Move QQnxGLContext::ms_eglDisplay to the integration object

In part, this is a continuation of
https://codereview.qt-project.org/c/qt/qtbase/+/227953.  It also paves
the way toward implementing the EglDisplay integration resource needed
by QtWayland.

For the code that's being moved around and modified, switch from
!QT_NO_OPENGL to QT_CONFIG(opengl).

Change-Id: I5046e8caf5df7cf326f8e697d7d41cf802250414
Reviewed-by: Dan Cape <dcape@qnx.com>
Reviewed-by: Samuli Piippo <samuli.piippo@qt.io>

src/plugins/platforms/qnx/qqnxglcontext.cpp

@@ -58,8 +58,6 @@
 
 QT_BEGIN_NAMESPACE
 
-EGLDisplay QQnxGLContext::ms_eglDisplay = EGL_NO_DISPLAY;
-
 static QEGLPlatformContext::Flags makeFlags()
 {
     QEGLPlatformContext::Flags result = 0;
@@ -71,7 +69,8 @@ static QEGLPlatformContext::Flags makeFlags()
 }
 
 QQnxGLContext::QQnxGLContext(const QSurfaceFormat &format, QPlatformOpenGLContext *share)
-    : QEGLPlatformContext(format, share, ms_eglDisplay, 0, QVariant(), makeFlags())
+    : QEGLPlatformContext(format, share, QQnxIntegration::instance()->eglDisplay(), 0, QVariant(),
+                          makeFlags())
 {
 }
 
@@ -79,28 +78,6 @@ QQnxGLContext::~QQnxGLContext()
 {
 }
 
-void QQnxGLContext::initializeContext()
-{
-    qGLContextDebug();
-
-    // Initialize connection to EGL
-    ms_eglDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
-    if (Q_UNLIKELY(ms_eglDisplay == EGL_NO_DISPLAY))
-        qFatal("QQnxGLContext: failed to obtain EGL display: %x", eglGetError());
-
-    EGLBoolean eglResult = eglInitialize(ms_eglDisplay, 0, 0);
-    if (Q_UNLIKELY(eglResult != EGL_TRUE))
-        qFatal("QQnxGLContext: failed to initialize EGL display, err=%d", eglGetError());
-}
-
-void QQnxGLContext::shutdownContext()
-{
-    qGLContextDebug();
-
-    // Close connection to EGL
-    eglTerminate(ms_eglDisplay);
-}
-
 EGLSurface QQnxGLContext::eglSurfaceForPlatformSurface(QPlatformSurface *surface)
 {
     QQnxEglWindow *window = static_cast<QQnxEglWindow *>(surface);

src/plugins/platforms/qnx/qqnxglcontext.h

@@ -58,19 +58,12 @@ public:
     QQnxGLContext(const QSurfaceFormat &format, QPlatformOpenGLContext *share);
     virtual ~QQnxGLContext();
 
-    static void initializeContext();
-    static void shutdownContext();
-
     bool makeCurrent(QPlatformSurface *surface) override;
     void swapBuffers(QPlatformSurface *surface) override;
     void doneCurrent() override;
 
 protected:
     EGLSurface eglSurfaceForPlatformSurface(QPlatformSurface *surface) override;
-
-private:
-    //Can be static because different displays returne the same handle
-    static EGLDisplay ms_eglDisplay;
 };
 
 QT_END_NAMESPACE

src/plugins/platforms/qnx/qqnxintegration.cpp

@@ -170,6 +170,9 @@ QQnxIntegration::QQnxIntegration(const QStringList &paramList)
 #if QT_CONFIG(draganddrop)
     , m_drag(new QSimpleDrag())
 #endif
+#if QT_CONFIG(opengl)
+    , m_eglDisplay(EGL_NO_DISPLAY)
+#endif
 {
     ms_instance = this;
     m_options = parseOptions(paramList);
@@ -195,9 +198,8 @@ QQnxIntegration::QQnxIntegration(const QStringList &paramList)
     QMetaObject::invokeMethod(m_navigatorEventNotifier, "start", Qt::QueuedConnection);
 #endif
 
-#if !defined(QT_NO_OPENGL)
-    // Initialize global OpenGL resources
-    QQnxGLContext::initializeContext();
+#if QT_CONFIG(opengl)
+    createEglDisplay();
 #endif
 
     // Create/start event thread
@@ -284,9 +286,8 @@ QQnxIntegration::~QQnxIntegration()
     // Close connection to QNX composition manager
     screen_destroy_context(m_screenContext);
 
-#if !defined(QT_NO_OPENGL)
-    // Cleanup global OpenGL resources
-    QQnxGLContext::shutdownContext();
+#if QT_CONFIG(opengl)
+    destroyEglDisplay();
 #endif
 
 #if QT_CONFIG(qqnx_pps)
@@ -741,4 +742,28 @@ bool QQnxIntegration::supportsNavigatorEvents() const
     return m_navigator != 0;
 }
 
+#if QT_CONFIG(opengl)
+void QQnxIntegration::createEglDisplay()
+{
+    qIntegrationDebug();
+
+    // Initialize connection to EGL
+    m_eglDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
+    if (Q_UNLIKELY(m_eglDisplay == EGL_NO_DISPLAY))
+        qFatal("QQnxiIntegration: failed to obtain EGL display: %x", eglGetError());
+
+    EGLBoolean eglResult = eglInitialize(m_eglDisplay, 0, 0);
+    if (Q_UNLIKELY(eglResult != EGL_TRUE))
+        qFatal("QQnxIntegration: failed to initialize EGL display, err=%d", eglGetError());
+}
+
+void QQnxIntegration::destroyEglDisplay()
+{
+    qIntegrationDebug();
+
+    // Close connection to EGL
+    eglTerminate(m_eglDisplay);
+}
+#endif
+
 QT_END_NAMESPACE

src/plugins/platforms/qnx/qqnxintegration.h

@@ -46,6 +46,10 @@
 
 #include <screen/screen.h>
 
+#if QT_CONFIG(opengl)
+#include <EGL/egl.h>
+#endif
+
 QT_BEGIN_NAMESPACE
 
 class QQnxScreenEventThread;
@@ -96,7 +100,8 @@ public:
     QPlatformWindow *createPlatformWindow(QWindow *window) const override;
     QPlatformBackingStore *createPlatformBackingStore(QWindow *window) const override;
 
-#if !defined(QT_NO_OPENGL)
+#if QT_CONFIG(opengl)
+    EGLDisplay eglDisplay() const { return m_eglDisplay; }
     QPlatformOpenGLContext *createPlatformOpenGLContext(QOpenGLContext *context) const override;
 #endif
 
@@ -175,6 +180,12 @@ private:
 
     Options m_options;
 
+#if QT_CONFIG(opengl)
+    EGLDisplay m_eglDisplay;
+    void createEglDisplay();
+    void destroyEglDisplay();
+#endif
+
     static QQnxIntegration *ms_instance;
 
     friend class QQnxWindow;