObject);
                     else
@@ -509,6 +565,9 @@ int main(int argc, char ** argv)
             }
 
             if (window) {
+                setWindowTitle(options.verbose, topLevel, window.data());
+                if (options.verbose)
+                    new DiagnosticGlContextCreationListener(window.data());
                 QSurfaceFormat surfaceFormat = window->requestedFormat();
                 if (options.multisample)
                     surfaceFormat.setSamples(16);
@@ -550,3 +609,5 @@ int main(int argc, char ** argv)
 
     return exitCode;
 }
+
+#include "main.moc"