QNX: Add the ability to disable EGL_KHR_surfaceless_context use

QML fails to draw when this is used on at least one jacinto6 platform.
Works when it's disabled.

Task-number: QTBUG-68227
Change-Id: I7b3c081d4d5a4fe22136f4bdd8ad1f34495cd94a
Reviewed-by: Adam Treat <adam.treat@qt.io>
Reviewed-by: Janne Koskinen <janne.p.koskinen@qt.io>
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>

src/plugins/platforms/qnx/qqnxglcontext.cpp

@@ -38,6 +38,7 @@
 ****************************************************************************/
 
 #include "qqnxglcontext.h"
+#include "qqnxintegration.h"
 #include "qqnxscreen.h"
 #include "qqnxeglwindow.h"
 
@@ -59,8 +60,18 @@ QT_BEGIN_NAMESPACE
 
 EGLDisplay QQnxGLContext::ms_eglDisplay = EGL_NO_DISPLAY;
 
+static QEGLPlatformContext::Flags makeFlags()
+{
+    QEGLPlatformContext::Flags result = 0;
+
+    if (!QQnxIntegration::options().testFlag(QQnxIntegration::SurfacelessEGLContext))
+        result |= QEGLPlatformContext::NoSurfaceless;
+
+    return result;
+}
+
 QQnxGLContext::QQnxGLContext(const QSurfaceFormat &format, QPlatformOpenGLContext *share)
-    : QEGLPlatformContext(format, share, ms_eglDisplay)
+    : QEGLPlatformContext(format, share, ms_eglDisplay, 0, QVariant(), makeFlags())
 {
 }
 

src/plugins/platforms/qnx/qqnxintegration.cpp

@@ -117,6 +117,10 @@ static inline QQnxIntegration::Options parseOptions(const QStringList &paramList
         options |= QQnxIntegration::RootWindow;
     }
 
+    if (!paramList.contains(QLatin1String("disable-EGL_KHR_surfaceless_context"))) {
+        options |= QQnxIntegration::SurfacelessEGLContext;
+    }
+
     return options;
 }
 

src/plugins/platforms/qnx/qqnxintegration.h

@@ -81,7 +81,8 @@ public:
         NoOptions = 0x0,
         FullScreenApplication = 0x1,
         RootWindow = 0x2,
-        AlwaysFlushScreenContext = 0x4
+        AlwaysFlushScreenContext = 0x4,
+        SurfacelessEGLContext = 0x8
     };
     Q_DECLARE_FLAGS(Options, Option)
     explicit QQnxIntegration(const QStringList &paramList);